Allow plugins to use compileSdkPreview (#131901)

Fixes https://github.com/flutter/flutter/issues/124748

Based (heavily) off https://github.com/flutter/flutter/pull/104662

.ci.yaml

@@ -1076,6 +1076,36 @@ targets:
       - bin/**
       - .ci.yaml
 
+  - name: Linux android_preview_tool_integration_tests
+    bringup: true
+    recipe: flutter/flutter_drone
+    timeout: 60
+    properties:
+      add_recipes_cq: "true"
+      # This makes use of UpsideDownCake, a preview version of android. Preview versions eventually
+      # get removed from the sdk manager, so it is hosted on CIPD to ensure integration testing
+      # doesn't flake when that happens.
+      # https://chrome-infra-packages.appspot.com/p/flutter/android/sdk/all/linux-amd64/+/version:udcv1
+      dependencies: >-
+        [
+          {"dependency": "android_sdk", "version": "version:udcv1"},
+          {"dependency": "chrome_and_driver", "version": "version:119.0.6045.9"},
+          {"dependency": "clang", "version": "git_revision:5d5aba78dbbee75508f01bcaa69aedb2ab79065a"},
+          {"dependency": "cmake", "version": "build_id:8787856497187628321"},
+          {"dependency": "goldctl", "version": "git_revision:720a542f6fe4f92922c3b8f0fdcc4d2ac6bb83cd"},
+          {"dependency": "ninja", "version": "version:1.9.0"},
+          {"dependency": "open_jdk", "version": "version:11"}
+        ]
+      shard: android_preview_tool_integration_tests
+      tags: >
+        ["framework", "hostonly", "shard", "linux"]
+      test_timeout_secs: "2700"
+    runIf:
+      - dev/**
+      - packages/flutter_tools/**
+      - bin/**
+      - .ci.yaml
+
   - name: Linux tool_tests_commands
     recipe: flutter/flutter_drone
     timeout: 60

dev/bots/test.dart

@@ -253,6 +253,7 @@ Future<void> main(List<String> args) async {
       // web_tool_tests is also used by HHH: https://dart.googlesource.com/recipes/+/refs/heads/master/recipes/dart/flutter_engine.py
       'web_tool_tests': _runWebToolTests,
       'tool_integration_tests': _runIntegrationToolTests,
+      'android_preview_tool_integration_tests': _runAndroidPreviewIntegrationToolTests,
       'tool_host_cross_arch_tests': _runToolHostCrossArchTests,
       // All the unit/widget tests run using `flutter test --platform=chrome --web-renderer=html`
       'web_tests': _runWebHtmlUnitTests,
@@ -477,6 +478,20 @@ Future<void> _runIntegrationToolTests() async {
   );
 }
 
+Future<void> _runAndroidPreviewIntegrationToolTests() async {
+  final List<String> allTests = Directory(path.join(_toolsPath, 'test', 'android_preview_integration.shard'))
+      .listSync(recursive: true).whereType<File>()
+      .map<String>((FileSystemEntity entry) => path.relative(entry.path, from: _toolsPath))
+      .toList();
+
+  await _runDartTest(
+    _toolsPath,
+    forceSingleCore: true,
+    testPaths: _selectIndexOfTotalSubshard<String>(allTests),
+    collectMetrics: true,
+  );
+}
+
 Future<void> _runToolTests() async {
   await selectSubshard(<String, ShardRunner>{
     'general': _runGeneralToolTests,

packages/flutter_tools/gradle/src/main/groovy/flutter.groovy

@@ -441,7 +441,7 @@ class FlutterPlugin implements Plugin<Project> {
         pluginProject.afterEvaluate {
             // Checks if there is a mismatch between the plugin compileSdkVersion and the project compileSdkVersion.
             if (pluginProject.android.compileSdkVersion > project.android.compileSdkVersion) {
-                project.logger.quiet("Warning: The plugin ${pluginName} requires Android SDK version ${pluginProject.android.compileSdkVersion.substring(8)}.")
+                project.logger.quiet("Warning: The plugin ${pluginName} requires Android SDK version ${getCompileSdkFromProject(pluginProject)}.")
                 project.logger.quiet("For more information about build configuration, see $kWebsiteDeploymentAndroidBuildConfig.")
             }
 
@@ -483,9 +483,11 @@ class FlutterPlugin implements Plugin<Project> {
     /** Prints error message and fix for any plugin compileSdkVersion or ndkVersion that are higher than the project. */
     private void detectLowCompileSdkVersionOrNdkVersion() {
         project.afterEvaluate {
-            int projectCompileSdkVersion = Integer.MAX_VALUE // Default to int max if using a preview version to skip the sdk check.
-            if (project.android.compileSdkVersion.substring(8).isInteger()) { // Stable versions use ints, legacy preview uses string.
-                projectCompileSdkVersion = project.android.compileSdkVersion.substring(8) as int
+            // Default to int max if using a preview version to skip the sdk check.
+            int projectCompileSdkVersion = Integer.MAX_VALUE
+            // Stable versions use ints, legacy preview uses string.
+            if (getCompileSdkFromProject(project).isInteger()) {
+                projectCompileSdkVersion = getCompileSdkFromProject(project) as int
             }
             int maxPluginCompileSdkVersion = projectCompileSdkVersion
             String ndkVersionIfUnspecified = "21.1.6352462" /* The default for AGP 4.1.0 used in old templates. */
@@ -496,7 +498,12 @@ class FlutterPlugin implements Plugin<Project> {
             getPluginList().each { plugin ->
                 Project pluginProject = project.rootProject.findProject(plugin.key)
                 pluginProject.afterEvaluate {
-                    int pluginCompileSdkVersion = pluginProject.android.compileSdkVersion.substring(8) as int
+                    // Default to int min if using a preview version to skip the sdk check.
+                    int pluginCompileSdkVersion = Integer.MIN_VALUE;
+                    // Stable versions use ints, legacy preview uses string.
+                    if (getCompileSdkFromProject(pluginProject).isInteger()) {
+                        pluginCompileSdkVersion = getCompileSdkFromProject(pluginProject) as int;
+                    }
                     maxPluginCompileSdkVersion = Math.max(pluginCompileSdkVersion, maxPluginCompileSdkVersion)
                     String pluginNdkVersion = pluginProject.android.ndkVersion ?: ndkVersionIfUnspecified
                     maxPluginNdkVersion = mostRecentSemanticVersion(pluginNdkVersion, maxPluginNdkVersion)
@@ -515,6 +522,14 @@ class FlutterPlugin implements Plugin<Project> {
         }
     }
 
+    /**
+     * Returns the portion of the compileSdkVersion string that corresponds to either the numeric
+     * or string version.
+     */
+    private String getCompileSdkFromProject(Project gradleProject) {
+        return gradleProject.android.compileSdkVersion.substring(8);
+    }
+
     /**
      * Returns `true` if the given path contains an `android/build.gradle` file.
      */

packages/flutter_tools/test/android_preview_integration.shard/README.md

+# Android preview integration tests
+
+This directory contains integration tests which would otherwise live in `integration.shard`,
+but require a dependency on a CIPD-hosted preview version of Android (and therefore their own
+test shard). For additional information see the README in the `../integration.shard` directory.
\ No newline at end of file

packages/flutter_tools/test/integration.shard/flutter_build_preview_sdk.dart → packages/flutter_tools/test/android_preview_integration.shard/flutter_build_preview_sdk_test.dart

@@ -5,13 +5,17 @@
 import 'package:flutter_tools/src/base/file_system.dart';
 import 'package:flutter_tools/src/base/io.dart';
 
+import '../integration.shard/test_utils.dart';
 import '../src/common.dart';
-import 'test_utils.dart';
 
 void main() {
   late Directory tempDir;
   late String flutterBin;
   late Directory exampleAppDir;
+  late Directory pluginDir;
+  final RegExp compileSdkVersionMatch = RegExp(r'compileSdk [\w.]+');
+  final String builtApkPath = <String>['build', 'app', 'outputs', 'flutter-apk', 'app-debug.apk']
+      .join(platform.pathSeparator);
 
   setUp(() async {
     tempDir = createResolvedTempDirectorySync('flutter_plugin_test.');
@@ -20,7 +24,8 @@ void main() {
       'bin',
       'flutter',
     );
-    exampleAppDir = tempDir.childDirectory('aaa').childDirectory('example');
+    pluginDir = tempDir.childDirectory('aaa');
+    exampleAppDir = pluginDir.childDirectory('example');
 
     processManager.runSync(<String>[
       flutterBin,
@@ -40,12 +45,12 @@ void main() {
     'build succeeds targeting string compileSdkVersion',
     () async {
       final File buildGradleFile = exampleAppDir.childDirectory('android').childDirectory('app').childFile('build.gradle');
-      // write a build.gradle with compileSdk version as `android-Tiramisu` which is a string preview version
+      // write a build.gradle with compileSdkVersion as `android-UpsideDownCake` which is a string preview version
       buildGradleFile.writeAsStringSync(
-        buildGradleFile.readAsStringSync().replaceFirst('compileSdk flutter.compileSdkVersion', 'compileSdk "android-Tiramisu"'),
+        buildGradleFile.readAsStringSync().replaceFirst(compileSdkVersionMatch, 'compileSdkVersion "android-UpsideDownCake"'),
         flush: true
       );
-      expect(buildGradleFile.readAsStringSync(), contains('compileSdk "android-Tiramisu"'));
+      expect(buildGradleFile.readAsStringSync(), contains('compileSdkVersion "android-UpsideDownCake"'));
 
       final ProcessResult result = await processManager.run(<String>[
         flutterBin,
@@ -54,13 +59,13 @@ void main() {
         'apk',
         '--debug',
       ], workingDirectory: exampleAppDir.path);
-      expect(result.stdout, contains('Built build/app/outputs/flutter-apk/app-debug.apk.'));
       expect(exampleAppDir.childDirectory('build')
           .childDirectory('app')
           .childDirectory('outputs')
           .childDirectory('apk')
           .childDirectory('debug')
           .childFile('app-debug.apk').existsSync(), true);
+      expect(result.stdout, contains('Built $builtApkPath'));
     },
   );
 
@@ -68,12 +73,12 @@ void main() {
     'build succeeds targeting string compileSdkPreview',
     () async {
       final File buildGradleFile = exampleAppDir.childDirectory('android').childDirectory('app').childFile('build.gradle');
-      // write a build.gradle with compileSdkPreview as `Tiramisu` which is a string preview version
+      // write a build.gradle with compileSdkPreview as `UpsideDownCake` which is a string preview version
       buildGradleFile.writeAsStringSync(
-        buildGradleFile.readAsStringSync().replaceFirst('compileSdk flutter.compileSdkVersion', 'compileSdkPreview "Tiramisu"'),
+        buildGradleFile.readAsStringSync().replaceFirst(compileSdkVersionMatch, 'compileSdkPreview "UpsideDownCake"'),
         flush: true
       );
-      expect(buildGradleFile.readAsStringSync(), contains('compileSdkPreview "Tiramisu"'));
+      expect(buildGradleFile.readAsStringSync(), contains('compileSdkPreview "UpsideDownCake"'));
 
       final ProcessResult result = await processManager.run(<String>[
         flutterBin,
@@ -82,13 +87,49 @@ void main() {
         'apk',
         '--debug',
       ], workingDirectory: exampleAppDir.path);
-      expect(result.stdout, contains('Built build/app/outputs/flutter-apk/app-debug.apk.'));
       expect(exampleAppDir.childDirectory('build')
           .childDirectory('app')
           .childDirectory('outputs')
           .childDirectory('apk')
           .childDirectory('debug')
           .childFile('app-debug.apk').existsSync(), true);
+      expect(result.stdout, contains('Built $builtApkPath'));
+    },
+  );
+
+  test(
+    'build succeeds when both example app and plugin target compileSdkPreview',
+        () async {
+      final File appBuildGradleFile = exampleAppDir.childDirectory('android').childDirectory('app').childFile('build.gradle');
+      // write a build.gradle with compileSdkPreview as `UpsideDownCake` which is a string preview version
+      appBuildGradleFile.writeAsStringSync(
+          appBuildGradleFile.readAsStringSync().replaceFirst(compileSdkVersionMatch, 'compileSdkPreview "UpsideDownCake"'),
+          flush: true
+      );
+      expect(appBuildGradleFile.readAsStringSync(), contains('compileSdkPreview "UpsideDownCake"'));
+
+      final File pluginBuildGradleFile = pluginDir.childDirectory('android').childFile('build.gradle');
+      // change the plugin build.gradle to use a preview compile sdk version
+      pluginBuildGradleFile.writeAsStringSync(
+        pluginBuildGradleFile.readAsStringSync().replaceFirst(compileSdkVersionMatch, 'compileSdkPreview "UpsideDownCake"'),
+        flush: true
+      );
+      expect(pluginBuildGradleFile.readAsStringSync(), contains('compileSdkPreview "UpsideDownCake"'));
+
+      final ProcessResult result = await processManager.run(<String>[
+        flutterBin,
+        ...getLocalEngineArguments(),
+        'build',
+        'apk',
+        '--debug',
+      ], workingDirectory: exampleAppDir.path);
+      expect(exampleAppDir.childDirectory('build')
+          .childDirectory('app')
+          .childDirectory('outputs')
+          .childDirectory('apk')
+          .childDirectory('debug')
+          .childFile('app-debug.apk').existsSync(), true);
+      expect(result.stdout, contains('Built $builtApkPath'));
     },
   );
 }

packages/flutter_tools/test/integration.shard/README.md

@@ -20,3 +20,7 @@ information for the `flutter` tool (since they are black-box tests that
 run the tool as a subprocess, rather than being unit tests). For this
 reason, they are in a separate shard when running on continuous
 integration and are not run when calculating coverage.
+
+## Adding new test files
+
+When adding a new test file make sure that it ends with `_test.dart`, or else it will not be run.