Class 未在 aar 中找到

Question

当调用 GoogleApiAvailability 时，我的 Android 库 (aar) 中出现 class 未找到异常。

    Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.android.gms.common.GoogleApiAvailability" on path: DexPathList[[zip file "/data/app/com.myunityplugin.PushNotifications-1/base.apk"],nativeLibraryDirectories=[/data/app/com.myunityplugin.PushNotifications-1/lib/arm, /vendor/lib, /system/lib]]

错误是不言自明的，但我不确定我做错了什么。我是 gradle 和 AndroidStudio 的新手。

我的 gradle.build 中有以下依赖项：

    compile 'com.google.android.gms:play-services:8.4.0'
    compile 'com.google.android.gms:play-services-gcm:8.4.0'

我认为问题在于 play-services 库需要包含在 aar 中，而编译不会这样做。我尝试使用 'runtime' 但我得到 "gradle dsl runtime not found".

问题：

这是我需要在我的 aar 中包含播放服务库的问题吗？我该如何实现？（如果没有，我该如何解决这个问题）
我需要指定 play-services 还是 play-services-gcm 就足够了？

错误信息/设置

导致错误的行

GoogleApiAvailability ServiceAvailability = GoogleApiAvailability.getInstance();

异常：

05-23 05:38:48.221 28055-28055/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.myunityplugin.PushNotifications, PID: 28055
java.lang.NoClassDefFoundError: Failed resolution of: Lcom/google/android/gms/common/GoogleApiAvailability;
   at com.myplugin.unitynotification.GCM.GCM.checkPlayServices(GCM.java:33)
   at com.myplugin.unitynotification.GCM.MainActivity.onCreate(MainActivity.java:80)
   at android.app.Activity.performCreate(Activity.java:6550)
   at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1120)
   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3108)
   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3263)
   at android.app.ActivityThread.access00(ActivityThread.java:197)
   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1687)
   at android.os.Handler.dispatchMessage(Handler.java:102)
   at android.os.Looper.loop(Looper.java:145)
   at android.app.ActivityThread.main(ActivityThread.java:6897)
   at java.lang.reflect.Method.invoke(Native Method)
   at java.lang.reflect.Method.invoke(Method.java:372)
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.android.gms.common.GoogleApiAvailability" on path: DexPathList[[zip file "/data/app/com.myunityplugin.PushNotifications-1/base.apk"],nativeLibraryDirectories=[/data/app/com.myunityplugin.PushNotifications-1/lib/arm, /vendor/lib, /system/lib]]
   at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
   at com.myplugin.unitynotification.GCM.GCM.checkPlayServices(GCM.java:33) 
   at com.myplugin.unitynotification.GCM.MainActivity.onCreate(MainActivity.java:80) 
   at android.app.Activity.performCreate(Activity.java:6550) 
   at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1120) 
   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3108) 
   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3263) 
   at android.app.ActivityThread.access00(ActivityThread.java:197) 
   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1687) 
   at android.os.Handler.dispatchMessage(Handler.java:102) 
   at android.os.Looper.loop(Looper.java:145) 
   at android.app.ActivityThread.main(ActivityThread.java:6897) 
   at java.lang.reflect.Method.invoke(Native Method) 
   at java.lang.reflect.Method.invoke(Method.java:372) 
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404) 
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199) 
    Suppressed: java.lang.ClassNotFoundException: com.google.android.gms.common.GoogleApiAvailability
   at java.lang.Class.classForName(Native Method)
   at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
   at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
        ... 16 more
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available

应用级别build.gradle

apply plugin: 'com.android.library'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.2"

    defaultConfig {
        minSdkVersion 19
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.2.1'
    compile 'com.google.android.gms:play-services:8.4.0'
    compile 'com.google.android.gms:play-services-gcm:8.4.0'
    provided files('lib-not-include/classes.jar')
}

项目级别gradle.build

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:1.5.0'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

Answer 1

aar 文件 不包含嵌套（或 transitive）依赖关系 并且没有 pom描述库使用的依赖项的文件。

这意味着，如果您使用 flatDir 存储库导入 aar 文件，您还必须在项目中指定依赖项。

您应该使用 maven 存储库（您必须在私有或 publicmaven 存储库中发布该库），您不会遇到同样的问题。
在这种情况下，gradle 使用包含依赖项列表的 pom 文件下载依赖项。

Class 未在 aar 中找到

Class not found in aar

android

gradle

google-play-services

android-gradle-plugin

aar

错误信息/设置