使用 Gradle 解决 Android 模块化项目中的多语言支持

afterEvaluate {
    val configuration = configurations.getByName("implementation")
    val resolve = configuration.resolve()
    resolve.forEach {
        println(it.absolutePath)
    }
}

# Console Error #
A problem occurred configuring project ':app'.
> Resolving dependency configuration 'implementation' is not allowed as it is defined as 'canBeResolved=false'.
  Instead, a resolvable ('canBeResolved=true') dependency configuration that extends 'implementation' should be resolved.

//已忽略无关代码
//https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:build-system/gradle-core/src/main/java/com/android/build/gradle/internal/dependency/VariantDependenciesBuilder.java
package com.android.build.gradle.internal.dependency;
...
public class VariantDependenciesBuilder {

    ...
    private final Set<Configuration> compileClasspaths = Sets.newLinkedHashSet();

    public VariantDependenciesBuilder addSourceSet(@Nullable DefaultAndroidSourceSet sourceSet) {
        ....
        //获取compileOnly 
        compileClasspaths.add(configs.getByName(sourceSet.getCompileOnlyConfigurationName())); 
        //获取implementation
        final Configuration implementationConfig =
                    configs.getByName(sourceSet.getImplementationConfigurationName());
        
        compileClasspaths.add(implementationConfig);
        ....
    }
   
    public VariantDependencies build() {
        ...
        final ConfigurationContainer configurations = project.getConfigurations();
        final DependencyHandler dependencies = project.getDependencies();

        final String compileClasspathName = variantName + "CompileClasspath";
        Configuration compileClasspath = configurations.maybeCreate(compileClasspathName);
        compileClasspath.setVisible(false);
        compileClasspath.setDescription(
                "Resolved configuration for compilation for variant: " + variantName);
        compileClasspath.setExtendsFrom(compileClasspaths); //设置配置继承关系
        ...
        compileClasspath.setCanBeConsumed(false);
        compileClasspath
                .getResolutionStrategy()
                .sortArtifacts(ResolutionStrategy.SortOrder.CONSUMER_FIRST);
    }
}

dependencies {  
    implementation("androidx.core:core-ktx:1.9.0")  
    releaseImplementation("com.squareup.okhttp3:okhttp:4.11.0")  
    testImplementation(libs.junit)  
    androidTestImplementation(libs.androidx.test.ext.junit)  
    androidTestImplementation(libs.espresso.core)  
}  
  
afterEvaluate {  
    val configuration = configurations.getByName("releaseRuntimeClasspath")  
    val resolve = configuration.resolve()  
    resolve.forEach {  
        println(it.absolutePath)  
    }  
}

# Console Output #
> Configure project :app
/home/prosixe/.gradle/caches/modules-2/files-2.1/com.squareup.okhttp3/okhttp/4.11.0/436932d695b2c43f2c86b8111c596179cd133d56/okhttp-4.11.0.jar
/home/prosixe/.gradle/caches/modules-2/files-2.1/com.squareup.okio/okio-jvm/3.2.0/332d1c5dc82b0241cb1d35bb0901d28470cc89ca/okio-jvm-3.2.0.jar
/home/prosixe/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-jdk8/1.8.0/ed04f49e186a116753ad70d34f0ac2925d1d8020/kotlin-stdlib-jdk8-1.8.0.jar
/home/prosixe/.gradle/caches/modules-2/files-2.1/androidx.core/core/1.9.0/aa21c91d72e5d2a8dcc00c029ec65fc8d804ce02/core-1.9.0.aar
/home/prosixe/.gradle/caches/modules-2/files-2.1/androidx.core/core-ktx/1.9.0/b56f6b1bcb7882a9933c963907818da2094ae3a4/core-ktx-1.9.0.aar
/home/prosixe/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-jdk7/1.8.0/3c91271347f678c239607abb676d4032a7898427/kotlin-stdlib-jdk7-1.8.0.jar
/home/prosixe/.gradle/caches/modules-2/files-2.1/androidx.annotation/annotation-experimental/1.3.0/5087c6f545117dcd474e69e1a93cacec9d7334af/annotation-experimental-1.3.0.aar
....

//代码地址:https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:build-system/gradle-core/src/main/java/com/android/build/gradle/internal/DependencyConfigurator.kt
//ExtractAarTransform的注册
        registerTransform(
            ExtractAarTransform::class.java,
            aarOrJarTypeToConsume.aar,//AndroidArtifacts.ArtifactType.AAR
            AndroidArtifacts.ArtifactType.EXPLODED_AAR
        )
//AarTransform的注册 getTransformTargets是不同的转换目标属性，循环注册
        for (transformTarget in AarTransform.getTransformTargets(aarOrJarTypeToConsume)) {
            dependencies.registerTransform(
                AarTransform::class.java
            ) { spec ->
                spec.from.attribute(ArtifactTypeDefinition.ARTIFACT_TYPE_ATTRIBUTE, AndroidArtifacts.ArtifactType.EXPLODED_AAR.type)
                spec.from.attribute(Category.CATEGORY_ATTRIBUTE, libraryCategory)
                spec.to.attribute(ArtifactTypeDefinition.ARTIFACT_TYPE_ATTRIBUTE, transformTarget.type)
                spec.to.attribute(Category.CATEGORY_ATTRIBUTE, libraryCategory)
                spec.parameters.projectName.setDisallowChanges(project.name)
                spec.parameters.targetType.setDisallowChanges(transformTarget)
                spec.parameters.sharedLibSupport.setDisallowChanges(sharedLibSupport)
            }
        }

----From AarTransform
    @NonNull
    public static ArtifactType[] getTransformTargets(AarOrJarTypeToConsume aarOrJarTypeToConsume) {
        return new ArtifactType[] {
            aarOrJarTypeToConsume.getJar(),
            // For CLASSES, this transform is ues for runtime, and AarCompileClassesTransform is
            // used for compile
            ArtifactType.SHARED_CLASSES,
            ArtifactType.JAVA_RES,
            ArtifactType.SHARED_JAVA_RES,
            ArtifactType.MANIFEST,
            ArtifactType.ANDROID_RES,
            ArtifactType.ASSETS,
            ArtifactType.SHARED_ASSETS,
            ArtifactType.JNI,
            ArtifactType.SHARED_JNI,
            ArtifactType.AIDL,
            ArtifactType.RENDERSCRIPT,
            ArtifactType.UNFILTERED_PROGUARD_RULES,
            ArtifactType.LINT,
            ArtifactType.ANNOTATIONS,
            ArtifactType.PUBLIC_RES,
            ArtifactType.COMPILE_SYMBOL_LIST,
            ArtifactType.DATA_BINDING_ARTIFACT,
            ArtifactType.DATA_BINDING_BASE_CLASS_LOG_ARTIFACT,
            ArtifactType.RES_STATIC_LIBRARY,
            ArtifactType.RES_SHARED_STATIC_LIBRARY,
            ArtifactType.PREFAB_PACKAGE,
            ArtifactType.AAR_METADATA,
            ArtifactType.ART_PROFILE,
            ArtifactType.NAVIGATION_JSON,
        };
    }

afterEvaluate {
    val configuration = configurations.getByName("releaseRuntimeClasspath")
    val artifacts = configuration.incoming.artifactView {
        attributes.attribute(
            AndroidArtifacts.ARTIFACT_TYPE,
            AndroidArtifacts.ArtifactType.ANDROID_RES.type
        )
    }.artifacts
    artifacts.artifactFiles.forEach {
        println(it)
    }
}

#output 
/home/prosixe/.gradle/caches/transforms-3/b15e5c11ab5458dc40071e292632fa4c/transformed/core-1.9.0/res
/home/prosixe/.gradle/caches/transforms-3/5409291e0f20302a556f1f822f907835/transformed/core-ktx-1.9.0/res
/home/prosixe/.gradle/caches/transforms-3/7589258eaf55d137a37e590e9111e0d3/transformed/annotation-experimental-1.3.0/res
/home/prosixe/.gradle/caches/transforms-3/67e97da11edfa018e3236656720b711b/transformed/lifecycle-runtime-2.3.1/res

val extension = project.extensions.getByName("android") as BaseExtension  
val sourceSets = extension.sourceSets  
val mainSourceSets = sourceSets.findByName("main")  
val dirs = mainSourceSets!!.res.srcDirs