Change project.buildDir in standalone subprojects property (#91030)

dev/benchmarks/complex_layout/android/build.gradle

@@ -34,6 +34,8 @@ rootProject.buildDir = '../build'
 
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
     project.evaluationDependsOn(':app')
 
     dependencyLocking {

dev/benchmarks/macrobenchmarks/android/build.gradle

@@ -34,6 +34,8 @@ rootProject.buildDir = '../build'
 
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
     project.evaluationDependsOn(':app')
 
     dependencyLocking {

dev/benchmarks/microbenchmarks/android/build.gradle

@@ -34,6 +34,8 @@ rootProject.buildDir = '../build'
 
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
     project.evaluationDependsOn(':app')
 
     dependencyLocking {

dev/benchmarks/platform_views_layout/android/build.gradle

@@ -34,6 +34,8 @@ rootProject.buildDir = '../build'
 
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
     project.evaluationDependsOn(':app')
 
     dependencyLocking {

dev/benchmarks/platform_views_layout_hybrid_composition/android/build.gradle

@@ -34,6 +34,8 @@ rootProject.buildDir = '../build'
 
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
     project.evaluationDependsOn(':app')
 
     dependencyLocking {

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

@@ -34,6 +34,8 @@ rootProject.buildDir = '../build'
 
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
     project.evaluationDependsOn(':app')
 
     dependencyLocking {

dev/integration_tests/abstract_method_smoke_test/android/build.gradle

@@ -34,6 +34,8 @@ rootProject.buildDir = '../build'
 
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
     project.evaluationDependsOn(':app')
 
     dependencyLocking {

dev/integration_tests/android_embedding_v2_smoke_test/android/build.gradle

@@ -34,6 +34,8 @@ rootProject.buildDir = '../build'
 
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
     project.evaluationDependsOn(':app')
 
     dependencyLocking {

dev/integration_tests/android_semantics_testing/android/build.gradle

@@ -34,6 +34,8 @@ rootProject.buildDir = '../build'
 
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
     project.evaluationDependsOn(':app')
 
     dependencyLocking {

dev/integration_tests/android_views/android/build.gradle

@@ -34,6 +34,8 @@ rootProject.buildDir = '../build'
 
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
     project.evaluationDependsOn(':app')
 
     dependencyLocking {

dev/integration_tests/channels/android/build.gradle

@@ -34,6 +34,8 @@ rootProject.buildDir = '../build'
 
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
     project.evaluationDependsOn(':app')
 
     dependencyLocking {

dev/integration_tests/external_ui/android/build.gradle

@@ -34,6 +34,8 @@ rootProject.buildDir = '../build'
 
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
     project.evaluationDependsOn(':app')
 
     dependencyLocking {

dev/integration_tests/flavors/android/build.gradle

@@ -34,6 +34,8 @@ rootProject.buildDir = '../build'
 
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
     project.evaluationDependsOn(':app')
 
     dependencyLocking {

dev/integration_tests/flutter_gallery/android/build.gradle

@@ -34,6 +34,8 @@ rootProject.buildDir = '../build'
 
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
     project.evaluationDependsOn(':app')
 
     dependencyLocking {

dev/integration_tests/gradle_deprecated_settings/android/build.gradle

@@ -34,6 +34,8 @@ rootProject.buildDir = '../build'
 
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
     project.evaluationDependsOn(':app')
 
     dependencyLocking {

dev/integration_tests/hybrid_android_views/android/build.gradle

@@ -34,6 +34,8 @@ rootProject.buildDir = '../build'
 
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
     project.evaluationDependsOn(':app')
 
     dependencyLocking {

dev/integration_tests/non_nullable/android/build.gradle

@@ -34,6 +34,8 @@ rootProject.buildDir = '../build'
 
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
     project.evaluationDependsOn(':app')
 
     dependencyLocking {

dev/integration_tests/platform_interaction/android/build.gradle

@@ -34,6 +34,8 @@ rootProject.buildDir = '../build'
 
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
     project.evaluationDependsOn(':app')
 
     dependencyLocking {

dev/integration_tests/release_smoke_test/android/build.gradle

@@ -34,6 +34,8 @@ rootProject.buildDir = '../build'
 
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
     project.evaluationDependsOn(':app')
 
     dependencyLocking {

dev/integration_tests/ui/android/build.gradle

@@ -34,6 +34,8 @@ rootProject.buildDir = '../build'
 
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
     project.evaluationDependsOn(':app')
 
     dependencyLocking {

dev/manual_tests/android/build.gradle

@@ -34,6 +34,8 @@ rootProject.buildDir = '../build'
 
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
     project.evaluationDependsOn(':app')
 
     dependencyLocking {

examples/flutter_view/android/build.gradle

@@ -34,6 +34,8 @@ rootProject.buildDir = '../build'
 
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
     project.evaluationDependsOn(':app')
 
     dependencyLocking {

examples/hello_world/android/build.gradle

@@ -34,6 +34,8 @@ rootProject.buildDir = '../build'
 
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
     project.evaluationDependsOn(':app')
 
     dependencyLocking {

examples/image_list/android/build.gradle

@@ -34,6 +34,8 @@ rootProject.buildDir = '../build'
 
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
     project.evaluationDependsOn(':app')
 
     dependencyLocking {

examples/layers/android/build.gradle

@@ -34,6 +34,8 @@ rootProject.buildDir = '../build'
 
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
     project.evaluationDependsOn(':app')
 
     dependencyLocking {

examples/platform_channel/android/build.gradle

@@ -34,6 +34,8 @@ rootProject.buildDir = '../build'
 
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
     project.evaluationDependsOn(':app')
 
     dependencyLocking {

examples/platform_view/android/build.gradle

@@ -34,6 +34,8 @@ rootProject.buildDir = '../build'
 
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
     project.evaluationDependsOn(':app')
 
     dependencyLocking {

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

@@ -19,6 +19,8 @@ allprojects {
 rootProject.buildDir = '../build'
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
     project.evaluationDependsOn(':app')
 }
 

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

@@ -21,6 +21,8 @@ allprojects {
 rootProject.buildDir = '../build'
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
     project.evaluationDependsOn(':app')
 }
 

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

@@ -0,0 +1,85 @@
+// 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.
+
+// @dart = 2.8
+
+import 'package:file_testing/file_testing.dart';
+import 'package:flutter_tools/src/base/file_system.dart';
+
+import '../src/common.dart';
+import 'test_utils.dart';
+
+// Test the android/app/build directory not be created unexpectedly after
+// `flutter build` commands, see https://github.com/flutter/flutter/issues/91018.
+//
+// The easiest way to reproduce this issue is to create a plugin project, then run
+// `flutter build` command inside the `example` directory, so we create a plugin
+// project in the test.
+void main() {
+  Directory tempDir;
+  String flutterBin;
+  Directory exampleAppDir;
+
+  setUp(() async {
+    tempDir = createResolvedTempDirectorySync('flutter_plugin_test.');
+    flutterBin = fileSystem.path.join(
+      getFlutterRoot(),
+      'bin',
+      'flutter',
+    );
+    exampleAppDir = tempDir.childDirectory('aaa').childDirectory('example');
+
+    processManager.runSync(<String>[
+      flutterBin,
+      ...getLocalEngineArguments(),
+      'create',
+      '--template=plugin',
+      '--platforms=android',
+      'aaa',
+    ], workingDirectory: tempDir.path);
+  });
+
+  tearDown(() async {
+    tryToDelete(tempDir);
+  });
+
+  void _checkBuildDir() {
+    // The android/app/build directory should not exists
+    final Directory appBuildDir = fileSystem.directory(fileSystem.path.join(
+      exampleAppDir.path,
+      'android',
+      'app',
+      'build',
+    ));
+    expect(appBuildDir, isNot(exists));
+  }
+
+  test(
+    'android/app/build should not exists after flutter build apk',
+    () async {
+      processManager.runSync(<String>[
+        flutterBin,
+        ...getLocalEngineArguments(),
+        'build',
+        'apk',
+        '--target-platform=android-arm',
+      ], workingDirectory: exampleAppDir.path);
+      _checkBuildDir();
+    },
+  );
+
+  test(
+    'android/app/build should not exists after flutter build appbundle',
+    () async {
+      processManager.runSync(<String>[
+        flutterBin,
+        ...getLocalEngineArguments(),
+        'build',
+        'appbundle',
+        '--target-platform=android-arm',
+      ], workingDirectory: exampleAppDir.path);
+      _checkBuildDir();
+    },
+  );
+}

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

@@ -131,6 +131,8 @@ class BasicDeferredComponentsConfig extends DeferredComponentsConfig {
   rootProject.buildDir = '../build'
   subprojects {
       project.buildDir = "${rootProject.buildDir}/${project.name}"
+  }
+  subprojects {
       project.evaluationDependsOn(':app')
   }
 

packages/integration_test/example/android/build.gradle

@@ -34,6 +34,8 @@ rootProject.buildDir = '../build'
 
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
     project.evaluationDependsOn(':app')
 
     dependencyLocking {