fork from github

Gemfile

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+source "https://rubygems.org"
+
+gem "fastlane"
+

Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    CFPropertyList (3.0.3)
+    addressable (2.8.0)
+      public_suffix (>= 2.0.2, < 5.0)
+    artifactory (3.0.15)
+    atomos (0.1.3)
+    aws-eventstream (1.2.0)
+    aws-partitions (1.494.0)
+    aws-sdk-core (3.120.0)
+      aws-eventstream (~> 1, >= 1.0.2)
+      aws-partitions (~> 1, >= 1.239.0)
+      aws-sigv4 (~> 1.1)
+      jmespath (~> 1.0)
+    aws-sdk-kms (1.48.0)
+      aws-sdk-core (~> 3, >= 3.120.0)
+      aws-sigv4 (~> 1.1)
+    aws-sdk-s3 (1.101.0)
+      aws-sdk-core (~> 3, >= 3.120.0)
+      aws-sdk-kms (~> 1)
+      aws-sigv4 (~> 1.1)
+    aws-sigv4 (1.3.0)
+      aws-eventstream (~> 1, >= 1.0.2)
+    babosa (1.0.4)
+    claide (1.0.3)
+    colored (1.2)
+    colored2 (3.1.2)
+    commander (4.6.0)
+      highline (~> 2.0.0)
+    declarative (0.0.20)
+    digest-crc (0.6.4)
+      rake (>= 12.0.0, < 14.0.0)
+    domain_name (0.5.20190701)
+      unf (>= 0.0.5, < 1.0.0)
+    dotenv (2.7.6)
+    emoji_regex (3.2.2)
+    excon (0.85.0)
+    faraday (1.7.1)
+      faraday-em_http (~> 1.0)
+      faraday-em_synchrony (~> 1.0)
+      faraday-excon (~> 1.1)
+      faraday-httpclient (~> 1.0.1)
+      faraday-net_http (~> 1.0)
+      faraday-net_http_persistent (~> 1.1)
+      faraday-patron (~> 1.0)
+      faraday-rack (~> 1.0)
+      multipart-post (>= 1.2, < 3)
+      ruby2_keywords (>= 0.0.4)
+    faraday-cookie_jar (0.0.7)
+      faraday (>= 0.8.0)
+      http-cookie (~> 1.0.0)
+    faraday-em_http (1.0.0)
+    faraday-em_synchrony (1.0.0)
+    faraday-excon (1.1.0)
+    faraday-httpclient (1.0.1)
+    faraday-net_http (1.0.1)
+    faraday-net_http_persistent (1.2.0)
+    faraday-patron (1.0.0)
+    faraday-rack (1.0.0)
+    faraday_middleware (1.1.0)
+      faraday (~> 1.0)
+    fastimage (2.2.5)
+    fastlane (2.193.0)
+      CFPropertyList (>= 2.3, < 4.0.0)
+      addressable (>= 2.8, < 3.0.0)
+      artifactory (~> 3.0)
+      aws-sdk-s3 (~> 1.0)
+      babosa (>= 1.0.3, < 2.0.0)
+      bundler (>= 1.12.0, < 3.0.0)
+      colored
+      commander (~> 4.6)
+      dotenv (>= 2.1.1, < 3.0.0)
+      emoji_regex (>= 0.1, < 4.0)
+      excon (>= 0.71.0, < 1.0.0)
+      faraday (~> 1.0)
+      faraday-cookie_jar (~> 0.0.6)
+      faraday_middleware (~> 1.0)
+      fastimage (>= 2.1.0, < 3.0.0)
+      gh_inspector (>= 1.1.2, < 2.0.0)
+      google-apis-androidpublisher_v3 (~> 0.3)
+      google-apis-playcustomapp_v1 (~> 0.1)
+      google-cloud-storage (~> 1.31)
+      highline (~> 2.0)
+      json (< 3.0.0)
+      jwt (>= 2.1.0, < 3)
+      mini_magick (>= 4.9.4, < 5.0.0)
+      multipart-post (~> 2.0.0)
+      naturally (~> 2.2)
+      optparse (~> 0.1.1)
+      plist (>= 3.1.0, < 4.0.0)
+      rubyzip (>= 2.0.0, < 3.0.0)
+      security (= 0.1.3)
+      simctl (~> 1.6.3)
+      terminal-notifier (>= 2.0.0, < 3.0.0)
+      terminal-table (>= 1.4.5, < 2.0.0)
+      tty-screen (>= 0.6.3, < 1.0.0)
+      tty-spinner (>= 0.8.0, < 1.0.0)
+      word_wrap (~> 1.0.0)
+      xcodeproj (>= 1.13.0, < 2.0.0)
+      xcpretty (~> 0.3.0)
+      xcpretty-travis-formatter (>= 0.0.3)
+    gh_inspector (1.1.3)
+    google-apis-androidpublisher_v3 (0.10.0)
+      google-apis-core (>= 0.4, < 2.a)
+    google-apis-core (0.4.1)
+      addressable (~> 2.5, >= 2.5.1)
+      googleauth (>= 0.16.2, < 2.a)
+      httpclient (>= 2.8.1, < 3.a)
+      mini_mime (~> 1.0)
+      representable (~> 3.0)
+      retriable (>= 2.0, < 4.a)
+      rexml
+      webrick
+    google-apis-iamcredentials_v1 (0.7.0)
+      google-apis-core (>= 0.4, < 2.a)
+    google-apis-playcustomapp_v1 (0.5.0)
+      google-apis-core (>= 0.4, < 2.a)
+    google-apis-storage_v1 (0.6.0)
+      google-apis-core (>= 0.4, < 2.a)
+    google-cloud-core (1.6.0)
+      google-cloud-env (~> 1.0)
+      google-cloud-errors (~> 1.0)
+    google-cloud-env (1.5.0)
+      faraday (>= 0.17.3, < 2.0)
+    google-cloud-errors (1.1.0)
+    google-cloud-storage (1.34.1)
+      addressable (~> 2.5)
+      digest-crc (~> 0.4)
+      google-apis-iamcredentials_v1 (~> 0.1)
+      google-apis-storage_v1 (~> 0.1)
+      google-cloud-core (~> 1.6)
+      googleauth (>= 0.16.2, < 2.a)
+      mini_mime (~> 1.0)
+    googleauth (0.17.1)
+      faraday (>= 0.17.3, < 2.0)
+      jwt (>= 1.4, < 3.0)
+      memoist (~> 0.16)
+      multi_json (~> 1.11)
+      os (>= 0.9, < 2.0)
+      signet (~> 0.15)
+    highline (2.0.3)
+    http-cookie (1.0.4)
+      domain_name (~> 0.5)
+    httpclient (2.8.3)
+    jmespath (1.4.0)
+    json (2.5.1)
+    jwt (2.2.3)
+    memoist (0.16.2)
+    mini_magick (4.11.0)
+    mini_mime (1.1.1)
+    multi_json (1.15.0)
+    multipart-post (2.0.0)
+    nanaimo (0.3.0)
+    naturally (2.2.1)
+    optparse (0.1.1)
+    os (1.1.1)
+    plist (3.6.0)
+    public_suffix (4.0.6)
+    rake (13.0.6)
+    representable (3.1.1)
+      declarative (< 0.1.0)
+      trailblazer-option (>= 0.1.1, < 0.2.0)
+      uber (< 0.2.0)
+    retriable (3.1.2)
+    rexml (3.2.5)
+    rouge (2.0.7)
+    ruby2_keywords (0.0.5)
+    rubyzip (2.3.2)
+    security (0.1.3)
+    signet (0.15.0)
+      addressable (~> 2.3)
+      faraday (>= 0.17.3, < 2.0)
+      jwt (>= 1.5, < 3.0)
+      multi_json (~> 1.10)
+    simctl (1.6.8)
+      CFPropertyList
+      naturally
+    terminal-notifier (2.0.0)
+    terminal-table (1.8.0)
+      unicode-display_width (~> 1.1, >= 1.1.1)
+    trailblazer-option (0.1.1)
+    tty-cursor (0.7.1)
+    tty-screen (0.8.1)
+    tty-spinner (0.9.3)
+      tty-cursor (~> 0.7)
+    uber (0.1.0)
+    unf (0.1.4)
+      unf_ext
+    unf_ext (0.0.7.7)
+    unicode-display_width (1.7.0)
+    webrick (1.7.0)
+    word_wrap (1.0.0)
+    xcodeproj (1.21.0)
+      CFPropertyList (>= 2.3.3, < 4.0)
+      atomos (~> 0.1.3)
+      claide (>= 1.0.2, < 2.0)
+      colored2 (~> 3.1)
+      nanaimo (~> 0.3.0)
+      rexml (~> 3.2.4)
+    xcpretty (0.3.0)
+      rouge (~> 2.0.7)
+    xcpretty-travis-formatter (1.0.1)
+      xcpretty (~> 0.2, >= 0.0.7)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  fastlane
+
+BUNDLED WITH
+   2.1.4

LICENSE

@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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+
+  11. Patents.
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+  A contributor's "essential patent claims" are all patent claims
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+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
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+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
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+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
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+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

README.md

@@ -0,0 +1,44 @@
+# ![Feature graphic](fastlane/metadata/android/en-US/images/featureGraphic.png)
+
+[![Latest release](https://img.shields.io/github/tag-date/ashutoshgngwr/noice.svg?color=orange&label=release)](https://GitHub.com/ashutoshgngwr/noice/tags/)
+[![GitHub license](https://img.shields.io/github/license/ashutoshgngwr/noice.svg)](https://github.com/ashutoshgngwr/noice/blob/master/LICENSE)
+[![Translation status](https://hosted.weblate.org/widgets/noice/-/svg-badge.svg)](https://hosted.weblate.org/engage/noice/)
+[![Financial contributors](https://opencollective.com/noice/tiers/badge.svg)](https://opencollective.com/noice)
+[![Android](https://github.com/ashutoshgngwr/noice/workflows/Android/badge.svg)](https://github.com/ashutoshgngwr/noice/actions?query=workflow%3AAndroid)
+[![Cast Receiver](https://github.com/ashutoshgngwr/noice/workflows/Cast%20Receiver/badge.svg)](https://github.com/ashutoshgngwr/noice/actions?query=workflow%3A%22Cast+Receiver%22)
+[![codecov](https://codecov.io/gh/ashutoshgngwr/noice/branch/master/graph/badge.svg)](https://codecov.io/gh/ashutoshgngwr/noice)
+[![Codacy Badge](https://api.codacy.com/project/badge/Grade/67635a43989c4dbcb6c3472375dc1e5f)](https://www.codacy.com/manual/ashutoshgngwr/noice)
+
+For a lot of people, a little background noise is helpful to calm down and focus. In some cases, it's also a boost to productivity. Background noise can also help minimize the effects of stress.
+
+Noice is an app that allows you to create your own set of background sounds by mixing clips from environmental sources. Create your perfect surroundings by combining different sounds to drown out distractions so you can focus on your work, or generate serene, peaceful environments that encourage you to fall asleep.
+
+## Download
+
+[<img src="https://fdroid.gitlab.io/artwork/badge/get-it-on.png" alt="Get it on F-Droid" height="100">][f-droid-link]
+[<img src="https://play.google.com/intl/en_us/badges/images/generic/en-play-badge.png" alt="Get it on Google Play" height="100">][google-play-link]
+
+## Screenshots
+
+|                                                                                |                                                                                |                                                                                |
+| ------------------------------------------------------------------------------ | ------------------------------------------------------------------------------ | ------------------------------------------------------------------------------ |
+| ![Screenshot 1](fastlane/metadata/android/en-US/images/phoneScreenshots/1.png) | ![Screenshot 2](fastlane/metadata/android/en-US/images/phoneScreenshots/2.png) | ![Screenshot 3](fastlane/metadata/android/en-US/images/phoneScreenshots/3.png) |
+| ![Screenshot 4](fastlane/metadata/android/en-US/images/phoneScreenshots/4.png) | ![Screenshot 5](fastlane/metadata/android/en-US/images/phoneScreenshots/5.png) | ![Screenshot 6](fastlane/metadata/android/en-US/images/phoneScreenshots/6.png) |
+
+## Documentation
+
+1. [All notable changes](https://ashutoshgngwr.github.io/noice/CHANGELOG) to the
+   project over time
+2. The [list of
+   contributors](https://ashutoshgngwr.github.io/noice/contributors)
+3. [How can you contribute?](https://ashutoshgngwr.github.io/noice/contributing)
+4. [Code of Conduct](https://ashutoshgngwr.github.io/noice/code-of-conduct)
+5. [Privacy Policy](https://ashutoshgngwr.github.io/noice/privacy-policy) for
+   application users
+
+## License
+
+[GNU GPL v3](LICENSE)
+
+[google-play-link]: https://play.google.com/store/apps/details?id=com.github.ashutoshgngwr.noice&referrer=utm_source%3DGitHub%26utm_campaign%3DREADME
+[f-droid-link]: https://f-droid.org/app/com.github.ashutoshgngwr.noice

app/build.gradle

@@ -0,0 +1,148 @@
+plugins {
+  id 'com.android.application'
+  id 'kotlin-android'
+
+
+  id 'com.adarshr.test-logger' version '3.0.0'
+}
+
+apply from: 'jacoco.gradle'
+
+android {
+  compileSdkVersion 30
+
+  defaultConfig {
+    applicationId 'com.github.ashutoshgngwr.noice'
+    minSdkVersion 21
+    targetSdkVersion 30
+    versionCode 52
+    versionName '1.3.3'
+    testInstrumentationRunner 'androidx.test.runner.AndroidJUnitRunner'
+  }
+
+
+  buildFeatures {
+    viewBinding true
+  }
+
+  buildTypes {
+    debug {
+      applicationIdSuffix '.debug'
+      testCoverageEnabled true
+    }
+
+    release {
+      shrinkResources true
+      minifyEnabled true
+      proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+    }
+  }
+
+  flavorDimensions 'tier'
+  productFlavors {
+    free {
+      dimension 'tier'
+      buildConfigField 'boolean', 'IS_FREE_BUILD', 'true'
+    }
+
+    full {
+      dimension 'tier'
+      buildConfigField 'boolean', 'IS_FREE_BUILD', 'false'
+    }
+  }
+
+  compileOptions {
+    sourceCompatibility = JavaVersion.VERSION_1_8
+    targetCompatibility = JavaVersion.VERSION_1_8
+  }
+
+  kotlinOptions {
+    useIR = true
+    jvmTarget = 1.8
+    freeCompilerArgs += ["-Xopt-in=kotlinx.coroutines.ExperimentalCoroutinesApi"]
+  }
+
+  testOptions {
+    unitTests {
+      includeAndroidResources = true
+      all {
+        testlogger {
+          theme 'mocha'
+        }
+      }
+    }
+  }
+}
+
+dependencies {
+  def fragmentVersion = '1.3.6'
+  def testCoreVersion = '1.3.0'
+  def junitVersion = '4.13.2'
+  def mockkVersion = '1.12.0'
+  def espressoVersion = '3.3.0'
+  def coroutinesVersion = '1.5.2'
+
+  // TODO: move this to stable release. The latest stable release (2.3.5) causes a crash with error
+  //  `java.lang.RuntimeException: Unknown animation name: x`
+  //  Although, the crash only occurs on the Play Store variant..?
+  def navVersion = '2.4.0-alpha06'
+
+  implementation 'androidx.activity:activity-ktx:1.3.1'
+  implementation 'androidx.appcompat:appcompat:1.3.1'
+  implementation 'androidx.browser:browser:1.3.0'
+  implementation 'androidx.cardview:cardview:1.0.0'
+  implementation 'androidx.constraintlayout:constraintlayout:2.1.0'
+  implementation 'androidx.core:core-ktx:1.6.0'
+  implementation 'androidx.drawerlayout:drawerlayout:1.1.1'
+  implementation "androidx.fragment:fragment-ktx:$fragmentVersion"
+  implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.3.1'
+  implementation 'androidx.media:media:1.4.1'
+  implementation 'androidx.mediarouter:mediarouter:1.2.5'
+  implementation "androidx.navigation:navigation-fragment-ktx:$navVersion"
+  implementation "androidx.navigation:navigation-ui-ktx:$navVersion"
+  implementation 'androidx.preference:preference-ktx:1.1.1'
+  implementation 'androidx.recyclerview:recyclerview:1.2.1'
+  implementation 'com.github.AppIntro:AppIntro:6.1.0'
+  implementation 'io.github.medyo:android-about-page:2.0.0'
+  implementation 'com.google.android.exoplayer:exoplayer-core:2.11.8'
+  implementation 'com.google.android:flexbox:2.0.1'
+  implementation 'com.google.android.material:material:1.4.0'
+  implementation 'com.google.code.gson:gson:2.8.8'
+  implementation 'com.hopenlib.library:flextools:1.0.1'
+  implementation 'com.ncorti:slidetoact:0.9.0'
+  implementation 'io.noties.markwon:core:4.6.2'
+  implementation 'org.greenrobot:eventbus:3.1.1'
+  implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
+
+  fullImplementation 'com.android.billingclient:billing-ktx:4.0.0'
+  fullImplementation 'com.google.android.gms:play-services-base:17.6.0'
+  fullImplementation 'com.google.android.gms:play-services-cast-framework:20.0.0'
+  fullImplementation 'com.google.android.play:core:1.10.1'
+  fullImplementation platform('com.google.firebase:firebase-bom:28.4.0')
+  fullImplementation 'com.google.firebase:firebase-analytics-ktx'
+  fullImplementation 'com.google.firebase:firebase-crashlytics-ktx'
+  fullImplementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:$coroutinesVersion"
+
+
+  testImplementation "androidx.test:core:$testCoreVersion"
+  testImplementation "io.mockk:mockk:$mockkVersion"
+  testImplementation "junit:junit:$junitVersion"
+  testImplementation 'org.robolectric:robolectric:4.5.1'
+  testImplementation 'org.skyscreamer:jsonassert:1.5.0'
+
+  testFullImplementation "org.jetbrains.kotlinx:kotlinx-coroutines-test:$coroutinesVersion"
+
+  androidTestImplementation "androidx.test:core:$testCoreVersion"
+  androidTestImplementation "androidx.test:rules:1.4.0"
+  androidTestImplementation "androidx.test:runner:1.4.0"
+  androidTestImplementation "androidx.test.espresso:espresso-core:$espressoVersion"
+  androidTestImplementation "androidx.test.espresso:espresso-contrib:$espressoVersion"
+  androidTestImplementation "androidx.test.espresso:espresso-intents:$espressoVersion"
+  androidTestImplementation 'androidx.test.ext:junit:1.1.3'
+  androidTestImplementation "io.mockk:mockk-android:$mockkVersion"
+  androidTestImplementation "junit:junit:$junitVersion"
+
+  androidTestFullImplementation 'tools.fastlane:screengrab:2.1.0'
+
+  debugImplementation "androidx.fragment:fragment-testing:$fragmentVersion"
+}

app/google-services.json

@@ -0,0 +1,68 @@
+{
+  "project_info": {
+    "project_number": "988644359741",
+    "project_id": "noice-android",
+    "storage_bucket": "noice-android.appspot.com"
+  },
+  "client": [
+    {
+      "client_info": {
+        "mobilesdk_app_id": "1:988644359741:android:5f9097fe9d7b6944a63454",
+        "android_client_info": {
+          "package_name": "com.github.ashutoshgngwr.noice"
+        }
+      },
+      "oauth_client": [
+        {
+          "client_id": "988644359741-6avtf2r8i748vfrhnndbedbc0l7b0677.apps.googleusercontent.com",
+          "client_type": 3
+        }
+      ],
+      "api_key": [
+        {
+          "current_key": "AIzaSyD0bJzJla8JZSyAXe3AqzxQ7z0i0gCTurI"
+        }
+      ],
+      "services": {
+        "appinvite_service": {
+          "other_platform_oauth_client": [
+            {
+              "client_id": "988644359741-6avtf2r8i748vfrhnndbedbc0l7b0677.apps.googleusercontent.com",
+              "client_type": 3
+            }
+          ]
+        }
+      }
+    },
+    {
+      "client_info": {
+        "mobilesdk_app_id": "1:988644359741:android:1307df0db8c918c9a63454",
+        "android_client_info": {
+          "package_name": "com.github.ashutoshgngwr.noice.debug"
+        }
+      },
+      "oauth_client": [
+        {
+          "client_id": "988644359741-6avtf2r8i748vfrhnndbedbc0l7b0677.apps.googleusercontent.com",
+          "client_type": 3
+        }
+      ],
+      "api_key": [
+        {
+          "current_key": "AIzaSyD0bJzJla8JZSyAXe3AqzxQ7z0i0gCTurI"
+        }
+      ],
+      "services": {
+        "appinvite_service": {
+          "other_platform_oauth_client": [
+            {
+              "client_id": "988644359741-6avtf2r8i748vfrhnndbedbc0l7b0677.apps.googleusercontent.com",
+              "client_type": 3
+            }
+          ]
+        }
+      }
+    }
+  ],
+  "configuration_version": "1"
+}

app/jacoco.gradle

@@ -0,0 +1,62 @@
+// https://github.com/dampcake/Robolectric-JaCoCo-Sample/blob/master/jacoco.gradle
+
+apply plugin: 'jacoco'
+
+jacoco {
+  // https://bintray.com/bintray/jcenter/org.jacoco:org.jacoco.core
+  toolVersion = '0.8.7'
+}
+
+android {
+  testOptions {
+    unitTests.all {
+      jacoco {
+        includeNoLocationClasses = true
+        excludes = ['jdk.internal.*']
+      }
+    }
+  }
+}
+
+project.afterEvaluate {
+
+  android.applicationVariants.all { variant ->
+    def taskName = "test${variant.name.capitalize()}Coverage"
+    def testTask = "test${variant.name.capitalize()}UnitTest"
+    tasks.create(name: "${taskName}", type: JacocoReport, dependsOn: "${testTask}") {
+      group = 'Reporting'
+      description = "Generate Jacoco coverage reports for the ${variant.name} build variant."
+
+      def sourceDirs = ['src/main/java'] + android.sourceSets[variant.name].java.srcDirs
+      def execDataFile = "${project.buildDir}/jacoco/${testTask}.exec"
+      def classFiles = fileTree(
+        dir: "${project.buildDir}/tmp/kotlin-classes/${variant.name}",
+        excludes: ['**/R.class',
+                   '**/R$*.class',
+                   '**/*$ViewInjector*.*',
+                   '**/*$ViewBinder*.*',
+                   '**/BuildConfig.*',
+                   '**/Manifest*.*']
+      )
+
+      sourceDirectories.setFrom(files(sourceDirs))
+      executionData.setFrom(files(execDataFile))
+      classDirectories.setFrom(classFiles)
+
+      reports {
+        xml.enabled = true
+        xml.destination file("${project.buildDir}/reports/jacoco/${taskName}/report.xml")
+        html.enabled = true
+      }
+    }
+  }
+
+  tasks.create(name: 'testCoverage', type: JacocoReport) {
+    group = 'Reporting'
+    description = 'Generate Jacoco coverage reports for the all build variants.'
+
+    android.applicationVariants.all { variant ->
+      dependsOn "test${variant.name.capitalize()}Coverage"
+    }
+  }
+}

app/local.properties

@@ -0,0 +1,2 @@
+sdk.dir=/opt/android-sdk
+sdk-location=/opt/android-sdk

app/proguard-rules.pro

@@ -0,0 +1,37 @@
+# crashlytics
+-keepattributes SourceFile,LineNumberTable
+-keep public class * extends java.lang.Exception
+
+# EventBus rules
+-keepattributes *Annotation*
+-keepclassmembers class * {
+    @org.greenrobot.eventbus.Subscribe <methods>;
+}
+
+-keep enum org.greenrobot.eventbus.ThreadMode { *; }
+
+# GSON rules https://github.com/google/gson/blob/master/examples/android-proguard-example/proguard.cfg
+# Gson uses generic type information stored in a class file when working with fields. Proguard
+# removes such information by default, so configure it to keep all of it.
+-keepattributes Signature
+
+# For using GSON @Expose annotation, already present in EventBus rules
+-keepattributes *Annotation*
+
+# Gson specific classes
+-dontwarn sun.misc.**
+
+# Prevent proguard from stripping interface information from TypeAdapter, TypeAdapterFactory,
+# JsonSerializer, JsonDeserializer instances (so they can be used in @JsonAdapter)
+-keep class * implements com.google.gson.TypeAdapter
+-keep class * implements com.google.gson.TypeAdapterFactory
+-keep class * implements com.google.gson.JsonSerializer
+-keep class * implements com.google.gson.JsonDeserializer
+
+# Since we only serialise/deserialise @Expose fields in Noice, keep all will with members annotated as such.
+-keepclassmembers class * {
+  @com.google.gson.annotations.Expose <fields>;
+}
+
+# Preserve names of all fragment classes for analytics
+-keepnames class com.github.ashutoshgngwr.noice.fragment.*

app/src/androidTest/java/com/github/ashutoshgngwr/noice/EspressoX.kt

@@ -0,0 +1,152 @@
+package com.github.ashutoshgngwr.noice
+
+import android.content.Intent
+import android.view.View
+import androidx.annotation.IdRes
+import androidx.annotation.StringRes
+import androidx.test.espresso.Espresso.onView
+import androidx.test.espresso.UiController
+import androidx.test.espresso.ViewAction
+import androidx.test.espresso.ViewInteraction
+import androidx.test.espresso.action.MotionEvents
+import androidx.test.espresso.intent.matcher.IntentMatchers.hasAction
+import androidx.test.espresso.intent.matcher.IntentMatchers.hasExtra
+import androidx.test.espresso.matcher.RootMatchers.isDialog
+import androidx.test.espresso.matcher.ViewMatchers.*
+import com.github.ashutoshgngwr.noice.widget.DurationPicker
+import com.google.android.material.bottomnavigation.BottomNavigationView
+import com.google.android.material.slider.Slider
+import com.google.android.material.textfield.TextInputLayout
+import org.hamcrest.Description
+import org.hamcrest.Matcher
+import org.hamcrest.Matchers.*
+import org.hamcrest.TypeSafeMatcher
+
+
+/**
+ * [EspressoX] contains the custom extended util implementations for Espresso.
+ */
+object EspressoX {
+
+  /**
+   * [clickInItem] performs a click action on item with the given [viewId] inside currently
+   * matched view.
+   */
+  fun clickInItem(@IdRes viewId: Int): ViewAction {
+    return object : ViewAction {
+      override fun getDescription() = "Click on view with specified id"
+      override fun getConstraints() = hasDescendant(withId(viewId))
+
+      override fun perform(uiController: UiController, view: View) {
+        view.findViewById<View>(viewId).also { it.performClick() }
+      }
+    }
+  }
+
+  /**
+   * [slide] emulates slide action on the provided [Slider] widget.
+   */
+  fun slide(value: Float): ViewAction {
+    return object : ViewAction {
+      override fun getDescription() = "Emulate user input on a slider"
+      override fun getConstraints() = instanceOf<View>(Slider::class.java)
+
+      override fun perform(uiController: UiController, view: View) {
+        view as Slider
+        val height = view.height - view.paddingTop - view.paddingBottom
+        val location = intArrayOf(0, 0)
+        view.getLocationOnScreen(location)
+
+        val xOffset = location[0].toFloat() + view.paddingStart + view.trackSidePadding
+        val range = view.valueTo - view.valueFrom
+        val xStart = (((view.value - view.valueFrom) / range) * view.trackWidth) + xOffset
+
+        val x = (((value - view.valueFrom) / range) * view.trackWidth) + xOffset
+        val y = location[1] + view.paddingTop + (height.toFloat() / 2)
+
+        val startCoordinates = floatArrayOf(xStart, y)
+        val endCoordinates = floatArrayOf(x, y)
+        val precision = floatArrayOf(1f, 1f)
+
+        // Send down event, and send up
+        val down = MotionEvents.sendDown(uiController, startCoordinates, precision).down
+        uiController.loopMainThreadForAtLeast(100)
+        MotionEvents.sendMovement(uiController, down, endCoordinates)
+        uiController.loopMainThreadForAtLeast(100)
+        MotionEvents.sendUp(uiController, down, endCoordinates)
+      }
+    }
+  }
+
+  /**
+   * Returns a [ViewAction] that invokes [DurationPicker.onDurationAddedListener] with the given
+   * [durationSecs].
+   */
+  fun addDurationToPicker(durationSecs: Long): ViewAction {
+    return object : ViewAction {
+      override fun getDescription() = "add duration to a DurationPicker"
+      override fun getConstraints() = instanceOf<View>(DurationPicker::class.java)
+
+      override fun perform(uiController: UiController, view: View) {
+        view as DurationPicker
+        view.invokeOnDurationAddedListener(durationSecs * 1000L)
+      }
+    }
+  }
+
+  /**
+   * Returns a [Matcher] that matches reset button of the [DurationPicker] view.
+   */
+  fun withDurationPickerResetButton(durationPickerMatcher: Matcher<View>): Matcher<View> {
+    return allOf(isDescendantOfA(durationPickerMatcher), withId(R.id.reset_button))
+  }
+
+  /**
+   * [withErrorText] matches [TextInputLayout]s using the provided error text.
+   */
+  fun withErrorText(@StringRes expectedErrorText: Int): Matcher<View> {
+    return object : TypeSafeMatcher<View>() {
+      override fun describeTo(description: Description?) = Unit
+      override fun matchesSafely(item: View?): Boolean {
+        if (item !is TextInputLayout) return false
+        val error = item.error ?: return false
+        return item.context.getString(expectedErrorText) == error.toString()
+      }
+    }
+  }
+
+  /**
+   * Returns a matcher that matches the nested intent sent with an Intent chooser.
+   */
+  fun hasIntentChooser(matcher: Matcher<Intent>): Matcher<Intent> {
+    return allOf(
+      hasAction(Intent.ACTION_CHOOSER),
+      hasExtra(`is`(Intent.EXTRA_INTENT), matcher)
+    )
+  }
+
+  /**
+   * [noop] returns a [ViewAction] that does nothing.
+   */
+  fun noop(): ViewAction {
+    return object : ViewAction {
+      override fun getDescription() = "no-op"
+      override fun getConstraints() = any(View::class.java)
+      override fun perform(uiController: UiController, view: View) = Unit
+    }
+  }
+
+  fun withBottomNavSelectedItem(@IdRes id: Int): Matcher<View> = object : TypeSafeMatcher<View>() {
+    override fun describeTo(description: Description?) = Unit
+    override fun matchesSafely(item: View?): Boolean {
+      return item is BottomNavigationView && item.selectedItemId == id
+    }
+  }
+
+  /**
+   * Matches [matchers] in a root that [isDialog].
+   */
+  fun onViewInDialog(vararg matchers: Matcher<View>): ViewInteraction {
+    return onView(allOf(*matchers)).inRoot(isDialog())
+  }
+}

app/src/androidTest/java/com/github/ashutoshgngwr/noice/activity/AlarmRingerActivityTest.kt

@@ -0,0 +1,76 @@
+package com.github.ashutoshgngwr.noice.activity
+
+import android.content.Intent
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.testing.FragmentScenario
+import androidx.lifecycle.Lifecycle
+import androidx.media.AudioAttributesCompat
+import androidx.test.core.app.ActivityScenario
+import androidx.test.espresso.Espresso.onView
+import androidx.test.espresso.action.ViewActions.swipeRight
+import androidx.test.espresso.assertion.ViewAssertions.matches
+import androidx.test.espresso.matcher.ViewMatchers.isDisplayed
+import androidx.test.espresso.matcher.ViewMatchers.withId
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.github.ashutoshgngwr.noice.R
+import com.github.ashutoshgngwr.noice.playback.PlaybackController
+import io.mockk.every
+import io.mockk.mockkObject
+import io.mockk.unmockkAll
+import io.mockk.verify
+import org.junit.After
+import org.junit.Assert.assertEquals
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class AlarmRingerActivityTest {
+
+  @Before
+  fun setup() {
+    mockkObject(PlaybackController)
+    every { PlaybackController.setAudioUsage(any(), any()) } returns Unit
+    every { PlaybackController.pause(any()) } returns Unit
+    every { PlaybackController.playPreset(any(), any()) } returns Unit
+  }
+
+  @After
+  fun teardown() {
+    unmockkAll()
+  }
+
+  @Test
+  fun testWithoutPresetID() {
+    val scenario = ActivityScenario.launch(AlarmRingerActivity::class.java)
+    verify(exactly = 1, timeout = 5000L) { PlaybackController.pause(any()) }
+    assertEquals(Lifecycle.State.DESTROYED, scenario.state)
+  }
+
+  @Test
+  fun testWithPresetID() {
+    val presetID = "test-preset-id"
+
+    // cannot launch Activity using `ActivityScenario.launch(Intent)` method. For whatever reasons,
+    // it increases the startup time for all subsequent `ActivityScenario.launch(Class)`s from
+    // other classes.
+    FragmentScenario.launch(Fragment::class.java).onFragment {
+      it.startActivity(
+        Intent(it.requireContext(), AlarmRingerActivity::class.java)
+          .putExtra(AlarmRingerActivity.EXTRA_PRESET_ID, presetID)
+      )
+    }
+
+    onView(withId(R.id.dismiss_slider)).check(matches(isDisplayed()))
+    verify(exactly = 1, timeout = 5000L) {
+      PlaybackController.setAudioUsage(any(), AudioAttributesCompat.USAGE_ALARM)
+      PlaybackController.playPreset(any(), presetID)
+    }
+
+    onView(withId(R.id.dismiss_slider)).perform(swipeRight())
+    verify(exactly = 1, timeout = 5000L) {
+      PlaybackController.setAudioUsage(any(), AudioAttributesCompat.USAGE_MEDIA)
+      PlaybackController.pause(any())
+    }
+  }
+}

app/src/androidTest/java/com/github/ashutoshgngwr/noice/activity/AppIntroActivityTest.kt

@@ -0,0 +1,117 @@
+package com.github.ashutoshgngwr.noice.activity
+
+import android.app.Activity
+import androidx.core.content.edit
+import androidx.preference.PreferenceManager
+import androidx.test.core.app.ActivityScenario
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.espresso.Espresso.onView
+import androidx.test.espresso.action.ViewActions.click
+import androidx.test.espresso.action.ViewActions.swipeLeft
+import androidx.test.espresso.assertion.ViewAssertions.matches
+import androidx.test.espresso.intent.Intents
+import androidx.test.espresso.intent.Intents.intended
+import androidx.test.espresso.intent.matcher.IntentMatchers.hasComponent
+import androidx.test.espresso.matcher.ViewMatchers.isDisplayed
+import androidx.test.espresso.matcher.ViewMatchers.withId
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.github.ashutoshgngwr.noice.R
+import org.junit.After
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertTrue
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class AppIntroActivityTest {
+
+  private lateinit var activityScenario: ActivityScenario<AppIntroActivity>
+
+  @Before
+  fun setup() {
+    activityScenario = ActivityScenario.launch(AppIntroActivity::class.java)
+  }
+
+  @After
+  fun teardown() {
+    PreferenceManager.getDefaultSharedPreferences(ApplicationProvider.getApplicationContext())
+      .edit { clear() }
+  }
+
+  @Test
+  fun testOnSkipPressed() {
+    onView(withId(R.id.skip))
+      .check(matches(isDisplayed()))
+      .perform(click())
+
+    // not using activityScenario.state since it never transitions to destroyed without adding an
+    // arbitrary wait before assertions.
+    assertEquals(Activity.RESULT_CANCELED, activityScenario.result?.resultCode)
+
+    // should update the preferences
+    PreferenceManager.getDefaultSharedPreferences(ApplicationProvider.getApplicationContext())
+      .getBoolean(AppIntroActivity.PREF_HAS_USER_SEEN_APP_INTRO, false)
+      .also { assertTrue(it) }
+  }
+
+  @Test
+  fun testOnDonePressed() {
+    while (true) {
+      try {
+        onView(withId(R.id.done))
+          .check(matches(isDisplayed()))
+          .perform(click())
+
+        break
+      } catch (e: AssertionError) {
+        onView(withId(R.id.view_pager))
+          .check(matches(isDisplayed()))
+          .perform(swipeLeft())
+      }
+    }
+
+    // not using activityScenario.state since it never transitions to destroyed without adding an
+    // arbitrary wait before assertions.
+    assertEquals(Activity.RESULT_CANCELED, activityScenario.result?.resultCode)
+
+    // should update the preferences
+    PreferenceManager.getDefaultSharedPreferences(ApplicationProvider.getApplicationContext())
+      .getBoolean(AppIntroActivity.PREF_HAS_USER_SEEN_APP_INTRO, false)
+      .also { assertTrue(it) }
+  }
+
+  @Test
+  fun testMaybeStart_whenUserIsTryingToSeeItForTheFirstTime() {
+    Intents.init()
+    try {
+      // leveraging currently created activityScenario to start another instance of self. (:
+      activityScenario.onActivity {
+        AppIntroActivity.maybeStart(it)
+      }
+
+      intended(hasComponent(AppIntroActivity::class.qualifiedName))
+    } finally {
+      Intents.release()
+    }
+  }
+
+  @Test
+  fun testMaybeStart_whenUserHasAlreadySeenIt() {
+    Intents.init()
+    try {
+      // when user has already seen the activity once, i.e., if the preference is present in the
+      // storage, maybeStart shouldn't start the activity.
+      PreferenceManager.getDefaultSharedPreferences(ApplicationProvider.getApplicationContext())
+        .edit { putBoolean(AppIntroActivity.PREF_HAS_USER_SEEN_APP_INTRO, true) }
+
+      activityScenario.onActivity {
+        AppIntroActivity.maybeStart(it)
+      }
+
+      assertEquals(0, Intents.getIntents().size)
+    } finally {
+      Intents.release()
+    }
+  }
+}

app/src/androidTest/java/com/github/ashutoshgngwr/noice/activity/MainActivityTest.kt

@@ -0,0 +1,180 @@
+package com.github.ashutoshgngwr.noice.activity
+
+import android.content.Intent
+import android.net.Uri
+import androidx.appcompat.app.AppCompatDelegate
+import androidx.core.content.edit
+import androidx.navigation.findNavController
+import androidx.preference.PreferenceManager
+import androidx.test.core.app.ActivityScenario
+import androidx.test.core.app.ActivityScenario.launch
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.espresso.Espresso.onView
+import androidx.test.espresso.action.ViewActions.click
+import androidx.test.espresso.assertion.ViewAssertions.doesNotExist
+import androidx.test.espresso.assertion.ViewAssertions.matches
+import androidx.test.espresso.matcher.ViewMatchers.*
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.github.ashutoshgngwr.noice.BuildConfig
+import com.github.ashutoshgngwr.noice.EspressoX
+import com.github.ashutoshgngwr.noice.NoiceApplication
+import com.github.ashutoshgngwr.noice.R
+import com.github.ashutoshgngwr.noice.playback.PlaybackController
+import com.github.ashutoshgngwr.noice.provider.AnalyticsProvider
+import com.github.ashutoshgngwr.noice.provider.BillingProvider
+import com.github.ashutoshgngwr.noice.provider.CrashlyticsProvider
+import com.github.ashutoshgngwr.noice.repository.SettingsRepository
+import io.mockk.every
+import io.mockk.mockk
+import io.mockk.mockkObject
+import io.mockk.slot
+import io.mockk.unmockkAll
+import io.mockk.verify
+import org.junit.After
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertTrue
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class MainActivityTest {
+
+  private lateinit var activityScenario: ActivityScenario<MainActivity>
+
+  @Before
+  fun setup() {
+    // mark app intro as seen to run main activity tests in peace
+    PreferenceManager.getDefaultSharedPreferences(ApplicationProvider.getApplicationContext())
+      .edit {
+        putBoolean(AppIntroActivity.PREF_HAS_USER_SEEN_APP_INTRO, true)
+        putBoolean(MainActivity.PREF_HAS_SEEN_DATA_COLLECTION_CONSENT, true)
+        putBoolean(MainActivity.PREF_HAS_SEEN_V2_ANNOUNCEMENT, true)
+      }
+
+    activityScenario = launch(MainActivity::class.java)
+  }
+
+  @After
+  fun teardown() {
+    unmockkAll()
+    PreferenceManager.getDefaultSharedPreferences(ApplicationProvider.getApplicationContext())
+      .edit { clear() }
+  }
+
+  @Test
+  fun testNavDestinationExtra() {
+    activityScenario = Intent(ApplicationProvider.getApplicationContext(), MainActivity::class.java)
+      .let {
+        it.putExtra(MainActivity.EXTRA_NAV_DESTINATION, R.id.about)
+        launch(it)
+      }
+
+    activityScenario.onActivity {
+      val navController = it.findNavController(R.id.nav_host_fragment)
+      assertEquals(R.id.about, navController.currentDestination?.id)
+    }
+  }
+
+  @Test
+  fun testAppTheme() {
+    val nightModes = arrayOf(
+      AppCompatDelegate.MODE_NIGHT_NO,
+      AppCompatDelegate.MODE_NIGHT_YES,
+      AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM
+    )
+
+    val mockRepo = mockk<SettingsRepository>(relaxed = true)
+    mockkObject(SettingsRepository)
+    every { SettingsRepository.newInstance(any()) } returns mockRepo
+    for (nightMode in nightModes) {
+      every { mockRepo.getAppThemeAsNightMode() } returns nightMode
+      activityScenario.recreate()
+      assertEquals(nightMode, AppCompatDelegate.getDefaultNightMode())
+    }
+  }
+
+  @Test
+  fun testPresetUriIntent() {
+    mockkObject(PlaybackController)
+    val inputs = arrayOf(
+      "https://ashutoshgngwr.github.io/noice/preset?name=test&playerStates=[]",
+      "noice://preset?name=test&playerStates=[]"
+    )
+
+    every { PlaybackController.playPresetFromUri(any(), any()) } returns Unit
+    for (input in inputs) {
+      val uri = Uri.parse(input)
+      activityScenario.onActivity {
+        it.startActivity(
+          Intent(it, MainActivity::class.java)
+            .setAction(Intent.ACTION_VIEW)
+            .setData(uri)
+        )
+      }
+
+      verify(exactly = 1, timeout = 5000L) { PlaybackController.playPresetFromUri(any(), uri) }
+    }
+  }
+
+  @Test
+  fun testUsageDataCollectionDialog() {
+    val mockAnalyticsProvider: AnalyticsProvider = mockk(relaxed = true)
+    val mockCrashlyticsProvider: CrashlyticsProvider = mockk(relaxed = true)
+
+    ApplicationProvider.getApplicationContext<NoiceApplication>().apply {
+      analyticsProvider = mockAnalyticsProvider
+      crashlyticsProvider = mockCrashlyticsProvider
+    }
+
+    PreferenceManager.getDefaultSharedPreferences(ApplicationProvider.getApplicationContext())
+      .edit { remove(MainActivity.PREF_HAS_SEEN_DATA_COLLECTION_CONSENT) }
+
+    activityScenario.recreate()
+    if (BuildConfig.IS_FREE_BUILD) {
+      onView(withText(R.string.share_usage_data_consent_title)).check(doesNotExist())
+      return
+    }
+
+    onView(withText(R.string.share_usage_data_consent_title))
+      .check(matches(isDisplayed()))
+
+    onView(withText(R.string.accept)).perform(click())
+    verify(exactly = 1) {
+      mockAnalyticsProvider.setCollectionEnabled(true)
+      mockCrashlyticsProvider.setCollectionEnabled(true)
+    }
+  }
+
+  @Test
+  fun testBillingProviderListener() {
+    if (BuildConfig.IS_FREE_BUILD) { // free flavor doesn't have billing provider scenarios
+      return
+    }
+
+    val mockBillingProvider: BillingProvider = mockk(relaxed = true)
+    ApplicationProvider.getApplicationContext<NoiceApplication>()
+      .billingProvider = mockBillingProvider
+
+    activityScenario.recreate()
+
+    val slot = slot<BillingProvider.PurchaseListener>()
+    verify { mockBillingProvider.init(any(), capture(slot)) }
+    assertTrue(slot.isCaptured)
+
+    activityScenario.onActivity {
+      slot.captured.onPending(listOf("test-sku"))
+    }
+
+    onView(withText(R.string.payment_pending))
+      .check(matches(isDisplayed()))
+
+    val testOrderID = "test-order-id"
+    activityScenario.onActivity {
+      slot.captured.onComplete(listOf(), testOrderID)
+    }
+
+    EspressoX.onViewInDialog(withId(R.id.positive)).perform(click()) // close the dialog
+    verify { mockBillingProvider.consumePurchase(testOrderID) }
+  }
+}

app/src/androidTest/java/com/github/ashutoshgngwr/noice/activity/ShortcutHandlerActivityTest.kt

@@ -0,0 +1,74 @@
+package com.github.ashutoshgngwr.noice.activity
+
+import android.app.Activity
+import android.app.Instrumentation
+import android.content.Intent
+import androidx.test.core.app.ActivityScenario
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.espresso.intent.Intents
+import androidx.test.espresso.intent.matcher.IntentMatchers.hasComponent
+import androidx.test.espresso.intent.matcher.IntentMatchers.hasExtra
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.github.ashutoshgngwr.noice.R
+import com.github.ashutoshgngwr.noice.model.Preset
+import com.github.ashutoshgngwr.noice.playback.PlaybackController
+import com.github.ashutoshgngwr.noice.repository.PresetRepository
+import io.mockk.every
+import io.mockk.mockk
+import io.mockk.mockkObject
+import io.mockk.unmockkAll
+import io.mockk.verify
+import org.hamcrest.Matchers.allOf
+import org.junit.After
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class ShortcutHandlerActivityTest {
+
+  @After
+  fun teardown() {
+    unmockkAll()
+  }
+
+  @Test
+  fun testOnCreate() {
+    mockkObject(PresetRepository.Companion, PlaybackController)
+    every { PlaybackController.playPreset(any(), any()) } returns Unit
+
+    val mockRepo = mockk<PresetRepository>()
+    every { PresetRepository.newInstance(any()) } returns mockRepo
+
+    val presetIDExpectations = arrayOf("invalid-id", "valid-id")
+    val presetFindByIdReturns = arrayOf(null, mockk<Preset>(relaxed = true))
+    val playPresetCallCount = arrayOf(0, 1)
+
+    for (i in presetIDExpectations.indices) {
+      every { mockRepo.get(presetIDExpectations[i]) } returns presetFindByIdReturns[i]
+      Intents.init()
+      Intents.intending(hasComponent(MainActivity::class.qualifiedName))
+        .respondWith(Instrumentation.ActivityResult(Activity.RESULT_OK, Intent()))
+
+      try {
+        Intent(ApplicationProvider.getApplicationContext(), ShortcutHandlerActivity::class.java)
+          .putExtra(ShortcutHandlerActivity.EXTRA_SHORTCUT_ID, presetIDExpectations[i])
+          .putExtra(ShortcutHandlerActivity.EXTRA_PRESET_ID, presetIDExpectations[i])
+          .also { ActivityScenario.launch<ShortcutHandlerActivity>(it) }
+
+        Intents.intended(
+          allOf(
+            hasComponent(MainActivity::class.qualifiedName),
+            hasExtra(MainActivity.EXTRA_NAV_DESTINATION, R.id.presets)
+          ),
+          Intents.times(1)
+        )
+
+        verify(exactly = playPresetCallCount[i], timeout = 5000L) {
+          PlaybackController.playPreset(any(), presetIDExpectations[i])
+        }
+      } finally {
+        Intents.release()
+      }
+    }
+  }
+}

app/src/androidTest/java/com/github/ashutoshgngwr/noice/fragment/AboutFragmentTest.kt

@@ -0,0 +1,52 @@
+package com.github.ashutoshgngwr.noice.fragment
+
+import android.content.Intent
+import android.net.Uri
+import androidx.fragment.app.testing.FragmentScenario
+import androidx.fragment.app.testing.launchFragmentInContainer
+import androidx.test.espresso.Espresso.onView
+import androidx.test.espresso.action.ViewActions.click
+import androidx.test.espresso.intent.Intents
+import androidx.test.espresso.intent.Intents.intended
+import androidx.test.espresso.intent.matcher.IntentMatchers.filterEquals
+import androidx.test.espresso.matcher.ViewMatchers.withChild
+import androidx.test.espresso.matcher.ViewMatchers.withText
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.platform.app.InstrumentationRegistry
+import com.github.ashutoshgngwr.noice.R
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class AboutFragmentTest {
+
+  private lateinit var fragmentScenario: FragmentScenario<AboutFragment>
+
+  @Before
+  fun setup() {
+    fragmentScenario = launchFragmentInContainer()
+  }
+
+  @Test
+  fun testAboutItemClick() {
+    Intents.init()
+
+    // can't test everything. Picking one item at random
+    onView(withChild(withText(R.string.app_copyright))).perform(click())
+    intended(
+      filterEquals(
+        Intent(
+          Intent.ACTION_VIEW,
+          Uri.parse(
+            InstrumentationRegistry.getInstrumentation()
+              .targetContext
+              .getString(R.string.app_license_url)
+          )
+        )
+      )
+    )
+
+    Intents.release()
+  }
+}

app/src/androidTest/java/com/github/ashutoshgngwr/noice/fragment/DialogFragmentTest.kt

@@ -0,0 +1,169 @@
+package com.github.ashutoshgngwr.noice.fragment
+
+import android.view.View
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.testing.FragmentScenario
+import androidx.fragment.app.testing.launchFragmentInContainer
+import androidx.fragment.app.testing.withFragment
+import androidx.test.espresso.Espresso.onView
+import androidx.test.espresso.action.ViewActions.click
+import androidx.test.espresso.action.ViewActions.replaceText
+import androidx.test.espresso.assertion.ViewAssertions.matches
+import androidx.test.espresso.matcher.RootMatchers.isDialog
+import androidx.test.espresso.matcher.ViewMatchers.*
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.github.ashutoshgngwr.noice.EspressoX
+import com.github.ashutoshgngwr.noice.R
+import io.mockk.every
+import io.mockk.mockk
+import org.hamcrest.Matchers.not
+import org.junit.Assert.assertEquals
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import kotlin.random.Random
+
+@RunWith(AndroidJUnit4::class)
+class DialogFragmentTest {
+
+  private lateinit var emptyFragmentScenario: FragmentScenario<Fragment>
+
+  @Before
+  fun setup() {
+    emptyFragmentScenario = launchFragmentInContainer(null, R.style.Theme_App)
+  }
+
+  @Test
+  fun testTitleText() {
+    newDialog { title(R.string.app_name) }
+    EspressoX.onViewInDialog(withId(R.id.title), withText(R.string.app_name))
+      .check(matches(isDisplayed()))
+  }
+
+  @Test
+  fun testPositiveButton() {
+    newDialog { positiveButton(R.string.app_name) }
+    EspressoX.onViewInDialog(withId(R.id.positive), withText(R.string.app_name))
+      .perform(click())
+
+    onView(isRoot()).inRoot(not(isDialog()))
+  }
+
+  @Test
+  fun testNegativeButton() {
+    newDialog { negativeButton(R.string.app_name) }
+    EspressoX.onViewInDialog(withId(R.id.negative), withText(R.string.app_name))
+      .perform(click())
+
+    onView(isRoot()).inRoot(not(isDialog()))
+  }
+
+  @Test
+  fun testNeutralButton() {
+    newDialog { neutralButton(android.R.string.copy) }
+    EspressoX.onViewInDialog(withId(R.id.neutral), withText(android.R.string.copy))
+      .perform(click())
+
+    onView(isRoot()).inRoot(not(isDialog()))
+  }
+
+  @Test
+  fun testMessageText() {
+    newDialog { message(R.string.app_name) }
+    EspressoX.onViewInDialog(isDescendantOfA(withId(R.id.content)), withText(R.string.app_name))
+      .check(matches(isDisplayed()))
+  }
+
+  @Test
+  fun testTextInput() {
+    val mockValidator = mockk<(String) -> Int>()
+    every { mockValidator.invoke("invalid") } returns R.string.app_name
+    every { mockValidator.invoke("test") } returns 0
+    val dialogFragment = newDialog {
+      input(
+        hintRes = R.string.app_name,
+        preFillValue = "test",
+        validator = mockValidator
+      )
+    }
+
+    EspressoX.onViewInDialog(isDescendantOfA(withId(R.id.content)), withId(R.id.editText))
+      .check(matches(isDisplayed()))
+      .perform(replaceText("invalid"))
+
+    EspressoX.onViewInDialog(withId(R.id.textInputLayout))
+      .check(matches(EspressoX.withErrorText(R.string.app_name)))
+
+    EspressoX.onViewInDialog(withId(R.id.positive))
+      .check(matches(not(isEnabled())))
+
+    EspressoX.onViewInDialog(isDescendantOfA(withId(R.id.content)), withId(R.id.editText))
+      .perform(replaceText("test"))
+
+    EspressoX.onViewInDialog(withId(R.id.textInputLayout))
+      .check(matches(not(EspressoX.withErrorText(R.string.app_name))))
+
+    assertEquals("test", dialogFragment.getInputText())
+  }
+
+  @Test
+  fun testSingleChoiceList() {
+    var selectedItem = 0
+    val items = arrayOf("test-0", "test-1", "test-2")
+
+    newDialog {
+      singleChoiceItems(items, currentChoice = selectedItem) { choice ->
+        selectedItem = choice
+      }
+    }
+
+    items.forEach {
+      EspressoX.onViewInDialog(isDescendantOfA(withId(android.R.id.list)), withText(it))
+        .check(matches(isDisplayed()))
+    }
+
+    EspressoX.onViewInDialog(isDescendantOfA(withId(android.R.id.list)), withText(items[1]))
+      .perform(click())
+
+    onView(isRoot()).inRoot(not(isDialog()))
+    assertEquals(1, selectedItem)
+  }
+
+  @Test
+  fun testSlider() {
+    val id = View.generateViewId()
+    val expectedValue = Random.nextInt(10).toFloat()
+    var value = 1.0f
+
+    newDialog {
+      slider(
+        viewID = id,
+        from = 0.0f,
+        to = 10.0f,
+        value = value,
+        changeListener = { v -> value = v },
+      )
+
+      positiveButton(R.string.okay)
+    }
+
+    EspressoX.onViewInDialog(withId(id))
+      .check(matches(isDisplayed()))
+      .perform(EspressoX.slide(expectedValue))
+
+    EspressoX.onViewInDialog(withId(R.id.positive)).perform(click())
+    assertEquals(expectedValue, value)
+  }
+
+  private fun newDialog(options: DialogFragment.() -> Unit): DialogFragment {
+    val f = emptyFragmentScenario.withFragment {
+      DialogFragment.show(childFragmentManager, options)
+    }
+
+    // wait for dialog to be visible
+    EspressoX.onViewInDialog(withId(R.id.dialog_root))
+      .check(matches(isDisplayed()))
+
+    return f
+  }
+}

app/src/androidTest/java/com/github/ashutoshgngwr/noice/fragment/HomeFragmentTest.kt

@@ -0,0 +1,133 @@
+package com.github.ashutoshgngwr.noice.fragment
+
+import android.content.Context
+import androidx.core.content.edit
+import androidx.fragment.app.Fragment
+import androidx.navigation.NavController
+import androidx.navigation.findNavController
+import androidx.navigation.fragment.NavHostFragment
+import androidx.preference.PreferenceManager
+import androidx.test.core.app.ActivityScenario
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.espresso.Espresso.onView
+import androidx.test.espresso.action.ViewActions.click
+import androidx.test.espresso.assertion.ViewAssertions.doesNotExist
+import androidx.test.espresso.assertion.ViewAssertions.matches
+import androidx.test.espresso.matcher.ViewMatchers.isDisplayed
+import androidx.test.espresso.matcher.ViewMatchers.withId
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.github.ashutoshgngwr.noice.EspressoX
+import com.github.ashutoshgngwr.noice.R
+import com.github.ashutoshgngwr.noice.activity.AppIntroActivity
+import com.github.ashutoshgngwr.noice.activity.MainActivity
+import com.github.ashutoshgngwr.noice.model.Sound
+import com.github.ashutoshgngwr.noice.playback.PlaybackController
+import com.github.ashutoshgngwr.noice.repository.SettingsRepository
+import io.mockk.every
+import io.mockk.mockk
+import io.mockk.mockkObject
+import io.mockk.unmockkAll
+import org.junit.After
+import org.junit.Assert.assertEquals
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class HomeFragmentTest {
+
+  // activityScenario is more appropriate than FragmentScenario for two reasons.
+  // 1. Activity in fragment scenario doesn't have an action bar (for menu items)
+  // 2. NavController need to be manually injected in a fragment in fragment scenario.
+  private lateinit var activityScenario: ActivityScenario<MainActivity>
+  private lateinit var navController: NavController
+
+  @Before
+  fun setup() {
+    PreferenceManager.getDefaultSharedPreferences(ApplicationProvider.getApplicationContext())
+      .edit {
+        putBoolean(AppIntroActivity.PREF_HAS_USER_SEEN_APP_INTRO, true)
+        putBoolean(MainActivity.PREF_HAS_SEEN_DATA_COLLECTION_CONSENT, true)
+        putBoolean(MainActivity.PREF_HAS_SEEN_V2_ANNOUNCEMENT, true)
+      }
+
+    activityScenario = ActivityScenario.launch(MainActivity::class.java)
+    activityScenario.onActivity {
+      navController = it.findNavController(R.id.nav_host_fragment)
+    }
+  }
+
+  @After
+  fun teardown() {
+    unmockkAll()
+  }
+
+  @Test
+  fun testStartDestination() {
+    onView(withId(R.id.bottom_nav))
+      .check(matches(EspressoX.withBottomNavSelectedItem(R.id.library)))
+
+    withChildNavController {
+      assertEquals(R.id.library, it.currentDestination?.id)
+    }
+
+    mockkObject(SettingsRepository)
+    every { SettingsRepository.newInstance(any()) } returns mockk(relaxed = true) {
+      every { shouldDisplayPresetsAsHomeScreen() } returns true
+    }
+
+    setup() // haha!
+    onView(withId(R.id.bottom_nav))
+      .check(matches(EspressoX.withBottomNavSelectedItem(R.id.presets)))
+
+    withChildNavController {
+      assertEquals(R.id.presets, it.currentDestination?.id)
+    }
+  }
+
+  @Test
+  fun testPlaybackToggleMenuItem() {
+    onView(withId(R.id.action_pause))
+      .check(doesNotExist())
+
+    onView(withId(R.id.action_resume))
+      .check(doesNotExist())
+
+    // play a sound
+    val context = ApplicationProvider.getApplicationContext<Context>()
+    PlaybackController.play(context, Sound.LIBRARY.keys.first())
+
+    try {
+      onView(withId(R.id.action_pause))
+        .check(matches(isDisplayed()))
+        .perform(click())
+
+      onView(withId(R.id.action_pause))
+        .check(doesNotExist())
+
+      onView(withId(R.id.action_resume))
+        .check(matches(isDisplayed()))
+        .perform(click())
+
+      onView(withId(R.id.action_resume))
+        .check(doesNotExist())
+    } finally {
+      PlaybackController.stop(context)
+    }
+  }
+
+  private inline fun onHomeFragment(crossinline block: (HomeFragment) -> Unit) {
+    activityScenario.onActivity {
+      val parent = it.supportFragmentManager.findFragmentById(R.id.nav_host_fragment) as Fragment
+      val home = parent.childFragmentManager.fragments.first() as HomeFragment
+      block.invoke(home)
+    }
+  }
+
+  private inline fun withChildNavController(crossinline block: (NavController) -> Unit) {
+    onHomeFragment {
+      val f = it.childFragmentManager.findFragmentById(R.id.nav_host_fragment) as NavHostFragment
+      block.invoke(f.navController)
+    }
+  }
+}

app/src/androidTest/java/com/github/ashutoshgngwr/noice/fragment/LibraryFragmentTest.kt

@@ -0,0 +1,355 @@
+package com.github.ashutoshgngwr.noice.fragment
+
+import android.support.v4.media.session.PlaybackStateCompat
+import androidx.fragment.app.testing.FragmentScenario
+import androidx.fragment.app.testing.launchFragmentInContainer
+import androidx.recyclerview.widget.RecyclerView
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.espresso.Espresso.onView
+import androidx.test.espresso.action.ViewActions.click
+import androidx.test.espresso.action.ViewActions.replaceText
+import androidx.test.espresso.assertion.ViewAssertions.matches
+import androidx.test.espresso.contrib.RecyclerViewActions
+import androidx.test.espresso.matcher.ViewMatchers.*
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.github.ashutoshgngwr.noice.EspressoX
+import com.github.ashutoshgngwr.noice.MediaPlayerService
+import com.github.ashutoshgngwr.noice.NoiceApplication
+import com.github.ashutoshgngwr.noice.R
+import com.github.ashutoshgngwr.noice.model.Preset
+import com.github.ashutoshgngwr.noice.playback.PlaybackController
+import com.github.ashutoshgngwr.noice.playback.Player
+import com.github.ashutoshgngwr.noice.provider.ReviewFlowProvider
+import com.github.ashutoshgngwr.noice.repository.PresetRepository
+import com.github.ashutoshgngwr.noice.repository.SettingsRepository
+import io.mockk.every
+import io.mockk.mockk
+import io.mockk.mockkObject
+import io.mockk.mockkStatic
+import io.mockk.slot
+import io.mockk.unmockkAll
+import io.mockk.verify
+import org.greenrobot.eventbus.EventBus
+import org.hamcrest.Matchers.allOf
+import org.hamcrest.Matchers.not
+import org.junit.After
+import org.junit.Assert.assertEquals
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import kotlin.random.Random
+
+@RunWith(AndroidJUnit4::class)
+class LibraryFragmentTest {
+
+  private lateinit var mockEventBus: EventBus
+  private lateinit var mockPresetRepository: PresetRepository
+  private lateinit var mockSettingsRepository: SettingsRepository
+  private lateinit var mockReviewFlowProvider: ReviewFlowProvider
+  private lateinit var fragmentScenario: FragmentScenario<LibraryFragment>
+
+  @Before
+  fun setup() {
+    mockkStatic(EventBus::class)
+    mockkObject(
+      PlaybackController,
+      PresetRepository.Companion,
+      SettingsRepository.Companion
+    )
+
+    mockReviewFlowProvider = mockk(relaxed = true)
+    ApplicationProvider.getApplicationContext<NoiceApplication>()
+      .reviewFlowProvider = mockReviewFlowProvider
+
+    mockEventBus = mockk(relaxed = true)
+    mockPresetRepository = mockk(relaxed = true)
+    mockSettingsRepository = mockk(relaxed = true)
+
+    every { EventBus.getDefault() } returns mockEventBus
+    every { PresetRepository.newInstance(any()) } returns mockPresetRepository
+    every { SettingsRepository.newInstance(any()) } returns mockSettingsRepository
+
+    fragmentScenario = launchFragmentInContainer(null, R.style.Theme_App)
+  }
+
+  @After
+  fun teardown() {
+    unmockkAll()
+  }
+
+  @Test
+  fun testRecyclerViewItem_playButton() {
+    // stub the real implementation
+    every { PlaybackController.play(any(), any()) } returns Unit
+
+    onView(withId(R.id.sound_list)).perform(
+      RecyclerViewActions.actionOnItem<RecyclerView.ViewHolder>(
+        hasDescendant(allOf(withId(R.id.title), withText(R.string.birds))),
+        click()
+      )
+    )
+
+    verify(exactly = 1) { PlaybackController.play(any(), "birds") }
+  }
+
+  @Test
+  fun testRecyclerViewItem_stopButton() {
+    every { PlaybackController.stop(any(), any()) } returns Unit
+    val mockUpdateEvent = mockk<MediaPlayerService.PlaybackUpdateEvent>(relaxed = true) {
+      every { players } returns hashMapOf("birds" to mockk(relaxed = true))
+    }
+
+    fragmentScenario.onFragment { it.onPlayerManagerUpdate(mockUpdateEvent) }
+    onView(withId(R.id.sound_list)).perform(
+      RecyclerViewActions.actionOnItem<RecyclerView.ViewHolder>(
+        allOf(
+          hasDescendant(allOf(withId(R.id.title), withText(R.string.birds))),
+          hasDescendant(
+            allOf(withId(R.id.play_indicator), withEffectiveVisibility(Visibility.VISIBLE))
+          )
+        ),
+        click()
+      )
+    )
+
+    verify(exactly = 1) { PlaybackController.stop(any(), "birds") }
+  }
+
+  @Test
+  fun testRecyclerViewItem_volumeSlider() {
+    val mockPlayer = mockk<Player>(relaxed = true) {
+      every { volume } returns Player.DEFAULT_VOLUME
+    }
+
+    val mockUpdateEvent = mockk<MediaPlayerService.PlaybackUpdateEvent>(relaxed = true) {
+      every { players } returns hashMapOf("birds" to mockPlayer)
+    }
+
+    every {
+      mockEventBus.getStickyEvent(MediaPlayerService.PlaybackUpdateEvent::class.java)
+    } returns mockUpdateEvent
+
+    fragmentScenario.onFragment { it.onPlayerManagerUpdate(mockUpdateEvent) }
+    val expectedVolumes = arrayOf(0, Player.MAX_VOLUME, 5)
+    for (expectedVolume in expectedVolumes) {
+      onView(withId(R.id.sound_list)).perform(
+        RecyclerViewActions.actionOnItem<RecyclerView.ViewHolder>(
+          hasDescendant(allOf(withId(R.id.title), withText(R.string.birds))),
+          EspressoX.clickInItem(R.id.volume_button)
+        )
+      )
+
+      EspressoX.onViewInDialog(withId(R.id.volume_slider))
+        .check(matches(isDisplayed()))
+        .perform(EspressoX.slide(expectedVolume.toFloat()))
+
+      EspressoX.onViewInDialog(withId(R.id.positive)).perform(click())
+      verify(exactly = 1) { mockPlayer.setVolume(expectedVolume) }
+    }
+  }
+
+  @Test
+  fun testRecyclerViewItem_timePeriodSlider() {
+    val mockPlayer = mockk<Player>(relaxed = true) {
+      every { timePeriod } returns Player.DEFAULT_TIME_PERIOD
+    }
+
+    val mockUpdateEvent = mockk<MediaPlayerService.PlaybackUpdateEvent>(relaxed = true) {
+      every { players } returns hashMapOf("rolling_thunder" to mockPlayer)
+    }
+
+    every {
+      mockEventBus.getStickyEvent(MediaPlayerService.PlaybackUpdateEvent::class.java)
+    } returns mockUpdateEvent
+
+    fragmentScenario.onFragment { it.onPlayerManagerUpdate(mockUpdateEvent) }
+    val expectedTimePeriods = arrayOf(
+      Player.MIN_TIME_PERIOD,
+      Player.MAX_TIME_PERIOD,
+      // following because step size of the slider is 10s
+      Random.nextInt((Player.DEFAULT_TIME_PERIOD / 10) + 1, Player.MAX_TIME_PERIOD / 10) * 10
+    )
+
+    for (expectedTimePeriod in expectedTimePeriods) {
+      onView(withId(R.id.sound_list))
+        .perform(
+          RecyclerViewActions.scrollTo<RecyclerView.ViewHolder>(
+            hasDescendant(allOf(withId(R.id.title), withText(R.string.rolling_thunder)))
+          ),
+          RecyclerViewActions.actionOnItem<RecyclerView.ViewHolder>(
+            hasDescendant(allOf(withId(R.id.title), withText(R.string.rolling_thunder))),
+            EspressoX.clickInItem(R.id.time_period_button)
+          )
+        )
+
+      EspressoX.onViewInDialog(withId(R.id.time_period_slider))
+        .check(matches(isDisplayed()))
+        .perform(EspressoX.slide(expectedTimePeriod.toFloat()))
+
+      EspressoX.onViewInDialog(withId(R.id.positive)).perform(click())
+      verify(exactly = 1) { mockPlayer.timePeriod = expectedTimePeriod }
+    }
+  }
+
+  @Test
+  fun testSavePresetButton_onUnknownPresetPlayback() {
+    val mockUpdateEvent = mockk<MediaPlayerService.PlaybackUpdateEvent>(relaxed = true) {
+      every { players } returns mockk(relaxed = true)
+    }
+
+    val states = arrayOf(
+      PlaybackStateCompat.STATE_PLAYING,
+      PlaybackStateCompat.STATE_PAUSED,
+      PlaybackStateCompat.STATE_STOPPED
+    )
+
+    val visibility = arrayOf(
+      Visibility.VISIBLE,
+      Visibility.GONE,
+      Visibility.GONE,
+    )
+
+    for (i in states.indices) {
+      every { mockUpdateEvent.state } returns states[i]
+      fragmentScenario.onFragment {
+        it.onPlayerManagerUpdate(mockUpdateEvent)
+      }
+
+      onView(withId(R.id.save_preset_button))
+        .check(matches(withEffectiveVisibility(visibility[i])))
+    }
+  }
+
+  @Test
+  fun testSavePresetButton_onKnownPresetPlayback() {
+    val mockPlayers: Map<String, Player> = hashMapOf(
+      "birds" to mockk(relaxed = true),
+      "rolling_thunder" to mockk(relaxed = true)
+    )
+
+    val preset = Preset.from("test", mockPlayers.values)
+    mockkObject(Preset.Companion)
+    every { Preset.from("", mockPlayers.values) } returns preset
+    every { mockPresetRepository.list() } returns arrayOf(preset)
+    fragmentScenario.onFragment { fragment ->
+      fragment.onPlayerManagerUpdate(mockk(relaxed = true) {
+        every { state } returns PlaybackStateCompat.STATE_PLAYING
+        every { players } returns mockPlayers
+      })
+    }
+
+    onView(withId(R.id.save_preset_button))
+      .check(matches(withEffectiveVisibility(Visibility.GONE)))
+
+    // when volume/time period slider is adjusted, save preset button should be visible.
+    // since the Sticky Event is mocked, the item being slided will perform a mock call. So we'll
+    // need to return a different instance of events (with expected value) when other components
+    // request it after sliding action happens.
+    every {
+      mockEventBus.getStickyEvent(MediaPlayerService.PlaybackUpdateEvent::class.java)
+    } returns mockk(relaxed = true) {
+      every { state } returns PlaybackStateCompat.STATE_PLAYING
+      every { players } returns hashMapOf(
+        "birds" to mockk(relaxed = true) {
+          every { volume } returns 6
+        },
+        "rolling_thunder" to mockk(relaxed = true)
+      )
+    }
+
+    onView(withId(R.id.sound_list)).perform(
+      RecyclerViewActions.actionOnItem<RecyclerView.ViewHolder>(
+        hasDescendant(allOf(withId(R.id.title), withText(R.string.birds))),
+        EspressoX.clickInItem(R.id.volume_button)
+      )
+    )
+
+    EspressoX.onViewInDialog(withId(R.id.volume_slider))
+      .check(matches(isDisplayed()))
+      .perform(EspressoX.slide(6f))
+
+    EspressoX.onViewInDialog(withId(R.id.positive)).perform(click())
+    verify(exactly = 1) { requireNotNull(mockPlayers["birds"]).setVolume(6) }
+    onView(allOf(withId(R.id.save_preset_button), withEffectiveVisibility(Visibility.VISIBLE)))
+  }
+
+  @Test
+  fun testSavePresetButton_onClick() {
+    val mockPlayers: Map<String, Player> = hashMapOf(
+      "birds" to mockk(relaxed = true) {
+        every { soundKey } returns "birds"
+        every { volume } returns 1
+        every { timePeriod } returns Player.MIN_TIME_PERIOD + 2
+      },
+      "rolling_thunder" to mockk(relaxed = true) {
+        every { soundKey } returns "rolling_thunder"
+        every { volume } returns 3
+        every { timePeriod } returns Player.MIN_TIME_PERIOD + 4
+      }
+    )
+
+    every { mockPresetRepository.list() } returns arrayOf(
+      mockk(relaxed = true) {
+        every { name } returns "test-exists"
+      }
+    )
+
+    fragmentScenario.onFragment { fragment ->
+      fragment.onPlayerManagerUpdate(mockk(relaxed = true) {
+        every { state } returns PlaybackStateCompat.STATE_PLAYING
+        every { players } returns mockPlayers
+      })
+    }
+
+    onView(withId(R.id.save_preset_button))
+      .check(matches(withEffectiveVisibility(Visibility.VISIBLE)))
+      .perform(click())
+
+    // should disable save button for duplicate names
+    EspressoX.onViewInDialog(withId(R.id.editText))
+      .check(matches(isDisplayed()))
+      .perform(replaceText("test-exists"))
+
+    EspressoX.onViewInDialog(withId(R.id.positive), withText(R.string.save))
+      .check(matches(not(isEnabled())))
+
+    EspressoX.onViewInDialog(withId(R.id.editText))
+      .perform(replaceText("test-does-not-exists"))
+
+    EspressoX.onViewInDialog(withId(R.id.positive), withText(R.string.save))
+      .check(matches(isEnabled()))
+      .perform(click())
+
+    onView(withId(R.id.save_preset_button)).check(matches(not(isDisplayed())))
+
+    val presetSlot = slot<Preset>()
+    verify { mockPresetRepository.create(capture(presetSlot)) }
+
+    for (playerState in presetSlot.captured.playerStates) {
+      assertEquals(mockPlayers[playerState.soundKey]?.volume, playerState.volume)
+      assertEquals(mockPlayers[playerState.soundKey]?.timePeriod, playerState.timePeriod)
+    }
+
+    verify(exactly = 1) { mockReviewFlowProvider.maybeAskForReview(any()) }
+  }
+
+  @Test
+  fun testShouldDisplaySoundIcons() {
+    val inputs = arrayOf(false, true)
+    val outputs = arrayOf(Visibility.GONE, Visibility.VISIBLE)
+    for (i in inputs.indices) {
+      every { mockSettingsRepository.shouldDisplaySoundIcons() } returns inputs[i]
+      fragmentScenario.recreate()
+      onView(withId(R.id.sound_list))
+        .perform(
+          RecyclerViewActions.actionOnItem<RecyclerView.ViewHolder>(
+            allOf(
+              hasDescendant(allOf(withId(R.id.title), withText(R.string.birds))),
+              hasDescendant(allOf(withId(R.id.icon), withEffectiveVisibility(outputs[i])))
+            ),
+            EspressoX.noop()
+          ),
+        )
+    }
+  }
+}

app/src/androidTest/java/com/github/ashutoshgngwr/noice/fragment/PresetsFragmentTest.kt

@@ -0,0 +1,358 @@
+package com.github.ashutoshgngwr.noice.fragment
+
+import android.content.Intent
+import android.net.Uri
+import android.support.v4.media.session.PlaybackStateCompat
+import android.widget.Button
+import androidx.core.content.pm.ShortcutInfoCompat
+import androidx.core.content.pm.ShortcutManagerCompat
+import androidx.fragment.app.testing.FragmentScenario
+import androidx.fragment.app.testing.launchFragmentInContainer
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.espresso.Espresso.onView
+import androidx.test.espresso.action.ViewActions.click
+import androidx.test.espresso.action.ViewActions.replaceText
+import androidx.test.espresso.assertion.ViewAssertions.doesNotExist
+import androidx.test.espresso.assertion.ViewAssertions.matches
+import androidx.test.espresso.contrib.RecyclerViewActions
+import androidx.test.espresso.intent.Intents
+import androidx.test.espresso.intent.Intents.intended
+import androidx.test.espresso.intent.matcher.IntentMatchers.hasAction
+import androidx.test.espresso.intent.matcher.IntentMatchers.hasExtra
+import androidx.test.espresso.matcher.ViewMatchers.*
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.github.ashutoshgngwr.noice.EspressoX
+import com.github.ashutoshgngwr.noice.NoiceApplication
+import com.github.ashutoshgngwr.noice.R
+import com.github.ashutoshgngwr.noice.activity.ShortcutHandlerActivity
+import com.github.ashutoshgngwr.noice.model.Preset
+import com.github.ashutoshgngwr.noice.playback.PlaybackController
+import com.github.ashutoshgngwr.noice.playback.Player
+import com.github.ashutoshgngwr.noice.provider.ReviewFlowProvider
+import com.github.ashutoshgngwr.noice.repository.PresetRepository
+import io.mockk.clearStaticMockk
+import io.mockk.every
+import io.mockk.mockk
+import io.mockk.mockkObject
+import io.mockk.mockkStatic
+import io.mockk.slot
+import io.mockk.unmockkAll
+import io.mockk.verify
+import org.hamcrest.Matchers.*
+import org.junit.After
+import org.junit.Assert.*
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class PresetsFragmentTest {
+
+  private lateinit var fragmentScenario: FragmentScenario<PresetsFragment>
+  private lateinit var mockPreset: Preset
+  private lateinit var mockPresetRepository: PresetRepository
+  private lateinit var mockReviewFlowProvider: ReviewFlowProvider
+
+  @Before
+  fun setup() {
+    mockkStatic(ShortcutManagerCompat::class)
+    mockkObject(
+      Preset.Companion,
+      PlaybackController,
+      PresetRepository.Companion
+    )
+
+    mockReviewFlowProvider = mockk(relaxed = true)
+    ApplicationProvider.getApplicationContext<NoiceApplication>()
+      .reviewFlowProvider = mockReviewFlowProvider
+
+    mockPreset = mockk(relaxed = true) {
+      every { id } returns "test-id"
+      every { name } returns "test"
+      every { playerStates } returns arrayOf(
+        Preset.PlayerState("test-1", Player.DEFAULT_VOLUME, Player.DEFAULT_TIME_PERIOD),
+        Preset.PlayerState("test-2", Player.MAX_VOLUME, Player.MAX_TIME_PERIOD)
+      )
+    }
+
+    mockPresetRepository = mockk {
+      every { list() } returns arrayOf(mockPreset, mockk(relaxed = true) {
+        every { name } returns "test-exists"
+      })
+    }
+
+    every { PresetRepository.newInstance(any()) } returns mockPresetRepository
+    fragmentScenario = launchFragmentInContainer(null, R.style.Theme_App)
+  }
+
+  @After
+  fun teardown() {
+    unmockkAll()
+  }
+
+  @Test
+  fun testInitialLayout() {
+    onView(withId(R.id.empty_list_hint))
+      .check(matches(withEffectiveVisibility(Visibility.GONE)))
+
+    every { mockPresetRepository.list() } returns arrayOf()
+    fragmentScenario.recreate()
+    onView(withId(R.id.empty_list_hint))
+      .check(matches(withEffectiveVisibility(Visibility.VISIBLE)))
+  }
+
+  @Test
+  fun testRecyclerViewItem_playButton() {
+    // stub the original method. Without stubbing, mockk will also run the real implementation.
+    every { PlaybackController.playPreset(any(), any()) } returns Unit
+
+    onView(withId(R.id.list)).perform(
+      RecyclerViewActions.actionOnItem<PresetsFragment.ViewHolder>(
+        hasDescendant(allOf(withId(R.id.title), withText("test"))),
+        EspressoX.clickInItem(R.id.play_button)
+      )
+    )
+
+    verify(exactly = 1) { PlaybackController.playPreset(any(), "test-id") }
+  }
+
+  @Test
+  fun testRecyclerViewItem_stopButton() {
+    // ensure that PresetsFragment assumes it is playing a preset
+    every { Preset.from(any(), any()) } returns mockPreset
+    fragmentScenario.onFragment {
+      it.onPlayerManagerUpdate(mockk(relaxed = true) {
+        every { state } returns PlaybackStateCompat.STATE_PLAYING
+      })
+    }
+
+    onView(withId(R.id.list)).perform(
+      RecyclerViewActions.actionOnItem<PresetsFragment.ViewHolder>(
+        hasDescendant(allOf(withId(R.id.title), withText("test"))),
+        EspressoX.clickInItem(R.id.play_button)
+      )
+    )
+
+    verify(exactly = 1) { PlaybackController.stop(any()) }
+  }
+
+  @Test
+  fun testRecyclerViewItem_shareOption() {
+    val presetUri = "test-preset-uri"
+    every { mockPreset.toUri() } returns Uri.parse(presetUri)
+
+    // open context menu
+    onView(withId(R.id.list)).perform(
+      RecyclerViewActions.actionOnItem<PresetsFragment.ViewHolder>(
+        hasDescendant(allOf(withId(R.id.title), withText("test"))),
+        EspressoX.clickInItem(R.id.menu_button)
+      )
+    )
+
+    try {
+      Intents.init()
+      onView(withText(R.string.share)).perform(click()) // select share option
+      intended(
+        EspressoX.hasIntentChooser(
+          allOf(
+            hasAction(Intent.ACTION_SEND),
+            hasExtra(Intent.EXTRA_TEXT, presetUri)
+          )
+        )
+      )
+    } finally {
+      Intents.release()
+    }
+  }
+
+  @Test
+  fun testRecyclerViewItem_deleteOption() {
+    every { mockPresetRepository.delete(any()) } returns true
+
+    // open context menu
+    onView(withId(R.id.list)).perform(
+      RecyclerViewActions.actionOnItem<PresetsFragment.ViewHolder>(
+        hasDescendant(allOf(withId(R.id.title), withText("test"))),
+        EspressoX.clickInItem(R.id.menu_button)
+      )
+    )
+
+    onView(withText(R.string.delete)).perform(click()) // select delete option
+    onView(allOf(instanceOf(Button::class.java), withText(R.string.delete)))
+      .perform(click()) // click delete button in confirmation dialog
+
+    onView(withText("test")).check(doesNotExist())
+    verify(exactly = 1) {
+      mockPresetRepository.delete("test-id")
+      ShortcutManagerCompat.removeDynamicShortcuts(any(), listOf("test-id"))
+      mockReviewFlowProvider.maybeAskForReview(any())
+    }
+  }
+
+  @Test
+  fun testRecyclerViewItem_deleteOption_onPresetPlaying() {
+    // ensure that PresetsFragment assumes it is playing a preset
+    every { Preset.from(any(), any()) } returns mockPreset
+    every { mockPresetRepository.delete(any()) } returns true
+
+    fragmentScenario.onFragment {
+      it.onPlayerManagerUpdate(mockk(relaxed = true) {
+        every { state } returns PlaybackStateCompat.STATE_PLAYING
+      })
+    }
+
+    // open context menu
+    onView(withId(R.id.list)).perform(
+      RecyclerViewActions.actionOnItem<PresetsFragment.ViewHolder>(
+        hasDescendant(allOf(withId(R.id.title), withText("test"))),
+        EspressoX.clickInItem(R.id.menu_button)
+      )
+    )
+
+    onView(withText(R.string.delete)).perform(click()) // select delete option
+    onView(allOf(instanceOf(Button::class.java), withText(R.string.delete)))
+      .perform(click()) // click delete button in confirmation dialog
+
+    // should publish a stop playback event if preset was playing
+    verify(exactly = 1) { PlaybackController.stop(any()) }
+  }
+
+  @Test
+  fun testRecyclerViewItem_renameOption() {
+    every { mockPresetRepository.update(any()) } returns Unit
+
+    // open context menu
+    onView(withId(R.id.list)).perform(
+      RecyclerViewActions.actionOnItem<PresetsFragment.ViewHolder>(
+        hasDescendant(allOf(withId(R.id.title), withText("test"))),
+        EspressoX.clickInItem(R.id.menu_button)
+      )
+    )
+
+    onView(withText(R.string.rename)).perform(click()) // select rename option
+    onView(withId(R.id.editText))
+      .check(matches(isDisplayed())) // check if the rename dialog was displayed
+      .perform(replaceText("test-exists")) // replace text in input field
+
+    onView(allOf(instanceOf(Button::class.java), withText(R.string.save)))
+      .check(matches(not(isEnabled())))
+
+    onView(withId(R.id.editText))
+      .check(matches(isDisplayed()))
+      .perform(replaceText("test-does-not-exists"))
+
+    onView(allOf(instanceOf(Button::class.java), withText(R.string.save)))
+      .check(matches(isEnabled()))
+      .perform(click()) // click on positive button
+
+    val presetSlot = slot<Preset>()
+    verify(exactly = 1) {
+      mockPreset.name = "test-does-not-exists"
+      mockPresetRepository.update(capture(presetSlot))
+      mockReviewFlowProvider.maybeAskForReview(any())
+    }
+
+    assertEquals(mockPreset, presetSlot.captured)
+  }
+
+  @Test
+  fun testRecyclerViewItem_AddToHomeScreenOption() {
+    val pinShortcutSupportedExpectations = arrayOf(false, true)
+    val expectedRequestPinShortcutCalls = arrayOf(0, 1)
+
+    for (i in pinShortcutSupportedExpectations.indices) {
+      // prevent system dialog from showing up.
+      every { ShortcutManagerCompat.requestPinShortcut(any(), any(), any()) } returns true
+      every {
+        ShortcutManagerCompat.isRequestPinShortcutSupported(any())
+      } returns pinShortcutSupportedExpectations[i]
+
+      // open context menu
+      onView(withId(R.id.list)).perform(
+        RecyclerViewActions.actionOnItem<PresetsFragment.ViewHolder>(
+          hasDescendant(allOf(withId(R.id.title), withText("test"))),
+          EspressoX.clickInItem(R.id.menu_button)
+        )
+      )
+
+      onView(withText(R.string.add_to_home_screen)).perform(click()) // select add to home screen option
+
+      val shortcutInfoSlot = slot<ShortcutInfoCompat>()
+      verify(exactly = expectedRequestPinShortcutCalls[i]) {
+        ShortcutManagerCompat.requestPinShortcut(any(), capture(shortcutInfoSlot), any())
+      }
+
+      if (pinShortcutSupportedExpectations[i]) {
+        assertTrue(
+          "should capture a ShortcutInfo from requestPinShortcut() call",
+          shortcutInfoSlot.isCaptured
+        )
+
+        assertNotNull(shortcutInfoSlot.captured.id)
+        assertEquals("test", shortcutInfoSlot.captured.shortLabel)
+
+        val intent = shortcutInfoSlot.captured.intent
+        assertEquals(ShortcutHandlerActivity::class.qualifiedName, intent.component?.className)
+        assertNotNull(intent.getStringExtra(ShortcutHandlerActivity.EXTRA_SHORTCUT_ID))
+        assertEquals("test-id", intent.getStringExtra(ShortcutHandlerActivity.EXTRA_PRESET_ID))
+      } else {
+        assertFalse(
+          "should not capture a ShortcutInfo from requestPinShortcut() call",
+          shortcutInfoSlot.isCaptured
+        )
+
+        onView(withId(com.google.android.material.R.id.snackbar_text))
+          .check(matches(withText(R.string.pinned_shortcuts_not_supported)))
+      }
+
+      clearStaticMockk(ShortcutManagerCompat::class)
+    }
+  }
+
+  @Test
+  fun testRecyclerViewItem_addToAppShortcuts() {
+    every { ShortcutManagerCompat.addDynamicShortcuts(any(), any()) } returns true
+    every { ShortcutManagerCompat.getDynamicShortcuts(any()) } returns mutableListOf()
+
+    // open context menu
+    onView(withId(R.id.list)).perform(
+      RecyclerViewActions.actionOnItem<PresetsFragment.ViewHolder>(
+        hasDescendant(allOf(withId(R.id.title), withText("test"))),
+        EspressoX.clickInItem(R.id.menu_button)
+      )
+    )
+
+    onView(withText(R.string.add_to_app_shortcuts)).perform(click())
+
+    val shortcutInfoSlot = slot<List<ShortcutInfoCompat>>()
+    verify(exactly = 1) {
+      ShortcutManagerCompat.addDynamicShortcuts(any(), capture(shortcutInfoSlot))
+    }
+
+    assertEquals(1, shortcutInfoSlot.captured.size)
+    assertEquals("test-id", shortcutInfoSlot.captured[0].id)
+  }
+
+  @Test
+  fun testRecyclerViewItem_removeFromAppShortcuts() {
+    every { ShortcutManagerCompat.getDynamicShortcuts(any()) } returns listOf(
+      mockk(relaxed = true) {
+        every { id } returns mockPreset.id
+      }
+    )
+
+    // open context menu
+    onView(withId(R.id.list)).perform(
+      RecyclerViewActions.actionOnItem<PresetsFragment.ViewHolder>(
+        hasDescendant(allOf(withId(R.id.title), withText("test"))),
+        EspressoX.clickInItem(R.id.menu_button)
+      )
+    )
+
+    onView(withText(R.string.remove_from_app_shortcuts)).perform(click())
+
+    verify(exactly = 1) {
+      ShortcutManagerCompat.removeDynamicShortcuts(any(), listOf("test-id"))
+    }
+  }
+}

app/src/androidTest/java/com/github/ashutoshgngwr/noice/fragment/RandomPresetFragmentTest.kt

@@ -0,0 +1,71 @@
+package com.github.ashutoshgngwr.noice.fragment
+
+import androidx.fragment.app.testing.launchFragmentInContainer
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.espresso.Espresso.onView
+import androidx.test.espresso.action.ViewActions
+import androidx.test.espresso.matcher.ViewMatchers.withId
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.github.ashutoshgngwr.noice.NoiceApplication
+import com.github.ashutoshgngwr.noice.R
+import com.github.ashutoshgngwr.noice.model.Sound
+import com.github.ashutoshgngwr.noice.playback.PlaybackController
+import io.mockk.every
+import io.mockk.mockk
+import io.mockk.mockkObject
+import io.mockk.unmockkAll
+import io.mockk.verify
+import org.junit.After
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class RandomPresetFragmentTest {
+
+  @Before
+  fun setup() {
+    mockkObject(PlaybackController)
+    every { PlaybackController.playRandomPreset(any(), any(), any()) } returns Unit
+    ApplicationProvider.getApplicationContext<NoiceApplication>()
+      .reviewFlowProvider = mockk(relaxed = true)
+  }
+
+  @After
+  fun teardown() {
+    unmockkAll()
+  }
+
+  @Test
+  fun testRandomPresetButton_onClick() {
+    val intensities = mapOf(
+      R.id.preset_intensity__any to RandomPresetFragment.RANGE_INTENSITY_ANY,
+      R.id.preset_intensity__dense to RandomPresetFragment.RANGE_INTENSITY_DENSE,
+      R.id.preset_intensity__light to RandomPresetFragment.RANGE_INTENSITY_LIGHT
+    )
+
+    val types = mapOf(
+      R.id.preset_type__any to null,
+      R.id.preset_type__focus to Sound.Tag.FOCUS,
+      R.id.preset_type__relax to Sound.Tag.RELAX
+    )
+
+    launchFragmentInContainer<RandomPresetFragment>(null, R.style.Theme_App)
+
+    val intensityID = intensities.keys.random()
+    val typeID = types.keys.random()
+
+    onView(withId(typeID)).perform(ViewActions.click())
+    onView(withId(intensityID)).perform(ViewActions.click())
+
+    onView(withId(R.id.play_button))
+      .perform(ViewActions.click())
+
+    verify(exactly = 1) {
+      PlaybackController.playRandomPreset(
+        any(), types[typeID],
+        intensities[intensityID] ?: IntRange.EMPTY
+      )
+    }
+  }
+}

app/src/androidTest/java/com/github/ashutoshgngwr/noice/fragment/SettingsFragmentTest.kt

@@ -0,0 +1,143 @@
+package com.github.ashutoshgngwr.noice.fragment
+
+import android.content.Context
+import android.net.Uri
+import androidx.appcompat.app.AppCompatDelegate
+import androidx.core.content.pm.ShortcutManagerCompat
+import androidx.fragment.app.testing.FragmentScenario
+import androidx.fragment.app.testing.launchFragmentInContainer
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.espresso.Espresso.onView
+import androidx.test.espresso.action.ViewActions.click
+import androidx.test.espresso.assertion.ViewAssertions.matches
+import androidx.test.espresso.contrib.RecyclerViewActions
+import androidx.test.espresso.matcher.ViewMatchers.*
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.github.ashutoshgngwr.noice.EspressoX
+import com.github.ashutoshgngwr.noice.R
+import com.github.ashutoshgngwr.noice.repository.PresetRepository
+import com.github.ashutoshgngwr.noice.repository.SettingsRepository
+import io.mockk.every
+import io.mockk.mockk
+import io.mockk.mockkObject
+import io.mockk.mockkStatic
+import io.mockk.verify
+import org.junit.Assert.assertEquals
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import java.io.File
+import java.io.InputStream
+import java.io.OutputStream
+
+@RunWith(AndroidJUnit4::class)
+class SettingsFragmentTest {
+
+  private lateinit var mockPresetRepository: PresetRepository
+  private lateinit var fragmentScenario: FragmentScenario<SettingsFragment>
+
+  @Before
+  fun setup() {
+    mockPresetRepository = mockk()
+    mockkObject(PresetRepository)
+    every { PresetRepository.newInstance(any()) } returns mockPresetRepository
+    fragmentScenario = launchFragmentInContainer(null, R.style.Theme_App)
+  }
+
+  @Test
+  fun testExportPresets() {
+    val exportData = "test-preset-data"
+    every { mockPresetRepository.writeTo(any()) } answers {
+      firstArg<OutputStream>().write(exportData.toByteArray())
+    }
+
+    // skipping the part where we click the preference and then select a file
+    val file = File.createTempFile(
+      "test-export",
+      null,
+      ApplicationProvider.getApplicationContext<Context>().cacheDir
+    )
+
+    try {
+      fragmentScenario.onFragment { it.onCreateDocumentResult(Uri.fromFile(file)) }
+      assertEquals(exportData, file.readText())
+    } finally {
+      file.delete()
+    }
+  }
+
+  @Test
+  fun testImportPresets() {
+    val importData = "test-preset-data"
+    every { mockPresetRepository.readFrom(any()) } answers {
+      assertEquals(importData, firstArg<InputStream>().readBytes().decodeToString())
+    }
+
+    val file = File.createTempFile(
+      "test-export",
+      null,
+      ApplicationProvider.getApplicationContext<Context>().cacheDir
+    )
+
+    try {
+      file.writeText(importData)
+      fragmentScenario.onFragment { it.onOpenDocumentResult(Uri.fromFile(file)) }
+      verify(exactly = 1) { mockPresetRepository.readFrom(any()) }
+    } finally {
+      file.delete()
+    }
+  }
+
+  @Test
+  fun testRemoveAllAppShortcuts() {
+    mockkStatic(ShortcutManagerCompat::class)
+    onView(withId(androidx.preference.R.id.recycler_view))
+      .perform(
+        RecyclerViewActions.actionOnItem<androidx.preference.PreferenceViewHolder>(
+          hasDescendant(withText(R.string.remove_all_app_shortcuts)), click()
+        )
+      )
+
+    EspressoX.onViewInDialog(withId(R.id.positive))
+      .perform(click())
+
+    verify(exactly = 1) { ShortcutManagerCompat.removeAllDynamicShortcuts(any()) }
+  }
+
+  @Test
+  fun testAppThemePreference() {
+    val nightModes = arrayOf(
+      AppCompatDelegate.MODE_NIGHT_NO,
+      AppCompatDelegate.MODE_NIGHT_YES,
+      AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM
+    )
+
+    val prefSummary = arrayOf(
+      R.string.app_theme_light,
+      R.string.app_theme_dark,
+      R.string.app_theme_system_default
+    )
+
+    val context = ApplicationProvider.getApplicationContext<Context>()
+    val themes = context.resources.getStringArray(R.array.app_themes)
+    val repo = SettingsRepository.newInstance(context)
+
+    for (i in themes.indices) {
+      onView(withId(androidx.preference.R.id.recycler_view))
+        .perform(
+          RecyclerViewActions.actionOnItem<androidx.preference.PreferenceViewHolder>(
+            hasDescendant(withText(R.string.app_theme)), click()
+          )
+        )
+
+      EspressoX.onViewInDialog(withText(themes[i]))
+        .check(matches(isDisplayed()))
+        .perform(click())
+
+      // wait for activity to be recreated.
+      onView(withText(R.string.app_theme)).check(matches(isDisplayed()))
+      onView(withText(prefSummary[i])).check(matches(isDisplayed()))
+      assertEquals(nightModes[i], repo.getAppThemeAsNightMode())
+    }
+  }
+}

app/src/androidTest/java/com/github/ashutoshgngwr/noice/fragment/SleepTimerFragmentTest.kt

@@ -0,0 +1,99 @@
+package com.github.ashutoshgngwr.noice.fragment
+
+import android.os.SystemClock
+import androidx.fragment.app.testing.FragmentScenario
+import androidx.fragment.app.testing.launchFragmentInContainer
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.espresso.Espresso.onView
+import androidx.test.espresso.action.ViewActions.click
+import androidx.test.espresso.action.ViewActions.scrollTo
+import androidx.test.espresso.assertion.ViewAssertions.matches
+import androidx.test.espresso.matcher.ViewMatchers.*
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.github.ashutoshgngwr.noice.EspressoX
+import com.github.ashutoshgngwr.noice.NoiceApplication
+import com.github.ashutoshgngwr.noice.R
+import com.github.ashutoshgngwr.noice.databinding.SleepTimerFragmentBinding
+import com.github.ashutoshgngwr.noice.playback.PlaybackController
+import io.mockk.every
+import io.mockk.mockk
+import io.mockk.mockkObject
+import io.mockk.unmockkAll
+import io.mockk.verify
+import org.hamcrest.Matchers.not
+import org.junit.After
+import org.junit.Assert.assertTrue
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import java.util.concurrent.TimeUnit
+
+@RunWith(AndroidJUnit4::class)
+class SleepTimerFragmentTest {
+
+  private lateinit var fragmentScenario: FragmentScenario<SleepTimerFragment>
+
+  @Before
+  fun setup() {
+    mockkObject(PlaybackController)
+    every { PlaybackController.scheduleAutoStop(any(), any()) } returns Unit
+
+    ApplicationProvider.getApplicationContext<NoiceApplication>()
+      .reviewFlowProvider = mockk(relaxed = true)
+
+    fragmentScenario = launchFragmentInContainer(null, R.style.Theme_App)
+  }
+
+  @After
+  fun teardown() {
+    unmockkAll()
+  }
+
+  @Test
+  fun testDurationPickerListener_onSleepPreScheduled() {
+    val before = SystemClock.uptimeMillis()
+    every { PlaybackController.getScheduledAutoStopRemainingDurationMillis(any()) } returns 60L * 1000
+    onView(withId(R.id.duration_picker)).perform(EspressoX.addDurationToPicker(60))
+    verify(exactly = 1) {
+      PlaybackController.scheduleAutoStop(any(), withArg {
+        val delta = SystemClock.uptimeMillis() - before
+        val duration = TimeUnit.SECONDS.toMillis(120)
+        assertTrue(it in (duration - delta)..(duration))
+      })
+    }
+  }
+
+  @Test
+  fun testDurationPickerListener() {
+    val before = SystemClock.uptimeMillis()
+    onView(withId(R.id.duration_picker)).perform(EspressoX.addDurationToPicker(300))
+    verify(exactly = 1) {
+      PlaybackController.scheduleAutoStop(any(), withArg {
+        val delta = SystemClock.uptimeMillis() - before
+        val duration = TimeUnit.SECONDS.toMillis(300)
+        assertTrue(it in (duration - delta)..(duration))
+      })
+    }
+  }
+
+  @Test
+  fun testResetButton_shouldNotBeEnabledByDefault() {
+    onView(EspressoX.withDurationPickerResetButton(withId(R.id.duration_picker)))
+      .check(matches(not(isEnabled())))
+  }
+
+  @Test
+  fun testResetButton_onAutoSleepScheduled() {
+    fragmentScenario.onFragment {
+      SleepTimerFragmentBinding.bind(it.requireView()).also { binding ->
+        binding.durationPicker.setResetButtonEnabled(true)
+      }
+    }
+
+    onView(EspressoX.withDurationPickerResetButton(withId(R.id.duration_picker)))
+      .perform(scrollTo(), click())
+
+    onView(withText(R.string.auto_sleep_schedule_cancelled)).check(matches(isDisplayed()))
+    verify(exactly = 1) { PlaybackController.clearScheduledAutoStop(any()) }
+  }
+}

app/src/androidTest/java/com/github/ashutoshgngwr/noice/fragment/SupportDevelopmentFragmentTest.kt

@@ -0,0 +1,45 @@
+package com.github.ashutoshgngwr.noice.fragment
+
+import android.content.Intent
+import androidx.fragment.app.testing.FragmentScenario
+import androidx.fragment.app.testing.launchFragmentInContainer
+import androidx.test.espresso.Espresso.onView
+import androidx.test.espresso.action.ViewActions.click
+import androidx.test.espresso.action.ViewActions.scrollTo
+import androidx.test.espresso.intent.Intents
+import androidx.test.espresso.intent.matcher.IntentMatchers
+import androidx.test.espresso.matcher.ViewMatchers.withId
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.github.ashutoshgngwr.noice.R
+import org.junit.After
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class SupportDevelopmentFragmentTest {
+
+  private lateinit var fragmentScenario: FragmentScenario<SupportDevelopmentFragment>
+
+  @Before
+  fun setup() {
+    fragmentScenario = launchFragmentInContainer(null, R.style.Theme_App)
+    Intents.init()
+  }
+
+  @After
+  fun teardown() {
+    Intents.release()
+  }
+
+  @Test
+  fun testShareWithFriendsButton() {
+    onView(withId(R.id.share_button)).perform(scrollTo(), click())
+
+    Intents.intended(
+      IntentMatchers.filterEquals(
+        Intent(Intent.ACTION_CHOOSER)
+      )
+    )
+  }
+}

app/src/androidTest/java/com/github/ashutoshgngwr/noice/fragment/WakeUpTimerFragmentTest.kt

@@ -0,0 +1,274 @@
+package com.github.ashutoshgngwr.noice.fragment
+
+import android.icu.util.Calendar
+import androidx.core.content.edit
+import androidx.fragment.app.testing.FragmentScenario
+import androidx.fragment.app.testing.launchFragmentInContainer
+import androidx.preference.PreferenceManager
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.espresso.Espresso.onView
+import androidx.test.espresso.action.ViewActions.click
+import androidx.test.espresso.action.ViewActions.scrollTo
+import androidx.test.espresso.assertion.ViewAssertions.matches
+import androidx.test.espresso.contrib.PickerActions
+import androidx.test.espresso.matcher.ViewMatchers.*
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.github.ashutoshgngwr.noice.NoiceApplication
+import com.github.ashutoshgngwr.noice.R
+import com.github.ashutoshgngwr.noice.WakeUpTimerManager
+import com.github.ashutoshgngwr.noice.model.Preset
+import com.github.ashutoshgngwr.noice.provider.ReviewFlowProvider
+import com.github.ashutoshgngwr.noice.repository.PresetRepository
+import io.mockk.clearMocks
+import io.mockk.every
+import io.mockk.mockk
+import io.mockk.mockkObject
+import io.mockk.slot
+import io.mockk.unmockkAll
+import io.mockk.verify
+import org.hamcrest.Matchers.not
+import org.junit.After
+import org.junit.Assert.assertEquals
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class WakeUpTimerFragmentTest {
+
+  private lateinit var mockPresetRepository: PresetRepository
+  private lateinit var mockReviewFlowProvider: ReviewFlowProvider
+  private lateinit var fragmentScenario: FragmentScenario<WakeUpTimerFragment>
+
+  @Before
+  fun setup() {
+    mockkObject(PresetRepository.Companion, WakeUpTimerManager)
+
+    mockReviewFlowProvider = mockk(relaxed = true)
+    ApplicationProvider.getApplicationContext<NoiceApplication>()
+      .reviewFlowProvider = mockReviewFlowProvider
+
+    mockPresetRepository = mockk {
+      every { get(null) } returns null
+      every { list() } returns emptyArray()
+    }
+
+    every { PresetRepository.newInstance(any()) } returns mockPresetRepository
+    every { WakeUpTimerManager.set(any(), any()) } returns Unit
+    fragmentScenario = launchFragmentInContainer(null, R.style.Theme_App)
+  }
+
+  @After
+  fun teardown() {
+    unmockkAll()
+    with(PreferenceManager.getDefaultSharedPreferences(ApplicationProvider.getApplicationContext())) {
+      edit { clear() }
+    }
+  }
+
+  @Test
+  fun testInitialLayout_whenTimerIsNotPreScheduled() {
+    onView(withId(R.id.select_preset_button))
+      .check(matches(isEnabled()))
+      .check(matches(withText(R.string.select_preset)))
+
+    onView(withId(R.id.set_time_button))
+      .check(matches(not(isEnabled())))
+
+    onView(withId(R.id.reset_time_button))
+      .check(matches(not(isEnabled())))
+  }
+
+  @Test
+  fun testInitialLayout_whenTimerIsPreScheduled() {
+    val expectedPresetID = "test-preset-id"
+    val expectedPresetName = "test-preset-name"
+    every { mockPresetRepository.get(expectedPresetID) } returns mockk {
+      every { name } returns expectedPresetName
+    }
+
+    every { WakeUpTimerManager.get(any()) } returns mockk {
+      every { presetID } returns expectedPresetID
+      every { atMillis } returns System.currentTimeMillis() + 10000L
+    }
+
+    // fragmentScenario.recreate() // for whatever reasons, doesn't invoke Fragment.onViewCreated().
+    fragmentScenario.onFragment { it.onViewCreated(it.requireView(), null) }
+
+    onView(withId(R.id.select_preset_button))
+      .check(matches(isEnabled()))
+      .check(matches(withText(expectedPresetName)))
+
+    onView(withId(R.id.set_time_button))
+      .check(matches(isEnabled()))
+
+    onView(withId(R.id.reset_time_button))
+      .check(matches(isEnabled()))
+  }
+
+  @Test
+  fun testInitialLayout_whenTimerIsPreScheduled_andPresetIsDeletedFromStorage() {
+    every { mockPresetRepository.get("test") } returns null
+    every { WakeUpTimerManager.get(any()) } returns mockk {
+      every { presetID } returns "test"
+      every { atMillis } returns System.currentTimeMillis() + 10000L
+    }
+
+    fragmentScenario.recreate()
+    onView(withId(R.id.select_preset_button))
+      .check(matches(isEnabled()))
+      .check(matches(withText(R.string.select_preset)))
+
+    onView(withId(R.id.set_time_button))
+      .check(matches(not(isEnabled())))
+
+    onView(withId(R.id.reset_time_button))
+      .check(matches(not(isEnabled())))
+  }
+
+  @Test
+  fun testSelectPreset_withoutPresets() {
+    every { mockPresetRepository.list() } returns arrayOf()
+    onView(withId(R.id.select_preset_button))
+      .check(matches(withText(R.string.select_preset)))
+      .perform(click())
+
+    onView(withText(R.string.preset_info__description))
+      .check(matches(isDisplayed()))
+  }
+
+  @Test
+  fun testSetTimer() {
+    val savedPreset = mockk<Preset>(relaxed = true) {
+      every { id } returns "test-id-1"
+      every { name } returns "test-1"
+    }
+
+    every { mockPresetRepository.get("test-id-1") } returns savedPreset
+    every { mockPresetRepository.list() } returns arrayOf(
+      savedPreset,
+      mockk(relaxed = true) {
+        every { id } returns "test-id-2"
+        every { name } returns "test-2"
+      }
+    )
+
+
+    onView(withId(R.id.select_preset_button))
+      .perform(click())
+
+    onView(withId(android.R.id.list))
+      .check(matches(withChild(withText("test-1"))))
+      .check(matches(withChild(withText("test-2"))))
+
+    onView(withText("test-1"))
+      .perform(click())
+
+    onView(withId(R.id.select_preset_button))
+      .check(matches(withText("test-1")))
+
+    verify(exactly = 0) { WakeUpTimerManager.set(any(), any()) }
+
+    onView(withId(R.id.time_picker))
+      .perform(PickerActions.setTime(1, 2))
+
+    onView(withId(R.id.set_time_button))
+      .check(matches(isEnabled()))
+      .perform(scrollTo(), click())
+
+    val calendar = Calendar.getInstance()
+    val timerSlot = slot<WakeUpTimerManager.Timer>()
+
+    try {
+      verify(exactly = 1) {
+        WakeUpTimerManager.set(any(), capture(timerSlot))
+        mockReviewFlowProvider.maybeAskForReview(any())
+      }
+    } finally {
+      clearMocks(WakeUpTimerManager, mockReviewFlowProvider)
+    }
+
+    calendar.timeInMillis = timerSlot.captured.atMillis
+    assertEquals(1, calendar.get(Calendar.HOUR_OF_DAY))
+    assertEquals(2, calendar.get(Calendar.MINUTE))
+    assertEquals("test-id-1", timerSlot.captured.presetID)
+
+    onView(withId(R.id.reset_time_button)).check(matches(isEnabled()))
+    onView(withSubstring("The alarm will go off in"))
+      .check(matches(isDisplayed()))
+  }
+
+  @Test
+  fun testCancelTimer() {
+    every { mockPresetRepository.get("test-id") } returns mockk {
+      every { name } returns "test-name"
+    }
+
+    every { WakeUpTimerManager.get(any()) } returns mockk {
+      every { presetID } returns "test-id"
+      every { atMillis } returns System.currentTimeMillis() + 10000L
+    }
+
+    fragmentScenario.recreate()
+    clearMocks(WakeUpTimerManager)
+    onView(withId(R.id.reset_time_button))
+      .check(matches(isEnabled()))
+      .perform(scrollTo(), click())
+
+    verify(exactly = 1) { WakeUpTimerManager.cancel(any()) }
+  }
+
+  @Test
+  fun testLoadPreset() {
+    val savedPresetID = "test-saved-preset-id"
+    val savedPreset = mockk<Preset>(relaxed = true) {
+      every { id } returns savedPresetID
+      every { name } returns "test-saved-preset"
+    }
+
+    every { mockPresetRepository.list() } returns arrayOf(
+      mockk(relaxed = true) {
+        every { id } returns "test-not-saved-preset-id-1"
+        every { name } returns "test-not-saved-preset-1"
+      },
+      savedPreset,
+      mockk(relaxed = true) {
+        every { id } returns "test-not-saved-preset-id-2"
+        every { name } returns "test-not-saved-preset-2"
+      }
+    )
+
+    every { WakeUpTimerManager.getLastUsedPresetID(any()) } returns savedPresetID
+    every { mockPresetRepository.get(savedPresetID) } returns savedPreset
+
+    fragmentScenario.recreate()
+    onView(withId(R.id.select_preset_button))
+      .check(matches(withText("test-saved-preset")))
+  }
+
+  @Test
+  fun testNotSavedPreset_loadFirstPreset() {
+    val savedPresetID = "test-not-saved-preset-id-1"
+    val savedPreset = mockk<Preset>(relaxed = true) {
+      every { id } returns savedPresetID
+      every { name } returns "test-not-saved-preset-1"
+    }
+
+    every { mockPresetRepository.get(savedPresetID) } returns savedPreset
+    every { mockPresetRepository.list() } returns arrayOf(
+      savedPreset,
+      mockk(relaxed = true) {
+        every { id } returns "test-saved-preset-id"
+        every { name } returns "test-saved-preset"
+      },
+      mockk(relaxed = true) {
+        every { id } returns "test-not-saved-preset-id-2"
+        every { name } returns "test-not-saved-preset-2"
+      }
+    )
+
+    fragmentScenario.recreate()
+    onView(withId(R.id.select_preset_button))
+      .check(matches(withText("test-not-saved-preset-1")))
+  }
+}

app/src/androidTestFull/java/com/github/ashutoshgngwr/noice/GenerateScreenshots.kt

@@ -0,0 +1,250 @@
+package com.github.ashutoshgngwr.noice
+
+import android.content.Context
+import android.content.Intent
+import android.content.res.ColorStateList
+import android.view.Menu
+import android.view.MenuItem
+import androidx.core.content.edit
+import androidx.preference.PreferenceManager
+import androidx.recyclerview.widget.RecyclerView
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.espresso.Espresso.onView
+import androidx.test.espresso.Espresso.openActionBarOverflowOrOptionsMenu
+import androidx.test.espresso.action.ViewActions.click
+import androidx.test.espresso.action.ViewActions.scrollTo
+import androidx.test.espresso.contrib.PickerActions
+import androidx.test.espresso.contrib.RecyclerViewActions.actionOnItem
+import androidx.test.espresso.contrib.RecyclerViewActions.actionOnItemAtPosition
+import androidx.test.espresso.matcher.ViewMatchers
+import androidx.test.espresso.matcher.ViewMatchers.withId
+import androidx.test.espresso.matcher.ViewMatchers.withText
+import androidx.test.ext.junit.rules.ActivityScenarioRule
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.platform.app.InstrumentationRegistry
+import com.github.ashutoshgngwr.noice.activity.AppIntroActivity
+import com.github.ashutoshgngwr.noice.activity.MainActivity
+import com.github.ashutoshgngwr.noice.fragment.PresetsFragment
+import com.github.ashutoshgngwr.noice.playback.Player
+import io.mockk.every
+import io.mockk.mockk
+import org.hamcrest.Matchers.allOf
+import org.junit.After
+import org.junit.AfterClass
+import org.junit.Assume.assumeNotNull
+import org.junit.BeforeClass
+import org.junit.ClassRule
+import org.junit.Rule
+import org.junit.Test
+import org.junit.rules.TestRule
+import org.junit.runner.RunWith
+import org.junit.runners.model.Statement
+import tools.fastlane.screengrab.Screengrab
+import tools.fastlane.screengrab.cleanstatusbar.CleanStatusBar
+import tools.fastlane.screengrab.locale.LocaleTestRule
+
+@RunWith(AndroidJUnit4::class)
+class GenerateScreenshots {
+
+  companion object {
+    private const val IS_SCREENGRAB = "is_screengrab"
+    private const val SLEEP_PERIOD_BEFORE_SCREENGRAB = 500L
+
+    @JvmField
+    @ClassRule
+    val localeTestRule = LocaleTestRule()
+
+    @JvmStatic
+    @BeforeClass
+    fun setupAll() {
+      CleanStatusBar.enableWithDefaults()
+
+      // prevent app intro and data consent from showing up
+      PreferenceManager.getDefaultSharedPreferences(ApplicationProvider.getApplicationContext())
+        .edit {
+          clear() // clear any existing preferences.
+          putBoolean(AppIntroActivity.PREF_HAS_USER_SEEN_APP_INTRO, true)
+          putBoolean(MainActivity.PREF_HAS_SEEN_DATA_COLLECTION_CONSENT, true)
+        }
+    }
+
+    @JvmStatic
+    @AfterClass
+    fun teardownAll() {
+      CleanStatusBar.disable()
+
+      // clear saved presets
+      PreferenceManager.getDefaultSharedPreferences(ApplicationProvider.getApplicationContext())
+        .edit { clear() }
+    }
+  }
+
+  @JvmField
+  @Rule
+  var activityScenarioRule = ActivityScenarioRule(MainActivity::class.java)
+
+  @Rule
+  @JvmField
+  val screenshotRule = TestRule { base, _ ->
+    object : Statement() {
+      override fun evaluate() {
+        // Screengrabfile passes the following launch argument. The tests in this call won't run
+        // otherwise.
+        assumeNotNull(InstrumentationRegistry.getArguments().getString(IS_SCREENGRAB))
+        base.evaluate()
+      }
+    }
+  }
+
+  @After
+  fun after() {
+    activityScenarioRule.scenario.onActivity {
+      it.stopService(Intent(it, MediaPlayerService::class.java))
+    }
+  }
+
+  @Test
+  fun library() {
+    // add a fake Cast button since we can't make the real one appear on an emulator.
+    ApplicationProvider.getApplicationContext<NoiceApplication>().castAPIProvider =
+      mockk(relaxed = true) {
+        every { addMenuItem(any(), any(), any()) } answers {
+          secondArg<Menu>().add("fake-cast-button").apply {
+            setShowAsActionFlags(MenuItem.SHOW_AS_ACTION_ALWAYS)
+            setIcon(R.drawable.cast_ic_notification_small_icon)
+            iconTintList = ColorStateList.valueOf(
+              ApplicationProvider.getApplicationContext<Context>()
+                .getColor(R.color.action_menu_item)
+            )
+          }
+        }
+      }
+
+    activityScenarioRule.scenario.recreate()
+    onView(withId(R.id.sound_list)).perform(
+      actionOnItem<RecyclerView.ViewHolder>(
+        ViewMatchers.hasDescendant(allOf(withId(R.id.title), withText(R.string.light_rain))),
+        click()
+      )
+    )
+
+    onView(withId(R.id.sound_list)).perform(
+      actionOnItem<RecyclerView.ViewHolder>(
+        ViewMatchers.hasDescendant(allOf(withId(R.id.title), withText(R.string.light_rain))),
+        EspressoX.clickInItem(R.id.volume_button)
+      )
+    )
+
+    onView(withId(R.id.volume_slider))
+      .perform(EspressoX.slide(Player.MAX_VOLUME.toFloat() - Player.DEFAULT_VOLUME))
+
+    onView(withId(R.id.positive))
+      .perform(click())
+
+    onView(withId(R.id.sound_list)).perform(
+      actionOnItem<RecyclerView.ViewHolder>(
+        ViewMatchers.hasDescendant(
+          allOf(withId(R.id.title), withText(R.string.distant_thunder))
+        ),
+        click()
+      )
+    )
+
+    onView(withId(R.id.sound_list)).perform(
+      actionOnItem<RecyclerView.ViewHolder>(
+        ViewMatchers.hasDescendant(allOf(withId(R.id.title), withText(R.string.distant_thunder))),
+        EspressoX.clickInItem(R.id.volume_button)
+      )
+    )
+
+    onView(withId(R.id.volume_slider))
+      .perform(EspressoX.slide(Player.MAX_VOLUME.toFloat()))
+
+    onView(withId(R.id.positive))
+      .perform(click())
+
+    onView(withId(R.id.sound_list)).perform(
+      actionOnItem<RecyclerView.ViewHolder>(
+        ViewMatchers.hasDescendant(allOf(withId(R.id.title), withText(R.string.distant_thunder))),
+        EspressoX.clickInItem(R.id.time_period_button)
+      )
+    )
+
+    onView(withId(R.id.time_period_slider))
+      .perform(EspressoX.slide(Player.MAX_TIME_PERIOD.toFloat() - 300))
+
+    onView(withId(R.id.positive))
+      .perform(click())
+
+    Thread.sleep(SLEEP_PERIOD_BEFORE_SCREENGRAB)
+    Screengrab.screenshot("1")
+  }
+
+  @Test
+  fun presets() {
+    onView(withId(R.id.presets)).perform(click())
+    onView(withId(R.id.list))
+      .perform(
+        actionOnItemAtPosition<PresetsFragment.ViewHolder>(
+          1, EspressoX.clickInItem(R.id.play_button)
+        )
+      )
+
+    Thread.sleep(SLEEP_PERIOD_BEFORE_SCREENGRAB)
+    Screengrab.screenshot("2")
+  }
+
+  @Test
+  fun wakeUpTimer() {
+    // cancel any previous alarms
+    WakeUpTimerManager.cancel(ApplicationProvider.getApplicationContext())
+
+    onView(withId(R.id.wake_up_timer)).perform(click())
+
+    onView(withId(R.id.time_picker))
+      .perform(PickerActions.setTime(12, 30))
+
+    onView(withId(R.id.set_time_button))
+      .perform(scrollTo(), click())
+
+    onView(withText(R.string.wake_up_timer_description))
+      .perform(scrollTo())
+
+    Thread.sleep(SLEEP_PERIOD_BEFORE_SCREENGRAB)
+    Screengrab.screenshot("3")
+  }
+
+  @Test
+  fun sleepTimer() {
+    onView(withId(R.id.sound_list)).perform(
+      actionOnItem<RecyclerView.ViewHolder>(
+        ViewMatchers.hasDescendant(allOf(withId(R.id.title), withText(R.string.birds))),
+        click()
+      )
+    )
+
+    onView(withId(R.id.sleep_timer)).perform(click())
+    onView(withId(R.id.duration_picker)).perform(
+      EspressoX.addDurationToPicker(1800)
+    )
+
+    Thread.sleep(SLEEP_PERIOD_BEFORE_SCREENGRAB)
+    Screengrab.screenshot("4")
+  }
+
+  @Test
+  fun about() {
+    openActionBarOverflowOrOptionsMenu(ApplicationProvider.getApplicationContext())
+    onView(withText(R.string.about)).perform(click())
+    Thread.sleep(SLEEP_PERIOD_BEFORE_SCREENGRAB)
+    Screengrab.screenshot("5")
+  }
+
+  @Test
+  fun settingsItem() {
+    openActionBarOverflowOrOptionsMenu(ApplicationProvider.getApplicationContext())
+    onView(withText(R.string.settings)).perform(click())
+    Thread.sleep(SLEEP_PERIOD_BEFORE_SCREENGRAB)
+    Screengrab.screenshot("6")
+  }
+}

app/src/debug/AndroidManifest.xml

@@ -0,0 +1,31 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+  xmlns:tools="http://schemas.android.com/tools">
+
+  <!-- screengrab-permissions -->
+
+  <!-- Allows unlocking your device and activating its screen so UI tests can succeed -->
+  <uses-permission android:name="android.permission.DISABLE_KEYGUARD" />
+  <uses-permission android:name="android.permission.WAKE_LOCK" />
+
+  <!-- Allows for storing and retrieving screenshots -->
+  <uses-permission
+    android:name="android.permission.WRITE_EXTERNAL_STORAGE"
+    android:maxSdkVersion="18" />
+
+  <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+
+  <!-- Allows changing locales -->
+  <uses-permission
+    android:name="android.permission.CHANGE_CONFIGURATION"
+    tools:ignore="ProtectedPermissions" />
+
+  <!-- Allows changing SystemUI demo mode -->
+  <uses-permission
+    android:name="android.permission.DUMP"
+    tools:ignore="ProtectedPermissions" />
+
+  <!-- /screengrab-permissions -->
+
+  <application tools:ignore="AllowBackup" />
+
+</manifest>

app/src/full/AndroidManifest.xml

@@ -0,0 +1,39 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+  xmlns:tools="http://schemas.android.com/tools">
+
+  <application
+    android:name="com.github.ashutoshgngwr.noice.FullNoiceApplication"
+    tools:ignore="AllowBackup"
+    tools:replace="name">
+
+    <meta-data
+      android:name="com.google.android.gms.cast.framework.OPTIONS_PROVIDER_CLASS_NAME"
+      android:value="com.github.ashutoshgngwr.noice.provider.CastOptionsProvider" />
+
+    <meta-data
+      android:name="firebase_crashlytics_collection_enabled"
+      android:value="false" />
+
+    <meta-data
+      android:name="firebase_analytics_collection_enabled"
+      android:value="false" />
+
+    <meta-data
+      android:name="google_analytics_adid_collection_enabled"
+      android:value="false" />
+
+    <meta-data
+      android:name="google_analytics_ssaid_collection_enabled"
+      android:value="false" />
+
+    <meta-data
+      android:name="google_analytics_default_allow_ad_personalization_signals"
+      android:value="false" />
+
+    <meta-data
+      android:name="google_analytics_automatic_screen_reporting_enabled"
+      android:value="false" />
+
+  </application>
+
+</manifest>

app/src/full/java/com/github/ashutoshgngwr/noice/FullNoiceApplication.kt

@@ -0,0 +1,41 @@
+package com.github.ashutoshgngwr.noice
+
+import com.github.ashutoshgngwr.noice.provider.InAppBillingDonateViewProvider
+import com.github.ashutoshgngwr.noice.provider.PlaystoreReviewFlowProvider
+import com.github.ashutoshgngwr.noice.provider.RealAnalyticsProvider
+import com.github.ashutoshgngwr.noice.provider.RealBillingProvider
+import com.github.ashutoshgngwr.noice.provider.RealCastAPIProvider
+import com.github.ashutoshgngwr.noice.provider.RealCrashlyticsProvider
+import com.google.android.gms.common.ConnectionResult
+import com.google.android.gms.common.GoogleApiAvailability
+import com.google.firebase.FirebaseApp
+
+
+@Suppress("unused")
+class FullNoiceApplication : NoiceApplication() {
+
+  override fun initProviders() {
+    super.initProviders()
+    FirebaseApp.initializeApp(this)
+
+    // crashlytics and analytics doesn't require Google Mobile Services to work.
+    crashlyticsProvider = RealCrashlyticsProvider
+    analyticsProvider = RealAnalyticsProvider
+
+    if (isGoogleMobileServicesAvailable()) {
+      castAPIProvider = RealCastAPIProvider(this)
+      reviewFlowProvider = PlaystoreReviewFlowProvider
+      billingProvider = RealBillingProvider
+      donateViewProvider = InAppBillingDonateViewProvider
+    }
+  }
+
+  override fun isGoogleMobileServicesAvailable(): Boolean {
+    val result = GoogleApiAvailability.getInstance().isGooglePlayServicesAvailable(this)
+    if (result != ConnectionResult.SUCCESS) {
+      return super.isGoogleMobileServicesAvailable()
+    }
+
+    return true
+  }
+}

app/src/full/java/com/github/ashutoshgngwr/noice/playback/strategy/CastPlaybackStrategy.kt

@@ -0,0 +1,76 @@
+package com.github.ashutoshgngwr.noice.playback.strategy
+
+import android.content.Context
+import androidx.media.AudioAttributesCompat
+import com.github.ashutoshgngwr.noice.model.Sound
+import com.github.ashutoshgngwr.noice.repository.SettingsRepository
+import com.google.android.gms.cast.framework.CastSession
+import com.google.gson.GsonBuilder
+import com.google.gson.annotations.Expose
+
+/**
+ * [CastPlaybackStrategy] implements [PlaybackStrategy] that sends the control events
+ * to the cast receiver application.
+ */
+class CastPlaybackStrategy(
+  context: Context,
+  private val session: CastSession,
+  private val namespace: String,
+  private val sound: Sound
+) : PlaybackStrategy {
+
+  companion object {
+    private const val ACTION_CREATE = "create"
+    private const val ACTION_PLAY = "play"
+    private const val ACTION_PAUSE = "pause"
+    private const val ACTION_STOP = "stop"
+  }
+
+  @Suppress("unused")
+  private class PlayerEvent(
+    @Expose val src: Array<String>,
+    @Expose val isLooping: Boolean,
+    @Expose val volume: Float,
+    @Expose val action: String?,
+    @Expose val fadeInDuration: Long,
+  )
+
+  var volume: Float = 0.0f
+    private set
+
+  private val gson = GsonBuilder().excludeFieldsWithoutExposeAnnotation().create()
+  private val settingsRepository = SettingsRepository.newInstance(context)
+
+  init {
+    notifyChanges(ACTION_CREATE)
+  }
+
+  override fun setVolume(volume: Float) {
+    if (this.volume == volume) {
+      return
+    }
+
+    this.volume = volume
+    notifyChanges(null)
+  }
+
+  override fun play() {
+    notifyChanges(ACTION_PLAY)
+  }
+
+  override fun pause() {
+    notifyChanges(ACTION_PAUSE)
+  }
+
+  override fun stop() {
+    notifyChanges(ACTION_STOP)
+  }
+
+  override fun setAudioAttributes(attrs: AudioAttributesCompat) = Unit
+
+  private fun notifyChanges(action: String?) {
+    val fadeInDuration = settingsRepository.getSoundFadeInDurationMillis()
+    val event = PlayerEvent(sound.src, sound.isLooping, volume, action, fadeInDuration)
+    session.sendMessage(namespace, gson.toJson(event))
+  }
+}

app/src/full/java/com/github/ashutoshgngwr/noice/playback/strategy/CastPlaybackStrategyFactory.kt

@@ -0,0 +1,21 @@
+package com.github.ashutoshgngwr.noice.playback.strategy
+
+import android.content.Context
+import com.github.ashutoshgngwr.noice.model.Sound
+import com.google.android.gms.cast.framework.CastSession
+
+
+/**
+ * A [PlaybackStrategyFactory] for creating [PlaybackStrategy] instances that cast media using the Google
+ * Cast application framework.
+ */
+class CastPlaybackStrategyFactory internal constructor(
+  private val context: Context,
+  private val session: CastSession,
+  private val namespace: String
+) : PlaybackStrategyFactory {
+
+  override fun newInstance(sound: Sound): PlaybackStrategy {
+    return CastPlaybackStrategy(context, session, namespace, sound)
+  }
+}

app/src/full/java/com/github/ashutoshgngwr/noice/provider/InAppBillingDonateViewProvider.kt

@@ -0,0 +1,11 @@
+package com.github.ashutoshgngwr.noice.provider
+
+import android.view.ViewGroup
+import com.github.ashutoshgngwr.noice.widget.InAppBillingDonateView
+
+object InAppBillingDonateViewProvider : DonateViewProvider {
+
+  override fun addViewToParent(parent: ViewGroup) {
+    parent.addView(InAppBillingDonateView(parent.context))
+  }
+}

app/src/full/java/com/github/ashutoshgngwr/noice/provider/PlaystoreReviewFlowProvider.kt

@@ -0,0 +1,81 @@
+package com.github.ashutoshgngwr.noice.provider
+
+import android.content.Context
+import android.util.Log
+import androidx.annotation.VisibleForTesting
+import androidx.core.content.edit
+import androidx.fragment.app.FragmentActivity
+import androidx.preference.PreferenceManager
+import com.google.android.play.core.review.ReviewInfo
+import com.google.android.play.core.review.ReviewManager
+import com.google.android.play.core.review.ReviewManagerFactory
+import java.util.concurrent.TimeUnit
+
+/**
+ * [PlaystoreReviewFlowProvider] provides the Google Play Store In-App review flow. The review flow
+ * will not always be shown. All original quota restrictions apply from the API. Additionally
+ * [PlaystoreReviewFlowProvider] drops all request to display review flow within a week of a
+ * successful launch review flow API call (without guarantees that the flow was shown).
+ */
+object PlaystoreReviewFlowProvider : ReviewFlowProvider {
+  private val TAG = this::class.simpleName
+
+  @VisibleForTesting(otherwise = VisibleForTesting.PRIVATE)
+  const val PREF_LAST_SHOWN_ON = "last_shown_on"
+
+  private lateinit var reviewManager: ReviewManager
+  private lateinit var reviewInfo: ReviewInfo
+
+  /**
+   * [init] initializes the [ReviewManager] and requests the [ReviewInfo] from the [ReviewManager].
+   */
+  override fun init(context: Context) {
+    reviewManager = ReviewManagerFactory.create(context)
+    reviewManager.requestReviewFlow()
+      .addOnFailureListener {
+        Log.w(TAG, "review flow request failed!", it)
+      }.addOnSuccessListener {
+        Log.d(TAG, "review flow request successful!")
+        reviewInfo = it
+      }
+  }
+
+  /**
+   * [maybeAskForReview] checks whether [ReviewInfo] has been initialized and whether user has
+   * successfully completed the review flow within past 7 days. If both conditions are false,
+   * it requests the Google Play API to launch the review flow.
+   */
+  override fun maybeAskForReview(activity: FragmentActivity) {
+    if (!this::reviewInfo.isInitialized) {
+      Log.d(TAG, "review info isn't initialized. can not launch review flow!")
+      return
+    }
+
+    if (isShownWithinLastWeek(activity)) {
+      Log.d(TAG, "review flow was shown within last week. abandoning request!")
+      return
+    }
+
+    reviewManager.launchReviewFlow(activity, reviewInfo)
+      .addOnFailureListener {
+        Log.w(TAG, "failed to complete review flow!", it)
+      }
+      .addOnSuccessListener {
+        Log.d(TAG, "review flow successfully completed!")
+        updateLastSeenTimestamp(activity)
+      }
+  }
+
+  private fun updateLastSeenTimestamp(context: Context) {
+    PreferenceManager.getDefaultSharedPreferences(context).edit {
+      putLong(PREF_LAST_SHOWN_ON, System.currentTimeMillis())
+    }
+  }
+
+  private fun isShownWithinLastWeek(context: Context): Boolean {
+    val timestamp = PreferenceManager.getDefaultSharedPreferences(context)
+      .getLong(PREF_LAST_SHOWN_ON, 0)
+
+    return TimeUnit.DAYS.toMillis(7L) + timestamp > System.currentTimeMillis()
+  }
+}

app/src/full/java/com/github/ashutoshgngwr/noice/provider/RealAnalyticsProvider.kt

@@ -0,0 +1,83 @@
+package com.github.ashutoshgngwr.noice.provider
+
+import android.os.Bundle
+import androidx.core.os.bundleOf
+import com.google.firebase.analytics.FirebaseAnalytics
+import com.google.firebase.analytics.ktx.analytics
+import com.google.firebase.analytics.ktx.setConsent
+import com.google.firebase.ktx.Firebase
+import kotlin.reflect.KClass
+
+/**
+ * [RealAnalyticsProvider] provides a real concrete implementation of the Firebase Analytics API.
+ */
+object RealAnalyticsProvider : AnalyticsProvider {
+
+  private val fa = Firebase.analytics
+  private val playerStartTimes = mutableMapOf<String, Long>()
+
+  private var playbackStartTime = -1L
+  private var castSessionStartTime = -1L
+
+  init {
+    fa.setConsent {
+      adStorage = FirebaseAnalytics.ConsentStatus.DENIED
+      analyticsStorage = FirebaseAnalytics.ConsentStatus.GRANTED
+    }
+  }
+
+  override fun setCollectionEnabled(e: Boolean) {
+    fa.setAnalyticsCollectionEnabled(e)
+  }
+
+  override fun setCurrentScreen(name: String, clazz: KClass<out Any>, params: Bundle) {
+    params.putString(FirebaseAnalytics.Param.SCREEN_NAME, name)
+    clazz.simpleName?.also {
+      params.putString(FirebaseAnalytics.Param.SCREEN_CLASS, it)
+    }
+
+    fa.logEvent(FirebaseAnalytics.Event.SCREEN_VIEW, params)
+  }
+
+
+  override fun logEvent(name: String, params: Bundle) {
+    fa.logEvent(name, params)
+  }
+
+  override fun logPlayerStartEvent(key: String) {
+    if (key !in playerStartTimes) {
+      playerStartTimes[key] = System.currentTimeMillis()
+    }
+
+    if (playbackStartTime <= 0) {
+      playbackStartTime = System.currentTimeMillis()
+    }
+  }
+
+  override fun logPlayerStopEvent(key: String) {
+    playerStartTimes.remove(key)?.also {
+      val params = bundleOf("sound_key" to key, "duration_ms" to System.currentTimeMillis() - it)
+      fa.logEvent("sound_session", params)
+    }
+
+    if (playerStartTimes.isEmpty() && playbackStartTime > 0) {
+      val duration = System.currentTimeMillis() - playbackStartTime
+      fa.logEvent("playback_session", bundleOf("duration_ms" to duration))
+      playbackStartTime = -1L
+    }
+  }
+
+  override fun logCastSessionStartEvent() {
+    castSessionStartTime = System.currentTimeMillis()
+  }
+
+  override fun logCastSessionEndEvent() {
+    if (castSessionStartTime <= 0) {
+      return
+    }
+
+    val params = bundleOf("duration_ms" to System.currentTimeMillis() - castSessionStartTime)
+    fa.logEvent("cast_session", params)
+    castSessionStartTime = -1
+  }
+}

app/src/full/java/com/github/ashutoshgngwr/noice/provider/RealBillingProvider.kt

@@ -0,0 +1,379 @@
+package com.github.ashutoshgngwr.noice.provider
+
+import android.app.Activity
+import android.content.Context
+import android.content.SharedPreferences
+import android.os.Handler
+import android.os.Looper
+import android.util.Base64
+import android.util.Log
+import androidx.annotation.VisibleForTesting
+import androidx.core.content.edit
+import androidx.core.os.HandlerCompat
+import com.android.billingclient.api.AcknowledgePurchaseParams
+import com.android.billingclient.api.BillingClient
+import com.android.billingclient.api.BillingClientStateListener
+import com.android.billingclient.api.BillingFlowParams
+import com.android.billingclient.api.BillingResult
+import com.android.billingclient.api.ConsumeParams
+import com.android.billingclient.api.Purchase
+import com.android.billingclient.api.SkuDetails
+import com.android.billingclient.api.SkuDetailsParams
+import com.android.billingclient.api.consumePurchase
+import com.android.billingclient.api.querySkuDetails
+import com.github.ashutoshgngwr.noice.ext.getMutableStringSet
+import kotlinx.coroutines.CoroutineName
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.cancel
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.suspendCancellableCoroutine
+import kotlinx.coroutines.sync.Mutex
+import kotlinx.coroutines.sync.withLock
+import java.security.KeyFactory
+import java.security.PublicKey
+import java.security.Signature
+import java.security.SignatureException
+import java.security.spec.X509EncodedKeySpec
+import java.util.concurrent.atomic.AtomicBoolean
+import kotlin.coroutines.resumeWithException
+
+/**
+ * [RealBillingProvider] implements a thin wrapper around Google Play Billing v4 client library. It
+ * auto-acknowledges new purchases. It also handles state transition of pending purchases.
+ */
+object RealBillingProvider : BillingProvider, BillingClientStateListener {
+
+  private const val GOOGLE_PLAY_SECURITY_KEY = "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAkxR84" +
+    "yP6PFaAFqhgVtFzI4O1Ws/xFQjJOhKCCrnyfs59SXSLsSbWjdMikCB7xcJsSkhfsril5iK88UIKhBLUW3oe16LO7YMOS" +
+    "6xeH0s0LdxHnF1rdwr0WtFc41CjGFIMWFxkB27jft97Ycp72cASjmU3K/Jc0a2Qo3thrpZlJN+vwRzveaVUE73o/Fyzd" +
+    "Uqyu4e8IngKOXDqxkgz3XLmzTHsx6XmeLTQl1WFMhOi5FxoHD9AHVoyZzbkGCMdRJERvk+ziSXdGR9pRUtGVkv+h5v3f" +
+    "wfVqBYZC28TAz5w6wSRDFvUnIp52nQH52vdHf1mrwHbeniMUJzV5GoBaspTqQIDAQAB"
+
+  @VisibleForTesting
+  internal const val PREF_NAME = "RealBillingProviderPreferences"
+
+  @VisibleForTesting
+  internal const val PREF_UNCONSUMED_ORDERS = "unconsumed_orders"
+  private const val PREF_PENDING_ORDERS = "pending_orders"
+
+  private const val COROUTINE_SCOPE_NAME = "RealBillingProviderScope"
+  private val LOG_TAG = this::class.simpleName
+
+  private const val RECONNECT_DELAY_MS = 2L * 1000L + 500L
+  private const val RECONNECT_MAX_COUNT = 10
+  private val RECONNECT_CALLBACK_TOKEN = "${this::class.qualifiedName}.reconnectCallback"
+
+  private lateinit var client: BillingClient
+  private lateinit var prefs: SharedPreferences
+  private lateinit var defaultScope: CoroutineScope
+
+  private var purchaseListener: BillingProvider.PurchaseListener? = null
+  private var reconnectCount = 0
+
+  private val prefsMutex = Mutex()
+  private val handler = Handler(Looper.getMainLooper())
+  private val isConnecting = AtomicBoolean(false)
+  private val securityKey: PublicKey
+
+  init {
+    val decodedKey = Base64.decode(GOOGLE_PLAY_SECURITY_KEY, Base64.DEFAULT)
+    securityKey = KeyFactory.getInstance("RSA")
+      .generatePublic(X509EncodedKeySpec(decodedKey))
+  }
+
+  override fun onBillingSetupFinished(result: BillingResult) {
+    if (result.responseCode != BillingClient.BillingResponseCode.OK) {
+      Log.w(LOG_TAG, "billing service connection failed: ${result.debugMessage}")
+      retryServiceConnection()
+      return
+    }
+
+    Log.d(LOG_TAG, "billing service connected")
+    isConnecting.set(false)
+    reconnectCount = 0
+    refreshPurchases()
+  }
+
+  override fun onBillingServiceDisconnected() = retryServiceConnection()
+
+  /**
+   * Implements service connection retry with constant delay [RECONNECT_DELAY_MS].
+   */
+  private fun retryServiceConnection() {
+    if (reconnectCount >= RECONNECT_MAX_COUNT) {
+      isConnecting.set(false)
+      reconnectCount = 0
+      return
+    }
+
+    HandlerCompat.postDelayed(
+      handler, { client.startConnection(this) },
+      RECONNECT_CALLBACK_TOKEN, RECONNECT_DELAY_MS,
+    )
+
+    reconnectCount++
+  }
+
+  override fun init(context: Context, listener: BillingProvider.PurchaseListener?) {
+    purchaseListener = listener
+    defaultScope = CoroutineScope(Job() + CoroutineName(COROUTINE_SCOPE_NAME))
+
+    client = BillingClient.newBuilder(context)
+      .enablePendingPurchases()
+      .setListener { _, _ -> refreshPurchases() }
+      .build()
+
+    prefs = context.getSharedPreferences(PREF_NAME, Context.MODE_PRIVATE)
+
+    Log.d(LOG_TAG, "init: startConnection")
+    isConnecting.set(true)
+    client.startConnection(this)
+  }
+
+  override fun close() {
+    handler.removeCallbacksAndMessages(RECONNECT_CALLBACK_TOKEN)
+    client.endConnection()
+    defaultScope.cancel()
+    Log.d(LOG_TAG, "close: end connection")
+  }
+
+  /**
+   * Query details of given [skus].
+   *
+   * @return List of [BillingProvider.SkuDetails] for provided [skus].
+   * @throws BillingProvider.QueryDetailsException when the query fails.
+   */
+  @Throws(BillingProvider.QueryDetailsException::class)
+  override suspend fun queryDetails(
+    type: BillingProvider.SkuType,
+    skus: List<String>
+  ): List<BillingProvider.SkuDetails> {
+    waitForBillingClientConnection()
+    if (!client.isReady) {
+      throw BillingProvider.QueryDetailsException("billing client is not ready")
+    }
+
+    val p = SkuDetailsParams.newBuilder()
+      .setSkusList(skus)
+      .setType(type.value)
+      .build()
+
+    val r = client.querySkuDetails(p)
+    if (r.billingResult.responseCode != BillingClient.BillingResponseCode.OK) {
+      throw BillingProvider.QueryDetailsException(r.billingResult.debugMessage)
+    }
+
+    return r.skuDetailsList?.map {
+      BillingProvider.SkuDetails(it.price, it.priceAmountMicros, it.originalJson)
+    } ?: throw BillingProvider.QueryDetailsException("sku details list is null")
+  }
+
+  /**
+   * Launch billing flow for the given [sku].
+   */
+  override fun purchase(activity: Activity, sku: BillingProvider.SkuDetails): Boolean {
+    val params = BillingFlowParams.newBuilder()
+      .setSkuDetails(SkuDetails(sku.originalJSON))
+      .build()
+
+    val result = client.launchBillingFlow(activity, params)
+    if (result.responseCode != BillingClient.BillingResponseCode.OK) {
+      Log.w(LOG_TAG, "failed to start billing flow: ${result.debugMessage}")
+      return false
+    }
+
+    return true
+  }
+
+  override fun consumePurchase(orderId: String) {
+    defaultScope.launch(Dispatchers.IO) {
+      prefsMutex.withLock {
+        val orders = prefs.getMutableStringSet(PREF_UNCONSUMED_ORDERS)
+        orders.add(orderId)
+        prefs.edit(commit = true) { putStringSet(PREF_UNCONSUMED_ORDERS, orders) }
+        Log.d(LOG_TAG, "consumePurchase: add to unconsumed orders")
+      }
+
+      refreshPurchases()
+    }
+  }
+
+  private fun refreshPurchases() {
+    defaultScope.launch(Dispatchers.IO) {
+      waitForBillingClientConnection()
+
+      if (!client.isReady) {
+        Log.d(LOG_TAG, "refreshPurchases: client is not ready")
+      } else {
+        reconcilePurchases()
+      }
+    }
+  }
+
+  @VisibleForTesting
+  internal suspend fun reconcilePurchases(verifyPurchases: Boolean = true) = prefsMutex.withLock {
+    val purchases: List<Purchase>
+    try {
+      purchases = queryPurchases()
+    } catch (e: QueryPurchasesException) {
+      Log.w(LOG_TAG, "reconcilePurchases: query purchase failed", e)
+      return
+    }
+
+    val pendingOrders = prefs.getMutableStringSet(PREF_PENDING_ORDERS)
+    val unconsumedOrders = prefs.getMutableStringSet(PREF_UNCONSUMED_ORDERS)
+
+    for (p in purchases) {
+      if (verifyPurchases && !isVerifiedPurchase(p)) {
+        continue
+      }
+
+      if (p.purchaseState == Purchase.PurchaseState.PENDING && pendingOrders.add(p.orderId)) {
+        Log.d(LOG_TAG, "reconcilePurchases: new pending order skus=${p.skus}")
+        defaultScope.launch(Dispatchers.Main) { purchaseListener?.onPending(p.skus) }
+      }
+
+      if (p.purchaseState == Purchase.PurchaseState.PURCHASED && !p.isAcknowledged) {
+        pendingOrders.remove(p.orderId)
+        Log.d(LOG_TAG, "reconcilePurchases: new purchased order skus=${p.skus}")
+        try {
+          acknowledgePurchase(p.purchaseToken)
+          Log.d(LOG_TAG, "reconcilePurchases: acknowledged skus=${p.skus}")
+          defaultScope.launch(Dispatchers.Main) {
+            purchaseListener?.onComplete(p.skus, p.orderId)
+          }
+        } catch (e: AcknowledgePurchaseException) {
+          Log.w(LOG_TAG, "reconcilePurchases: acknowledge purchase failed", e)
+        }
+      }
+
+      // consume marked purchases.
+      if (p.purchaseState == Purchase.PurchaseState.PURCHASED && p.orderId in unconsumedOrders) {
+        try {
+          consumePurchaseAsync(p.purchaseToken)
+          unconsumedOrders.remove(p.orderId)
+          Log.d(LOG_TAG, "reconcilePurchases: consumed skus=${p.skus}")
+        } catch (e: ConsumePurchaseException) {
+          Log.w(LOG_TAG, "reconcilePurchases: consume purchase failed", e)
+        }
+      }
+    }
+
+    prefs.edit(commit = true) {
+      putStringSet(PREF_PENDING_ORDERS, pendingOrders)
+      putStringSet(PREF_UNCONSUMED_ORDERS, unconsumedOrders)
+    }
+  }
+
+  private suspend fun waitForBillingClientConnection() {
+    while (isConnecting.get()) {
+      delay(500)
+    }
+  }
+
+  /**
+   * Query all purchases.
+   *
+   * @return list of in-app and subscription purchases
+   * @throws QueryPurchasesException when the query fails.
+   */
+  @Throws(QueryPurchasesException::class)
+  private suspend fun queryPurchases(): List<Purchase> {
+    return queryPurchases(BillingClient.SkuType.SUBS) + queryPurchases(BillingClient.SkuType.INAPP)
+  }
+
+  /**
+   * Query purchases of the provided [BillingClient.SkuType] [type].
+   *
+   * @return list of purchases
+   * @throws QueryPurchasesException when the query fails.
+   */
+  @Throws(QueryPurchasesException::class)
+  private suspend fun queryPurchases(@BillingClient.SkuType type: String): List<Purchase> {
+    return suspendCancellableCoroutine { c ->
+      client.queryPurchasesAsync(type) { result, purchaseList ->
+        if (result.responseCode == BillingClient.BillingResponseCode.OK) {
+          c.resume(purchaseList) { e ->
+            Log.d(LOG_TAG, "queryPurchases cancelled", e)
+          }
+        } else {
+          c.resumeWithException(QueryPurchasesException(result.debugMessage))
+        }
+      }
+    }
+  }
+
+  private fun isVerifiedPurchase(p: Purchase): Boolean {
+    if (p.signature.isBlank() || p.originalJson.isBlank()) {
+      return false
+    }
+
+    try {
+      val signatureBytes = Base64.decode(p.signature, Base64.DEFAULT)
+      val signatureAlgorithm = Signature.getInstance("SHA1withRSA")
+      signatureAlgorithm.initVerify(securityKey)
+      signatureAlgorithm.update(p.originalJson.toByteArray())
+
+      if (signatureAlgorithm.verify(signatureBytes)) {
+        return true
+      }
+
+      Log.w(LOG_TAG, "Signature verification failed")
+    } catch (e: IllegalArgumentException) {
+      Log.w(LOG_TAG, "Base64 decoding failed", e)
+    } catch (e: SignatureException) {
+      Log.e(LOG_TAG, "Signature exception", e)
+    }
+
+    return false
+  }
+
+  /**
+   * Acknowledge a new purchase.
+   *
+   * @throws AcknowledgePurchaseException when the acknowledge query fails.
+   */
+  @Throws(AcknowledgePurchaseException::class)
+  private suspend fun acknowledgePurchase(token: String) {
+    return suspendCancellableCoroutine { c ->
+      val params = AcknowledgePurchaseParams.newBuilder()
+        .setPurchaseToken(token)
+        .build()
+
+      client.acknowledgePurchase(params) { result ->
+        if (result.responseCode == BillingClient.BillingResponseCode.OK) {
+          c.resume(Unit) { e ->
+            Log.d(LOG_TAG, "acknowledgePurchase cancelled", e)
+          }
+        } else {
+          c.resumeWithException(AcknowledgePurchaseException(result.debugMessage))
+        }
+      }
+    }
+  }
+
+  /**
+   * Consume an in-app purchase.
+   *
+   * @throws ConsumePurchaseException when the consume query fails.
+   */
+  @Throws(ConsumePurchaseException::class)
+  private suspend fun consumePurchaseAsync(token: String) {
+    val r = client.consumePurchase(
+      ConsumeParams.newBuilder()
+        .setPurchaseToken(token)
+        .build()
+    )
+
+    if (r.billingResult.responseCode != BillingClient.BillingResponseCode.OK) {
+      throw ConsumePurchaseException(r.billingResult.debugMessage)
+    }
+  }
+
+  class QueryPurchasesException(msg: String) : Exception(msg)
+  class AcknowledgePurchaseException(msg: String) : Exception(msg)
+  class ConsumePurchaseException(msg: String) : Exception(msg)
+}

app/src/full/java/com/github/ashutoshgngwr/noice/provider/RealCastAPIProvider.kt

@@ -0,0 +1,166 @@
+package com.github.ashutoshgngwr.noice.provider
+
+import android.content.Context
+import android.view.Menu
+import android.view.MenuItem
+import androidx.annotation.StringRes
+import androidx.annotation.VisibleForTesting
+import androidx.core.view.MenuItemCompat
+import androidx.media.VolumeProviderCompat
+import androidx.mediarouter.app.MediaRouteActionProvider
+import com.github.ashutoshgngwr.noice.BuildConfig
+import com.github.ashutoshgngwr.noice.R
+import com.github.ashutoshgngwr.noice.playback.strategy.CastPlaybackStrategyFactory
+import com.github.ashutoshgngwr.noice.playback.strategy.PlaybackStrategyFactory
+import com.google.android.gms.cast.framework.CastButtonFactory
+import com.google.android.gms.cast.framework.CastContext
+import com.google.android.gms.cast.framework.CastOptions
+import com.google.android.gms.cast.framework.CastSession
+import com.google.android.gms.cast.framework.OptionsProvider
+import com.google.android.gms.cast.framework.SessionManagerListener
+import com.google.android.gms.cast.framework.SessionProvider
+import com.google.android.gms.cast.framework.media.CastMediaOptions
+import kotlin.math.round
+
+/**
+ * [RealCastAPIProvider] wraps all the Google Cast API functionality used by the application
+ * for the full build variant.
+ */
+class RealCastAPIProvider(context: Context) : CastAPIProvider {
+
+  private val sessionListeners = mutableSetOf<CastAPIProvider.SessionListener>()
+
+  private val castContext = CastContext.getSharedInstance(context)
+  private val castSessionManagerListener = object : SessionManagerListener<CastSession> {
+    override fun onSessionStarted(session: CastSession, sessionId: String) {
+      sessionListeners.forEach { it.onSessionBegin() }
+    }
+
+    override fun onSessionResumed(session: CastSession, wasSuspended: Boolean) {
+      sessionListeners.forEach { it.onSessionBegin() }
+    }
+
+    override fun onSessionEnded(session: CastSession, error: Int) {
+      sessionListeners.forEach { it.onSessionEnd() }
+    }
+
+    override fun onSessionResumeFailed(session: CastSession, error: Int) = Unit
+    override fun onSessionSuspended(session: CastSession, reason: Int) = Unit
+    override fun onSessionStarting(session: CastSession) = Unit
+    override fun onSessionResuming(session: CastSession, sessionId: String) = Unit
+    override fun onSessionEnding(session: CastSession) = Unit
+    override fun onSessionStartFailed(session: CastSession, error: Int) = Unit
+  }
+
+  /**
+   * Sets up the cast media menu item on the given menu with given title resource.
+   */
+  override fun addMenuItem(context: Context, menu: Menu, @StringRes titleResId: Int) {
+    menu.add(titleResId).also {
+      it.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM)
+      MenuItemCompat.setActionProvider(it, MediaRouteActionProvider(context))
+      CastButtonFactory.setUpMediaRouteButton(context, menu, it.itemId)
+    }
+  }
+
+  /**
+   * Initializes a new [CastPlaybackStrategyFactory] instance and returns it as
+   * [PlaybackStrategyFactory].
+   */
+  override fun getPlaybackStrategyFactory(context: Context): PlaybackStrategyFactory =
+    CastPlaybackStrategyFactory(
+      context,
+      requireNotNull(castContext.sessionManager.currentCastSession),
+      context.getString(R.string.cast_namespace__default)
+    )
+
+  /**
+   * Creates a new [VolumeProviderCompat] instance that can be used with
+   * [android.support.v4.media.session.MediaSessionCompat.setPlaybackToRemote].
+   */
+  override fun getVolumeProvider(): VolumeProviderCompat =
+    CastVolumeProvider(requireNotNull(castContext.sessionManager.currentCastSession))
+
+  override fun registerSessionListener(listener: CastAPIProvider.SessionListener) {
+    // add `castSessionManagerListener` only when the first `CastAPIProvider.SessionListener` is
+    // registered.
+    if (sessionListeners.isEmpty()) {
+      castContext.sessionManager.addSessionManagerListener(
+        castSessionManagerListener,
+        CastSession::class.java
+      )
+    }
+
+    sessionListeners.add(listener)
+  }
+
+  override fun unregisterSessionListener(listener: CastAPIProvider.SessionListener) {
+    sessionListeners.remove(listener)
+
+    // remove `castSessionManagerListener` when the last `CastAPIProvider.SessionListener` is
+    // unregistered.
+    if (sessionListeners.isEmpty()) {
+      castContext.sessionManager.removeSessionManagerListener(
+        castSessionManagerListener,
+        CastSession::class.java
+      )
+    }
+  }
+}
+
+@Suppress("unused") // Referred from 'AndroidManifest.xml'
+class CastOptionsProvider : OptionsProvider {
+
+  override fun getCastOptions(context: Context): CastOptions {
+    return CastOptions.Builder().run {
+      setReceiverApplicationId(
+        context.getString(
+          @Suppress("ConstantConditionIf")
+          if (BuildConfig.DEBUG) {
+            R.string.cast_app_id__debug
+          } else {
+            R.string.cast_app_id__release
+          }
+        )
+      )
+
+      setStopReceiverApplicationWhenEndingSession(true)
+      setCastMediaOptions(
+        CastMediaOptions.Builder()
+          .setMediaSessionEnabled(false)
+          .build()
+      )
+
+      build()
+    }
+  }
+
+  override fun getAdditionalSessionProviders(context: Context?): List<SessionProvider>? = null
+}
+
+/**
+ * A [VolumeProviderCompat] implementation for adjusting cast device volume using active
+ * [MediaSession][android.support.v4.media.session.MediaSessionCompat]'s remote playback
+ * control.
+ */
+internal class CastVolumeProvider(private val session: CastSession) :
+  VolumeProviderCompat(VOLUME_CONTROL_ABSOLUTE, MAX_VOLUME, multiply(session.volume)) {
+
+  companion object {
+    @VisibleForTesting(otherwise = VisibleForTesting.PRIVATE)
+    const val MAX_VOLUME = 15
+
+    private fun multiply(volume: Double): Int {
+      return round(volume * MAX_VOLUME).toInt()
+    }
+  }
+
+  override fun onSetVolumeTo(volume: Int) {
+    session.volume = volume.toDouble() / MAX_VOLUME
+    this.currentVolume = volume
+  }
+
+  override fun onAdjustVolume(direction: Int) {
+    onSetVolumeTo(this.currentVolume + direction)
+  }
+}

app/src/full/java/com/github/ashutoshgngwr/noice/provider/RealCrashlyticsProvider.kt

@@ -0,0 +1,24 @@
+package com.github.ashutoshgngwr.noice.provider
+
+import com.google.firebase.crashlytics.ktx.crashlytics
+import com.google.firebase.ktx.Firebase
+
+/**
+ * [RealCrashlyticsProvider] provides a real concrete implementation of Crashlytics API.
+ */
+object RealCrashlyticsProvider : CrashlyticsProvider {
+
+  private val fc = Firebase.crashlytics
+
+  override fun recordException(e: Throwable) {
+    fc.recordException(e)
+  }
+
+  override fun setCollectionEnabled(e: Boolean) {
+    fc.setCrashlyticsCollectionEnabled(e)
+  }
+
+  override fun log(m: String) {
+    fc.log(m)
+  }
+}

app/src/full/java/com/github/ashutoshgngwr/noice/widget/InAppBillingDonateView.kt

@@ -0,0 +1,121 @@
+package com.github.ashutoshgngwr.noice.widget
+
+import android.app.Activity
+import android.content.Context
+import android.content.ContextWrapper
+import android.util.AttributeSet
+import android.util.Log
+import android.view.Gravity
+import android.view.LayoutInflater
+import android.view.View
+import androidx.annotation.VisibleForTesting
+import androidx.appcompat.widget.LinearLayoutCompat
+import com.github.ashutoshgngwr.noice.NoiceApplication
+import com.github.ashutoshgngwr.noice.R
+import com.github.ashutoshgngwr.noice.databinding.DonateViewBinding
+import com.github.ashutoshgngwr.noice.provider.BillingProvider
+import com.google.android.material.button.MaterialButton
+import com.google.android.material.snackbar.Snackbar
+import kotlinx.coroutines.CoroutineName
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.cancel
+import kotlinx.coroutines.launch
+
+class InAppBillingDonateView @JvmOverloads constructor(
+  context: Context,
+  attrs: AttributeSet? = null,
+  defStyleAttr: Int = 0
+) : LinearLayoutCompat(context, attrs, defStyleAttr) {
+
+  private lateinit var defaultScope: CoroutineScope
+
+  private val billingProvider = NoiceApplication.of(context).billingProvider
+  private val binding: DonateViewBinding =
+    DonateViewBinding.inflate(LayoutInflater.from(context), this)
+
+  @VisibleForTesting(otherwise = VisibleForTesting.PRIVATE)
+  internal constructor(context: Context, defaultScope: CoroutineScope) : this(context) {
+    this.defaultScope = defaultScope
+  }
+
+  init {
+    orientation = VERTICAL
+    gravity = Gravity.CENTER
+  }
+
+  override fun onAttachedToWindow() {
+    super.onAttachedToWindow()
+    binding.progressCircle.visibility = View.VISIBLE
+    binding.error.visibility = View.GONE
+    binding.buttonContainer.visibility = View.GONE
+
+    defaultScope = CoroutineScope(Job() + CoroutineName("DonateViewScope"))
+    defaultScope.launch(Dispatchers.IO) { loadSkuDetails() }
+  }
+
+  @VisibleForTesting(otherwise = VisibleForTesting.PRIVATE)
+  internal suspend fun loadSkuDetails() {
+    try {
+      val detailsList = billingProvider.queryDetails(
+        BillingProvider.SkuType.INAPP, listOf(
+          "donate_usd1", "donate_usd2", "donate_usd5",
+          "donate_usd10", "donate_usd15", "donate_usd25",
+        )
+      )
+
+      defaultScope.launch(Dispatchers.Main) {
+        setDetails(detailsList.sortedBy { it.priceAmountMicros })
+      }
+    } catch (e: BillingProvider.QueryDetailsException) {
+      Log.w(this::class.simpleName, "failed to load sku details", e)
+      defaultScope.launch(Dispatchers.Main) { setQueryDetailsFailedError() }
+    }
+  }
+
+  private fun setDetails(detailsList: List<BillingProvider.SkuDetails>) {
+    binding.progressCircle.visibility = View.GONE
+    binding.error.visibility = View.GONE
+    binding.buttonContainer.visibility = View.VISIBLE
+    binding.buttonContainer.removeAllViews()
+
+    detailsList.forEach { details ->
+      val b = MaterialButton(context, null, R.attr.materialButtonOutlinedStyle)
+      b.text = details.price
+      b.setOnClickListener {
+        if (!billingProvider.purchase(getActivity(), details)) {
+          Snackbar.make(this, R.string.failed_to_purchase, Snackbar.LENGTH_LONG).show()
+        }
+      }
+      binding.buttonContainer.addView(b)
+    }
+  }
+
+  private fun setQueryDetailsFailedError() {
+    binding.progressCircle.visibility = View.GONE
+    binding.buttonContainer.visibility = View.GONE
+    binding.error.visibility = View.VISIBLE
+    binding.error.setText(R.string.failed_to_load_inapp_purchases)
+  }
+
+  // https://android.googlesource.com/platform/frameworks/support/+/refs/heads/marshmallow-release/v7/mediarouter/src/android/support/v7/app/MediaRouteButton.java#262
+  private fun getActivity(): Activity {
+    // Gross way of unwrapping the Activity
+    var context = context
+    while (context is ContextWrapper) {
+      if (context is Activity) {
+        return context
+      }
+
+      context = context.baseContext
+    }
+
+    throw IllegalStateException("unable to find activity that owns this donate view")
+  }
+
+  override fun onDetachedFromWindow() {
+    defaultScope.cancel()
+    super.onDetachedFromWindow()
+  }
+}

app/src/full/res/drawable/ic_error_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+  android:width="24dp"
+  android:height="24dp"
+  android:viewportWidth="24"
+  android:viewportHeight="24">
+  <path
+    android:fillColor="#FF000000"
+    android:pathData="M11 15h2v2h-2zm0-8h2v6h-2zm0.99-5C6.47 2 2 6.48 2 12s4.47 10 9.99 10C17.52 22 22 17.52 22 12S17.52 2 11.99 2zM12 20c-4.42 0-8-3.58-8-8s3.58-8 8-8 8 3.58 8 8-3.58 8-8 8z" />
+</vector>

app/src/full/res/layout/donate_view.xml

@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="utf-8"?>
+<merge xmlns:android="http://schemas.android.com/apk/res/android"
+  xmlns:app="http://schemas.android.com/apk/res-auto">
+
+  <com.github.ashutoshgngwr.noice.widget.MarkdownTextView
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:layout_marginVertical="10dp"
+    android:lineSpacingMultiplier="1.25"
+    android:text="@string/support_development__donate_google_play_description"
+    android:textAppearance="?attr/textAppearanceBody1" />
+
+  <ProgressBar
+    android:id="@+id/progress_circle"
+    android:layout_width="wrap_content"
+    android:layout_height="wrap_content"
+    android:layout_margin="10dp"
+    android:indeterminate="true" />
+
+  <TextView
+    android:id="@+id/error"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:layout_margin="10dp"
+    android:drawablePadding="10dp"
+    android:textColor="@color/error"
+    app:drawableStartCompat="@drawable/ic_error_24dp"
+    app:drawableTint="@color/error" />
+
+  <com.google.android.flexbox.FlexboxLayout
+    android:id="@+id/button_container"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:layout_margin="10dp"
+    app:alignContent="stretch"
+    app:alignItems="stretch"
+    app:flexWrap="wrap"
+    app:justifyContent="space_evenly" />
+
+</merge>

app/src/full/res/values/donottranslate.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources xmlns:tools="http://schemas.android.com/tools">
+  <string name="cast_app_id__debug" tools:ignore="UnusedResources">EB68E994</string>
+  <string name="cast_app_id__release" tools:ignore="UnusedResources">E421E43B</string>
+  <string name="cast_namespace__default">urn:x-cast:com.github.ashutoshgngwr.noice</string>
+</resources>

app/src/main/AndroidManifest.xml

@@ -0,0 +1,99 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+  xmlns:tools="http://schemas.android.com/tools"
+  package="com.github.ashutoshgngwr.noice">
+
+  <uses-feature
+    android:name="android.hardware.audio.output"
+    android:required="true" />
+
+  <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+
+  <uses-permission android:name="android.permission.WAKE_LOCK" />
+
+  <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
+
+  <uses-permission android:name="com.android.launcher.permission.INSTALL_SHORTCUT" />
+
+  <application
+    android:name="com.github.ashutoshgngwr.noice.NoiceApplication"
+    android:allowBackup="true"
+    android:icon="@mipmap/ic_launcher"
+    android:label="@string/app_name"
+    android:roundIcon="@mipmap/ic_launcher_round"
+    android:supportsRtl="true"
+    android:theme="@style/Theme.App"
+    tools:ignore="AllowBackup,GoogleAppIndexingWarning">
+
+    <activity
+      android:name=".activity.MainActivity"
+      android:exported="true"
+      android:launchMode="singleTask">
+
+      <intent-filter>
+        <action android:name="android.intent.action.MAIN" />
+        <category android:name="android.intent.category.LAUNCHER" />
+      </intent-filter>
+
+      <intent-filter>
+        <action android:name="android.intent.action.APPLICATION_PREFERENCES" />
+        <category android:name="android.intent.category.DEFAULT" />
+      </intent-filter>
+
+      <intent-filter>
+
+        <action android:name="android.intent.action.VIEW" />
+
+        <category android:name="android.intent.category.DEFAULT" />
+        <category android:name="android.intent.category.BROWSABLE" />
+
+        <data
+          android:host="ashutoshgngwr.github.io"
+          android:pathPrefix="/noice/preset"
+          android:scheme="https" />
+
+      </intent-filter>
+
+      <intent-filter>
+
+        <action android:name="android.intent.action.VIEW" />
+
+        <category android:name="android.intent.category.DEFAULT" />
+        <category android:name="android.intent.category.BROWSABLE" />
+
+        <data
+          android:host="preset"
+          android:scheme="noice" />
+
+      </intent-filter>
+
+    </activity>
+
+    <activity
+      android:name=".activity.AppIntroActivity"
+      android:theme="@style/Theme.MaterialComponents.NoActionBar" />
+
+    <activity
+      android:name=".activity.ShortcutHandlerActivity"
+      android:excludeFromRecents="true"
+      android:exported="true" />
+
+    <activity
+      android:name=".activity.AlarmRingerActivity"
+      android:excludeFromRecents="true"
+      android:launchMode="singleInstance" />
+
+    <service android:name=".MediaPlayerService" />
+
+    <receiver
+      android:name=".WakeUpTimerManager$BootReceiver"
+      android:exported="true">
+
+      <intent-filter>
+        <action android:name="android.intent.action.BOOT_COMPLETED" />
+      </intent-filter>
+
+    </receiver>
+
+  </application>
+
+</manifest>

app/src/main/java/com/github/ashutoshgngwr/noice/MediaPlayerService.kt

@@ -0,0 +1,148 @@
+package com.github.ashutoshgngwr.noice
+
+import android.app.PendingIntent
+import android.app.Service
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import android.content.IntentFilter
+import android.media.AudioManager
+import android.os.Build
+import android.os.IBinder
+import android.os.PowerManager
+import android.support.v4.media.MediaMetadataCompat
+import android.support.v4.media.session.MediaSessionCompat
+import android.support.v4.media.session.PlaybackStateCompat
+import android.util.Log
+import androidx.core.content.getSystemService
+import androidx.mediarouter.media.MediaRouter
+import com.github.ashutoshgngwr.noice.activity.MainActivity
+import com.github.ashutoshgngwr.noice.model.Preset
+import com.github.ashutoshgngwr.noice.playback.PlaybackController
+import com.github.ashutoshgngwr.noice.playback.Player
+import com.github.ashutoshgngwr.noice.playback.PlayerManager
+import com.github.ashutoshgngwr.noice.playback.PlayerNotificationManager
+import com.github.ashutoshgngwr.noice.repository.PresetRepository
+import com.github.ashutoshgngwr.noice.repository.SettingsRepository
+import org.greenrobot.eventbus.EventBus
+import java.util.concurrent.TimeUnit
+
+class MediaPlayerService : Service() {
+  /**
+   * [MediaPlayerService] publishes [PlaybackUpdateEvent] whenever there's an update to
+   * [PlayerManager].
+   *
+   * @param state [PlaybackStateCompat] representing the current player state
+   * @param players a snapshot of currently playing sound [Players][Player]
+   */
+  data class PlaybackUpdateEvent(val state: Int, val players: Map<String, Player>)
+
+  companion object {
+    private val TAG = MediaPlayerService::class.java.simpleName
+    private val WAKELOCK_TIMEOUT = TimeUnit.DAYS.toMillis(1)
+
+    private const val FOREGROUND_ID = 0x29
+    private const val RC_MAIN_ACTIVITY = 0x28
+  }
+
+  private lateinit var wakeLock: PowerManager.WakeLock
+  private lateinit var mediaSession: MediaSessionCompat
+  private lateinit var playerManager: PlayerManager
+  private lateinit var presetRepository: PresetRepository
+  private lateinit var settingsRepository: SettingsRepository
+
+  private val becomingNoisyReceiver = object : BroadcastReceiver() {
+    override fun onReceive(context: Context?, intent: Intent?) {
+      if (intent?.action == AudioManager.ACTION_AUDIO_BECOMING_NOISY) {
+        Log.i(TAG, "Becoming noisy... Pause playback!")
+        playerManager.pause()
+      }
+    }
+  }
+
+  override fun onBind(intent: Intent?): IBinder? = null
+
+  override fun onCreate() {
+    super.onCreate()
+    wakeLock = requireNotNull(getSystemService<PowerManager>()).run {
+      newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, packageName).apply {
+        setReferenceCounted(false)
+      }
+    }
+
+    mediaSession = MediaSessionCompat(this, "$TAG.mediaSession").also {
+      var piFlags = PendingIntent.FLAG_UPDATE_CURRENT
+      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+        piFlags = piFlags or PendingIntent.FLAG_IMMUTABLE
+      }
+
+      it.setSessionActivity(
+        PendingIntent.getActivity(
+          this, RC_MAIN_ACTIVITY, Intent(this, MainActivity::class.java), piFlags
+        )
+      )
+
+      it.setPlaybackToLocal(AudioManager.STREAM_MUSIC)
+      it.isActive = true
+      MediaRouter.getInstance(this).setMediaSessionCompat(it)
+    }
+
+    playerManager = PlayerManager(this, mediaSession)
+    playerManager.setPlaybackUpdateListener(this::onPlaybackUpdate)
+
+    presetRepository = PresetRepository.newInstance(this)
+    settingsRepository = SettingsRepository.newInstance(this)
+    PlayerNotificationManager.createChannel(this)
+    registerReceiver(becomingNoisyReceiver, IntentFilter(AudioManager.ACTION_AUDIO_BECOMING_NOISY))
+  }
+
+  private fun onPlaybackUpdate(state: Int, players: Map<String, Player>) {
+    EventBus.getDefault().postSticky(PlaybackUpdateEvent(state, players))
+
+    val currentPreset = getCurrentPreset(players.values)
+    val title = currentPreset?.name ?: getString(R.string.unsaved_preset)
+    mediaSession.setMetadata(
+      MediaMetadataCompat.Builder()
+        .putString(MediaMetadataCompat.METADATA_KEY_TITLE, title)
+        .build()
+    )
+
+    if (state == PlaybackStateCompat.STATE_STOPPED) {
+      stopForeground(true)
+      wakeLock.release()
+    } else {
+      wakeLock.acquire(WAKELOCK_TIMEOUT)
+      startForeground(
+        FOREGROUND_ID,
+        PlayerNotificationManager.createNotification(
+          this, mediaSession, title,
+          currentPreset != null
+        )
+      )
+    }
+  }
+
+  private fun getCurrentPreset(players: Collection<Player>): Preset? {
+    if (players.isEmpty()) {
+      return null
+    }
+
+    return Preset.from("", players).let {
+      presetRepository.list().find { p -> p == it }
+    }
+  }
+
+  override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+    intent?.also { PlaybackController.handleServiceIntent(this, playerManager, it) }
+    return START_STICKY
+  }
+
+  override fun onDestroy() {
+    unregisterReceiver(becomingNoisyReceiver)
+    playerManager.cleanup()
+    mediaSession.release()
+    PlaybackController.clearAutoStopCallback()
+    wakeLock.release()
+    super.onDestroy()
+  }
+}

app/src/main/java/com/github/ashutoshgngwr/noice/NoiceApplication.kt

@@ -0,0 +1,85 @@
+package com.github.ashutoshgngwr.noice
+
+import android.content.Context
+import androidx.annotation.CallSuper
+import androidx.annotation.VisibleForTesting
+import com.github.ashutoshgngwr.noice.provider.AnalyticsProvider
+import com.github.ashutoshgngwr.noice.provider.BillingProvider
+import com.github.ashutoshgngwr.noice.provider.CastAPIProvider
+import com.github.ashutoshgngwr.noice.provider.CrashlyticsProvider
+import com.github.ashutoshgngwr.noice.provider.DonateViewProvider
+import com.github.ashutoshgngwr.noice.provider.DummyAnalyticsProvider
+import com.github.ashutoshgngwr.noice.provider.DummyBillingProvider
+import com.github.ashutoshgngwr.noice.provider.DummyCastAPIProvider
+import com.github.ashutoshgngwr.noice.provider.DummyCrashlyticsProvider
+import com.github.ashutoshgngwr.noice.provider.GitHubReviewFlowProvider
+import com.github.ashutoshgngwr.noice.provider.OpenCollectiveDonateViewProvider
+import com.github.ashutoshgngwr.noice.provider.ReviewFlowProvider
+import com.github.ashutoshgngwr.noice.repository.SettingsRepository
+
+open class NoiceApplication : android.app.Application() {
+
+  companion object {
+    /**
+     * Convenience method that returns [NoiceApplication] from the provided [context].
+     */
+    fun of(context: Context): NoiceApplication = context.applicationContext as NoiceApplication
+  }
+
+  lateinit var castAPIProvider: CastAPIProvider
+    @VisibleForTesting(otherwise = VisibleForTesting.PROTECTED)
+    internal set
+
+  lateinit var reviewFlowProvider: ReviewFlowProvider
+    @VisibleForTesting(otherwise = VisibleForTesting.PROTECTED)
+    internal set
+
+  lateinit var crashlyticsProvider: CrashlyticsProvider
+    @VisibleForTesting(otherwise = VisibleForTesting.PROTECTED)
+    internal set
+
+  lateinit var analyticsProvider: AnalyticsProvider
+    @VisibleForTesting(otherwise = VisibleForTesting.PROTECTED)
+    internal set
+
+  lateinit var billingProvider: BillingProvider
+    @VisibleForTesting(otherwise = VisibleForTesting.PROTECTED)
+    internal set
+
+  lateinit var donateViewProvider: DonateViewProvider
+    @VisibleForTesting(otherwise = VisibleForTesting.PROTECTED)
+    internal set
+
+  override fun onCreate() {
+    super.onCreate()
+    initProviders()
+    SettingsRepository.newInstance(this)
+      .shouldShareUsageData()
+      .also {
+        analyticsProvider.setCollectionEnabled(it)
+        crashlyticsProvider.setCollectionEnabled(it)
+      }
+  }
+
+  /**
+   * [initProviders] is invoked when application is created (in [onCreate]). It can be overridden by
+   * a subclass to swap default implementations of [castAPIProvider], [reviewFlowProvider],
+   * [crashlyticsProvider], [analyticsProvider], [billingProvider] and [donateViewProvider].
+   */
+  @CallSuper
+  protected open fun initProviders() {
+    castAPIProvider = DummyCastAPIProvider
+    reviewFlowProvider = GitHubReviewFlowProvider
+    crashlyticsProvider = DummyCrashlyticsProvider
+    analyticsProvider = DummyAnalyticsProvider
+    billingProvider = DummyBillingProvider
+    donateViewProvider = OpenCollectiveDonateViewProvider
+  }
+
+  /**
+   * Indicates if Google Mobile Services are available on the client device.
+   */
+  open fun isGoogleMobileServicesAvailable(): Boolean {
+    return false
+  }
+}

app/src/main/java/com/github/ashutoshgngwr/noice/WakeUpTimerManager.kt

@@ -0,0 +1,139 @@
+package com.github.ashutoshgngwr.noice
+
+import android.app.AlarmManager
+import android.app.PendingIntent
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import android.os.Build
+import androidx.annotation.VisibleForTesting
+import androidx.core.content.edit
+import androidx.core.content.getSystemService
+import androidx.preference.PreferenceManager
+import com.github.ashutoshgngwr.noice.activity.AlarmRingerActivity
+import com.github.ashutoshgngwr.noice.activity.MainActivity
+import com.github.ashutoshgngwr.noice.repository.PresetRepository
+import com.google.gson.GsonBuilder
+import com.google.gson.annotations.Expose
+
+object WakeUpTimerManager {
+
+  /**
+   * [Timer] declares fields necessary to schedule a Wake-up timer.
+   */
+  data class Timer(@Expose var presetID: String, @Expose var atMillis: Long)
+
+  @VisibleForTesting(otherwise = VisibleForTesting.PRIVATE)
+  const val PREF_WAKE_UP_TIMER = "wake_up_timer"
+
+  @VisibleForTesting(otherwise = VisibleForTesting.PRIVATE)
+  const val PREF_LAST_USED_PRESET_ID = "last_used_preset_id"
+
+  private const val RC_MAIN_ACTIVITY = 0x40
+
+  private val gson = GsonBuilder().excludeFieldsWithoutExposeAnnotation().create()
+
+  private inline fun <T> withAlarmManager(ctx: Context, crossinline block: (AlarmManager) -> T): T {
+    return with(requireNotNull(ctx.getSystemService()), block)
+  }
+
+  private fun getPendingIntentForActivity(context: Context) =
+    Intent(context, MainActivity::class.java).let {
+      it.putExtra(MainActivity.EXTRA_NAV_DESTINATION, R.id.wake_up_timer)
+      var piFlags = PendingIntent.FLAG_UPDATE_CURRENT
+      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+        piFlags = piFlags or PendingIntent.FLAG_IMMUTABLE
+      }
+
+      PendingIntent.getActivity(context, RC_MAIN_ACTIVITY, it, piFlags)
+    }
+
+  /**
+   * [set] schedules the given [Timer] using Android's [AlarmManager]. It also persists the [Timer]
+   * instance onto device storage to be able return it later upon querying.
+   */
+  fun set(context: Context, timer: Timer) {
+    if (timer.atMillis < System.currentTimeMillis()) {
+      return
+    }
+
+    if (PresetRepository.newInstance(context).get(timer.presetID) == null) {
+      return
+    }
+
+    PreferenceManager.getDefaultSharedPreferences(context).edit {
+      putString(PREF_WAKE_UP_TIMER, gson.toJson(timer))
+    }
+
+    withAlarmManager(context) {
+      it.setAlarmClock(
+        AlarmManager.AlarmClockInfo(timer.atMillis, getPendingIntentForActivity(context)),
+        AlarmRingerActivity.getPendingIntent(context, timer.presetID)
+      )
+    }
+  }
+
+  /**
+   * [cancel] cancels the last scheduled timer.
+   */
+  fun cancel(context: Context) {
+    PreferenceManager.getDefaultSharedPreferences(context).edit {
+      remove(PREF_WAKE_UP_TIMER)
+    }
+
+    withAlarmManager(context) {
+      // don't need concrete timer value for cancelling the alarm.
+      it.cancel(AlarmRingerActivity.getPendingIntent(context, null))
+    }
+  }
+
+  /**
+   * [get] returns the last scheduled timer if found in the persisted state. Returns null otherwise.
+   */
+  fun get(context: Context): Timer? {
+    val timer = PreferenceManager.getDefaultSharedPreferences(context)
+      .getString(PREF_WAKE_UP_TIMER, null)
+
+    return gson.fromJson(timer, Timer::class.java)
+  }
+
+  /**
+   * [saveLastUsedPresetID] saves the ID of the preset last used by the user in a Wake-up timer.
+   */
+  fun saveLastUsedPresetID(context: Context, selectedPresetID: String?) {
+    val sharedPrefs = PreferenceManager.getDefaultSharedPreferences(context)
+    with(sharedPrefs.edit()) {
+      putString(PREF_LAST_USED_PRESET_ID, selectedPresetID)
+      apply()
+    }
+  }
+
+  /**
+   * [getLastUsedPresetID] return the saved ID of the last selected preset. Returns null otherwise.
+   */
+  fun getLastUsedPresetID(context: Context): String? {
+    return with(PreferenceManager.getDefaultSharedPreferences(context)) {
+      val lastSelectedPresetID = getString(PREF_LAST_USED_PRESET_ID, null)
+
+      // ensure that preset with given ID exists in preferences.
+      PresetRepository.newInstance(context).get(lastSelectedPresetID)?.id
+    }
+  }
+
+  /**
+   * [BootReceiver] ensures that a scheduled [Timer] is able to persist across device restarts.
+   */
+  class BootReceiver : BroadcastReceiver() {
+
+    override fun onReceive(context: Context, intent: Intent?) {
+      if (Intent.ACTION_BOOT_COMPLETED != intent?.action) {
+        return
+      }
+
+      val timer = get(context) ?: return
+      if (timer.atMillis > System.currentTimeMillis()) {
+        set(context, timer)
+      }
+    }
+  }
+}

app/src/main/java/com/github/ashutoshgngwr/noice/activity/AlarmRingerActivity.kt

@@ -0,0 +1,153 @@
+package com.github.ashutoshgngwr.noice.activity
+
+import android.app.PendingIntent
+import android.content.Context
+import android.content.Intent
+import android.os.Build
+import android.os.Bundle
+import android.os.Handler
+import android.util.Log
+import android.view.Window
+import android.view.WindowManager
+import androidx.annotation.VisibleForTesting
+import androidx.appcompat.app.AppCompatActivity
+import androidx.appcompat.app.AppCompatDelegate
+import androidx.core.content.ContextCompat
+import androidx.core.os.bundleOf
+import androidx.core.view.WindowCompat
+import androidx.core.view.WindowInsetsCompat
+import androidx.core.view.WindowInsetsControllerCompat
+import androidx.media.AudioAttributesCompat
+import com.github.ashutoshgngwr.noice.MediaPlayerService
+import com.github.ashutoshgngwr.noice.NoiceApplication
+import com.github.ashutoshgngwr.noice.databinding.AlarmRingerActivityBinding
+import com.github.ashutoshgngwr.noice.playback.PlaybackController
+import com.github.ashutoshgngwr.noice.playback.strategy.LocalPlaybackStrategy
+import com.github.ashutoshgngwr.noice.provider.AnalyticsProvider
+import com.github.ashutoshgngwr.noice.repository.SettingsRepository
+import com.ncorti.slidetoact.SlideToActView
+
+class AlarmRingerActivity : AppCompatActivity(), SlideToActView.OnSlideCompleteListener {
+
+  companion object {
+    @VisibleForTesting
+    internal const val EXTRA_PRESET_ID = "preset_id"
+
+    private const val RC_ALARM = 0x39
+    private val LOG_TAG = AlarmRingerActivity::class.simpleName
+
+    fun getPendingIntent(context: Context, presetID: String?): PendingIntent {
+      var piFlags = PendingIntent.FLAG_UPDATE_CURRENT
+      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+        piFlags = piFlags or PendingIntent.FLAG_IMMUTABLE
+      }
+
+      return Intent(context, AlarmRingerActivity::class.java)
+        .putExtra(EXTRA_PRESET_ID, presetID)
+        .let { PendingIntent.getActivity(context, RC_ALARM, it, piFlags) }
+    }
+  }
+
+  private lateinit var binding: AlarmRingerActivityBinding
+  private lateinit var settingsRepository: SettingsRepository
+  private lateinit var analyticsProvider: AnalyticsProvider
+  private var ringerStartTime: Long = 0L
+
+  override fun onCreate(savedInstanceState: Bundle?) {
+    settingsRepository = SettingsRepository.newInstance(this)
+    AppCompatDelegate.setDefaultNightMode(settingsRepository.getAppThemeAsNightMode())
+    super.onCreate(savedInstanceState)
+
+    supportRequestWindowFeature(Window.FEATURE_NO_TITLE)
+    binding = AlarmRingerActivityBinding.inflate(layoutInflater)
+    binding.dismissSlider.onSlideCompleteListener = this
+    setContentView(binding.root)
+    showWhenLocked()
+
+    analyticsProvider = NoiceApplication.of(this).analyticsProvider
+    ringerStartTime = System.currentTimeMillis()
+  }
+
+  override fun onNewIntent(intent: Intent?) {
+    super.onNewIntent(intent)
+    setIntent(intent)
+  }
+
+  override fun onResume() {
+    super.onResume()
+    enableImmersiveMode()
+
+    // handle the new intent here since onResume() is guaranteed to be called after onNewIntent().
+    // https://developer.android.com/reference/android/app/Activity#onNewIntent(android.content.Intent)
+    val presetID = intent.getStringExtra(EXTRA_PRESET_ID)
+    if (presetID == null) {
+      Log.d(LOG_TAG, "onResume(): presetID is null")
+      finish()
+      return
+    }
+
+    // Since activity takes a moment to actually show up, invoking `startService` from `onCreate` or
+    // `onResume` fails with `java.lang.IllegalStateException: Not allowed to start service Intent:
+    // app is in background` on recent Android version (O+). `PlaybackController` can not call
+    // `startForegroundService` since it doesn't know if an action will bring `MediaPlayerService`
+    // to foreground. To prevent `PlaybackController` from causing this error by invoking
+    // `startService`, we need to manually start `MediaPlayerService` in the foreground since we can
+    // be certain that playPreset action will bring it to foreground before Android System kills it.
+    ContextCompat.startForegroundService(this, Intent(this, MediaPlayerService::class.java))
+
+    Log.d(LOG_TAG, "onResume(): starting preset")
+    PlaybackController.setAudioUsage(this, AudioAttributesCompat.USAGE_ALARM)
+    PlaybackController.playPreset(this, presetID)
+  }
+
+  override fun onStop() {
+    super.onStop()
+    if (!isFinishing) {
+      return
+    }
+
+    Log.d(LOG_TAG, "onStop(): pausing playback")
+    PlaybackController.pause(this)
+
+    // TODO: find a better solution to wait for pause transition to finish before switching streams.
+    Handler(mainLooper).postDelayed({
+      PlaybackController.setAudioUsage(this, AudioAttributesCompat.USAGE_MEDIA)
+    }, LocalPlaybackStrategy.DEFAULT_FADE_DURATION)
+
+    val duration = System.currentTimeMillis() - ringerStartTime
+    analyticsProvider.logEvent("alarm_ringer_session", bundleOf("duration_ms" to duration))
+  }
+
+  override fun onBackPressed() = Unit
+
+  override fun onSlideComplete(view: SlideToActView) {
+    finish()
+  }
+
+  private fun enableImmersiveMode() {
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
+      window.attributes.layoutInDisplayCutoutMode =
+        WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_SHORT_EDGES
+    }
+
+    WindowCompat.setDecorFitsSystemWindows(window, false)
+    WindowCompat.getInsetsController(window, binding.root)?.apply {
+      systemBarsBehavior = WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
+      hide(WindowInsetsCompat.Type.systemBars())
+    }
+  }
+
+  private fun showWhenLocked() {
+    window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O_MR1) {
+      setShowWhenLocked(true)
+      setTurnScreenOn(true)
+    } else {
+      @Suppress("Deprecation")
+      window.addFlags(
+        WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED or
+          WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
+      )
+    }
+  }
+}

app/src/main/java/com/github/ashutoshgngwr/noice/activity/AppIntroActivity.kt

@@ -0,0 +1,133 @@
+package com.github.ashutoshgngwr.noice.activity
+
+import android.content.Context
+import android.content.Intent
+import android.os.Bundle
+import androidx.annotation.VisibleForTesting
+import androidx.core.app.ActivityCompat
+import androidx.core.content.edit
+import androidx.core.os.bundleOf
+import androidx.fragment.app.Fragment
+import androidx.preference.PreferenceManager
+import com.github.appintro.AppIntro
+import com.github.appintro.AppIntroPageTransformerType
+import com.github.ashutoshgngwr.noice.NoiceApplication
+import com.github.ashutoshgngwr.noice.R
+import com.github.ashutoshgngwr.noice.fragment.AppIntroFragment
+import com.github.ashutoshgngwr.noice.provider.AnalyticsProvider
+
+class AppIntroActivity : AppIntro() {
+
+  companion object {
+    @VisibleForTesting(otherwise = VisibleForTesting.PRIVATE)
+    const val PREF_HAS_USER_SEEN_APP_INTRO = "has_user_seen_app_intro"
+
+    /**
+     * [maybeStart] displays the [AppIntroActivity] if user hasn't seen it before.
+     */
+    fun maybeStart(context: Context) {
+      PreferenceManager.getDefaultSharedPreferences(context).also {
+        if (!it.getBoolean(PREF_HAS_USER_SEEN_APP_INTRO, false)) {
+          context.startActivity(Intent(context, AppIntroActivity::class.java))
+        }
+      }
+    }
+  }
+
+  private lateinit var analyticsProvider: AnalyticsProvider
+
+  override fun onCreate(savedInstanceState: Bundle?) {
+    super.onCreate(savedInstanceState)
+    isColorTransitionsEnabled = true
+    showStatusBar(true)
+
+    setStatusBarColor(ActivityCompat.getColor(this, R.color.status_bar))
+    setTransformer(
+      AppIntroPageTransformerType.Parallax(
+        titleParallaxFactor = 1.0,
+        imageParallaxFactor = -1.0,
+        descriptionParallaxFactor = 2.0
+      )
+    )
+    addSlide(
+      AppIntroFragment.newInstance(
+        title = getString(R.string.appintro__getting_started_title),
+        description = "${getString(R.string.app_description)}\n\n${getString(R.string.appintro__getting_started_desc_0)}",
+        imageDrawable = R.drawable.app_banner,
+        titleColor = ActivityCompat.getColor(this, R.color.appintro__text_color),
+        descriptionColor = ActivityCompat.getColor(this, R.color.appintro__text_color),
+        backgroundColor = ActivityCompat.getColor(this, R.color.appintro_slide_0__background)
+      )
+    )
+    addSlide(
+      AppIntroFragment.newInstance(
+        title = getString(R.string.appintro__library_title),
+        description = getString(R.string.appintro__library_desc),
+        imageDrawable = R.drawable.ic_appintro_library,
+        titleColor = ActivityCompat.getColor(this, R.color.appintro__text_color),
+        descriptionColor = ActivityCompat.getColor(this, R.color.appintro__text_color),
+        backgroundColor = ActivityCompat.getColor(this, R.color.appintro_slide_1__background)
+      )
+    )
+    addSlide(
+      AppIntroFragment.newInstance(
+        title = getString(R.string.appintro__presets_title),
+        description = getString(R.string.appintro__presets_desc),
+        imageDrawable = R.drawable.ic_appintro_presets,
+        titleColor = ActivityCompat.getColor(this, R.color.appintro__text_color),
+        descriptionColor = ActivityCompat.getColor(this, R.color.appintro__text_color),
+        backgroundColor = ActivityCompat.getColor(this, R.color.appintro_slide_2__background)
+      )
+    )
+    addSlide(
+      AppIntroFragment.newInstance(
+        title = getString(R.string.appintro__timer_title),
+        description = getString(R.string.appintro__timer_desc),
+        imageDrawable = R.drawable.ic_appintro_sleep_timer,
+        titleColor = ActivityCompat.getColor(this, R.color.appintro__text_color),
+        descriptionColor = ActivityCompat.getColor(this, R.color.appintro__text_color),
+        backgroundColor = ActivityCompat.getColor(this, R.color.appintro_slide_3__background)
+      )
+    )
+    addSlide(
+      AppIntroFragment.newInstance(
+        title = getString(R.string.appintro__chromecast_title),
+        description = getString(R.string.appintro__chromecast_desc),
+        imageDrawable = R.drawable.ic_appintro_chromecast,
+        titleColor = ActivityCompat.getColor(this, R.color.appintro__text_color),
+        descriptionColor = ActivityCompat.getColor(this, R.color.appintro__text_color),
+        backgroundColor = ActivityCompat.getColor(this, R.color.appintro_slide_4__background)
+      )
+    )
+    addSlide(
+      AppIntroFragment.newInstance(
+        title = getString(R.string.appintro__getting_started_title),
+        description = getString(R.string.appintro__getting_started_desc_1),
+        imageDrawable = R.drawable.app_banner,
+        titleColor = ActivityCompat.getColor(this, R.color.appintro__text_color),
+        descriptionColor = ActivityCompat.getColor(this, R.color.appintro__text_color),
+        backgroundColor = ActivityCompat.getColor(this, R.color.appintro_slide_5__background)
+      )
+    )
+
+    analyticsProvider = NoiceApplication.of(this).analyticsProvider
+    analyticsProvider.setCurrentScreen("app_intro", AppIntroActivity::class)
+  }
+
+  override fun onSkipPressed(currentFragment: Fragment?) {
+    markSeenInPrefsAndFinish(true)
+  }
+
+  override fun onDonePressed(currentFragment: Fragment?) {
+    markSeenInPrefsAndFinish(false)
+  }
+
+  private fun markSeenInPrefsAndFinish(isSkipped: Boolean) {
+    PreferenceManager.getDefaultSharedPreferences(this).edit {
+      putBoolean(PREF_HAS_USER_SEEN_APP_INTRO, true)
+    }
+
+    finish()
+    analyticsProvider.logEvent("app_intro_complete", bundleOf("success" to !isSkipped))
+  }
+}

app/src/main/java/com/github/ashutoshgngwr/noice/activity/MainActivity.kt

@@ -0,0 +1,180 @@
+package com.github.ashutoshgngwr.noice.activity
+
+import android.content.Intent
+import android.os.Bundle
+import androidx.annotation.VisibleForTesting
+import androidx.appcompat.app.AppCompatActivity
+import androidx.appcompat.app.AppCompatDelegate
+import androidx.core.content.edit
+import androidx.core.os.bundleOf
+import androidx.navigation.NavController
+import androidx.navigation.fragment.NavHostFragment
+import androidx.navigation.ui.AppBarConfiguration
+import androidx.navigation.ui.setupActionBarWithNavController
+import androidx.preference.PreferenceManager
+import com.github.ashutoshgngwr.noice.BuildConfig
+import com.github.ashutoshgngwr.noice.NoiceApplication
+import com.github.ashutoshgngwr.noice.R
+import com.github.ashutoshgngwr.noice.databinding.MainActivityBinding
+import com.github.ashutoshgngwr.noice.fragment.DialogFragment
+import com.github.ashutoshgngwr.noice.navigation.Navigable
+import com.github.ashutoshgngwr.noice.playback.PlaybackController
+import com.github.ashutoshgngwr.noice.provider.BillingProvider
+import com.github.ashutoshgngwr.noice.repository.SettingsRepository
+import com.google.android.material.snackbar.Snackbar
+
+class MainActivity : AppCompatActivity(), BillingProvider.PurchaseListener {
+
+  companion object {
+    /**
+     * [EXTRA_NAV_DESTINATION] declares the key for intent extra value passed to [MainActivity] for
+     * setting the current destination on the [NavController]. The value for this extra should be an
+     * id resource representing the action/destination id present in the [main][R.navigation.main]
+     * or [home][R.navigation.home] navigation graphs.
+     */
+    internal const val EXTRA_NAV_DESTINATION = "nav_destination"
+
+    @VisibleForTesting
+    internal const val PREF_HAS_SEEN_DATA_COLLECTION_CONSENT = "has_seen_data_collection_consent"
+
+    @VisibleForTesting
+    internal const val PREF_HAS_SEEN_V2_ANNOUNCEMENT = "has_seen_v2_announcement"
+  }
+
+  private lateinit var binding: MainActivityBinding
+  private lateinit var settingsRepository: SettingsRepository
+  private lateinit var app: NoiceApplication
+  private lateinit var navController: NavController
+
+  /**
+   * indicates whether the activity was delivered a new intent since it was last resumed.
+   */
+  private var hasNewIntent = false
+
+  override fun onCreate(savedInstanceState: Bundle?) {
+    app = NoiceApplication.of(this)
+    settingsRepository = SettingsRepository.newInstance(this)
+
+    AppCompatDelegate.setDefaultNightMode(settingsRepository.getAppThemeAsNightMode())
+    super.onCreate(savedInstanceState)
+    binding = MainActivityBinding.inflate(layoutInflater)
+    setContentView(binding.root)
+
+    val navHostFragment = requireNotNull(binding.navHostFragment.getFragment<NavHostFragment>())
+    navController = navHostFragment.navController
+
+    setupActionBarWithNavController(navController, AppBarConfiguration(navController.graph))
+
+    AppIntroActivity.maybeStart(this)
+    maybeShowV2Announcement()
+    if (!BuildConfig.IS_FREE_BUILD) {
+      maybeShowDataCollectionConsent()
+    }
+
+    app.reviewFlowProvider.init(this)
+    app.billingProvider.init(this, this)
+    app.analyticsProvider.logEvent("ui_open", bundleOf("theme" to settingsRepository.getAppTheme()))
+    hasNewIntent = true
+  }
+
+  private fun maybeShowV2Announcement() {
+    val prefs = PreferenceManager.getDefaultSharedPreferences(this)
+    if (prefs.getBoolean(PREF_HAS_SEEN_V2_ANNOUNCEMENT, false)) {
+      return
+    }
+
+    DialogFragment.show(supportFragmentManager) {
+      title(R.string.v2_announcement_title)
+      message(R.string.v2_announcement_message)
+      positiveButton(R.string.okay)
+      onDismiss {
+        prefs.edit { putBoolean(PREF_HAS_SEEN_V2_ANNOUNCEMENT, true) }
+      }
+    }
+  }
+
+  private fun maybeShowDataCollectionConsent() {
+    val prefs = PreferenceManager.getDefaultSharedPreferences(this)
+    if (prefs.getBoolean(PREF_HAS_SEEN_DATA_COLLECTION_CONSENT, false)) {
+      return
+    }
+
+    DialogFragment.show(supportFragmentManager) {
+      isCancelable = false
+      title(R.string.share_usage_data_consent_title)
+      message(R.string.share_usage_data_consent_message)
+
+      positiveButton(R.string.accept) {
+        settingsRepository.setShouldShareUsageData(true)
+        app.analyticsProvider.setCollectionEnabled(true)
+        app.crashlyticsProvider.setCollectionEnabled(true)
+        prefs.edit { putBoolean(PREF_HAS_SEEN_DATA_COLLECTION_CONSENT, true) }
+      }
+
+      negativeButton(R.string.decline) {
+        settingsRepository.setShouldShareUsageData(false)
+        app.analyticsProvider.setCollectionEnabled(false)
+        app.crashlyticsProvider.setCollectionEnabled(false)
+        prefs.edit { putBoolean(PREF_HAS_SEEN_DATA_COLLECTION_CONSENT, true) }
+      }
+    }
+  }
+
+  override fun onNewIntent(intent: Intent) {
+    super.onNewIntent(intent)
+    setIntent(intent)
+    navController.handleDeepLink(intent)
+    hasNewIntent = true
+  }
+
+  override fun onResume() {
+    super.onResume()
+
+    // handle the new intent here since onResume() is guaranteed to be called after onNewIntent().
+    // https://developer.android.com/reference/android/app/Activity#onNewIntent(android.content.Intent)
+    if (!hasNewIntent) {
+      return
+    }
+
+    hasNewIntent = false
+    if (intent.hasExtra(EXTRA_NAV_DESTINATION)) {
+      val destID = intent.getIntExtra(EXTRA_NAV_DESTINATION, 0)
+      if (!Navigable.navigate(binding.navHostFragment.getFragment(), destID)) {
+        navController.navigate(destID)
+      }
+    } else if (Intent.ACTION_APPLICATION_PREFERENCES == intent.action) {
+      navController.navigate(R.id.settings)
+    }
+
+    if (Intent.ACTION_VIEW == intent.action &&
+      (intent.dataString?.startsWith("https://ashutoshgngwr.github.io/noice/preset") == true ||
+        intent.dataString?.startsWith("noice://preset") == true)
+    ) {
+      intent.data?.also { PlaybackController.playPresetFromUri(this, it) }
+    }
+  }
+
+  override fun onDestroy() {
+    app.billingProvider.close()
+    super.onDestroy()
+  }
+
+  override fun onSupportNavigateUp(): Boolean {
+    return navController.navigateUp() || super.onSupportNavigateUp()
+  }
+
+  override fun onPending(skus: List<String>) {
+    Snackbar.make(binding.navHostFragment, R.string.payment_pending, Snackbar.LENGTH_LONG).show()
+    app.analyticsProvider.logEvent("purchase_pending", bundleOf())
+  }
+
+  override fun onComplete(skus: List<String>, orderId: String) {
+    app.analyticsProvider.logEvent("purchase_complete", bundleOf())
+    app.billingProvider.consumePurchase(orderId)
+    DialogFragment.show(supportFragmentManager) {
+      title(R.string.support_development__donate_thank_you)
+      message(R.string.support_development__donate_thank_you_description)
+      positiveButton(R.string.okay)
+    }
+  }
+}

app/src/main/java/com/github/ashutoshgngwr/noice/activity/ShortcutHandlerActivity.kt

@@ -0,0 +1,65 @@
+package com.github.ashutoshgngwr.noice.activity
+
+import android.content.Intent
+import android.content.pm.ShortcutManager
+import android.os.Bundle
+import android.widget.Toast
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.os.bundleOf
+import com.github.ashutoshgngwr.noice.NoiceApplication
+import com.github.ashutoshgngwr.noice.R
+import com.github.ashutoshgngwr.noice.playback.PlaybackController
+import com.github.ashutoshgngwr.noice.repository.PresetRepository
+
+class ShortcutHandlerActivity : AppCompatActivity() {
+
+  companion object {
+    const val EXTRA_PRESET_ID = "preset_name"
+    const val EXTRA_SHORTCUT_ID = "shortcut_id"
+
+    /**
+     * Non-critical metadata; used for analytics.
+     */
+    const val EXTRA_SHORTCUT_TYPE = "shortcut_type"
+  }
+
+  private val analyticsProvider by lazy { NoiceApplication.of(this).analyticsProvider }
+
+  override fun onCreate(savedInstanceState: Bundle?) {
+    super.onCreate(savedInstanceState)
+
+    val params = bundleOf()
+    intent.getStringExtra(EXTRA_PRESET_ID)?.also {
+      // id is passed with the intent. For app version <= 0.15.0, preset id was treated as shortcut
+      // id. Hence, using preset id as fallback in cases where shortcut id is null.
+      reportShortcutUsage(intent.getStringExtra(EXTRA_SHORTCUT_ID) ?: it)
+
+      if (PresetRepository.newInstance(this).get(it) == null) {
+        Toast.makeText(this, R.string.preset_does_not_exist, Toast.LENGTH_LONG).show()
+        params.putBoolean("success", false)
+      } else {
+        PlaybackController.playPreset(this, it)
+        params.putBoolean("success", true)
+      }
+    }
+
+    Intent(this, MainActivity::class.java)
+      .putExtra(MainActivity.EXTRA_NAV_DESTINATION, R.id.presets)
+      .also { startActivity(it) }
+
+    finish()
+
+    params.putString("shortcut_type", intent.getStringExtra(EXTRA_SHORTCUT_TYPE))
+    analyticsProvider.logEvent("preset_shortcut_open", params)
+  }
+
+  private fun reportShortcutUsage(shortcutID: String) {
+    if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.N_MR1) {
+      return
+    }
+
+    getSystemService(ShortcutManager::class.java).also {
+      it.reportShortcutUsed(shortcutID)
+    }
+  }
+}

app/src/main/java/com/github/ashutoshgngwr/noice/ext/SharedPreferencesExt.kt

@@ -0,0 +1,14 @@
+package com.github.ashutoshgngwr.noice.ext
+
+import android.content.SharedPreferences
+
+/**
+ * [getMutableStringSet] returns a mutable copy of the original [Set]<[String]> returned by
+ * [SharedPreferences.getStringSet]. If the [Set] isn't present in the [SharedPreferences], it
+ * returns an empty [MutableSet].
+ *
+ * @return [MutableSet]<[String]>
+ */
+fun SharedPreferences.getMutableStringSet(key: String): MutableSet<String> {
+  return getStringSet(key, null)?.toMutableSet() ?: mutableSetOf()
+}

app/src/main/java/com/github/ashutoshgngwr/noice/ext/SimpleExoPlayerExt.kt

@@ -0,0 +1,80 @@
+package com.github.ashutoshgngwr.noice.ext
+
+import android.annotation.SuppressLint
+import android.os.Handler
+import android.os.Looper
+import androidx.core.os.HandlerCompat
+import androidx.media.AudioAttributesCompat
+import com.google.android.exoplayer2.SimpleExoPlayer
+import com.google.android.exoplayer2.audio.AudioAttributes
+import kotlin.math.abs
+import kotlin.math.ceil
+import kotlin.math.max
+import kotlin.math.min
+
+
+private const val FADE_VOLUME_STEP = 0.001f
+private val handler = Handler(Looper.getMainLooper())
+
+/**
+ * Fade in and out effect for [SimpleExoPlayer].
+ *
+ * @param fromVolume initial volume where the fade transition will start
+ * @param toVolume final volume where the fade transition will end
+ * @param duration duration of fade in ms
+ * @param callback callback when fade transition finishes
+ */
+fun SimpleExoPlayer.fade(
+  fromVolume: Float,
+  toVolume: Float,
+  duration: Long,
+  callback: (() -> Unit)? = null
+) {
+  // TODO: the code works for current requirements, but it is problematic. e.g. it cancels the
+  //  previous transition (if on-going) when a new one is scheduled, thus also cancelling its
+  //  callback. This behaviour might not be desired.
+
+  handler.removeCallbacksAndMessages(this)
+  if (!playWhenReady && !isPlaying) {
+    // edge case where fade is requested but playback is not playing.
+    volume = toVolume
+    callback?.invoke()
+    return
+  }
+
+  val sign = if (toVolume > fromVolume) 1 else -1
+  val steps = 1 + ceil(abs(toVolume - fromVolume) / FADE_VOLUME_STEP).toInt()
+  val period = duration / steps
+  volume = fromVolume
+  for (i in 0 until steps) {
+    HandlerCompat.postDelayed(
+      handler,
+      { volume = max(0f, min(1f, volume + (sign * FADE_VOLUME_STEP))) },
+      this,
+      i * period
+    )
+  }
+
+  HandlerCompat.postDelayed(handler, {
+    volume = max(0f, min(1f, toVolume))
+    callback?.invoke()
+  }, this, duration + 50)
+}
+
+/**
+ * Implicitly translates [AudioAttributesCompat] to [AudioAttributes] and sets them on the provided
+ * [SimpleExoPlayer] receiver instance.
+ */
+fun SimpleExoPlayer.setAudioAttributesCompat(compatAttrs: AudioAttributesCompat) {
+  // internally, both implementations borrow their constants from `android.media`.
+  @SuppressLint("WrongConstant")
+  val attrs = AudioAttributes.Builder()
+    .setContentType(compatAttrs.contentType)
+    .setFlags(compatAttrs.flags)
+    .setUsage(compatAttrs.usage)
+    .build()
+
+  if (attrs != audioAttributes) {
+    audioAttributes = attrs
+  }
+}

app/src/main/java/com/github/ashutoshgngwr/noice/ext/UriExt.kt

@@ -0,0 +1,26 @@
+package com.github.ashutoshgngwr.noice.ext
+
+import android.content.Context
+import android.net.Uri
+import androidx.browser.customtabs.CustomTabColorSchemeParams
+import androidx.browser.customtabs.CustomTabsIntent
+import androidx.core.content.res.ResourcesCompat
+import com.github.ashutoshgngwr.noice.R
+
+
+/**
+ * Launches the receiver [Uri] using an app themed [CustomTabsIntent].
+ */
+fun Uri.launchInCustomTab(context: Context) {
+  val tbColor = ResourcesCompat.getColor(context.resources, R.color.action_bar, context.theme)
+  val colorParams = CustomTabColorSchemeParams.Builder()
+    .setToolbarColor(tbColor)
+    .setNavigationBarColor(tbColor)
+    .build()
+
+  val customTabsIntent = CustomTabsIntent.Builder()
+    .setDefaultColorSchemeParams(colorParams)
+    .build()
+
+  customTabsIntent.launchUrl(context, this)
+}

app/src/main/java/com/github/ashutoshgngwr/noice/fragment/AboutFragment.kt

@@ -0,0 +1,123 @@
+package com.github.ashutoshgngwr.noice.fragment
+
+import android.net.Uri
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.annotation.DrawableRes
+import androidx.annotation.StringRes
+import androidx.fragment.app.Fragment
+import com.github.ashutoshgngwr.noice.BuildConfig
+import com.github.ashutoshgngwr.noice.NoiceApplication
+import com.github.ashutoshgngwr.noice.R
+import com.github.ashutoshgngwr.noice.ext.launchInCustomTab
+import mehdi.sakout.aboutpage.AboutPage
+import mehdi.sakout.aboutpage.Element
+
+class AboutFragment : Fragment() {
+
+  override fun onCreateView(
+    inflater: LayoutInflater,
+    container: ViewGroup?,
+    savedInstanceState: Bundle?
+  ): View? {
+    return AboutPage(context).run {
+      setImage(R.drawable.app_banner)
+      setDescription(getString(R.string.app_description))
+      addItem(
+        buildElement(
+          R.drawable.ic_about_version,
+          "v${BuildConfig.VERSION_NAME}",
+          getString(R.string.app_changelog_url)
+        )
+      )
+
+      addItem(
+        buildElement(
+          R.drawable.ic_about_copyright,
+          R.string.app_copyright,
+          R.string.app_license_url
+        )
+      )
+
+      addItem(
+        buildElement(
+          R.drawable.ic_about_group,
+          R.string.app_authors,
+          R.string.app_authors_url
+        )
+      )
+
+      if (NoiceApplication.of(requireContext()).isGoogleMobileServicesAvailable()) {
+        addItem(
+          buildElement(
+            R.drawable.about_icon_google_play,
+            R.string.about_play_store,
+            R.string.play_store_url,
+          )
+        )
+      }
+
+      addItem(
+        buildElement(
+          R.drawable.about_icon_instagram,
+          R.string.about_instagram,
+          R.string.app_instagram_url
+        )
+      )
+
+      addItem(
+        buildElement(
+          R.drawable.about_icon_twitter,
+          R.string.about_twitter,
+          R.string.app_twitter_url
+        )
+      )
+
+      addItem(
+        buildElement(
+          R.drawable.about_icon_github,
+          R.string.about_github,
+          R.string.app_github_url
+        )
+      )
+
+      addItem(
+        buildElement(
+          R.drawable.about_icon_link,
+          R.string.about_website,
+          R.string.app_website_url
+        )
+      )
+
+      addGroup(getString(R.string.created_by))
+      addTwitter(creatorTwitter, creatorTwitter)
+      create()
+    }
+  }
+
+  override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+    NoiceApplication.of(requireContext())
+      .analyticsProvider
+      .setCurrentScreen("about", AboutFragment::class)
+  }
+
+  private fun buildElement(
+    @DrawableRes iconId: Int,
+    @StringRes titleResId: Int,
+    @StringRes urlResId: Int
+  ): Element {
+    return buildElement(iconId, getString(titleResId), getString(urlResId))
+  }
+
+  private fun buildElement(@DrawableRes iconId: Int, title: String, url: String): Element {
+    return Element(title, iconId)
+      .setAutoApplyIconTint(true)
+      .setOnClickListener { Uri.parse(url).launchInCustomTab(requireContext()) }
+  }
+
+  companion object {
+    private const val creatorTwitter = "ashutoshgngwr"
+  }
+}