Android templates: update default Kotlin from 1.8.22 to 2.1.0, update default Gradle from 8.9 to 8.12 (#160974)

dev/devicelab/bin/tasks/android_java17_dependency_smoke_tests.dart

@@ -15,8 +15,8 @@ import 'package:flutter_devicelab/framework/framework.dart';
 //           https://developer.android.com/build/releases/past-releases/agp-8-4-0-release-notes.
 // - Kotlin: No methodology as of yet.
 // (*) - support range defined in packages/flutter_tools/gradle/src/main/kotlin/dependency_version_checker.gradle.kts.
-// Note that compileSdk 35 requires AGP 8.1.0+, so override to compileSdk 34 for AGP 8.0.
 List<VersionTuple> versionTuples = <VersionTuple>[
+  // compileSdk 35 requires AGP 8.1.0+, so override to compileSdk 34 for AGP 8.0.
   VersionTuple(
     agpVersion: '8.0.0',
     gradleVersion: '8.0',
@@ -30,6 +30,8 @@ List<VersionTuple> versionTuples = <VersionTuple>[
   VersionTuple(agpVersion: '8.5.0', gradleVersion: '8.7', kotlinVersion: '1.8.22'),
   VersionTuple(agpVersion: '8.6.0', gradleVersion: '8.7', kotlinVersion: '1.8.22'),
   VersionTuple(agpVersion: '8.7.0', gradleVersion: '8.9', kotlinVersion: '1.8.22'),
+  VersionTuple(agpVersion: '8.7.0', gradleVersion: '8.9', kotlinVersion: '2.1.0'),
+  VersionTuple(agpVersion: '8.7.0', gradleVersion: '8.12', kotlinVersion: '2.1.0'),
 ];
 
 Future<void> main() async {

dev/integration_tests/deferred_components_test/android/build.gradle

@@ -7,7 +7,7 @@
 // See dev/tools/bin/generate_gradle_lockfiles.dart.
 
 buildscript {
-    ext.kotlin_version = '1.8.22'
+    ext.kotlin_version = '2.1.0'
     repositories {
         google()
         mavenCentral()

packages/flutter_tools/lib/src/android/gradle_utils.dart

@@ -22,14 +22,21 @@ import 'android_sdk.dart';
 
 // These are the versions used in the project templates.
 //
-// In general, Flutter aims to default to the latest version.
-// However, this currently requires to migrate existing integration tests to the latest supported values.
+// In general, Flutter aims to default to the latest stable version.
+// However, this currently requires to migrate existing integration tests to the
+// latest supported values.
 //
 // Please see the README before changing any of these values.
-const String templateDefaultGradleVersion = '8.10.2';
-const String templateAndroidGradlePluginVersion = '8.7.0';
-const String templateAndroidGradlePluginVersionForModule = '8.7.0';
-const String templateKotlinGradlePluginVersion = '1.8.22';
+
+// See https://gradle.org/releases
+const String templateDefaultGradleVersion = '8.12';
+
+// See https://mvnrepository.com/artifact/com.android.tools.build/gradle
+const String templateAndroidGradlePluginVersion = '8.7.3';
+const String templateAndroidGradlePluginVersionForModule = '8.7.3';
+
+// See https://kotlinlang.org/docs/releases.html#release-details
+const String templateKotlinGradlePluginVersion = '2.1.0';
 
 // The Flutter Gradle Plugin is only applied to app projects, and modules that
 // are built from source using (`include_flutter.groovy`). The remaining
@@ -53,17 +60,17 @@ const String oneMajorVersionHigherJavaVersion = '24';
 //
 // Supported here means supported by the tooling for
 // flutter analyze --suggestions and does not imply broader flutter support.
-const String maxKnownAndSupportedGradleVersion = '8.10.2';
+const String maxKnownAndSupportedGradleVersion = '8.12';
 
 // Update this when new versions of AGP come out.
 //
 // Supported here means tooling is aware of this version's Java <-> AGP
 // compatibility.
 @visibleForTesting
-const String maxKnownAndSupportedAgpVersion = '8.7.1';
+const String maxKnownAndSupportedAgpVersion = '8.7.3';
 
 // Update this when new versions of AGP come out.
-const String maxKnownAgpVersion = '8.7.1';
+const String maxKnownAgpVersion = '8.7.3';
 
 // Oldest documented version of AGP that has a listed minimum
 // compatible Java version.
@@ -481,7 +488,7 @@ bool validateGradleAndAgp(Logger logger, {required String? gradleV, required Str
     return isWithinVersionRange(gradleV, min: '4.10.1', max: maxKnownAndSupportedGradleVersion);
   }
 
-  logger.printTrace('Unknown Gradle-Agp compatibility, $gradleV, $agpV');
+  logger.printTrace('Unknown Gradle-AGP compatibility, Gradle: $gradleV, AGP: $agpV');
   return false;
 }
 
@@ -545,7 +552,7 @@ bool validateJavaAndGradle(Logger logger, {required String? javaV, required Stri
     }
   }
 
-  logger.printTrace('Unknown Java-Gradle compatibility $javaV, $gradleV');
+  logger.printTrace('Unknown Java-Gradle compatibility, Java: $javaV, Gradle: $gradleV');
   return false;
 }
 

packages/flutter_tools/lib/src/base/version_range.dart

@@ -22,4 +22,9 @@ class VersionRange {
 
   @override
   int get hashCode => Object.hash(versionMin, versionMax);
+
+  @override
+  String toString() {
+    return 'VersionRange(versionMin: $versionMin, versionMax: $versionMax)';
+  }
 }

packages/flutter_tools/test/general.shard/android/gradle_errors_test.dart

@@ -1002,7 +1002,7 @@ A problem occurred evaluating project ':app'.
             "│     + classpath 'com.android.tools.build:gradle:$templateAndroidGradlePluginVersion'                           │\n"
             '│ /android/gradle/wrapper/gradle-wrapper.properties:                               │\n'
             '│     - https://services.gradle.org/distributions/gradle-<current-version>-all.zip │\n'
-            '│     + https://services.gradle.org/distributions/gradle-$templateDefaultGradleVersion-all.zip            │\n'
+            '│     + https://services.gradle.org/distributions/gradle-$templateDefaultGradleVersion-all.zip              │\n'
             '└──────────────────────────────────────────────────────────────────────────────────┘\n',
           ),
         );

packages/flutter_tools/test/general.shard/android/gradle_utils_test.dart

@@ -1314,13 +1314,13 @@ allprojects {
       );
       // Strictly too new Gradle and AGP versions.
       expect(
-        getJavaVersionFor(gradleV: '8.11', agpV: '8.8'),
+        getJavaVersionFor(gradleV: '8.13', agpV: '8.9'),
         equals(const VersionRange(null, null)),
       );
       // Strictly too new Gradle version and maximum version of AGP.
       //*This test case will need its expected Java range updated when a new version of AGP is supported.*
       expect(
-        getJavaVersionFor(gradleV: '8.11', agpV: maxKnownAndSupportedAgpVersion),
+        getJavaVersionFor(gradleV: '8.13', agpV: maxKnownAndSupportedAgpVersion),
         equals(const VersionRange('17', null)),
       );
       // Strictly too new AGP version and maximum version of Gradle.

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

@@ -16,7 +16,7 @@ class PluginDeferredComponentsConfig extends BasicDeferredComponentsConfig {
   @override
   String get androidBuild => r'''
 buildscript {
-    ext.kotlin_version = '1.8.22'
+    ext.kotlin_version = '2.1.0'
     repositories {
         google()
         mavenCentral()