Merge pull request #5456 from TeamNewPipe/release_0.20.9

Release 0.20.10

.github/CONTRIBUTING.md

@@ -1,64 +1,46 @@
 NewPipe contribution guidelines
 ===============================
 
-PLEASE READ THESE GUIDELINES CAREFULLY BEFORE ANY CONTRIBUTION!
-
 ## Crash reporting
 
-Do not report crashes in the GitHub issue tracker. NewPipe has an automated crash report system that will ask you to
-send a report via e-mail when a crash occurs. This contains all the data we need for debugging, and allows you to even
-add a comment to it. You'll see exactly what is sent, the system is 100% transparent.
+Report crashes through the automated crash report system of NewPipe.
+This way all the data needed for debugging is included in your bugreport for GitHub.
+You'll see exactly what is sent, be able to add your comments, and then send it.
 
 ## Issue reporting/feature requests
 
-* Search the [existing issues](https://github.com/TeamNewPipe/NewPipe/issues) first to make sure your issue/feature
-hasn't been reported/requested before.
-* Check whether your issue/feature is already fixed/implemented.
-* Check if the issue still exists in the latest release/beta version.
-* If you are an Android/Java developer, you are always welcome to fix an issue or implement a feature yourself. PRs welcome!
-* We use English for development. Issues in other languages will be closed and ignored.
-* Please only add *one* issue at a time. Do not put multiple issues into one thread.
-* Follow the template! Issues or feature requests not matching the template might be closed.
+* **Already reported**? Browse the [existing issues](https://github.com/TeamNewPipe/NewPipe/issues) to make sure your issue/feature hasn't been reported/requested.
+* **Already fixed**? Check whether your issue/feature is already fixed/implemented.
+* **Still relevant**? Check if the issue still exists in the latest release/beta version.
+* **Can you fix it**? If you are an Android/Java developer, you are always welcome to fix an issue or implement a feature yourself. PRs welcome! See [Code contribution](#code-contribution) for more info.
+* **Is it in English**? Issues in other languages will be ignored unless someone translates them.
+* **Is it one issue**? Multiple issues require multiple reports, that can be linked to track their statuses.
+* **The template**: Fill it out, everyone wins. Your issue has a chance of getting fixed.
 
-## Bug Fixing
-* If you want to help NewPipe to become free of bugs (this is our utopic goal for NewPipe), you can send us an email to
-<a href="mailto:tnp@newpipe.schabi.org">tnp@newpipe.schabi.org</a> to let us know that you intend to help. We'll send you further instructions. You may, on request,
-register at our [Sentry](https://sentry.schabi.org) instance (see section "Crash reporting" for more information).
 
 ## Translation
 
-* NewPipe is translated via [Weblate](https://hosted.weblate.org/projects/newpipe/strings/). You can log in there
-with your GitHub account.
-* If the language you want to translate is not on Weblate, you can add it: see [How to add a new language](https://github.com/TeamNewPipe/NewPipe/wiki/How-to-add-a-new-language-to-NewPipe) in the wiki.
+* NewPipe is translated via [Weblate](https://hosted.weblate.org/projects/newpipe/strings/). Log in there with your GitHub account, or register.
+* Add the language you want to translate if it is not there already: see [How to add a new language](https://github.com/TeamNewPipe/NewPipe/wiki/How-to-add-a-new-language-to-NewPipe) in the wiki.
 
 ## Code contribution
 
-* Stick to NewPipe's style conventions: follow [checkStyle](https://github.com/checkstyle/checkstyle). It will run each time you build the project.
-* Do not bring non-free software (e.g. binary blobs) into the project. Also, make sure you do not introduce Google
+* If you want to help out with an existing bug report or feature request, leave a comment on that issue saying you want to try your hand at it.
+* If there is no existing issue for what you want to work on, open a new one describing your changes. This gives the team and the community a chance to give feedback before you spend time on something that is already in development, should be done differently, or should be avoided completely.
+* Stick to NewPipe's style conventions of [checkStyle](https://github.com/checkstyle/checkstyle). It runs each time you build the project.
+* Do not bring non-free software (e.g. binary blobs) into the project. Make sure you do not introduce Google
   libraries.
 * Stick to [F-Droid contribution guidelines](https://f-droid.org/wiki/page/Inclusion_Policy).
-* Make changes on a separate branch with a meaningful name, not on the master neither dev branch. This is commonly known as *feature branch workflow*. You
-  may then send your changes as a pull request (PR) on GitHub.
-* When submitting changes, you confirm that your code is licensed under the terms of the
-  [GNU General Public License v3](https://www.gnu.org/licenses/gpl-3.0.html).
-* Please test (compile and run) your code before you submit changes! Ideally, provide test feedback in the PR
-  description. Untested code will **not** be merged!
+* Make changes on a separate branch with a meaningful name, not on the _master_ branch or the _dev_ branch. This is commonly known as *feature branch workflow*. You may then send your changes as a pull request (PR) on GitHub.
+* Please test (compile and run) your code before submitting changes! Ideally, provide test feedback in the PR description. Untested code will **not** be merged!
+* Make sure your PR is up-to-date with the rest of the code. Often, a simple click on "Update branch" will do the job, but if not, you must rebase the dev branch manually and resolve the problems on your own. You can find help [on the wiki](https://github.com/TeamNewPipe/NewPipe/wiki/How-to-merge-a-PR). That makes the maintainers' jobs way easier.
+* Please show intention to maintain your features and code after you contribute a PR. Unmaintained code is a hassle for core developers. If you do not intend to maintain features you plan to contribute, please rethink your submission, or clearly state that in the PR description.
+* Respond if someone requests changes or otherwise raises issues about your PRs.
+* Send PRs that only cover one specific issue/solution/bug. Do not send PRs that are huge and consist of multiple independent solutions.
 * Try to figure out yourself why builds on our CI fail.
-* Make sure your PR is up-to-date with the rest of the code. Often, a simple click on "Update branch" will do the job,
-  but if not, you are asked to rebase the dev branch manually and resolve the problems on your own. You can find help [on the wiki](https://github.com/TeamNewPipe/NewPipe/wiki/How-to-merge-a-PR). That will make the
-  maintainers' jobs way easier.
-* Please show intention to maintain your features and code after you contributed it. Unmaintained code is a hassle for
-  the core developers, and just adds work. If you do not intend to maintain features you contributed, please think again
-  about submission, or clearly state that in the description of your PR.
-* Respond yourselves if someone requests changes or otherwise raises issues about your PRs.
-* Send PR that only cover one specific issue/solution/bug. Do not send PRs that are huge and consists of multiple
-  independent solutions.
 
 ## Communication
 
-* There is an IRC channel on Freenode which is regularly visited by the core team and other developers:
-  [#newpipe](irc:irc.freenode.net/newpipe). [Click here for Webchat](https://webchat.freenode.net/?channels=newpipe)!
-* If you want to get in touch with the core team or one of our other contributors you can send an email to
-  <a href="mailto:tnp@newpipe.schabi.org">tnp@newpipe.schabi.org</a>. Please do not send issue reports, they will be ignored and remain unanswered! Use the GitHub issue
-  tracker described above!
-* Feel free to post suggestions, changes, ideas etc. on GitHub or IRC!
+* The [#newpipe](irc:irc.freenode.net/newpipe) channel on freenode has the core team and other developers in it. [Click here for webchat](https://webchat.freenode.net/?channels=newpipe)!
+* You can also use a Matrix account to join the Newpipe channel at [#freenode_#newpipe:matrix.org](https://matrix.to/#/#freenode_#newpipe:matrix.org).
+* Post suggestions, changes, ideas etc. on GitHub or IRC.

.github/ISSUE_TEMPLATE/bug_report.md

@@ -7,20 +7,20 @@ assignees: ''
 ---
 
 <!--
-Oh no, a bug! It happens. Thanks for reporting an issue with NewPipe. If this is your first bug report, read the following information before proceeding:
-
-Please note, we only support the latest version of NewPipe. In order to check your app version, open the left drawer and click on "About". If you don't have the latest version, upgrade to it and reproduce the problem before opening the issue. The release page (https://github.com/TeamNewPipe/NewPipe/releases/latest) is where you can get it.
-
-P.S.: Our contribution guidelines might be a nice document to read before you fill out the report :) You can find it at https://github.com/TeamNewPipe/NewPipe/blob/HEAD/.github/CONTRIBUTING.md
-
-To make it easier for us to help you please enter detailed information in the template we have provided below. If a section isn't relevant, just delete it, though it would be helpful to still provide as much detail as possible.
+Oh no, a bug! It happens. Thanks for reporting an issue with NewPipe. To make it easier for us to help you please enter detailed information in the template we have provided below. If a section isn't relevant, just delete it, though it would be helpful to still provide as much detail as possible.
 -->
 
-<!-- The comments between these brackets won't show up in the submitted issue (as you can see in the preview). -->
+<!-- IF YOU DON'T FILL IN THE TEMPLATE PROPERLY, YOUR ISSUE IS LIABLE TO BE CLOSED. If you feel tired/lazy right now, open your issue some other time. We'll wait. -->
 
-### Version
-<!-- Which version are you using? Hopefully the latest! We just told you that above! -->
--
+<!-- The comments between these brackets won't show up in the submitted issue (as you can see in the Preview). -->
+
+### Checklist
+<!-- This checklist is COMPULSORY. The first box has been checked for you to show you how it is done. -->
+
+- [x] I am using the latest version - x.xx.x <!-- Check https://github.com/TeamNewPipe/NewPipe/releases -->
+- [ ] I checked, but didn't find any duplicates (open OR closed) of this issue in the repo. <!-- Seriously, check. O_O -->
+- [ ] I have read the contribution guidelines given at https://github.com/TeamNewPipe/NewPipe/blob/HEAD/.github/CONTRIBUTING.md.
+- [ ] This issue contains only one bug. I will open one issue for every bug report I want to file.
 
 ### Steps to reproduce the bug
 <!--
@@ -31,16 +31,35 @@ To make it easier for us to help you please enter detailed information in the te
 
 <!-- If you can't cause the bug to show up again reliably (and hence don't have a proper set of steps to give us), please still try to give as many details as possible on how you think you encountered the bug. -->
 
+
+
+### Actual behaviour
+<!-- Tell us what happens with the steps given above. -->
+
+
+
 ### Expected behavior
 <!-- Tell us what you expect to happen. -->
 
-### Actual behaviour
-<!-- Tell us what happens instead. -->
+
 
 ### Screenshots/Screen recordings
 <!-- If applicable, add screenshots or a screen recording to help explain your problem. GitHub supports uploading them directly in the issue text box. If your file is too big for Github to accept, feel free to paste a link from an image/video hoster here instead. -->
 
+<!-- DON'T POST SCREENSHOTS OF THE ERROR PAGE. Use the buttons given on the error page to paste the error as text in the Logs section below. -->
+
+
+
 ### Logs
-<!-- If your bug includes a crash (where you're shown the Error Report page with a bunch of info), copy it to the clipboard (there is a share button for this), head over to our bug report to markdown converter at https://teamnewpipe.github.io/CrashReportToMarkdown/ and paste it. Copy the converted text (it is MUCH easier to read this way) from there and paste it here: -->
+<!-- If your bug includes a crash (where you're shown the Error Report page with a bunch of info), tap on "Copy formatted report" at the bottom and paste it here: -->
 
 <!-- That's right, here! -->
+
+
+
+<!-- Please fill this out when you do not provide a log generate by NewPipe -->
+
+### Device info
+
+ - Android version/Custom ROM version:
+ - Device model:

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1 @@
+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/feature_request.md

@@ -5,35 +5,42 @@ labels: enhancement
 assignees: ''
 
 ---
-<!-- Hey. Our contribution guidelines (https://github.com/TeamNewPipe/NewPipe/blob/HEAD/.github/CONTRIBUTING.md) might be an appropriate
- document to read before you fill out the request :) -->
+<!-- IF YOU DON'T FILL IN THE TEMPLATE PROPERLY, YOUR ISSUE IS LIABLE TO BE CLOSED. If you feel tired/lazy right now, open your issue some other time. We'll wait. -->
+
+
+<!-- The comments between these brackets won't show up in the submitted issue (as you can see in the Preview). -->
+
+### Checklist
+<!-- This checklist is COMPULSORY. The first box has been checked for you to show you how it is done. -->
+
+- [x] I checked, but didn't find any duplicates (open OR closed) of this issue in the repo. <!-- Seriously, check. O_O -->
+- [ ] I have read the contribution guidelines given at https://github.com/TeamNewPipe/NewPipe/blob/HEAD/.github/CONTRIBUTING.md.
+- [ ] This issue contains only one feature request. I will open one issue for every feature I want to request.
 
-<!-- The comments between these brackets won't show up in the submitted issue (as you can see in the preview). -->
 
 #### Describe the feature you want
-<!-- A clear and concise description of what you want to happen. PLEASE MAKE SURE it is one feature ONLY. You should open separate issues for separate feature requests, because those issues will be used to track their status.
+<!-- A clear and concise description of what you wish should happen.
 Example: *I think it would be nice if you add feature Y which makes X possible.*
 
 Optionally, also describe alternatives you've considered.
 Example: *Z is also a good alternative. Not as good as Y, but at least...* or *I considered Z, but that didn't turn out to be a good idea because...* -->
 
-<!-- Write below this -->
+
 
 #### Is your feature request related to a problem? Please describe it
-<!-- A clear and concise description of what the problem is. Maybe the developers could brainstorm and come up with a better solution to your problem. If they exist, link to related Issues and/or PRs for developers to keep track easier.
+<!-- A clear and concise description of what the problem is. Maybe the developers and the community could brainstorm and come up with a better solution to your problem. If they exist, link to related Issues and/or PRs for developers to keep track easier.
 Example: *I want to do X, but there is no way to do it.* -->
 
-<!-- Write below this -->
+
 
 #### Additional context
 <!-- Add any other context, like screenshots, about the feature request here.
 Example: *Here's a photo of my cat!* -->
 
-<!-- Write below this -->
+
 
 #### How will you/everyone benefit from this feature?
 <!-- Convince us! How does it change your NewPipe experience and/or your life?
 The better this paragraph is, the more likely a developer will think about working on it.
 Example: *This feature will help us colonize the galaxy! -->
 
-<!-- Write below this -->

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,28 +1,29 @@
-<!-- Hey there. Thank you so much for improving NewPipe. Please take a moment to fill out the following suggestion on how to structure this PR description. Having roughly the same layout helps everyone considerably :)-->
+<!-- Hey there. Thank you so much for improving NewPipe, and filling out the details. Having roughly the same layout helps everyone considerably :)-->
 
 #### What is it?
-- [ ] Bug fix (user facing)
+- [ ] Bugfix (user facing)
 - [ ] Feature (user facing)
-- [ ] Code base improvement (dev facing)
+- [ ] Codebase improvement (dev facing)
 - [ ] Meta improvement to the project (dev facing)
 
 #### Description of the changes in your PR
-<!-- While bullet points are the norm in this section, feel free to write a text instead if you can't fit it in a list -->
+<!-- While bullet points are the norm in this section, feel free to write free-form text instead of a list -->
 - record videos
 - create clones
 - take over the world
 
 #### Fixes the following issue(s)
-<!-- Also add reddit or other links which are relevant to your change. -->
+<!-- Also add any other links relevant to your change. -->
 - 
 
 #### Relies on the following changes
 <!-- Delete this if it doesn't apply to you. -->
 - 
 
-#### Testing apk
-<!-- Ensure that you have your changes on a new branch which has a meaningful name. This name will be used as a suffix for the app ID to allow installing and testing multiple versions of NewPipe. Do NOT name your branches like "patch-0" and "feature-1". For example, if your PR implements a bug fix for comments, an appropriate branch name would be "commentfix". -->
-debug.zip
+#### APK testing 
+<!-- Use a new, meaningfully named branch. The name is used as a suffix for the app ID to allow installing and testing multiple versions of NewPipe, e.g. "commentfix", if your PR implements a bugfix for comments. (No names like "patch-0" and "feature-1".)  -->
+<!-- Remove the following line if you directly link the APK created by the CI pipeline. Directly linking is preferred if you need to let users test.-->
+On the website the APK can be found by going to the "Checks" tab below the title and then on "artifacts" on the right.
 
-#### Agreement
-- [ ] I carefully read the [contribution guidelines](https://github.com/TeamNewPipe/NewPipe/blob/HEAD/.github/CONTRIBUTING.md) and agree to them.
+#### Due diligence
+- [ ] I read the [contribution guidelines](https://github.com/TeamNewPipe/NewPipe/blob/HEAD/.github/CONTRIBUTING.md).

.github/workflows/ci.yml

@@ -0,0 +1,35 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: create and checkout branch
+        # push events already checked out the branch
+        if: github.event_name == 'pull_request'
+        run: git checkout -B ${{ github.head_ref }}
+
+      - name: set up JDK 1.8
+        uses: actions/setup-java@v1.4.3
+        with:
+          java-version: 1.8
+
+      - name: Cache Gradle dependencies
+        uses: actions/cache@v2
+        with:
+          path: ~/.gradle/caches
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}
+          restore-keys: ${{ runner.os }}-gradle
+
+      - name: Build debug APK and run Tests
+        run: ./gradlew assembleDebug lintDebug testDebugUnitTest --stacktrace
+
+      - name: Upload APK
+        uses: actions/upload-artifact@v2
+        with:
+          name: app
+          path: app/build/outputs/apk/debug/*.apk

.travis.yml

@@ -1,18 +0,0 @@
-language: android
-jdk:
-    - oraclejdk8
-android:
-  components:
-    # The BuildTools version used by NewPipe
-    - tools
-    - build-tools-29.0.3
-
-    # The SDK version used to compile NewPipe
-    - android-29
-
-before_install: 
-  - yes | sdkmanager "platforms;android-29"
-script: ./gradlew -Dorg.gradle.jvmargs=-Xmx1536m assembleDebug lintDebug testDebugUnitTest
-
-licenses:
-  - '.+'

app/build.gradle

@@ -13,8 +13,10 @@ android {
         resValue "string", "app_name", "NewPipe"
         minSdkVersion 19
         targetSdkVersion 29
-        versionCode 950
-        versionName "0.19.5"
+        versionCode 964
+        versionName "0.20.10"
+
+        multiDexEnabled true
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         vectorDrawables.useSupportLibrary = true
@@ -28,12 +30,11 @@ android {
 
     buildTypes {
         debug {
-            multiDexEnabled true
             debuggable true
 
             // suffix the app id and the app name with git branch name
             def workingBranch = getGitWorkingBranch()
-            def normalizedWorkingBranch = workingBranch.replaceAll("[^A-Za-z]+", "").toLowerCase()
+            def normalizedWorkingBranch = workingBranch.replaceFirst("^[^A-Za-z]+", "").replaceAll("[^0-9A-Za-z]+", "")
             if (normalizedWorkingBranch.isEmpty() || workingBranch == "master" || workingBranch == "dev") {
                 // default values when branch name could not be determined or is master or dev
                 applicationIdSuffix ".debug"
@@ -50,7 +51,7 @@ android {
         // TODO: update Gradle version
         release {
             minifyEnabled true
-            shrinkResources true
+            shrinkResources false // disabled to fix F-Droid's reproducible build
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
             archivesBaseName = 'app'
         }
@@ -64,11 +65,18 @@ android {
     }
 
     compileOptions {
+        // Flag to enable support for the new language APIs
+        coreLibraryDesugaringEnabled true
+
         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8
         encoding 'utf-8'
     }
 
+    kotlinOptions {
+        jvmTarget = JavaVersion.VERSION_1_8
+    }
+
     // Required and used only by groupie
     androidExtensions {
         experimental = true
@@ -77,18 +85,29 @@ android {
     sourceSets {
         androidTest.assets.srcDirs += files("$projectDir/schemas".toString())
     }
+
+    buildFeatures {
+        viewBinding true
+    }
 }
 
 ext {
     icepickVersion = '3.2.0'
-    checkstyleVersion = '8.32'
+    checkstyleVersion = '8.38'
     stethoVersion = '1.5.1'
-    leakCanaryVersion = '2.2'
-    exoPlayerVersion = '2.11.4'
+    leakCanaryVersion = '2.5'
+    exoPlayerVersion = '2.11.8'
     androidxLifecycleVersion = '2.2.0'
-    androidxRoomVersion = '2.2.5'
-    groupieVersion = '2.8.0'
-    markwonVersion = '4.3.1'
+    androidxRoomVersion = '2.3.0-alpha03'
+    groupieVersion = '2.8.1'
+    markwonVersion = '4.6.0'
+    googleAutoServiceVersion = '1.0-rc7'
+    mockitoVersion = '3.6.0'
+}
+
+configurations {
+    checkstyle
+    ktlint
 }
 
 checkstyle {
@@ -106,8 +125,7 @@ task runCheckstyle(type: Checkstyle) {
     exclude '**/BuildConfig.java'
     exclude 'main/java/us/shandian/giga/**'
 
-    // empty classpath
-    classpath = files()
+    classpath = configurations.checkstyle
 
     showViolations true
 
@@ -117,80 +135,89 @@ task runCheckstyle(type: Checkstyle) {
     }
 }
 
-configurations {
-    ktlint
-}
+def outputDir = "${project.buildDir}/reports/ktlint/"
+def inputFiles = project.fileTree(dir: "src", include: "**/*.kt")
 
 task runKtlint(type: JavaExec) {
+    inputs.files(inputFiles)
+    outputs.dir(outputDir)
     main = "com.pinterest.ktlint.Main"
     classpath = configurations.ktlint
     args "src/**/*.kt"
 }
 
 task formatKtlint(type: JavaExec) {
+    inputs.files(inputFiles)
+    outputs.dir(outputDir)
     main = "com.pinterest.ktlint.Main"
     classpath = configurations.ktlint
     args "-F", "src/**/*.kt"
 }
 
 afterEvaluate {
-    preDebugBuild.dependsOn runCheckstyle, runKtlint
+    preDebugBuild.dependsOn formatKtlint, runCheckstyle, runKtlint
 }
 
 dependencies {
-    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:1.1.1'
+
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:${kotlin_version}"
 
     implementation "frankiesardo:icepick:${icepickVersion}"
     kapt "frankiesardo:icepick-processor:${icepickVersion}"
 
-    debugImplementation "com.puppycrawl.tools:checkstyle:${checkstyleVersion}"
-    ktlint "com.pinterest:ktlint:0.35.0"
+    checkstyle "com.puppycrawl.tools:checkstyle:${checkstyleVersion}"
+    ktlint "com.pinterest:ktlint:0.40.0"
 
     debugImplementation "com.facebook.stetho:stetho:${stethoVersion}"
     debugImplementation "com.facebook.stetho:stetho-okhttp3:${stethoVersion}"
 
     debugImplementation "com.squareup.leakcanary:leakcanary-android:${leakCanaryVersion}"
     implementation "com.squareup.leakcanary:leakcanary-object-watcher-android:${leakCanaryVersion}"
+    implementation "com.squareup.leakcanary:plumber-android:${leakCanaryVersion}"
 
-    debugImplementation "androidx.multidex:multidex:2.0.1"
-
-    testImplementation 'junit:junit:4.13'
-    testImplementation 'org.mockito:mockito-core:3.3.3'
-
-    androidTestImplementation "androidx.test.ext:junit:1.1.1"
-    androidTestImplementation "androidx.room:room-testing:${androidxRoomVersion}"
-    androidTestImplementation "androidx.test.espresso:espresso-core:3.2.0", {
-        exclude module: 'support-annotations'
-    }
-
-    implementation 'com.github.TeamNewPipe:NewPipeExtractor:bda83fe6a5b9a8a0751669fbc444fa49d72d0d2f'
+    implementation "androidx.multidex:multidex:2.0.1"
 
+    // NewPipe dependencies
+    // You can use a local version by uncommenting a few lines in settings.gradle
+    implementation 'com.github.TeamNewPipe:NewPipeExtractor:v0.20.10'
     implementation "com.github.TeamNewPipe:nanojson:1d9e1aea9049fc9f85e68b43ba39fe7be1c1f751"
+
     implementation "org.jsoup:jsoup:1.13.1"
 
-    implementation "com.squareup.okhttp3:okhttp:3.12.11"
+    //noinspection GradleDependency --> do not update okhttp to keep supporting Android 4.4 users
+    implementation "com.squareup.okhttp3:okhttp:3.12.12"
 
     implementation "com.google.android.exoplayer:exoplayer:${exoPlayerVersion}"
     implementation "com.google.android.exoplayer:extension-mediasession:${exoPlayerVersion}"
 
-    implementation "com.google.android.material:material:1.1.0"
+    implementation "com.google.android.material:material:1.2.1"
 
-    implementation "androidx.appcompat:appcompat:1.1.0"
+    compileOnly "com.google.auto.service:auto-service-annotations:${googleAutoServiceVersion}"
+    kapt "com.google.auto.service:auto-service:${googleAutoServiceVersion}"
+
+    implementation "androidx.appcompat:appcompat:1.2.0"
     implementation "androidx.preference:preference:1.1.1"
     implementation "androidx.recyclerview:recyclerview:1.1.0"
     implementation "androidx.cardview:cardview:1.0.0"
-    implementation "androidx.constraintlayout:constraintlayout:1.1.3"
+    implementation "androidx.constraintlayout:constraintlayout:2.0.4"
+    implementation 'androidx.core:core-ktx:1.3.2'
+    implementation 'androidx.documentfile:documentfile:1.0.1'
+    implementation 'androidx.localbroadcastmanager:localbroadcastmanager:1.0.0'
+    implementation 'androidx.media:media:1.2.1'
+    implementation 'androidx.webkit:webkit:1.4.0'
 
     implementation "androidx.lifecycle:lifecycle-livedata:${androidxLifecycleVersion}"
     implementation "androidx.lifecycle:lifecycle-viewmodel:${androidxLifecycleVersion}"
-    implementation "androidx.lifecycle:lifecycle-extensions:${androidxLifecycleVersion}"
 
     implementation "androidx.room:room-runtime:${androidxRoomVersion}"
-    implementation "androidx.room:room-rxjava2:${androidxRoomVersion}"
+    implementation "androidx.room:room-rxjava3:${androidxRoomVersion}"
     kapt "androidx.room:room-compiler:${androidxRoomVersion}"
 
+    implementation "androidx.swiperefreshlayout:swiperefreshlayout:1.1.0"
+
     implementation "com.xwray:groupie:${groupieVersion}"
-    implementation "com.xwray:groupie-kotlin-android-extensions:${groupieVersion}"
+    implementation "com.xwray:groupie-viewbinding:${groupieVersion}"
 
     implementation "de.hdodenhof:circleimageview:3.1.0"
     implementation "com.nostra13.universalimageloader:universal-image-loader:1.9.5"
@@ -200,13 +227,23 @@ dependencies {
 
     implementation "com.nononsenseapps:filepicker:4.2.1"
 
-    implementation "ch.acra:acra-core:5.5.0"
+    implementation "ch.acra:acra-core:5.7.0"
 
-    implementation "io.reactivex.rxjava2:rxjava:2.2.19"
-    implementation "io.reactivex.rxjava2:rxandroid:2.1.1"
-    implementation "com.jakewharton.rxbinding2:rxbinding:2.2.0"
+    implementation "io.reactivex.rxjava3:rxjava:3.0.7"
+    implementation "io.reactivex.rxjava3:rxandroid:3.0.0"
+    implementation "com.jakewharton.rxbinding4:rxbinding:4.0.0"
 
-    implementation "org.ocpsoft.prettytime:prettytime:4.0.5.Final"
+    implementation "org.ocpsoft.prettytime:prettytime:4.0.6.Final"
+
+    testImplementation 'junit:junit:4.13.1'
+    testImplementation "org.mockito:mockito-core:${mockitoVersion}"
+    testImplementation "org.mockito:mockito-inline:${mockitoVersion}"
+
+    androidTestImplementation "androidx.test.ext:junit:1.1.2"
+    androidTestImplementation "androidx.room:room-testing:${androidxRoomVersion}"
+    androidTestImplementation "androidx.test.espresso:espresso-core:3.3.0", {
+        exclude module: 'support-annotations'
+    }
 }
 
 static String getGitWorkingBranch() {

app/src/androidTest/java/org/schabi/newpipe/database/AppDatabaseTest.kt

@@ -31,49 +31,62 @@ class AppDatabaseTest {
     }
 
     @get:Rule
-    val testHelper = MigrationTestHelper(InstrumentationRegistry.getInstrumentation(),
-            AppDatabase::class.java.canonicalName, FrameworkSQLiteOpenHelperFactory())
+    val testHelper = MigrationTestHelper(
+        InstrumentationRegistry.getInstrumentation(),
+        AppDatabase::class.java.canonicalName, FrameworkSQLiteOpenHelperFactory()
+    )
 
     @Test
     fun migrateDatabaseFrom2to3() {
         val databaseInV2 = testHelper.createDatabase(AppDatabase.DATABASE_NAME, Migrations.DB_VER_2)
 
         databaseInV2.run {
-            insert("streams", SQLiteDatabase.CONFLICT_FAIL, ContentValues().apply {
-                // put("uid", null)
-                put("service_id", DEFAULT_SERVICE_ID)
-                put("url", DEFAULT_URL)
-                put("title", DEFAULT_TITLE)
-                put("stream_type", DEFAULT_TYPE.name)
-                put("duration", DEFAULT_DURATION)
-                put("uploader", DEFAULT_UPLOADER_NAME)
-                put("thumbnail_url", DEFAULT_THUMBNAIL)
-            })
-            insert("streams", SQLiteDatabase.CONFLICT_FAIL, ContentValues().apply {
-                // put("uid", null)
-                put("service_id", DEFAULT_SECOND_SERVICE_ID)
-                put("url", DEFAULT_SECOND_URL)
-                // put("title", null)
-                // put("stream_type", null)
-                // put("duration", null)
-                // put("uploader", null)
-                // put("thumbnail_url", null)
-            })
-            insert("streams", SQLiteDatabase.CONFLICT_FAIL, ContentValues().apply {
-                // put("uid", null)
-                put("service_id", DEFAULT_SERVICE_ID)
-                // put("url", null)
-                // put("title", null)
-                // put("stream_type", null)
-                // put("duration", null)
-                // put("uploader", null)
-                // put("thumbnail_url", null)
-            })
+            insert(
+                "streams", SQLiteDatabase.CONFLICT_FAIL,
+                ContentValues().apply {
+                    // put("uid", null)
+                    put("service_id", DEFAULT_SERVICE_ID)
+                    put("url", DEFAULT_URL)
+                    put("title", DEFAULT_TITLE)
+                    put("stream_type", DEFAULT_TYPE.name)
+                    put("duration", DEFAULT_DURATION)
+                    put("uploader", DEFAULT_UPLOADER_NAME)
+                    put("thumbnail_url", DEFAULT_THUMBNAIL)
+                }
+            )
+            insert(
+                "streams", SQLiteDatabase.CONFLICT_FAIL,
+                ContentValues().apply {
+                    // put("uid", null)
+                    put("service_id", DEFAULT_SECOND_SERVICE_ID)
+                    put("url", DEFAULT_SECOND_URL)
+                    // put("title", null)
+                    // put("stream_type", null)
+                    // put("duration", null)
+                    // put("uploader", null)
+                    // put("thumbnail_url", null)
+                }
+            )
+            insert(
+                "streams", SQLiteDatabase.CONFLICT_FAIL,
+                ContentValues().apply {
+                    // put("uid", null)
+                    put("service_id", DEFAULT_SERVICE_ID)
+                    // put("url", null)
+                    // put("title", null)
+                    // put("stream_type", null)
+                    // put("duration", null)
+                    // put("uploader", null)
+                    // put("thumbnail_url", null)
+                }
+            )
             close()
         }
 
-        testHelper.runMigrationsAndValidate(AppDatabase.DATABASE_NAME, Migrations.DB_VER_3,
-                true, Migrations.MIGRATION_2_3)
+        testHelper.runMigrationsAndValidate(
+            AppDatabase.DATABASE_NAME, Migrations.DB_VER_3,
+            true, Migrations.MIGRATION_2_3
+        )
 
         val migratedDatabaseV3 = getMigratedDatabase()
         val listFromDB = migratedDatabaseV3.streamDAO().all.blockingFirst()
@@ -110,9 +123,11 @@ class AppDatabaseTest {
     }
 
     private fun getMigratedDatabase(): AppDatabase {
-        val database: AppDatabase = Room.databaseBuilder(ApplicationProvider.getApplicationContext(),
-                AppDatabase::class.java, AppDatabase.DATABASE_NAME)
-                .build()
+        val database: AppDatabase = Room.databaseBuilder(
+            ApplicationProvider.getApplicationContext(),
+            AppDatabase::class.java, AppDatabase.DATABASE_NAME
+        )
+            .build()
         testHelper.closeWhenFinished(database)
         return database
     }

app/src/androidTest/java/org/schabi/newpipe/report/ErrorInfoTest.java

@@ -8,7 +8,6 @@ import androidx.test.filters.LargeTest;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.schabi.newpipe.R;
-import org.schabi.newpipe.report.ErrorActivity.ErrorInfo;
 
 import static org.junit.Assert.assertEquals;
 
@@ -21,18 +20,18 @@ public class ErrorInfoTest {
 
     @Test
     public void errorInfoTestParcelable() {
-        ErrorInfo info = ErrorInfo.make(UserAction.USER_REPORT, "youtube", "request",
+        final ErrorInfo info = ErrorInfo.make(UserAction.USER_REPORT, "youtube", "request",
                 R.string.general_error);
         // Obtain a Parcel object and write the parcelable object to it:
-        Parcel parcel = Parcel.obtain();
+        final Parcel parcel = Parcel.obtain();
         info.writeToParcel(parcel, 0);
         parcel.setDataPosition(0);
-        ErrorInfo infoFromParcel = ErrorInfo.CREATOR.createFromParcel(parcel);
+        final ErrorInfo infoFromParcel = ErrorInfo.CREATOR.createFromParcel(parcel);
 
-        assertEquals(UserAction.USER_REPORT, infoFromParcel.userAction);
-        assertEquals("youtube", infoFromParcel.serviceName);
-        assertEquals("request", infoFromParcel.request);
-        assertEquals(R.string.general_error, infoFromParcel.message);
+        assertEquals(UserAction.USER_REPORT, infoFromParcel.getUserAction());
+        assertEquals("youtube", infoFromParcel.getServiceName());
+        assertEquals("request", infoFromParcel.getRequest());
+        assertEquals(R.string.general_error, infoFromParcel.getMessage());
 
         parcel.recycle();
     }

app/src/debug/java/org/schabi/newpipe/DebugApp.kt

@@ -1,7 +1,5 @@
 package org.schabi.newpipe
 
-import android.content.Context
-import androidx.multidex.MultiDex
 import androidx.preference.PreferenceManager
 import com.facebook.stetho.Stetho
 import com.facebook.stetho.okhttp3.StethoInterceptor
@@ -11,25 +9,28 @@ import okhttp3.OkHttpClient
 import org.schabi.newpipe.extractor.downloader.Downloader
 
 class DebugApp : App() {
-    override fun attachBaseContext(base: Context) {
-        super.attachBaseContext(base)
-        MultiDex.install(this)
-    }
-
     override fun onCreate() {
         super.onCreate()
         initStetho()
 
         // Give each object 10 seconds to be GC'ed, before LeakCanary gets nosy on it
         AppWatcher.config = AppWatcher.config.copy(watchDurationMillis = 10000)
-        LeakCanary.config = LeakCanary.config.copy(dumpHeap = PreferenceManager
-                .getDefaultSharedPreferences(this).getBoolean(getString(
-                        R.string.allow_heap_dumping_key), false))
+        LeakCanary.config = LeakCanary.config.copy(
+            dumpHeap = PreferenceManager
+                .getDefaultSharedPreferences(this).getBoolean(
+                    getString(
+                        R.string.allow_heap_dumping_key
+                    ),
+                    false
+                )
+        )
     }
 
     override fun getDownloader(): Downloader {
-        val downloader = DownloaderImpl.init(OkHttpClient.Builder()
-                .addNetworkInterceptor(StethoInterceptor()))
+        val downloader = DownloaderImpl.init(
+            OkHttpClient.Builder()
+                .addNetworkInterceptor(StethoInterceptor())
+        )
         setCookiesToDownloader(downloader)
         return downloader
     }
@@ -43,7 +44,8 @@ class DebugApp : App() {
 
         // Enable command line interface
         initializerBuilder.enableDumpapp(
-                Stetho.defaultDumperPluginsProvider(applicationContext))
+            Stetho.defaultDumperPluginsProvider(applicationContext)
+        )
 
         // Use the InitializerBuilder to generate an Initializer
         val initializer = initializerBuilder.build()
@@ -54,6 +56,6 @@ class DebugApp : App() {
 
     override fun isDisposedRxExceptionsReported(): Boolean {
         return PreferenceManager.getDefaultSharedPreferences(this)
-                .getBoolean(getString(R.string.allow_disposed_exceptions_key), false)
+            .getBoolean(getString(R.string.allow_disposed_exceptions_key), false)
     }
 }

app/src/debug/java/org/schabi/newpipe/settings/DebugSettingsFragment.java

@@ -0,0 +1,27 @@
+package org.schabi.newpipe.settings;
+
+import android.os.Bundle;
+
+import androidx.annotation.Nullable;
+
+import org.schabi.newpipe.R;
+
+import leakcanary.LeakCanary;
+
+public class DebugSettingsFragment extends BasePreferenceFragment {
+    @Override
+    public void onCreate(@Nullable final Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        findPreference(getString(R.string.show_memory_leaks_key))
+                .setOnPreferenceClickListener(preference -> {
+                    startActivity(LeakCanary.INSTANCE.newLeakDisplayActivityIntent());
+                    return true;
+                });
+    }
+
+    @Override
+    public void onCreatePreferences(final Bundle savedInstanceState, final String rootKey) {
+        addPreferencesFromResource(R.xml.debug_settings);
+    }
+}

app/src/debug/res/xml/main_settings.xml

@@ -1,51 +1,56 @@
 <?xml version="1.0" encoding="utf-8"?>
-<PreferenceScreen
-    xmlns:android="http://schemas.android.com/apk/res/android"
+<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:key="general_preferences"
     android:title="@string/settings">
 
     <PreferenceScreen
-        app:iconSpaceReserved="false"
         android:fragment="org.schabi.newpipe.settings.VideoAudioSettingsFragment"
         android:icon="?attr/ic_headset"
-        android:title="@string/settings_category_video_audio_title"/>
+        android:title="@string/settings_category_video_audio_title"
+        app:iconSpaceReserved="false" />
 
     <PreferenceScreen
-        app:iconSpaceReserved="false"
         android:fragment="org.schabi.newpipe.settings.DownloadSettingsFragment"
         android:icon="?attr/ic_file_download"
-        android:title="@string/settings_category_downloads_title"/>
+        android:title="@string/settings_category_downloads_title"
+        app:iconSpaceReserved="false" />
 
     <PreferenceScreen
-        app:iconSpaceReserved="false"
         android:fragment="org.schabi.newpipe.settings.AppearanceSettingsFragment"
         android:icon="?attr/ic_palette"
-        android:title="@string/settings_category_appearance_title"/>
+        android:title="@string/settings_category_appearance_title"
+        app:iconSpaceReserved="false" />
 
     <PreferenceScreen
-        app:iconSpaceReserved="false"
         android:fragment="org.schabi.newpipe.settings.HistorySettingsFragment"
         android:icon="?attr/ic_history"
-        android:title="@string/settings_category_history_title"/>
+        android:title="@string/settings_category_history_title"
+        app:iconSpaceReserved="false" />
 
     <PreferenceScreen
-        app:iconSpaceReserved="false"
         android:fragment="org.schabi.newpipe.settings.ContentSettingsFragment"
         android:icon="?attr/ic_language"
-        android:title="@string/content"/>
+        android:title="@string/content"
+        app:iconSpaceReserved="false" />
+
+    <PreferenceScreen
+        android:fragment="org.schabi.newpipe.settings.NotificationSettingsFragment"
+        android:icon="?attr/ic_play_arrow"
+        android:title="@string/settings_category_notification_title"
+        app:iconSpaceReserved="false" />
 
     <PreferenceScreen
-        app:iconSpaceReserved="false"
         android:fragment="org.schabi.newpipe.settings.UpdateSettingsFragment"
         android:icon="?attr/ic_settings_update"
+        android:key="update_pref_screen_key"
         android:title="@string/settings_category_updates_title"
-        android:key="update_pref_screen_key"/>
+        app:iconSpaceReserved="false" />
 
     <PreferenceScreen
-        app:iconSpaceReserved="false"
         android:fragment="org.schabi.newpipe.settings.DebugSettingsFragment"
         android:icon="?attr/ic_bug_report"
+        android:key="@string/debug_pref_screen_key"
         android:title="@string/settings_category_debug_title"
-        android:key="@string/debug_pref_screen_key"/>
+        app:iconSpaceReserved="false" />
 </PreferenceScreen>

app/src/main/assets/epl1.html

@@ -0,0 +1,245 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
+        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<!-- saved from url=(0050)https://www.eclipse.org/org/documents/epl-v10.html -->
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+    <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
+
+    <title>Eclipse Public License - Version 1.0</title>
+
+</head>
+
+<body cz-shortcut-listen="true" lang="EN-US">
+
+<h2>Eclipse Public License - v 1.0</h2>
+
+<p>THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE
+    PUBLIC LICENSE ("AGREEMENT"). ANY USE, REPRODUCTION OR
+    DISTRIBUTION OF THE PROGRAM CONSTITUTES RECIPIENT'S ACCEPTANCE OF THIS
+    AGREEMENT.</p>
+
+<p><b>1. DEFINITIONS</b></p>
+
+<p>"Contribution" means:</p>
+
+<p class="list">a) in the case of the initial Contributor, the initial
+    code and documentation distributed under this Agreement, and</p>
+<p class="list">b) in the case of each subsequent Contributor:</p>
+<p class="list">i) changes to the Program, and</p>
+<p class="list">ii) additions to the Program;</p>
+<p class="list">where such changes and/or additions to the Program
+    originate from and are distributed by that particular Contributor. A
+    Contribution 'originates' from a Contributor if it was added to the
+    Program by such Contributor itself or anyone acting on such
+    Contributor's behalf. Contributions do not include additions to the
+    Program which: (i) are separate modules of software distributed in
+    conjunction with the Program under their own license agreement, and (ii)
+    are not derivative works of the Program.</p>
+
+<p>"Contributor" means any person or entity that distributes
+    the Program.</p>
+
+<p>"Licensed Patents" mean patent claims licensable by a
+    Contributor which are necessarily infringed by the use or sale of its
+    Contribution alone or when combined with the Program.</p>
+
+<p>"Program" means the Contributions distributed in accordance
+    with this Agreement.</p>
+
+<p>"Recipient" means anyone who receives the Program under
+    this Agreement, including all Contributors.</p>
+
+<p><b>2. GRANT OF RIGHTS</b></p>
+
+<p class="list">a) Subject to the terms of this Agreement, each
+    Contributor hereby grants Recipient a non-exclusive, worldwide,
+    royalty-free copyright license to reproduce, prepare derivative works
+    of, publicly display, publicly perform, distribute and sublicense the
+    Contribution of such Contributor, if any, and such derivative works, in
+    source code and object code form.</p>
+
+<p class="list">b) Subject to the terms of this Agreement, each
+    Contributor hereby grants Recipient a non-exclusive, worldwide,
+    royalty-free patent license under Licensed Patents to make, use, sell,
+    offer to sell, import and otherwise transfer the Contribution of such
+    Contributor, if any, in source code and object code form. This patent
+    license shall apply to the combination of the Contribution and the
+    Program if, at the time the Contribution is added by the Contributor,
+    such addition of the Contribution causes such combination to be covered
+    by the Licensed Patents. The patent license shall not apply to any other
+    combinations which include the Contribution. No hardware per se is
+    licensed hereunder.</p>
+
+<p class="list">c) Recipient understands that although each Contributor
+    grants the licenses to its Contributions set forth herein, no assurances
+    are provided by any Contributor that the Program does not infringe the
+    patent or other intellectual property rights of any other entity. Each
+    Contributor disclaims any liability to Recipient for claims brought by
+    any other entity based on infringement of intellectual property rights
+    or otherwise. As a condition to exercising the rights and licenses
+    granted hereunder, each Recipient hereby assumes sole responsibility to
+    secure any other intellectual property rights needed, if any. For
+    example, if a third party patent license is required to allow Recipient
+    to distribute the Program, it is Recipient's responsibility to acquire
+    that license before distributing the Program.</p>
+
+<p class="list">d) Each Contributor represents that to its knowledge it
+    has sufficient copyright rights in its Contribution, if any, to grant
+    the copyright license set forth in this Agreement.</p>
+
+<p><b>3. REQUIREMENTS</b></p>
+
+<p>A Contributor may choose to distribute the Program in object code
+    form under its own license agreement, provided that:</p>
+
+<p class="list">a) it complies with the terms and conditions of this
+    Agreement; and</p>
+
+<p class="list">b) its license agreement:</p>
+
+<p class="list">i) effectively disclaims on behalf of all Contributors
+    all warranties and conditions, express and implied, including warranties
+    or conditions of title and non-infringement, and implied warranties or
+    conditions of merchantability and fitness for a particular purpose;</p>
+
+<p class="list">ii) effectively excludes on behalf of all Contributors
+    all liability for damages, including direct, indirect, special,
+    incidental and consequential damages, such as lost profits;</p>
+
+<p class="list">iii) states that any provisions which differ from this
+    Agreement are offered by that Contributor alone and not by any other
+    party; and</p>
+
+<p class="list">iv) states that source code for the Program is available
+    from such Contributor, and informs licensees how to obtain it in a
+    reasonable manner on or through a medium customarily used for software
+    exchange.</p>
+
+<p>When the Program is made available in source code form:</p>
+
+<p class="list">a) it must be made available under this Agreement; and</p>
+
+<p class="list">b) a copy of this Agreement must be included with each
+    copy of the Program.</p>
+
+<p>Contributors may not remove or alter any copyright notices contained
+    within the Program.</p>
+
+<p>Each Contributor must identify itself as the originator of its
+    Contribution, if any, in a manner that reasonably allows subsequent
+    Recipients to identify the originator of the Contribution.</p>
+
+<p><b>4. COMMERCIAL DISTRIBUTION</b></p>
+
+<p>Commercial distributors of software may accept certain
+    responsibilities with respect to end users, business partners and the
+    like. While this license is intended to facilitate the commercial use of
+    the Program, the Contributor who includes the Program in a commercial
+    product offering should do so in a manner which does not create
+    potential liability for other Contributors. Therefore, if a Contributor
+    includes the Program in a commercial product offering, such Contributor
+    ("Commercial Contributor") hereby agrees to defend and
+    indemnify every other Contributor ("Indemnified Contributor")
+    against any losses, damages and costs (collectively "Losses")
+    arising from claims, lawsuits and other legal actions brought by a third
+    party against the Indemnified Contributor to the extent caused by the
+    acts or omissions of such Commercial Contributor in connection with its
+    distribution of the Program in a commercial product offering. The
+    obligations in this section do not apply to any claims or Losses
+    relating to any actual or alleged intellectual property infringement. In
+    order to qualify, an Indemnified Contributor must: a) promptly notify
+    the Commercial Contributor in writing of such claim, and b) allow the
+    Commercial Contributor to control, and cooperate with the Commercial
+    Contributor in, the defense and any related settlement negotiations. The
+    Indemnified Contributor may participate in any such claim at its own
+    expense.</p>
+
+<p>For example, a Contributor might include the Program in a commercial
+    product offering, Product X. That Contributor is then a Commercial
+    Contributor. If that Commercial Contributor then makes performance
+    claims, or offers warranties related to Product X, those performance
+    claims and warranties are such Commercial Contributor's responsibility
+    alone. Under this section, the Commercial Contributor would have to
+    defend claims against the other Contributors related to those
+    performance claims and warranties, and if a court requires any other
+    Contributor to pay any damages as a result, the Commercial Contributor
+    must pay those damages.</p>
+
+<p><b>5. NO WARRANTY</b></p>
+
+<p>EXCEPT AS EXPRESSLY SET FORTH IN THIS AGREEMENT, THE PROGRAM IS
+    PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
+    OF ANY KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT LIMITATION,
+    ANY WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT, MERCHANTABILITY
+    OR FITNESS FOR A PARTICULAR PURPOSE. Each Recipient is solely
+    responsible for determining the appropriateness of using and
+    distributing the Program and assumes all risks associated with its
+    exercise of rights under this Agreement , including but not limited to
+    the risks and costs of program errors, compliance with applicable laws,
+    damage to or loss of data, programs or equipment, and unavailability or
+    interruption of operations.</p>
+
+<p><b>6. DISCLAIMER OF LIABILITY</b></p>
+
+<p>EXCEPT AS EXPRESSLY SET FORTH IN THIS AGREEMENT, NEITHER RECIPIENT
+    NOR ANY CONTRIBUTORS SHALL HAVE ANY LIABILITY FOR ANY DIRECT, INDIRECT,
+    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING
+    WITHOUT LIMITATION LOST PROFITS), HOWEVER CAUSED AND ON ANY THEORY OF
+    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OR
+    DISTRIBUTION OF THE PROGRAM OR THE EXERCISE OF ANY RIGHTS GRANTED
+    HEREUNDER, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.</p>
+
+<p><b>7. GENERAL</b></p>
+
+<p>If any provision of this Agreement is invalid or unenforceable under
+    applicable law, it shall not affect the validity or enforceability of
+    the remainder of the terms of this Agreement, and without further action
+    by the parties hereto, such provision shall be reformed to the minimum
+    extent necessary to make such provision valid and enforceable.</p>
+
+<p>If Recipient institutes patent litigation against any entity
+    (including a cross-claim or counterclaim in a lawsuit) alleging that the
+    Program itself (excluding combinations of the Program with other
+    software or hardware) infringes such Recipient's patent(s), then such
+    Recipient's rights granted under Section 2(b) shall terminate as of the
+    date such litigation is filed.</p>
+
+<p>All Recipient's rights under this Agreement shall terminate if it
+    fails to comply with any of the material terms or conditions of this
+    Agreement and does not cure such failure in a reasonable period of time
+    after becoming aware of such noncompliance. If all Recipient's rights
+    under this Agreement terminate, Recipient agrees to cease use and
+    distribution of the Program as soon as reasonably practicable. However,
+    Recipient's obligations under this Agreement and any licenses granted by
+    Recipient relating to the Program shall continue and survive.</p>
+
+<p>Everyone is permitted to copy and distribute copies of this
+    Agreement, but in order to avoid inconsistency the Agreement is
+    copyrighted and may only be modified in the following manner. The
+    Agreement Steward reserves the right to publish new versions (including
+    revisions) of this Agreement from time to time. No one other than the
+    Agreement Steward has the right to modify this Agreement. The Eclipse
+    Foundation is the initial Agreement Steward. The Eclipse Foundation may
+    assign the responsibility to serve as the Agreement Steward to a
+    suitable separate entity. Each new version of the Agreement will be
+    given a distinguishing version number. The Program (including
+    Contributions) may always be distributed subject to the version of the
+    Agreement under which it was received. In addition, after a new version
+    of the Agreement is published, Contributor may elect to distribute the
+    Program (including its Contributions) under the new version. Except as
+    expressly stated in Sections 2(a) and 2(b) above, Recipient receives no
+    rights or licenses to the intellectual property of any Contributor under
+    this Agreement, whether expressly, by implication, estoppel or
+    otherwise. All rights in the Program not expressly granted under this
+    Agreement are reserved.</p>
+
+<p>This Agreement is governed by the laws of the State of New York and
+    the intellectual property laws of the United States of America. No party
+    to this Agreement will bring a legal action under this Agreement more
+    than one year after the cause of action arose. Each party waives its
+    rights to a jury trial in any resulting litigation.</p>
+
+
+</body>
+</html>

app/src/main/java/androidx/fragment/app/FragmentStatePagerAdapterMenuWorkaround.java

@@ -86,8 +86,8 @@ public abstract class FragmentStatePagerAdapterMenuWorkaround extends PagerAdapt
     private final int mBehavior;
     private FragmentTransaction mCurTransaction = null;
 
-    private ArrayList<Fragment.SavedState> mSavedState = new ArrayList<Fragment.SavedState>();
-    private ArrayList<Fragment> mFragments = new ArrayList<Fragment>();
+    private final ArrayList<Fragment.SavedState> mSavedState = new ArrayList<Fragment.SavedState>();
+    private final ArrayList<Fragment> mFragments = new ArrayList<Fragment>();
     private Fragment mCurrentPrimaryItem = null;
 
     /**
@@ -150,7 +150,7 @@ public abstract class FragmentStatePagerAdapterMenuWorkaround extends PagerAdapt
         // from its saved state, where the fragment manager has already
         // taken care of restoring the fragments we previously had instantiated.
         if (mFragments.size() > position) {
-            Fragment f = mFragments.get(position);
+            final Fragment f = mFragments.get(position);
             if (f != null) {
                 return f;
             }
@@ -160,12 +160,12 @@ public abstract class FragmentStatePagerAdapterMenuWorkaround extends PagerAdapt
             mCurTransaction = mFragmentManager.beginTransaction();
         }
 
-        Fragment fragment = getItem(position);
+        final Fragment fragment = getItem(position);
         if (DEBUG) {
             Log.v(TAG, "Adding item #" + position + ": f=" + fragment);
         }
         if (mSavedState.size() > position) {
-            Fragment.SavedState fss = mSavedState.get(position);
+            final Fragment.SavedState fss = mSavedState.get(position);
             if (fss != null) {
                 fragment.setInitialSavedState(fss);
             }
@@ -191,7 +191,7 @@ public abstract class FragmentStatePagerAdapterMenuWorkaround extends PagerAdapt
     @Override
     public void destroyItem(@NonNull final ViewGroup container, final int position,
                             @NonNull final Object object) {
-        Fragment fragment = (Fragment) object;
+        final Fragment fragment = (Fragment) object;
 
         if (mCurTransaction == null) {
             mCurTransaction = mFragmentManager.beginTransaction();
@@ -217,7 +217,7 @@ public abstract class FragmentStatePagerAdapterMenuWorkaround extends PagerAdapt
     @SuppressWarnings({"ReferenceEquality", "deprecation"})
     public void setPrimaryItem(@NonNull final ViewGroup container, final int position,
                                @NonNull final Object object) {
-        Fragment fragment = (Fragment) object;
+        final Fragment fragment = (Fragment) object;
         if (fragment != mCurrentPrimaryItem) {
             if (mCurrentPrimaryItem != null) {
                 mCurrentPrimaryItem.setMenuVisibility(false);
@@ -267,17 +267,17 @@ public abstract class FragmentStatePagerAdapterMenuWorkaround extends PagerAdapt
         Bundle state = null;
         if (mSavedState.size() > 0) {
             state = new Bundle();
-            Fragment.SavedState[] fss = new Fragment.SavedState[mSavedState.size()];
+            final Fragment.SavedState[] fss = new Fragment.SavedState[mSavedState.size()];
             mSavedState.toArray(fss);
             state.putParcelableArray("states", fss);
         }
         for (int i = 0; i < mFragments.size(); i++) {
-            Fragment f = mFragments.get(i);
+            final Fragment f = mFragments.get(i);
             if (f != null && f.isAdded()) {
                 if (state == null) {
                     state = new Bundle();
                 }
-                String key = "f" + i;
+                final String key = "f" + i;
                 mFragmentManager.putFragment(state, key, f);
 
                 //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
@@ -294,21 +294,21 @@ public abstract class FragmentStatePagerAdapterMenuWorkaround extends PagerAdapt
     @Override
     public void restoreState(@Nullable final Parcelable state, @Nullable final ClassLoader loader) {
         if (state != null) {
-            Bundle bundle = (Bundle) state;
+            final Bundle bundle = (Bundle) state;
             bundle.setClassLoader(loader);
-            Parcelable[] fss = bundle.getParcelableArray("states");
+            final Parcelable[] fss = bundle.getParcelableArray("states");
             mSavedState.clear();
             mFragments.clear();
             if (fss != null) {
-                for (int i = 0; i < fss.length; i++) {
-                    mSavedState.add((Fragment.SavedState) fss[i]);
+                for (final Parcelable parcelable : fss) {
+                    mSavedState.add((Fragment.SavedState) parcelable);
                 }
             }
-            Iterable<String> keys = bundle.keySet();
-            for (String key: keys) {
+            final Iterable<String> keys = bundle.keySet();
+            for (final String key : keys) {
                 if (key.startsWith("f")) {
-                    int index = Integer.parseInt(key.substring(1));
-                    Fragment f = mFragmentManager.getFragment(bundle, key);
+                    final int index = Integer.parseInt(key.substring(1));
+                    final Fragment f = mFragmentManager.getFragment(bundle, key);
                     if (f != null) {
                         while (mFragments.size() <= index) {
                             mFragments.add(null);

app/src/main/java/com/google/android/material/appbar/FlingBehavior.java

@@ -4,13 +4,18 @@ import android.content.Context;
 import android.graphics.Rect;
 import android.util.AttributeSet;
 import android.view.MotionEvent;
+import android.view.View;
 import android.widget.OverScroller;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.coordinatorlayout.widget.CoordinatorLayout;
 
+import org.schabi.newpipe.R;
+
 import java.lang.reflect.Field;
+import java.util.Arrays;
+import java.util.List;
 
 // See https://stackoverflow.com/questions/56849221#57997489
 public final class FlingBehavior extends AppBarLayout.Behavior {
@@ -20,23 +25,28 @@ public final class FlingBehavior extends AppBarLayout.Behavior {
         super(context, attrs);
     }
 
+    private boolean allowScroll = true;
+    private final Rect globalRect = new Rect();
+    private final List<Integer> skipInterceptionOfElements = Arrays.asList(
+            R.id.itemsListPanel, R.id.playbackSeekBar,
+            R.id.playPauseButton, R.id.playPreviousButton, R.id.playNextButton);
+
     @Override
     public boolean onRequestChildRectangleOnScreen(
             @NonNull final CoordinatorLayout coordinatorLayout, @NonNull final AppBarLayout child,
             @NonNull final Rect rectangle, final boolean immediate) {
-
         focusScrollRect.set(rectangle);
 
         coordinatorLayout.offsetDescendantRectToMyCoords(child, focusScrollRect);
 
-        int height = coordinatorLayout.getHeight();
+        final int height = coordinatorLayout.getHeight();
 
         if (focusScrollRect.top <= 0 && focusScrollRect.bottom >= height) {
             // the child is too big to fit inside ourselves completely, ignore request
             return false;
         }
 
-        int dy;
+        final int dy;
 
         if (focusScrollRect.bottom > height) {
             dy =  focusScrollRect.top;
@@ -48,13 +58,24 @@ public final class FlingBehavior extends AppBarLayout.Behavior {
             return false;
         }
 
-        int consumed = scroll(coordinatorLayout, child, dy, getMaxDragOffset(child), 0);
+        final int consumed = scroll(coordinatorLayout, child, dy, getMaxDragOffset(child), 0);
 
         return consumed == dy;
     }
 
     public boolean onInterceptTouchEvent(final CoordinatorLayout parent, final AppBarLayout child,
                                          final MotionEvent ev) {
+        for (final Integer element : skipInterceptionOfElements) {
+            final View view = child.findViewById(element);
+            if (view != null) {
+                final boolean visible = view.getGlobalVisibleRect(globalRect);
+                if (visible && globalRect.contains((int) ev.getRawX(), (int) ev.getRawY())) {
+                    allowScroll = false;
+                    return false;
+                }
+            }
+        }
+        allowScroll = true;
         switch (ev.getActionMasked()) {
             case MotionEvent.ACTION_DOWN:
                 // remove reference to old nested scrolling child
@@ -68,17 +89,37 @@ public final class FlingBehavior extends AppBarLayout.Behavior {
         return super.onInterceptTouchEvent(parent, child, ev);
     }
 
+    @Override
+    public boolean onStartNestedScroll(@NonNull final CoordinatorLayout parent,
+                                       @NonNull final AppBarLayout child,
+                                       @NonNull final View directTargetChild,
+                                       final View target,
+                                       final int nestedScrollAxes,
+                                       final int type) {
+        return allowScroll && super.onStartNestedScroll(
+                parent, child, directTargetChild, target, nestedScrollAxes, type);
+    }
+
+    @Override
+    public boolean onNestedFling(@NonNull final CoordinatorLayout coordinatorLayout,
+                                 @NonNull final AppBarLayout child,
+                                 @NonNull final View target, final float velocityX,
+                                 final float velocityY, final boolean consumed) {
+        return allowScroll && super.onNestedFling(
+                coordinatorLayout, child, target, velocityX, velocityY, consumed);
+    }
+
     @Nullable
     private OverScroller getScrollerField() {
         try {
-            Class<?> headerBehaviorType = this.getClass()
+            final Class<?> headerBehaviorType = this.getClass()
                     .getSuperclass().getSuperclass().getSuperclass();
             if (headerBehaviorType != null) {
-                Field field = headerBehaviorType.getDeclaredField("scroller");
+                final Field field = headerBehaviorType.getDeclaredField("scroller");
                 field.setAccessible(true);
                 return ((OverScroller) field.get(this));
             }
-        } catch (NoSuchFieldException | IllegalAccessException e) {
+        } catch (final NoSuchFieldException | IllegalAccessException e) {
             // ?
         }
         return null;
@@ -87,34 +128,35 @@ public final class FlingBehavior extends AppBarLayout.Behavior {
     @Nullable
     private Field getLastNestedScrollingChildRefField() {
         try {
-            Class<?> headerBehaviorType = this.getClass().getSuperclass().getSuperclass();
+            final Class<?> headerBehaviorType = this.getClass().getSuperclass().getSuperclass();
             if (headerBehaviorType != null) {
-                Field field = headerBehaviorType.getDeclaredField("lastNestedScrollingChildRef");
+                final Field field
+                        = headerBehaviorType.getDeclaredField("lastNestedScrollingChildRef");
                 field.setAccessible(true);
                 return field;
             }
-        } catch (NoSuchFieldException e) {
+        } catch (final NoSuchFieldException e) {
             // ?
         }
         return null;
     }
 
     private void resetNestedScrollingChild() {
-        Field field = getLastNestedScrollingChildRefField();
+        final Field field = getLastNestedScrollingChildRefField();
         if (field != null) {
             try {
-                Object value = field.get(this);
+                final Object value = field.get(this);
                 if (value != null) {
                     field.set(this, null);
                 }
-            } catch (IllegalAccessException e) {
+            } catch (final IllegalAccessException e) {
                 // ?
             }
         }
     }
 
     private void stopAppBarLayoutFling() {
-        OverScroller scroller = getScrollerField();
+        final OverScroller scroller = getScrollerField();
         if (scroller != null) {
             scroller.forceFinished(true);
         }

app/src/main/java/org/schabi/newpipe/App.java

@@ -1,7 +1,5 @@
 package org.schabi.newpipe;
 
-import android.annotation.TargetApi;
-import android.app.Application;
 import android.app.NotificationChannel;
 import android.app.NotificationManager;
 import android.content.Context;
@@ -9,6 +7,9 @@ import android.content.SharedPreferences;
 import android.os.Build;
 import android.util.Log;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.multidex.MultiDexApplication;
 import androidx.preference.PreferenceManager;
 
 import com.nostra13.universalimageloader.cache.memory.impl.LRULimitedMemoryCache;
@@ -19,14 +20,13 @@ import org.acra.ACRA;
 import org.acra.config.ACRAConfigurationException;
 import org.acra.config.CoreConfiguration;
 import org.acra.config.CoreConfigurationBuilder;
-import org.acra.sender.ReportSenderFactory;
 import org.schabi.newpipe.extractor.NewPipe;
 import org.schabi.newpipe.extractor.downloader.Downloader;
-import org.schabi.newpipe.report.AcraReportSenderFactory;
+import org.schabi.newpipe.ktx.ExceptionUtils;
 import org.schabi.newpipe.report.ErrorActivity;
+import org.schabi.newpipe.report.ErrorInfo;
 import org.schabi.newpipe.report.UserAction;
 import org.schabi.newpipe.settings.SettingsActivity;
-import org.schabi.newpipe.util.ExceptionUtils;
 import org.schabi.newpipe.util.Localization;
 import org.schabi.newpipe.util.ServiceHelper;
 import org.schabi.newpipe.util.StateSaver;
@@ -34,16 +34,17 @@ import org.schabi.newpipe.util.StateSaver;
 import java.io.IOException;
 import java.io.InterruptedIOException;
 import java.net.SocketException;
+import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
 
-import io.reactivex.annotations.NonNull;
-import io.reactivex.exceptions.CompositeException;
-import io.reactivex.exceptions.MissingBackpressureException;
-import io.reactivex.exceptions.OnErrorNotImplementedException;
-import io.reactivex.exceptions.UndeliverableException;
-import io.reactivex.functions.Consumer;
-import io.reactivex.plugins.RxJavaPlugins;
+import io.reactivex.rxjava3.disposables.Disposable;
+import io.reactivex.rxjava3.exceptions.CompositeException;
+import io.reactivex.rxjava3.exceptions.MissingBackpressureException;
+import io.reactivex.rxjava3.exceptions.OnErrorNotImplementedException;
+import io.reactivex.rxjava3.exceptions.UndeliverableException;
+import io.reactivex.rxjava3.functions.Consumer;
+import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
 /*
  * Copyright (C) Hans-Christoph Steiner 2016 <hans@eds.org>
@@ -63,13 +64,15 @@ import io.reactivex.plugins.RxJavaPlugins;
  * along with NewPipe.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-public class App extends Application {
+public class App extends MultiDexApplication {
     protected static final String TAG = App.class.toString();
-    @SuppressWarnings("unchecked")
-    private static final Class<? extends ReportSenderFactory>[]
-            REPORT_SENDER_FACTORY_CLASSES = new Class[]{AcraReportSenderFactory.class};
     private static App app;
+    public static final String PACKAGE_NAME = BuildConfig.APPLICATION_ID;
 
+    @Nullable
+    private Disposable disposable = null;
+
+    @NonNull
     public static App getApp() {
         return app;
     }
@@ -77,7 +80,6 @@ public class App extends Application {
     @Override
     protected void attachBaseContext(final Context base) {
         super.attachBaseContext(base);
-
         initACRA();
     }
 
@@ -91,12 +93,12 @@ public class App extends Application {
         SettingsActivity.initSettings(this);
 
         NewPipe.init(getDownloader(),
-                Localization.getPreferredLocalization(this),
-                Localization.getPreferredContentCountry(this));
-        Localization.init(getApplicationContext());
+            Localization.getPreferredLocalization(this),
+            Localization.getPreferredContentCountry(this));
+        Localization.initPrettyTime(Localization.resolvePrettyTime(getApplicationContext()));
 
         StateSaver.init(this);
-        initNotificationChannel();
+        initNotificationChannels();
 
         ServiceHelper.initServices(this);
 
@@ -106,11 +108,19 @@ public class App extends Application {
         configureRxJavaErrorHandler();
 
         // Check for new version
-        new CheckForNewAppVersionTask().execute();
+        disposable = CheckForNewAppVersion.checkNewVersion(this);
+    }
+
+    @Override
+    public void onTerminate() {
+        if (disposable != null) {
+            disposable.dispose();
+        }
+        super.onTerminate();
     }
 
     protected Downloader getDownloader() {
-        DownloaderImpl downloader = DownloaderImpl.init(null);
+        final DownloaderImpl downloader = DownloaderImpl.init(null);
         setCookiesToDownloader(downloader);
         return downloader;
     }
@@ -200,67 +210,65 @@ public class App extends Application {
                 .build();
     }
 
-    private void initACRA() {
+    /**
+     * Called in {@link #attachBaseContext(Context)} after calling the {@code super} method.
+     * Should be overridden if MultiDex is enabled, since it has to be initialized before ACRA.
+     */
+    protected void initACRA() {
+        if (ACRA.isACRASenderServiceProcess()) {
+            return;
+        }
+
         try {
             final CoreConfiguration acraConfig = new CoreConfigurationBuilder(this)
-                    .setReportSenderFactoryClasses(REPORT_SENDER_FACTORY_CLASSES)
                     .setBuildConfigClass(BuildConfig.class)
                     .build();
             ACRA.init(this, acraConfig);
-        } catch (ACRAConfigurationException ace) {
+        } catch (final ACRAConfigurationException ace) {
             ace.printStackTrace();
             ErrorActivity.reportError(this,
                     ace,
                     null,
                     null,
-                    ErrorActivity.ErrorInfo.make(UserAction.SOMETHING_ELSE, "none",
+                    ErrorInfo.make(UserAction.SOMETHING_ELSE, "none",
                             "Could not initialize ACRA crash report", R.string.app_ui_crash));
         }
     }
 
-    public void initNotificationChannel() {
-        if (Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.O) {
+    private void initNotificationChannels() {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {
             return;
         }
 
-        final String id = getString(R.string.notification_channel_id);
-        final CharSequence name = getString(R.string.notification_channel_name);
-        final String description = getString(R.string.notification_channel_description);
+        String id = getString(R.string.notification_channel_id);
+        String name = getString(R.string.notification_channel_name);
+        String description = getString(R.string.notification_channel_description);
 
-        // Keep this below DEFAULT to avoid making noise on every notification update
-        final int importance = NotificationManager.IMPORTANCE_LOW;
+        // Keep this below DEFAULT to avoid making noise on every notification update for the main
+        // and update channels
+        int importance = NotificationManager.IMPORTANCE_LOW;
 
-        NotificationChannel mChannel = new NotificationChannel(id, name, importance);
-        mChannel.setDescription(description);
+        final NotificationChannel mainChannel = new NotificationChannel(id, name, importance);
+        mainChannel.setDescription(description);
 
-        NotificationManager mNotificationManager =
-                (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
-        mNotificationManager.createNotificationChannel(mChannel);
+        id = getString(R.string.app_update_notification_channel_id);
+        name = getString(R.string.app_update_notification_channel_name);
+        description = getString(R.string.app_update_notification_channel_description);
 
-        setUpUpdateNotificationChannel(importance);
-    }
+        final NotificationChannel appUpdateChannel = new NotificationChannel(id, name, importance);
+        appUpdateChannel.setDescription(description);
 
-    /**
-     * Set up notification channel for app update.
-     *
-     * @param importance
-     */
-    @TargetApi(Build.VERSION_CODES.O)
-    private void setUpUpdateNotificationChannel(final int importance) {
-        final String appUpdateId
-                = getString(R.string.app_update_notification_channel_id);
-        final CharSequence appUpdateName
-                = getString(R.string.app_update_notification_channel_name);
-        final String appUpdateDescription
-                = getString(R.string.app_update_notification_channel_description);
+        id = getString(R.string.hash_channel_id);
+        name = getString(R.string.hash_channel_name);
+        description = getString(R.string.hash_channel_description);
+        importance = NotificationManager.IMPORTANCE_HIGH;
 
-        NotificationChannel appUpdateChannel
-                = new NotificationChannel(appUpdateId, appUpdateName, importance);
-        appUpdateChannel.setDescription(appUpdateDescription);
+        final NotificationChannel hashChannel = new NotificationChannel(id, name, importance);
+        hashChannel.setDescription(description);
 
-        NotificationManager appUpdateNotificationManager
-                = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
-        appUpdateNotificationManager.createNotificationChannel(appUpdateChannel);
+        final NotificationManager notificationManager = getSystemService(NotificationManager.class);
+        notificationManager.createNotificationChannels(Arrays.asList(mainChannel,
+                appUpdateChannel, hashChannel));
     }
 
     protected boolean isDisposedRxExceptionsReported() {

app/src/main/java/org/schabi/newpipe/BaseFragment.java

@@ -35,7 +35,7 @@ public abstract class BaseFragment extends Fragment {
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    public void onAttach(final Context context) {
+    public void onAttach(@NonNull final Context context) {
         super.onAttach(context);
         activity = (AppCompatActivity) context;
     }
@@ -61,7 +61,7 @@ public abstract class BaseFragment extends Fragment {
 
 
     @Override
-    public void onViewCreated(final View rootView, final Bundle savedInstanceState) {
+    public void onViewCreated(@NonNull final View rootView, final Bundle savedInstanceState) {
         super.onViewCreated(rootView, savedInstanceState);
         if (DEBUG) {
             Log.d(TAG, "onViewCreated() called with: "
@@ -73,7 +73,7 @@ public abstract class BaseFragment extends Fragment {
     }
 
     @Override
-    public void onSaveInstanceState(final Bundle outState) {
+    public void onSaveInstanceState(@NonNull final Bundle outState) {
         super.onSaveInstanceState(outState);
         Icepick.saveInstanceState(this, outState);
     }

app/src/main/java/org/schabi/newpipe/CheckForNewAppVersion.java

@@ -0,0 +1,245 @@
+package org.schabi.newpipe;
+
+import android.app.Application;
+import android.app.PendingIntent;
+import android.content.Intent;
+import android.content.SharedPreferences;
+import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager;
+import android.content.pm.Signature;
+import android.net.ConnectivityManager;
+import android.net.Uri;
+import android.util.Log;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.core.app.NotificationCompat;
+import androidx.core.app.NotificationManagerCompat;
+import androidx.core.content.ContextCompat;
+import androidx.preference.PreferenceManager;
+import com.grack.nanojson.JsonObject;
+import com.grack.nanojson.JsonParser;
+import com.grack.nanojson.JsonParserException;
+import io.reactivex.rxjava3.android.schedulers.AndroidSchedulers;
+import io.reactivex.rxjava3.core.Maybe;
+import io.reactivex.rxjava3.disposables.Disposable;
+import io.reactivex.rxjava3.schedulers.Schedulers;
+import java.io.ByteArrayInputStream;
+import java.io.InputStream;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.security.cert.CertificateEncodingException;
+import java.security.cert.CertificateException;
+import java.security.cert.CertificateFactory;
+import java.security.cert.X509Certificate;
+import org.schabi.newpipe.report.ErrorActivity;
+import org.schabi.newpipe.report.ErrorInfo;
+import org.schabi.newpipe.report.UserAction;
+
+public final class CheckForNewAppVersion {
+    private CheckForNewAppVersion() { }
+
+    private static final boolean DEBUG = MainActivity.DEBUG;
+    private static final String TAG = CheckForNewAppVersion.class.getSimpleName();
+
+    private static final String GITHUB_APK_SHA1
+            = "B0:2E:90:7C:1C:D6:FC:57:C3:35:F0:88:D0:8F:50:5F:94:E4:D2:15";
+    private static final String NEWPIPE_API_URL = "https://newpipe.net/api/data.json";
+
+    /**
+     * Method to get the APK's SHA1 key. See https://stackoverflow.com/questions/9293019/#22506133.
+     *
+     * @param application The application
+     * @return String with the APK's SHA1 fingerprint in hexadecimal
+     */
+    @NonNull
+    private static String getCertificateSHA1Fingerprint(@NonNull final Application application) {
+        final PackageInfo packageInfo;
+        try {
+            packageInfo = application.getPackageManager().getPackageInfo(
+                    application.getPackageName(), PackageManager.GET_SIGNATURES);
+        } catch (final PackageManager.NameNotFoundException e) {
+            ErrorActivity.reportError(application, e, null, null,
+                    ErrorInfo.make(UserAction.SOMETHING_ELSE, "none",
+                            "Could not find package info", R.string.app_ui_crash));
+            return "";
+        }
+
+        final X509Certificate c;
+        try {
+            final Signature[] signatures = packageInfo.signatures;
+            final byte[] cert = signatures[0].toByteArray();
+            final InputStream input = new ByteArrayInputStream(cert);
+            final CertificateFactory cf = CertificateFactory.getInstance("X509");
+            c = (X509Certificate) cf.generateCertificate(input);
+        } catch (final CertificateException e) {
+            ErrorActivity.reportError(application, e, null, null,
+                    ErrorInfo.make(UserAction.SOMETHING_ELSE, "none",
+                            "Certificate error", R.string.app_ui_crash));
+            return "";
+        }
+
+        try {
+            final MessageDigest md = MessageDigest.getInstance("SHA1");
+            final byte[] publicKey = md.digest(c.getEncoded());
+            return byte2HexFormatted(publicKey);
+        } catch (NoSuchAlgorithmException | CertificateEncodingException e) {
+            ErrorActivity.reportError(application, e, null, null,
+                    ErrorInfo.make(UserAction.SOMETHING_ELSE, "none",
+                            "Could not retrieve SHA1 key", R.string.app_ui_crash));
+            return "";
+        }
+    }
+
+    private static String byte2HexFormatted(final byte[] arr) {
+        final StringBuilder str = new StringBuilder(arr.length * 2);
+
+        for (int i = 0; i < arr.length; i++) {
+            String h = Integer.toHexString(arr[i]);
+            final int l = h.length();
+            if (l == 1) {
+                h = "0" + h;
+            }
+            if (l > 2) {
+                h = h.substring(l - 2, l);
+            }
+            str.append(h.toUpperCase());
+            if (i < (arr.length - 1)) {
+                str.append(':');
+            }
+        }
+        return str.toString();
+    }
+
+    /**
+     * Method to compare the current and latest available app version.
+     * If a newer version is available, we show the update notification.
+     *
+     * @param application    The application
+     * @param versionName    Name of new version
+     * @param apkLocationUrl Url with the new apk
+     * @param versionCode    Code of new version
+     */
+    private static void compareAppVersionAndShowNotification(@NonNull final Application application,
+                                                             final String versionName,
+                                                             final String apkLocationUrl,
+                                                             final int versionCode) {
+        final int notificationId = 2000;
+
+        if (BuildConfig.VERSION_CODE < versionCode) {
+            // A pending intent to open the apk location url in the browser.
+            final Intent viewIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(apkLocationUrl));
+
+            final Intent intent = new Intent(Intent.ACTION_CHOOSER);
+            intent.putExtra(Intent.EXTRA_INTENT, viewIntent);
+            intent.putExtra(Intent.EXTRA_TITLE, R.string.open_with);
+            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+
+            final PendingIntent pendingIntent
+                    = PendingIntent.getActivity(application, 0, intent, 0);
+
+            final String channelId = application
+                    .getString(R.string.app_update_notification_channel_id);
+            final NotificationCompat.Builder notificationBuilder
+                    = new NotificationCompat.Builder(application, channelId)
+                    .setSmallIcon(R.drawable.ic_newpipe_update)
+                    .setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
+                    .setContentIntent(pendingIntent)
+                    .setAutoCancel(true)
+                    .setContentTitle(application
+                            .getString(R.string.app_update_notification_content_title))
+                    .setContentText(application
+                            .getString(R.string.app_update_notification_content_text)
+                            + " " + versionName);
+
+            final NotificationManagerCompat notificationManager
+                    = NotificationManagerCompat.from(application);
+            notificationManager.notify(notificationId, notificationBuilder.build());
+        }
+    }
+
+    private static boolean isConnected(@NonNull final App app) {
+        final ConnectivityManager connectivityManager =
+                ContextCompat.getSystemService(app, ConnectivityManager.class);
+        return connectivityManager != null && connectivityManager.getActiveNetworkInfo() != null
+                && connectivityManager.getActiveNetworkInfo().isConnected();
+    }
+
+    public static boolean isGithubApk(@NonNull final App app) {
+        return getCertificateSHA1Fingerprint(app).equals(GITHUB_APK_SHA1);
+    }
+
+    @Nullable
+    public static Disposable checkNewVersion(@NonNull final App app) {
+        final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(app);
+        final NewVersionManager manager = new NewVersionManager();
+
+        // Check if user has enabled/disabled update checking
+        // and if the current apk is a github one or not.
+        if (!prefs.getBoolean(app.getString(R.string.update_app_key), true) || !isGithubApk(app)) {
+            return null;
+        }
+
+        // Check if the last request has happened a certain time ago
+        // to reduce the number of API requests.
+        final long expiry = prefs.getLong(app.getString(R.string.update_expiry_key), 0);
+        if (!manager.isExpired(expiry)) {
+            return null;
+        }
+
+        return Maybe
+            .fromCallable(() -> {
+                if (!isConnected(app)) {
+                    return null;
+                }
+
+                // Make a network request to get latest NewPipe data.
+                return DownloaderImpl.getInstance().get(NEWPIPE_API_URL);
+            })
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread())
+                .subscribe(
+                        response -> {
+                            try {
+                                // Store a timestamp which needs to be exceeded,
+                                // before a new request to the API is made.
+                                final long newExpiry = manager
+                                    .coerceExpiry(response.getHeader("expires"));
+                                prefs.edit()
+                                    .putLong(app.getString(R.string.update_expiry_key), newExpiry)
+                                    .apply();
+                            } catch (final Exception e) {
+                                if (DEBUG) {
+                                    Log.w(TAG, "Could not extract and save new expiry date", e);
+                                }
+                            }
+
+                            // Parse the json from the response.
+                            try {
+                                final JsonObject githubStableObject = JsonParser.object()
+                                    .from(response.responseBody()).getObject("flavors")
+                                    .getObject("github").getObject("stable");
+
+                                final String versionName = githubStableObject
+                                    .getString("version");
+                                final int versionCode = githubStableObject
+                                    .getInt("version_code");
+                                final String apkLocationUrl = githubStableObject
+                                    .getString("apk");
+
+                                compareAppVersionAndShowNotification(app, versionName,
+                                        apkLocationUrl, versionCode);
+                            } catch (final JsonParserException e) {
+                                // connectivity problems, do not alarm user and fail silently
+                                if (DEBUG) {
+                                    Log.w(TAG, "Could not get NewPipe API: invalid json", e);
+                                }
+                            }
+                        },
+                        e -> {
+                            // connectivity problems, do not alarm user and fail silently
+                            if (DEBUG) {
+                                Log.w(TAG, "Could not get NewPipe API: network problem", e);
+                            }
+                        });
+    }
+}

app/src/main/java/org/schabi/newpipe/CheckForNewAppVersionTask.java

@@ -1,221 +0,0 @@
-package org.schabi.newpipe;
-
-import android.app.Application;
-import android.app.PendingIntent;
-import android.content.Context;
-import android.content.Intent;
-import android.content.SharedPreferences;
-import android.content.pm.PackageInfo;
-import android.content.pm.PackageManager;
-import android.content.pm.Signature;
-import android.net.ConnectivityManager;
-import android.net.Uri;
-import android.os.AsyncTask;
-import android.preference.PreferenceManager;
-import android.util.Log;
-
-import androidx.core.app.NotificationCompat;
-import androidx.core.app.NotificationManagerCompat;
-
-import com.grack.nanojson.JsonObject;
-import com.grack.nanojson.JsonParser;
-import com.grack.nanojson.JsonParserException;
-
-import org.schabi.newpipe.extractor.exceptions.ReCaptchaException;
-import org.schabi.newpipe.report.ErrorActivity;
-import org.schabi.newpipe.report.UserAction;
-
-import java.io.ByteArrayInputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import java.security.MessageDigest;
-import java.security.NoSuchAlgorithmException;
-import java.security.cert.CertificateEncodingException;
-import java.security.cert.CertificateException;
-import java.security.cert.CertificateFactory;
-import java.security.cert.X509Certificate;
-
-/**
- * AsyncTask to check if there is a newer version of the NewPipe github apk available or not.
- * If there is a newer version we show a notification, informing the user. On tapping
- * the notification, the user will be directed to the download link.
- */
-public class CheckForNewAppVersionTask extends AsyncTask<Void, Void, String> {
-    private static final boolean DEBUG = MainActivity.DEBUG;
-    private static final String TAG = CheckForNewAppVersionTask.class.getSimpleName();
-
-    private static final Application APP = App.getApp();
-    private static final String GITHUB_APK_SHA1
-            = "B0:2E:90:7C:1C:D6:FC:57:C3:35:F0:88:D0:8F:50:5F:94:E4:D2:15";
-    private static final String NEWPIPE_API_URL = "https://newpipe.schabi.org/api/data.json";
-
-    /**
-     * Method to get the apk's SHA1 key. See https://stackoverflow.com/questions/9293019/#22506133.
-     *
-     * @return String with the apk's SHA1 fingeprint in hexadecimal
-     */
-    private static String getCertificateSHA1Fingerprint() {
-        final PackageManager pm = APP.getPackageManager();
-        final String packageName = APP.getPackageName();
-        final int flags = PackageManager.GET_SIGNATURES;
-        PackageInfo packageInfo = null;
-
-        try {
-            packageInfo = pm.getPackageInfo(packageName, flags);
-        } catch (PackageManager.NameNotFoundException e) {
-            ErrorActivity.reportError(APP, e, null, null,
-                    ErrorActivity.ErrorInfo.make(UserAction.SOMETHING_ELSE, "none",
-                            "Could not find package info", R.string.app_ui_crash));
-        }
-
-        final Signature[] signatures = packageInfo.signatures;
-        final byte[] cert = signatures[0].toByteArray();
-        final InputStream input = new ByteArrayInputStream(cert);
-
-        X509Certificate c = null;
-
-        try {
-            final CertificateFactory cf = CertificateFactory.getInstance("X509");
-            c = (X509Certificate) cf.generateCertificate(input);
-        } catch (CertificateException e) {
-            ErrorActivity.reportError(APP, e, null, null,
-                    ErrorActivity.ErrorInfo.make(UserAction.SOMETHING_ELSE, "none",
-                            "Certificate error", R.string.app_ui_crash));
-        }
-
-        String hexString = null;
-
-        try {
-            MessageDigest md = MessageDigest.getInstance("SHA1");
-            final byte[] publicKey = md.digest(c.getEncoded());
-            hexString = byte2HexFormatted(publicKey);
-        } catch (NoSuchAlgorithmException | CertificateEncodingException e) {
-            ErrorActivity.reportError(APP, e, null, null,
-                    ErrorActivity.ErrorInfo.make(UserAction.SOMETHING_ELSE, "none",
-                            "Could not retrieve SHA1 key", R.string.app_ui_crash));
-        }
-
-        return hexString;
-    }
-
-    private static String byte2HexFormatted(final byte[] arr) {
-        final StringBuilder str = new StringBuilder(arr.length * 2);
-
-        for (int i = 0; i < arr.length; i++) {
-            String h = Integer.toHexString(arr[i]);
-            final int l = h.length();
-            if (l == 1) {
-                h = "0" + h;
-            }
-            if (l > 2) {
-                h = h.substring(l - 2, l);
-            }
-            str.append(h.toUpperCase());
-            if (i < (arr.length - 1)) {
-                str.append(':');
-            }
-        }
-        return str.toString();
-    }
-
-    public static boolean isGithubApk() {
-        return getCertificateSHA1Fingerprint().equals(GITHUB_APK_SHA1);
-    }
-
-    @Override
-    protected void onPreExecute() {
-        final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(APP);
-
-        // Check if user has enabled/disabled update checking
-        // and if the current apk is a github one or not.
-        if (!prefs.getBoolean(APP.getString(R.string.update_app_key), true) || !isGithubApk()) {
-            this.cancel(true);
-        }
-    }
-
-    @Override
-    protected String doInBackground(final Void... voids) {
-        if (isCancelled() || !isConnected()) {
-            return null;
-        }
-
-        // Make a network request to get latest NewPipe data.
-        try {
-            return DownloaderImpl.getInstance().get(NEWPIPE_API_URL).responseBody();
-        } catch (IOException | ReCaptchaException e) {
-            // connectivity problems, do not alarm user and fail silently
-            if (DEBUG) {
-                Log.w(TAG, Log.getStackTraceString(e));
-            }
-        }
-
-        return null;
-    }
-
-    @Override
-    protected void onPostExecute(final String response) {
-        // Parse the json from the response.
-        if (response != null) {
-
-            try {
-                final JsonObject githubStableObject = JsonParser.object().from(response)
-                        .getObject("flavors").getObject("github").getObject("stable");
-
-                final String versionName = githubStableObject.getString("version");
-                final int versionCode = githubStableObject.getInt("version_code");
-                final String apkLocationUrl = githubStableObject.getString("apk");
-
-                compareAppVersionAndShowNotification(versionName, apkLocationUrl, versionCode);
-
-            } catch (JsonParserException e) {
-                // connectivity problems, do not alarm user and fail silently
-                if (DEBUG) {
-                    Log.w(TAG, Log.getStackTraceString(e));
-                }
-            }
-        }
-    }
-
-    /**
-     * Method to compare the current and latest available app version.
-     * If a newer version is available, we show the update notification.
-     *
-     * @param versionName    Name of new version
-     * @param apkLocationUrl Url with the new apk
-     * @param versionCode    Code of new version
-     */
-    private void compareAppVersionAndShowNotification(final String versionName,
-                                                      final String apkLocationUrl,
-                                                      final int versionCode) {
-        int notificationId = 2000;
-
-        if (BuildConfig.VERSION_CODE < versionCode) {
-
-            // A pending intent to open the apk location url in the browser.
-            final Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(apkLocationUrl));
-            final PendingIntent pendingIntent
-                    = PendingIntent.getActivity(APP, 0, intent, 0);
-
-            final NotificationCompat.Builder notificationBuilder = new NotificationCompat
-                    .Builder(APP, APP.getString(R.string.app_update_notification_channel_id))
-                    .setSmallIcon(R.drawable.ic_newpipe_update)
-                    .setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
-                    .setContentIntent(pendingIntent)
-                    .setAutoCancel(true)
-                    .setContentTitle(APP.getString(R.string.app_update_notification_content_title))
-                    .setContentText(APP.getString(R.string.app_update_notification_content_text)
-                            + " " + versionName);
-
-            final NotificationManagerCompat notificationManager
-                    = NotificationManagerCompat.from(APP);
-            notificationManager.notify(notificationId, notificationBuilder.build());
-        }
-    }
-
-    private boolean isConnected() {
-        final ConnectivityManager cm =
-                (ConnectivityManager) APP.getSystemService(Context.CONNECTIVITY_SERVICE);
-        return cm.getActiveNetworkInfo() != null
-                && cm.getActiveNetworkInfo().isConnected();
-    }
-}

app/src/main/java/org/schabi/newpipe/DownloaderImpl.java

@@ -2,10 +2,10 @@ package org.schabi.newpipe;
 
 import android.content.Context;
 import android.os.Build;
-import android.preference.PreferenceManager;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
+import androidx.preference.PreferenceManager;
 
 import org.schabi.newpipe.extractor.downloader.Downloader;
 import org.schabi.newpipe.extractor.downloader.Request;
@@ -50,8 +50,8 @@ public final class DownloaderImpl extends Downloader {
     public static final String YOUTUBE_DOMAIN = "youtube.com";
 
     private static DownloaderImpl instance;
-    private Map<String, String> mCookies;
-    private OkHttpClient client;
+    private final Map<String, String> mCookies;
+    private final OkHttpClient client;
 
     private DownloaderImpl(final OkHttpClient.Builder builder) {
         if (Build.VERSION.SDK_INT == Build.VERSION_CODES.KITKAT) {
@@ -94,18 +94,18 @@ public final class DownloaderImpl extends Downloader {
     private static void enableModernTLS(final OkHttpClient.Builder builder) {
         try {
             // get the default TrustManager
-            TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(
+            final TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(
                     TrustManagerFactory.getDefaultAlgorithm());
             trustManagerFactory.init((KeyStore) null);
-            TrustManager[] trustManagers = trustManagerFactory.getTrustManagers();
+            final TrustManager[] trustManagers = trustManagerFactory.getTrustManagers();
             if (trustManagers.length != 1 || !(trustManagers[0] instanceof X509TrustManager)) {
                 throw new IllegalStateException("Unexpected default trust managers:"
                         + Arrays.toString(trustManagers));
             }
-            X509TrustManager trustManager = (X509TrustManager) trustManagers[0];
+            final X509TrustManager trustManager = (X509TrustManager) trustManagers[0];
 
             // insert our own TLSSocketFactory
-            SSLSocketFactory sslSocketFactory = TLSSocketFactoryCompat.getInstance();
+            final SSLSocketFactory sslSocketFactory = TLSSocketFactoryCompat.getInstance();
 
             builder.sslSocketFactory(sslSocketFactory, trustManager);
 
@@ -114,16 +114,16 @@ public final class DownloaderImpl extends Downloader {
             // Necessary because some servers (e.g. Framatube.org)
             // don't support the old cipher suites.
             // https://github.com/square/okhttp/issues/4053#issuecomment-402579554
-            List<CipherSuite> cipherSuites = new ArrayList<>();
-            cipherSuites.addAll(ConnectionSpec.MODERN_TLS.cipherSuites());
+            final List<CipherSuite> cipherSuites =
+                    new ArrayList<>(ConnectionSpec.MODERN_TLS.cipherSuites());
             cipherSuites.add(CipherSuite.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA);
             cipherSuites.add(CipherSuite.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA);
-            ConnectionSpec legacyTLS = new ConnectionSpec.Builder(ConnectionSpec.MODERN_TLS)
+            final ConnectionSpec legacyTLS = new ConnectionSpec.Builder(ConnectionSpec.MODERN_TLS)
                     .cipherSuites(cipherSuites.toArray(new CipherSuite[0]))
                     .build();
 
             builder.connectionSpecs(Arrays.asList(legacyTLS, ConnectionSpec.CLEARTEXT));
-        } catch (KeyManagementException | NoSuchAlgorithmException | KeyStoreException e) {
+        } catch (final KeyManagementException | NoSuchAlgorithmException | KeyStoreException e) {
             if (DEBUG) {
                 e.printStackTrace();
             }
@@ -131,15 +131,15 @@ public final class DownloaderImpl extends Downloader {
     }
 
     public String getCookies(final String url) {
-        List<String> resultCookies = new ArrayList<>();
+        final List<String> resultCookies = new ArrayList<>();
         if (url.contains(YOUTUBE_DOMAIN)) {
-            String youtubeCookie = getCookie(YOUTUBE_RESTRICTED_MODE_COOKIE_KEY);
+            final String youtubeCookie = getCookie(YOUTUBE_RESTRICTED_MODE_COOKIE_KEY);
             if (youtubeCookie != null) {
                 resultCookies.add(youtubeCookie);
             }
         }
         // Recaptcha cookie is always added TODO: not sure if this is necessary
-        String recaptchaCookie = getCookie(ReCaptchaActivity.RECAPTCHA_COOKIES_KEY);
+        final String recaptchaCookie = getCookie(ReCaptchaActivity.RECAPTCHA_COOKIES_KEY);
         if (recaptchaCookie != null) {
             resultCookies.add(recaptchaCookie);
         }
@@ -159,9 +159,9 @@ public final class DownloaderImpl extends Downloader {
     }
 
     public void updateYoutubeRestrictedModeCookies(final Context context) {
-        String restrictedModeEnabledKey =
+        final String restrictedModeEnabledKey =
                 context.getString(R.string.youtube_restricted_mode_enabled);
-        boolean restrictedModeEnabled = PreferenceManager.getDefaultSharedPreferences(context)
+        final boolean restrictedModeEnabled = PreferenceManager.getDefaultSharedPreferences(context)
                 .getBoolean(restrictedModeEnabledKey, false);
         updateYoutubeRestrictedModeCookies(restrictedModeEnabled);
     }
@@ -186,9 +186,9 @@ public final class DownloaderImpl extends Downloader {
         try {
             final Response response = head(url);
             return Long.parseLong(response.getHeader("Content-Length"));
-        } catch (NumberFormatException e) {
+        } catch (final NumberFormatException e) {
             throw new IOException("Invalid content length", e);
-        } catch (ReCaptchaException e) {
+        } catch (final ReCaptchaException e) {
             throw new IOException(e);
         }
     }
@@ -199,7 +199,7 @@ public final class DownloaderImpl extends Downloader {
                     .method("GET", null).url(siteUrl)
                     .addHeader("User-Agent", USER_AGENT);
 
-            String cookies = getCookies(siteUrl);
+            final String cookies = getCookies(siteUrl);
             if (!cookies.isEmpty()) {
                 requestBuilder.addHeader("Cookie", cookies);
             }
@@ -218,7 +218,7 @@ public final class DownloaderImpl extends Downloader {
             }
 
             return body.byteStream();
-        } catch (ReCaptchaException e) {
+        } catch (final ReCaptchaException e) {
             throw new IOException(e.getMessage(), e.getCause());
         }
     }
@@ -240,18 +240,18 @@ public final class DownloaderImpl extends Downloader {
                 .method(httpMethod, requestBody).url(url)
                 .addHeader("User-Agent", USER_AGENT);
 
-        String cookies = getCookies(url);
+        final String cookies = getCookies(url);
         if (!cookies.isEmpty()) {
             requestBuilder.addHeader("Cookie", cookies);
         }
 
-        for (Map.Entry<String, List<String>> pair : headers.entrySet()) {
+        for (final Map.Entry<String, List<String>> pair : headers.entrySet()) {
             final String headerName = pair.getKey();
             final List<String> headerValueList = pair.getValue();
 
             if (headerValueList.size() > 1) {
                 requestBuilder.removeHeader(headerName);
-                for (String headerValue : headerValueList) {
+                for (final String headerValue : headerValueList) {
                     requestBuilder.addHeader(headerName, headerValue);
                 }
             } else if (headerValueList.size() == 1) {

app/src/main/java/org/schabi/newpipe/ExitActivity.java

@@ -27,7 +27,7 @@ import android.os.Bundle;
 public class ExitActivity extends Activity {
 
     public static void exitAndRemoveFromRecentApps(final Activity activity) {
-        Intent intent = new Intent(activity, ExitActivity.class);
+        final Intent intent = new Intent(activity, ExitActivity.class);
 
         intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK
                 | Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS
@@ -42,7 +42,7 @@ public class ExitActivity extends Activity {
     protected void onCreate(final Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
-        if (Build.VERSION.SDK_INT >= 21) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
             finishAndRemoveTask();
         } else {
             finish();

app/src/main/java/org/schabi/newpipe/ImageDownloader.java

@@ -4,7 +4,8 @@ import android.annotation.SuppressLint;
 import android.content.Context;
 import android.content.SharedPreferences;
 import android.content.res.Resources;
-import android.preference.PreferenceManager;
+
+import androidx.preference.PreferenceManager;
 
 import com.nostra13.universalimageloader.core.download.BaseImageDownloader;