Reland "Warn when Gradle plugins are applied using the legacy apply s…

…cript method (#140103)

> This PR relands #139690 which was reverted in #140102

This PR adds a deprecation message when Android build is using the legacy "apply script method" way of applying Flutter's Gradle plugins (that is: [`flutter.gradle`](https://github.com/flutter/flutter/blob/3.16.0/packages/flutter_tools/gradle/flutter.gradle) and [`app_plugin_loader.gradle`](https://github.com/flutter/flutter/blob/3.16.0/packages/flutter_tools/gradle/app_plugin_loader.gradle)).

See also:
- #121541
  - in particular flutter/flutter#121541 (comment)
- #135392
  - and PR that add the migration guide: [#9857](flutter/website#9857)

- I think either `logger.error` or `logger.quiet` must be used, because all other error levels are not shown during `flutter build apk` (and that's what most people use).

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

@@ -2,22 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-def localProperties = new Properties()
-def localPropertiesFile = rootProject.file('local.properties')
-if (localPropertiesFile.exists()) {
-    localPropertiesFile.withInputStream { stream ->
-        localProperties.load(stream)
-    }
-}
-
-def flutterRoot = localProperties.getProperty('flutter.sdk')
-if (flutterRoot == null) {
-    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
+plugins {
+    id "com.android.application"
+    id "dev.flutter.flutter-gradle-plugin"
+    id "org.jetbrains.kotlin.android"
 }
 
-apply plugin: 'com.android.application'
-apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
-
 android {
     namespace "com.yourcompany.integration_ui"
     compileSdk flutter.compileSdkVersion

dev/integration_tests/ui/android/build.gradle

@@ -6,23 +6,6 @@
 // To update all the build.gradle files in the Flutter repo,
 // See dev/tools/bin/generate_gradle_lockfiles.dart.
 
-buildscript {
-    ext.kotlin_version = '1.7.10'
-    repositories {
-        google()
-        mavenCentral()
-    }
-
-    dependencies {
-        classpath 'com.android.tools.build:gradle:7.3.0'
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-    }
-
-    configurations.classpath {
-        resolutionStrategy.activateDependencyLocking()
-    }
-}
-
 allprojects {
     repositories {
         google()

dev/integration_tests/ui/android/project-app.lockfile

@@ -38,6 +38,7 @@ com.google.j2objc:j2objc-annotations:1.3=debugRuntimeClasspath,debugUnitTestRunt
 com.squareup:javawriter:2.1.1=debugAndroidTestCompileClasspath,debugCompileClasspath,debugRuntimeClasspath,debugUnitTestCompileClasspath,debugUnitTestRuntimeClasspath,profileCompileClasspath,profileRuntimeClasspath,profileUnitTestCompileClasspath,profileUnitTestRuntimeClasspath,releaseCompileClasspath,releaseRuntimeClasspath,releaseUnitTestCompileClasspath,releaseUnitTestRuntimeClasspath
 javax.inject:javax.inject:1=debugAndroidTestCompileClasspath,debugCompileClasspath,debugRuntimeClasspath,debugUnitTestCompileClasspath,debugUnitTestRuntimeClasspath,profileCompileClasspath,profileRuntimeClasspath,profileUnitTestCompileClasspath,profileUnitTestRuntimeClasspath,releaseCompileClasspath,releaseRuntimeClasspath,releaseUnitTestCompileClasspath,releaseUnitTestRuntimeClasspath
 junit:junit:4.12=debugAndroidTestCompileClasspath,debugCompileClasspath,debugRuntimeClasspath,debugUnitTestCompileClasspath,debugUnitTestRuntimeClasspath,profileCompileClasspath,profileRuntimeClasspath,profileUnitTestCompileClasspath,profileUnitTestRuntimeClasspath,releaseCompileClasspath,releaseRuntimeClasspath,releaseUnitTestCompileClasspath,releaseUnitTestRuntimeClasspath
+net.java.dev.jna:jna:5.6.0=kotlinCompilerClasspath,kotlinKlibCommonizerClasspath
 net.sf.kxml:kxml2:2.3.0=debugAndroidTestCompileClasspath,debugCompileClasspath,debugRuntimeClasspath,debugUnitTestCompileClasspath,debugUnitTestRuntimeClasspath,profileCompileClasspath,profileRuntimeClasspath,profileUnitTestCompileClasspath,profileUnitTestRuntimeClasspath,releaseCompileClasspath,releaseRuntimeClasspath,releaseUnitTestCompileClasspath,releaseUnitTestRuntimeClasspath
 org.checkerframework:checker-compat-qual:2.5.5=debugRuntimeClasspath,debugUnitTestRuntimeClasspath,profileRuntimeClasspath,profileUnitTestRuntimeClasspath,releaseRuntimeClasspath,releaseUnitTestRuntimeClasspath
 org.codehaus.mojo:animal-sniffer-annotations:1.18=debugRuntimeClasspath,debugUnitTestRuntimeClasspath,profileRuntimeClasspath,profileUnitTestRuntimeClasspath,releaseRuntimeClasspath,releaseUnitTestRuntimeClasspath
@@ -48,16 +49,22 @@ org.jacoco:org.jacoco.agent:0.8.7=androidJacocoAnt
 org.jacoco:org.jacoco.ant:0.8.7=androidJacocoAnt
 org.jacoco:org.jacoco.core:0.8.7=androidJacocoAnt
 org.jacoco:org.jacoco.report:0.8.7=androidJacocoAnt
-org.jetbrains.kotlin:kotlin-stdlib-common:1.5.31=debugAndroidTestCompileClasspath,debugCompileClasspath,debugRuntimeClasspath,debugUnitTestCompileClasspath,debugUnitTestRuntimeClasspath,profileCompileClasspath,profileRuntimeClasspath,profileUnitTestCompileClasspath,profileUnitTestRuntimeClasspath,releaseCompileClasspath,releaseRuntimeClasspath,releaseUnitTestCompileClasspath,releaseUnitTestRuntimeClasspath
-org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.5.30=debugAndroidTestCompileClasspath,debugCompileClasspath,debugRuntimeClasspath,debugUnitTestCompileClasspath,debugUnitTestRuntimeClasspath,profileCompileClasspath,profileRuntimeClasspath,profileUnitTestCompileClasspath,profileUnitTestRuntimeClasspath,releaseCompileClasspath,releaseRuntimeClasspath,releaseUnitTestCompileClasspath,releaseUnitTestRuntimeClasspath
-org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.5.30=debugAndroidTestCompileClasspath,debugCompileClasspath,debugRuntimeClasspath,debugUnitTestCompileClasspath,debugUnitTestRuntimeClasspath,profileCompileClasspath,profileRuntimeClasspath,profileUnitTestCompileClasspath,profileUnitTestRuntimeClasspath,releaseCompileClasspath,releaseRuntimeClasspath,releaseUnitTestCompileClasspath,releaseUnitTestRuntimeClasspath
-org.jetbrains.kotlin:kotlin-stdlib:1.5.31=debugAndroidTestCompileClasspath,debugCompileClasspath,debugRuntimeClasspath,debugUnitTestCompileClasspath,debugUnitTestRuntimeClasspath,profileCompileClasspath,profileRuntimeClasspath,profileUnitTestCompileClasspath,profileUnitTestRuntimeClasspath,releaseCompileClasspath,releaseRuntimeClasspath,releaseUnitTestCompileClasspath,releaseUnitTestRuntimeClasspath
+org.jetbrains.intellij.deps:trove4j:1.0.20200330=kotlinCompilerClasspath,kotlinKlibCommonizerClasspath
+org.jetbrains.kotlin:kotlin-compiler-embeddable:1.7.0=kotlinCompilerClasspath,kotlinKlibCommonizerClasspath
+org.jetbrains.kotlin:kotlin-daemon-embeddable:1.7.0=kotlinCompilerClasspath,kotlinKlibCommonizerClasspath
+org.jetbrains.kotlin:kotlin-klib-commonizer-embeddable:1.7.0=kotlinKlibCommonizerClasspath
+org.jetbrains.kotlin:kotlin-reflect:1.7.0=kotlinCompilerClasspath,kotlinKlibCommonizerClasspath
+org.jetbrains.kotlin:kotlin-script-runtime:1.7.0=kotlinCompilerClasspath,kotlinKlibCommonizerClasspath
+org.jetbrains.kotlin:kotlin-stdlib-common:1.7.0=debugAndroidTestCompileClasspath,debugCompileClasspath,debugRuntimeClasspath,debugUnitTestCompileClasspath,debugUnitTestRuntimeClasspath,kotlinCompilerClasspath,kotlinKlibCommonizerClasspath,profileCompileClasspath,profileRuntimeClasspath,profileUnitTestCompileClasspath,profileUnitTestRuntimeClasspath,releaseCompileClasspath,releaseRuntimeClasspath,releaseUnitTestCompileClasspath,releaseUnitTestRuntimeClasspath
+org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.7.0=debugAndroidTestCompileClasspath,debugCompileClasspath,debugRuntimeClasspath,debugUnitTestCompileClasspath,debugUnitTestRuntimeClasspath,profileCompileClasspath,profileRuntimeClasspath,profileUnitTestCompileClasspath,profileUnitTestRuntimeClasspath,releaseCompileClasspath,releaseRuntimeClasspath,releaseUnitTestCompileClasspath,releaseUnitTestRuntimeClasspath
+org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.7.0=debugAndroidTestCompileClasspath,debugCompileClasspath,debugRuntimeClasspath,debugUnitTestCompileClasspath,debugUnitTestRuntimeClasspath,profileCompileClasspath,profileRuntimeClasspath,profileUnitTestCompileClasspath,profileUnitTestRuntimeClasspath,releaseCompileClasspath,releaseRuntimeClasspath,releaseUnitTestCompileClasspath,releaseUnitTestRuntimeClasspath
+org.jetbrains.kotlin:kotlin-stdlib:1.7.0=debugAndroidTestCompileClasspath,debugCompileClasspath,debugRuntimeClasspath,debugUnitTestCompileClasspath,debugUnitTestRuntimeClasspath,kotlinCompilerClasspath,kotlinKlibCommonizerClasspath,profileCompileClasspath,profileRuntimeClasspath,profileUnitTestCompileClasspath,profileUnitTestRuntimeClasspath,releaseCompileClasspath,releaseRuntimeClasspath,releaseUnitTestCompileClasspath,releaseUnitTestRuntimeClasspath
 org.jetbrains.kotlinx:kotlinx-coroutines-android:1.5.2=debugAndroidTestCompileClasspath,debugCompileClasspath,debugRuntimeClasspath,debugUnitTestCompileClasspath,debugUnitTestRuntimeClasspath,profileCompileClasspath,profileRuntimeClasspath,profileUnitTestCompileClasspath,profileUnitTestRuntimeClasspath,releaseCompileClasspath,releaseRuntimeClasspath,releaseUnitTestCompileClasspath,releaseUnitTestRuntimeClasspath
 org.jetbrains.kotlinx:kotlinx-coroutines-core-jvm:1.5.2=debugAndroidTestCompileClasspath,debugCompileClasspath,debugRuntimeClasspath,debugUnitTestCompileClasspath,debugUnitTestRuntimeClasspath,profileCompileClasspath,profileRuntimeClasspath,profileUnitTestCompileClasspath,profileUnitTestRuntimeClasspath,releaseCompileClasspath,releaseRuntimeClasspath,releaseUnitTestCompileClasspath,releaseUnitTestRuntimeClasspath
 org.jetbrains.kotlinx:kotlinx-coroutines-core:1.5.2=debugAndroidTestCompileClasspath,debugCompileClasspath,debugRuntimeClasspath,debugUnitTestCompileClasspath,debugUnitTestRuntimeClasspath,profileCompileClasspath,profileRuntimeClasspath,profileUnitTestCompileClasspath,profileUnitTestRuntimeClasspath,releaseCompileClasspath,releaseRuntimeClasspath,releaseUnitTestCompileClasspath,releaseUnitTestRuntimeClasspath
-org.jetbrains:annotations:13.0=debugAndroidTestCompileClasspath,debugCompileClasspath,debugRuntimeClasspath,debugUnitTestCompileClasspath,debugUnitTestRuntimeClasspath,profileCompileClasspath,profileRuntimeClasspath,profileUnitTestCompileClasspath,profileUnitTestRuntimeClasspath,releaseCompileClasspath,releaseRuntimeClasspath,releaseUnitTestCompileClasspath,releaseUnitTestRuntimeClasspath
+org.jetbrains:annotations:13.0=debugAndroidTestCompileClasspath,debugCompileClasspath,debugRuntimeClasspath,debugUnitTestCompileClasspath,debugUnitTestRuntimeClasspath,kotlinCompilerClasspath,kotlinKlibCommonizerClasspath,profileCompileClasspath,profileRuntimeClasspath,profileUnitTestCompileClasspath,profileUnitTestRuntimeClasspath,releaseCompileClasspath,releaseRuntimeClasspath,releaseUnitTestCompileClasspath,releaseUnitTestRuntimeClasspath
 org.ow2.asm:asm-analysis:9.1=androidJacocoAnt
 org.ow2.asm:asm-commons:9.1=androidJacocoAnt
 org.ow2.asm:asm-tree:9.1=androidJacocoAnt
 org.ow2.asm:asm:9.1=androidJacocoAnt
-empty=androidApis,androidJdkImage,androidTestUtil,coreLibraryDesugaring,debugAndroidTestAnnotationProcessorClasspath,debugAndroidTestRuntimeClasspath,debugAnnotationProcessorClasspath,debugReverseMetadataValues,debugUnitTestAnnotationProcessorClasspath,debugWearBundling,lintChecks,lintPublish,profileAnnotationProcessorClasspath,profileReverseMetadataValues,profileUnitTestAnnotationProcessorClasspath,profileWearBundling,releaseAnnotationProcessorClasspath,releaseReverseMetadataValues,releaseUnitTestAnnotationProcessorClasspath,releaseWearBundling
+empty=androidApis,androidJdkImage,androidTestApiDependenciesMetadata,androidTestCompileOnlyDependenciesMetadata,androidTestDebugApiDependenciesMetadata,androidTestDebugCompileOnlyDependenciesMetadata,androidTestDebugImplementationDependenciesMetadata,androidTestDebugIntransitiveDependenciesMetadata,androidTestDebugRuntimeOnlyDependenciesMetadata,androidTestImplementationDependenciesMetadata,androidTestIntransitiveDependenciesMetadata,androidTestProfileApiDependenciesMetadata,androidTestProfileCompileOnlyDependenciesMetadata,androidTestProfileImplementationDependenciesMetadata,androidTestProfileIntransitiveDependenciesMetadata,androidTestProfileRuntimeOnlyDependenciesMetadata,androidTestReleaseApiDependenciesMetadata,androidTestReleaseCompileOnlyDependenciesMetadata,androidTestReleaseImplementationDependenciesMetadata,androidTestReleaseIntransitiveDependenciesMetadata,androidTestReleaseRuntimeOnlyDependenciesMetadata,androidTestRuntimeOnlyDependenciesMetadata,androidTestUtil,compileOnlyDependenciesMetadata,coreLibraryDesugaring,debugAndroidTestAnnotationProcessorClasspath,debugAndroidTestApiDependenciesMetadata,debugAndroidTestCompileOnlyDependenciesMetadata,debugAndroidTestImplementationDependenciesMetadata,debugAndroidTestIntransitiveDependenciesMetadata,debugAndroidTestRuntimeClasspath,debugAndroidTestRuntimeOnlyDependenciesMetadata,debugAnnotationProcessorClasspath,debugCompileOnlyDependenciesMetadata,debugIntransitiveDependenciesMetadata,debugReverseMetadataValues,debugRuntimeOnlyDependenciesMetadata,debugUnitTestAnnotationProcessorClasspath,debugUnitTestApiDependenciesMetadata,debugUnitTestCompileOnlyDependenciesMetadata,debugUnitTestImplementationDependenciesMetadata,debugUnitTestIntransitiveDependenciesMetadata,debugUnitTestRuntimeOnlyDependenciesMetadata,debugWearBundling,intransitiveDependenciesMetadata,kotlinCompilerPluginClasspath,kotlinCompilerPluginClasspathDebug,kotlinCompilerPluginClasspathDebugAndroidTest,kotlinCompilerPluginClasspathDebugUnitTest,kotlinCompilerPluginClasspathProfile,kotlinCompilerPluginClasspathProfileUnitTest,kotlinCompilerPluginClasspathRelease,kotlinCompilerPluginClasspathReleaseUnitTest,kotlinNativeCompilerPluginClasspath,lintChecks,lintPublish,profileAnnotationProcessorClasspath,profileCompileOnlyDependenciesMetadata,profileIntransitiveDependenciesMetadata,profileReverseMetadataValues,profileRuntimeOnlyDependenciesMetadata,profileUnitTestAnnotationProcessorClasspath,profileUnitTestApiDependenciesMetadata,profileUnitTestCompileOnlyDependenciesMetadata,profileUnitTestImplementationDependenciesMetadata,profileUnitTestIntransitiveDependenciesMetadata,profileUnitTestRuntimeOnlyDependenciesMetadata,profileWearBundling,releaseAnnotationProcessorClasspath,releaseCompileOnlyDependenciesMetadata,releaseIntransitiveDependenciesMetadata,releaseReverseMetadataValues,releaseRuntimeOnlyDependenciesMetadata,releaseUnitTestAnnotationProcessorClasspath,releaseUnitTestApiDependenciesMetadata,releaseUnitTestCompileOnlyDependenciesMetadata,releaseUnitTestImplementationDependenciesMetadata,releaseUnitTestIntransitiveDependenciesMetadata,releaseUnitTestRuntimeOnlyDependenciesMetadata,releaseWearBundling,runtimeOnlyDependenciesMetadata,testApiDependenciesMetadata,testCompileOnlyDependenciesMetadata,testDebugApiDependenciesMetadata,testDebugCompileOnlyDependenciesMetadata,testDebugImplementationDependenciesMetadata,testDebugIntransitiveDependenciesMetadata,testDebugRuntimeOnlyDependenciesMetadata,testFixturesApiDependenciesMetadata,testFixturesCompileOnlyDependenciesMetadata,testFixturesDebugApiDependenciesMetadata,testFixturesDebugCompileOnlyDependenciesMetadata,testFixturesDebugImplementationDependenciesMetadata,testFixturesDebugIntransitiveDependenciesMetadata,testFixturesDebugRuntimeOnlyDependenciesMetadata,testFixturesImplementationDependenciesMetadata,testFixturesIntransitiveDependenciesMetadata,testFixturesProfileApiDependenciesMetadata,testFixturesProfileCompileOnlyDependenciesMetadata,testFixturesProfileImplementationDependenciesMetadata,testFixturesProfileIntransitiveDependenciesMetadata,testFixturesProfileRuntimeOnlyDependenciesMetadata,testFixturesReleaseApiDependenciesMetadata,testFixturesReleaseCompileOnlyDependenciesMetadata,testFixturesReleaseImplementationDependenciesMetadata,testFixturesReleaseIntransitiveDependenciesMetadata,testFixturesReleaseRuntimeOnlyDependenciesMetadata,testFixturesRuntimeOnlyDependenciesMetadata,testImplementationDependenciesMetadata,testIntransitiveDependenciesMetadata,testProfileApiDependenciesMetadata,testProfileCompileOnlyDependenciesMetadata,testProfileImplementationDependenciesMetadata,testProfileIntransitiveDependenciesMetadata,testProfileRuntimeOnlyDependenciesMetadata,testReleaseApiDependenciesMetadata,testReleaseCompileOnlyDependenciesMetadata,testReleaseImplementationDependenciesMetadata,testReleaseIntransitiveDependenciesMetadata,testReleaseRuntimeOnlyDependenciesMetadata,testRuntimeOnlyDependenciesMetadata

dev/integration_tests/ui/android/settings.gradle

@@ -18,11 +18,17 @@ pluginManagement {
 
     includeBuild("${settings.ext.flutterSdkPath}/packages/flutter_tools/gradle")
 
-    plugins {
-        id "dev.flutter.flutter-gradle-plugin" version "1.0.0" apply false
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
     }
 }
 
-include ":app"
+plugins {
+    id "dev.flutter.flutter-plugin-loader" version "1.0.0"
+    id "com.android.application" version "7.3.0" apply false
+    id "org.jetbrains.kotlin.android" version "1.7.0" apply false
+}
 
-apply from: "${settings.ext.flutterSdkPath}/packages/flutter_tools/gradle/app_plugin_loader.gradle"
+include ":app"

packages/flutter_tools/gradle/app_plugin_loader.gradle

@@ -5,5 +5,11 @@
 // This file exists solely for the compatibility with projects that have
 // not migrated to the declarative apply of the Flutter App Plugin Loader Gradle Plugin.
 
+logger.error("You are applying Flutter's app_plugin_loader Gradle plugin \
+imperatively using the apply script method, which is deprecated and will be \
+removed in a future release. Migrate to applying Gradle plugins with the \
+declarative plugins block: https://flutter.dev/go/flutter-gradle-plugin-apply\n\
+")
+
 def pathToThisDirectory = buildscript.sourceFile.parentFile
 apply from: "$pathToThisDirectory/src/main/groovy/app_plugin_loader.groovy"

packages/flutter_tools/gradle/flutter.gradle

@@ -5,5 +5,10 @@
 // This file exists solely for the compatibility with projects that have
 // not migrated to the declarative apply of the Flutter Gradle Plugin.
 
+logger.error("You are applying Flutter's main Gradle plugin imperatively using \
+the apply script method, which is deprecated and will be removed in a future \
+release. Migrate to applying Gradle plugins with the declarative plugins \
+block: https://flutter.dev/go/flutter-gradle-plugin-apply\n")
+
 def pathToThisDirectory = buildscript.sourceFile.parentFile
 apply from: "$pathToThisDirectory/src/main/groovy/flutter.groovy"