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？

自从我将构建升级为使用 Android Gradle 插件的 3.1.2 后，我遇到了这个问题，构建无法在 AAR 中找到构建版本包括jniLibs/ 和 libs/ 文件夹中的 jars。这曾经在 Android Gradle 3.1.2 插件之前工作。我要打电话给 aar "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$EventFiringTaskWorker.run(DefaultTaskGraphExecuter.java:248)
    at org.gradle.internal.progress.DefaultBuildOperationExecutor$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$TaskExecutorWorker.access0(DefaultTaskPlanExecutor.java:79)
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.execute(DefaultTaskPlanExecutor.java:104)
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.execute(DefaultTaskPlanExecutor.java:98)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.execute(DefaultTaskExecutionPlan.java:626)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.executeWithTask(DefaultTaskExecutionPlan.java:581)
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.run(DefaultTaskPlanExecutor.java:98)
    at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:63)
    at org.gradle.internal.concurrent.ManagedExecutorImpl.run(ManagedExecutorImpl.java:46)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$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，我的应用程序在运行时没有运行，因为它找不到我的 jniLibs/ 文件夹，插件无法找到字节码对于某些 java 类，它们被捆绑为 libs/ 文件夹中的一个 jar 的一部分。

但是，如果我通过将以下行添加到我的应用程序的 build.gradle 来将 aar 添加到应用程序的 libs 文件夹，我的应用程序编译并且运行没问题！ implementation fileTree(include: ['*.jar', '*.aar'], dir: 'libs')

我什至尝试将库作为 gradle 库模块导入，它会自动生成此 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。

完整的细节在这里：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我们的 AAR，而不是作为 gradle 库项目

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

How do you correctly create an Android Library Module Imported from an AAR in Android Studio?

java

android

module

gradle

aar