如何在 Android Studio 中正确创建从 AAR 导入的 Android 库模块？

Question

AAR 的 Android 模块库是否损坏？

自从我升级我们的构建以使用 Android Gradle 插件的 3.1.2 后，我遇到了这个问题，即构建无法在 AAR 中找到构建版本，包括 jniLibs/ 和 libs/ 文件夹中的 jar。这曾经在 Android Gradle 3.1.2 插件之前工作。我只是将 aar 称为“library.aar”：

org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':toolbarsample:transformClassesWithInstantRunForDebug'.
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:100)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:70)
    at org.gradle.api.internal.tasks.execution.OutputDirectoryCreatingTaskExecuter.execute(OutputDirectoryCreatingTaskExecuter.java:51)
    at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:62)
    at org.gradle.api.internal.tasks.execution.ResolveTaskOutputCachingStateExecuter.execute(ResolveTaskOutputCachingStateExecuter.java:54)
    at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:60)
    at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:97)
    at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:87)
    at org.gradle.api.internal.tasks.execution.ResolveTaskArtifactStateTaskExecuter.execute(ResolveTaskArtifactStateTaskExecuter.java:52)
    at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:52)
    at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:54)
    at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43)
    at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:34)
    at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker$1.run(DefaultTaskGraphExecuter.java:248)
    at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336)
    at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328)
    at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199)
    at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110)
    at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:241)
    at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:230)
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.processTask(DefaultTaskPlanExecutor.java:123)
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.access$200(DefaultTaskPlanExecutor.java:79)
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker$1.execute(DefaultTaskPlanExecutor.java:104)
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker$1.execute(DefaultTaskPlanExecutor.java:98)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.execute(DefaultTaskExecutionPlan.java:626)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.executeWithTask(DefaultTaskExecutionPlan.java:581)
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.run(DefaultTaskPlanExecutor.java:98)
    at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:63)
    at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:46)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.RuntimeException: com.android.build.api.transform.TransformException: java.lang.RuntimeException: java.lang.RuntimeException: java.io.IOException: Failed to find byte code for "class in jar file in the libs folder of the AAR"

失败的任务是 transformClassesWithInstantRunForDebug。当我禁用即时运行时，我遇到了一个问题，即我的应用程序无法在运行时运行，因为它找不到我的 jniLibs/ 文件夹，在该文件夹中，插件无法找到捆绑为其中一部分的某些 java 类的字节码libs/ 文件夹中的 jars。

但是，如果我通过将以下行添加到我的应用程序的 build.gradle 将 aar 添加到应用程序的 libs 文件夹中，我的应用程序可以编译并运行正常！ implementation fileTree(include: ['*.jar', '*.aar'], dir: 'libs')

我什至尝试将库作为 gradle 库模块导入，它会自动生成这个 build.gradle：

configurations.maybeCreate("default")
artifacts.add("default", file('library.aar'))

我的 aar 是使用这些 build.gradle args 构建的：

apply plugin: 'com.android.library'

android {
    compileSdkVersion versions.android.sdk
    buildToolsVersion versions.android.buildTools

    defaultConfig {
        minSdkVersion versions.android.minSdk
        targetSdkVersion versions.android.sdk
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}
dependencies {
    api fileTree(include: ['*.jar'], dir: 'libs')
    implementation libraries.android

    testImplementation "junit:junit:$versions.junit"
}

有人遇到同样的问题吗？我不知道这里发生了什么......

Answer 1

所以我已经回答了我自己的问题，但可能不是大多数人所期望的那样。

详细信息在这里：https://www.reddit.com/r/androiddev/comments/9rlimj/android_library_dependency_management/e8i0qq2/?context=3

tl;dr 我们正在按文件使用 AAR，而不是作为 gradle 库项目