Bump targetSdkVersion to 31 and organize static values (#91719)

.gitignore

@@ -61,7 +61,7 @@ unlinked_spec.ds
 
 # Android related
 **/android/**/gradle-wrapper.jar
-**/android/.gradle
+.gradle/
 **/android/captures/
 **/android/gradlew
 **/android/gradlew.bat

dev/benchmarks/complex_layout/android/app/build.gradle

@@ -19,7 +19,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_11
@@ -27,8 +27,8 @@ android {
     }
 
     defaultConfig {
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode 1
         versionName "0.0.1"
     }

dev/benchmarks/macrobenchmarks/android/app/build.gradle

@@ -29,7 +29,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -38,8 +38,8 @@ android {
 
     defaultConfig {
         applicationId "com.example.macrobenchmarks"
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"

dev/benchmarks/microbenchmarks/android/app/build.gradle

@@ -19,7 +19,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -27,8 +27,8 @@ android {
     }
 
     defaultConfig {
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode 1
         versionName "0.0.1"
     }

dev/benchmarks/platform_views_layout/android/app/build.gradle

@@ -19,7 +19,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -27,8 +27,8 @@ android {
     }
 
     defaultConfig {
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode 1
         versionName "0.0.1"
     }

dev/benchmarks/platform_views_layout_hybrid_composition/android/app/build.gradle

@@ -19,7 +19,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -27,8 +27,8 @@ android {
     }
 
     defaultConfig {
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode 1
         versionName "0.0.1"
     }

dev/benchmarks/test_apps/stocks/android/app/build.gradle

@@ -29,7 +29,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -38,8 +38,8 @@ android {
 
     defaultConfig {
         applicationId "io.flutter.examples.stocks"
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
     }

dev/integration_tests/abstract_method_smoke_test/android/app/build.gradle

@@ -30,7 +30,7 @@ apply plugin: 'kotlin-android'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -49,7 +49,7 @@ android {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "com.example.abstract_method_smoke_test"
         minSdkVersion 21
-        targetSdkVersion 30
+        targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
     }

dev/integration_tests/android_embedding_v2_smoke_test/android/app/build.gradle

@@ -30,7 +30,7 @@ apply plugin: 'kotlin-android'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -49,7 +49,7 @@ android {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "com.example.android_embedding_v2_smoke_test"
         minSdkVersion 21
-        targetSdkVersion 30
+        targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
     }

dev/integration_tests/android_semantics_testing/android/app/build.gradle

@@ -19,7 +19,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -27,8 +27,8 @@ android {
     }
 
     defaultConfig {
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode 1
         versionName "0.0.1"
     }

dev/integration_tests/android_views/android/app/build.gradle

@@ -29,7 +29,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -39,8 +39,8 @@ android {
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "io.flutter.integration.platformviews"
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
     }

dev/integration_tests/android_views/android/app/src/main/AndroidManifest.xml

@@ -5,13 +5,14 @@ found in the LICENSE file. -->
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="io.flutter.integration.platformviews">
 
-    <uses-permission android:name="android.permission.INTERNET"/>
+    <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
 
     <application
         android:name="io.flutter.app.FlutterApplication"
         android:label="platform_views">
         <activity
+            android:exported="true"
             android:name=".MainActivity"
             android:launchMode="singleTop"
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density"
@@ -21,8 +22,8 @@ found in the LICENSE file. -->
                 android:name="io.flutter.app.android.SplashScreenUntilFirstFrame"
                 android:value="true" />
             <intent-filter>
-                <action android:name="android.intent.action.MAIN"/>
-                <category android:name="android.intent.category.LAUNCHER"/>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
     <!-- Don't delete the meta-data below.

dev/integration_tests/channels/android/app/build.gradle

@@ -19,7 +19,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -27,8 +27,8 @@ android {
     }
 
     defaultConfig {
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode 1
         versionName "0.0.1"
     }

dev/integration_tests/deferred_components_test/android/app/build.gradle

@@ -36,7 +36,7 @@ apply plugin: 'kotlin-android'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     sourceSets {
         main.java.srcDirs += 'src/main/kotlin'
@@ -49,8 +49,8 @@ android {
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "io.flutter.integration.deferred_components_test"
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
     }

dev/integration_tests/external_ui/android/app/build.gradle

@@ -19,7 +19,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -28,8 +28,8 @@ android {
 
     defaultConfig {
         applicationId "io.flutter.externalui"
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode 1
         versionName "1.0"
     }

dev/integration_tests/flavors/android/app/build.gradle

@@ -19,7 +19,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -28,8 +28,8 @@ android {
 
     defaultConfig {
         applicationId "com.yourcompany.flavors"
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode 1
         versionName "1.0"
     }

dev/integration_tests/flutter_gallery/android/app/build.gradle

@@ -40,7 +40,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -49,8 +49,8 @@ android {
 
     defaultConfig {
         applicationId "io.flutter.demo.gallery"
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"

dev/integration_tests/gradle_deprecated_settings/android/app/build.gradle

@@ -19,7 +19,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -29,7 +29,7 @@ android {
     defaultConfig {
         applicationId "com.yourcompany.flavors"
         minSdkVersion 21
-        targetSdkVersion 30
+        targetSdkVersion flutter.targetSdkVersion
         versionCode 1
         versionName "1.0"
     }

dev/integration_tests/hybrid_android_views/android/app/build.gradle

@@ -29,7 +29,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -39,8 +39,8 @@ android {
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "io.flutter.integration.platformviews"
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
     }

dev/integration_tests/non_nullable/android/app/build.gradle

@@ -30,7 +30,7 @@ apply plugin: 'kotlin-android'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -48,8 +48,8 @@ android {
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "com.example.non_nullable"
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
     }

dev/integration_tests/platform_interaction/android/app/build.gradle

@@ -19,7 +19,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -27,8 +27,8 @@ android {
     }
 
     defaultConfig {
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode 1
         versionName "0.0.1"
     }

dev/integration_tests/release_smoke_test/android/app/build.gradle

@@ -29,7 +29,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -39,8 +39,8 @@ android {
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "com.example.release_smoke_test"
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"

dev/integration_tests/ui/android/app/build.gradle

@@ -19,7 +19,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -27,8 +27,8 @@ android {
     }
 
     defaultConfig {
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode 1
         versionName "1.0"
     }

dev/manual_tests/android/app/build.gradle

@@ -30,7 +30,7 @@ apply plugin: 'kotlin-android'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -52,8 +52,8 @@ android {
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "com.example.manual_tests"
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
     }

examples/api/android/app/build.gradle

@@ -30,7 +30,7 @@ apply plugin: 'kotlin-android'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -48,8 +48,8 @@ android {
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "dev.flutter.flutter_api_samples"
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
     }

examples/flutter_view/android/app/build.gradle

@@ -29,7 +29,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -38,8 +38,8 @@ android {
 
     defaultConfig {
         applicationId "io.flutter.examples.flutter_view"
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
     }

examples/hello_world/android/app/build.gradle

@@ -29,7 +29,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -38,8 +38,8 @@ android {
 
     defaultConfig {
         applicationId "io.flutter.examples.hello_world"
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
     }

examples/image_list/android/app/build.gradle

@@ -29,7 +29,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -39,8 +39,8 @@ android {
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "com.example.image_list"
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
     }

examples/layers/android/app/build.gradle

@@ -29,7 +29,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -38,8 +38,8 @@ android {
 
     defaultConfig {
         applicationId "io.flutter.examples.layers"
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
     }

examples/platform_channel/android/app/build.gradle

@@ -29,7 +29,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -38,8 +38,8 @@ android {
 
     defaultConfig {
         applicationId "io.flutter.examples.platform_channel"
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"

examples/platform_view/android/app/build.gradle

@@ -29,7 +29,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -38,8 +38,8 @@ android {
 
     defaultConfig {
         applicationId "io.flutter.examples.platform_view"
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
     }

packages/flutter_tools/gradle/flutter.gradle

+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
 import static groovy.io.FileType.FILES
 
 import com.android.builder.model.AndroidProject
@@ -23,6 +27,27 @@ import org.gradle.api.tasks.bundling.Jar
 import org.gradle.internal.os.OperatingSystem
 import org.gradle.util.VersionNumber
 
+/** For apps only. Provides the flutter extension used in app/build.gradle. */
+class FlutterExtension {
+    /** Sets the compileSdkVersion used by default in Flutter app projects. */
+    static int compileSdkVersion = 30
+
+    /** Sets the minSdkVersion used by default in Flutter app projects. */
+    static int minSdkVersion = 16
+
+    /** Sets the targetSdkVersion used by default in Flutter app projects. */
+    static int targetSdkVersion = 31
+
+    /**
+     * Specifies the relative directory to the Flutter project directory.
+     * In an app project, this is ../.. since the app's build.gradle is under android/app.
+     */
+    String source
+
+    /** Allows to override the target file. Otherwise, the target is lib/main.dart. */
+    String target
+}
+
 buildscript {
     repositories {
         google()
@@ -33,10 +58,15 @@ buildscript {
     }
 }
 
+/**
+ * Some apps don't set default compile options.
+ * Apps can change these values in android/app/build.gradle.
+ * This just ensures that default values are set.
+ */
 android {
     compileOptions {
-        sourceCompatibility 1.8
-        targetCompatibility 1.8
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
     }
 }
 
@@ -45,19 +75,19 @@ apply plugin: FlutterPlugin
 class FlutterPlugin implements Plugin<Project> {
     private static final String DEFAULT_MAVEN_HOST = "https://storage.googleapis.com";
 
-    // The platforms that can be passed to the `--Ptarget-platform` flag.
+    /** The platforms that can be passed to the `--Ptarget-platform` flag. */
     private static final String PLATFORM_ARM32  = "android-arm";
     private static final String PLATFORM_ARM64  = "android-arm64";
     private static final String PLATFORM_X86    = "android-x86";
     private static final String PLATFORM_X86_64 = "android-x64";
 
-    // The ABI architectures.
+    /** The ABI architectures supported by Flutter. */
     private static final String ARCH_ARM32      = "armeabi-v7a";
     private static final String ARCH_ARM64      = "arm64-v8a";
     private static final String ARCH_X86        = "x86";
     private static final String ARCH_X86_64     = "x86_64";
 
-    // Maps platforms to ABI architectures.
+    /** Maps platforms to ABI architectures. */
     private static final Map PLATFORM_ARCH_MAP = [
         (PLATFORM_ARM32)    : ARCH_ARM32,
         (PLATFORM_ARM64)    : ARCH_ARM64,
@@ -65,9 +95,11 @@ class FlutterPlugin implements Plugin<Project> {
         (PLATFORM_X86_64)   : ARCH_X86_64,
     ]
 
-    // The version code that gives each ABI a value.
-    // For each APK variant, use the following versions to override the version of the Universal APK.
-    // Otherwise, the Play Store will complain that the APK variants have the same version.
+    /**
+     * The version code that gives each ABI a value.
+     * For each APK variant, use the following versions to override the version of the Universal APK.
+     * Otherwise, the Play Store will complain that the APK variants have the same version.
+     */
     private static final Map ABI_VERSION = [
         (ARCH_ARM32)        : 1,
         (ARCH_ARM64)        : 2,
@@ -75,18 +107,20 @@ class FlutterPlugin implements Plugin<Project> {
         (ARCH_X86_64)       : 4,
     ]
 
-    // When split is enabled, multiple APKs are generated per each ABI.
+    /** When split is enabled, multiple APKs are generated per each ABI. */
     private static final List DEFAULT_PLATFORMS = [
         PLATFORM_ARM32,
         PLATFORM_ARM64,
         PLATFORM_X86_64,
     ]
 
-    // The name prefix for flutter builds.  This is used to identify gradle tasks
-    // where we expect the flutter tool to provide any error output, and skip the
-    // standard Gradle error output in the FlutterEventLogger. If you change this,
-    // be sure to change any instances of this string in symbols in the code below
-    // to match.
+    /**
+     * The name prefix for flutter builds. This is used to identify gradle tasks
+     * where we expect the flutter tool to provide any error output, and skip the
+     * standard Gradle error output in the FlutterEventLogger. If you change this,
+     * be sure to change any instances of this string in symbols in the code below
+     * to match.
+     */
     static final String FLUTTER_BUILD_PREFIX = "flutterBuild"
 
     private Project project
@@ -293,7 +327,7 @@ class FlutterPlugin implements Plugin<Project> {
         getPluginDependencies().each this.&configurePluginDependencies
     }
 
-    // Adds the plugin project dependency to the app project .
+    /** Adds the plugin project dependency to the app project. */
     private void configurePluginProject(String pluginName, String _) {
         Project pluginProject = project.rootProject.findProject(":$pluginName")
         if (pluginProject == null) {
@@ -337,19 +371,19 @@ class FlutterPlugin implements Plugin<Project> {
         }
     }
 
-    // Returns `true` if the given path contains an `android/build.gradle` file.
-    //
-    // TODO(egarciad): Fix https://github.com/flutter/flutter/issues/39657.
-    // Android Studio may create empty android directories due to the logic in <app>/android/settings.gradle,
-    // which imports all plugins regardless of whether they support the android platform.
+    /**
+     * Returns `true` if the given path contains an `android/build.gradle` file.
+     */
     private Boolean doesSupportAndroidPlatform(String path) {
         File editableAndroidProject = new File(path, 'android' + File.separator + 'build.gradle')
         return editableAndroidProject.exists()
     }
 
-    // Add the dependencies on other plugin projects to the plugin project.
-    // A plugin A can depend on plugin B. As a result, this dependency must be surfaced by
-    // making the Gradle plugin project A depend on the Gradle plugin project B.
+    /**
+     * Add the dependencies on other plugin projects to the plugin project.
+     * A plugin A can depend on plugin B. As a result, this dependency must be surfaced by
+     * making the Gradle plugin project A depend on the Gradle plugin project B.
+     */
     private void configurePluginDependencies(Object dependencyObject) {
         assert dependencyObject.name instanceof String
         Project pluginProject = project.rootProject.findProject(":${dependencyObject.name}")
@@ -392,7 +426,7 @@ class FlutterPlugin implements Plugin<Project> {
         return androidPlugins
     }
 
-    // Gets the plugins dependencies from `.flutter-plugins-dependencies`.
+    /** Gets the plugins dependencies from `.flutter-plugins-dependencies`. */
     private List getPluginDependencies() {
         // Consider a `.flutter-plugins-dependencies` file with the following content:
         // {
@@ -487,7 +521,7 @@ class FlutterPlugin implements Plugin<Project> {
         return false
     }
 
-    /// Whether to build the debug app in "fast-start" mode.
+    /** Whether to build the debug app in "fast-start" mode. */
     private Boolean isFastStart() {
         if (project.hasProperty("fast-start")) {
             return project.property("fast-start").toBoolean()
@@ -501,9 +535,11 @@ class FlutterPlugin implements Plugin<Project> {
         return project.plugins.hasPlugin("com.android.application");
     }
 
-    // Returns true if the build mode is supported by the current call to Gradle.
-    // This only relevant when using a local engine. Because the engine
-    // is built for a specific mode, the call to Gradle must match that mode.
+    /**
+     * Returns true if the build mode is supported by the current call to Gradle.
+     * This only relevant when using a local engine. Because the engine
+     * is built for a specific mode, the call to Gradle must match that mode.
+     */
     private Boolean supportsBuildMode(String flutterBuildMode) {
         if (!useLocalEngine()) {
             return true;
@@ -588,30 +624,32 @@ class FlutterPlugin implements Plugin<Project> {
         return target
     }
 
-    // In AGP 4.0, the Android linter task depends on the JAR tasks that generate `libapp.so`.
-    // When building APKs, this causes an issue where building release requires the debug JAR,
-    // but Gradle won't build debug.
-    //
-    // To workaround this issue, only configure the JAR task that is required given the task
-    // from the command line.
-    //
-    // The AGP team said that this issue is fixed in Gradle 7.0, which isn't released at the
-    // time of adding this code. Once released, this can be removed.
-    //
-    // Tested cases:
-    // * `./gradlew assembleRelease`
-    // * `./gradlew app:assembleRelease.`
-    // * `./gradlew assemble{flavorName}Release`
-    // * `./gradlew app:assemble{flavorName}Release`
-    // * `./gradlew assemble.`
-    // * `./gradlew app:assemble.`
-    // * `./gradlew bundle.`
-    // * `./gradlew bundleRelease.`
-    // * `./gradlew app:bundleRelease.`
-    //
-    // Related issues:
-    // https://issuetracker.google.com/issues/158060799
-    // https://issuetracker.google.com/issues/158753935
+    /**
+     * In AGP 4.0, the Android linter task depends on the JAR tasks that generate `libapp.so`.
+     * When building APKs, this causes an issue where building release requires the debug JAR,
+     * but Gradle won't build debug.
+     *
+     * To workaround this issue, only configure the JAR task that is required given the task
+     * from the command line.
+     *
+     * The AGP team said that this issue is fixed in Gradle 7.0, which isn't released at the
+     * time of adding this code. Once released, this can be removed.
+     *
+     * Tested cases:
+     * * `./gradlew assembleRelease`
+     * * `./gradlew app:assembleRelease.`
+     * * `./gradlew assemble{flavorName}Release`
+     * * `./gradlew app:assemble{flavorName}Release`
+     * * `./gradlew assemble.`
+     * * `./gradlew app:assemble.`
+     * * `./gradlew bundle.`
+     * * `./gradlew bundleRelease.`
+     * * `./gradlew app:bundleRelease.`
+     *
+     * Related issues:
+     * https://issuetracker.google.com/issues/158060799
+     * https://issuetracker.google.com/issues/158753935
+     */
     private boolean shouldConfigureFlutterTask(Task assembleTask) {
         def cliTasksNames = project.gradle.startParameter.taskNames
         if (cliTasksNames.size() != 1 || !cliTasksNames.first().contains("assemble")) {
@@ -917,11 +955,6 @@ class FlutterPlugin implements Plugin<Project> {
     }
 }
 
-class FlutterExtension {
-    String source
-    String target
-}
-
 abstract class BaseFlutterTask extends DefaultTask {
     @Internal
     File flutterRoot

packages/flutter_tools/templates/app_shared/android-java.tmpl/app/build.gradle.tmpl

@@ -25,7 +25,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -35,8 +35,8 @@ android {
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "{{androidIdentifier}}"
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
     }

packages/flutter_tools/templates/app_shared/android-kotlin.tmpl/app/build.gradle.tmpl

@@ -26,7 +26,7 @@ apply plugin: 'kotlin-android'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -44,8 +44,8 @@ android {
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "{{androidIdentifier}}"
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
     }

packages/flutter_tools/templates/module/android/library_new_embedding/Flutter.tmpl/build.gradle.tmpl

@@ -30,7 +30,7 @@ group '{{androidIdentifier}}'
 version '1.0'
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -38,8 +38,8 @@ android {
     }
 
     defaultConfig {
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
     }

packages/flutter_tools/test/commands.shard/permeable/create_test.dart

@@ -2368,7 +2368,7 @@ void main() {
     expect(env['flutter'].allows(Version(2, 4, 9)), false);
   });
 
-  testUsingContext('default app uses Android SDK 30', () async {
+  testUsingContext('default app uses flutter default versions', () async {
     Cache.flutterRoot = '../..';
 
     final CreateCommand command = CreateCommand();
@@ -2380,8 +2380,8 @@ void main() {
 
     final String buildContent = await globals.fs.file('${projectDir.path}/android/app/build.gradle').readAsString();
 
-    expect(buildContent.contains('compileSdkVersion 30'), true);
-    expect(buildContent.contains('targetSdkVersion 30'), true);
+    expect(buildContent.contains('compileSdkVersion flutter.compileSdkVersion'), true);
+    expect(buildContent.contains('targetSdkVersion flutter.targetSdkVersion'), true);
   });
 
   testUsingContext('Linux plugins handle partially camel-case project names correctly', () async {

packages/flutter_tools/test/integration.shard/deferred_components_test.dart

@@ -40,6 +40,7 @@ void main() {
       '--target-platform=android-arm64'
     ], workingDirectory: tempDir.path);
 
+    expect(result.exitCode, 0);
     expect(result.stdout.toString(), contains('app-release.aab'));
     expect(result.stdout.toString(), contains('Deferred components prebuild validation passed.'));
     expect(result.stdout.toString(), contains('Deferred components gen_snapshot validation passed.'));
@@ -60,8 +61,6 @@ void main() {
 
     expect(archive.findFile('component1/assets/flutter_assets/test_assets/asset2.txt') != null, true);
     expect(archive.findFile('base/assets/flutter_assets/test_assets/asset1.txt') != null, true);
-
-    expect(result.exitCode, 0);
   });
 
   testWithoutContext('simple build appbundle all targets succeeds', () async {

packages/flutter_tools/test/integration.shard/test_data/deferred_components_project.dart

@@ -177,7 +177,7 @@ class BasicDeferredComponentsConfig extends DeferredComponentsConfig {
   apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
   android {
-      compileSdkVersion 30
+      compileSdkVersion flutter.compileSdkVersion
 
       sourceSets {
           main.java.srcDirs += 'src/main/kotlin'
@@ -190,8 +190,8 @@ class BasicDeferredComponentsConfig extends DeferredComponentsConfig {
       defaultConfig {
           // Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
           applicationId "ninja.qian.splitaottest1"
-          minSdkVersion 16
-          targetSdkVersion 30
+          minSdkVersion flutter.minSdkVersion
+          targetSdkVersion flutter.targetSdkVersion
           versionCode flutterVersionCode.toInteger()
           versionName flutterVersionName
       }

packages/integration_test/example/android/app/build.gradle

@@ -29,7 +29,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -39,8 +39,8 @@ android {
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "com.example.integration_test_example"
-        minSdkVersion 16
-        targetSdkVersion 30
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"