使用firebase时Android应用错误java.lang.NoClassDefFoundError

我有一个使用Firebase显示广告的应用。问题是有些设备（似乎只有Android 4.4设备）崩溃。这里是崩溃报告：使用firebase时Android应用错误java.lang.NoClassDefFoundError

java.lang.NoClassDefFoundError: 
    at com.google.firebase.FirebaseApp.initializeApp (Unknown Source) 
    at com.google.firebase.provider.FirebaseInitProvider.onCreate (Unknown Source) 
    at android.content.ContentProvider.attachInfo (ContentProvider.java:1591) 
    at android.content.ContentProvider.attachInfo (ContentProvider.java:1562) 
    at com.google.firebase.provider.FirebaseInitProvider.attachInfo (Unknown Source) 
    at android.app.ActivityThread.installProvider (ActivityThread.java:5035) 
    at android.app.ActivityThread.installContentProviders (ActivityThread.java:4627) 
    at android.app.ActivityThread.handleBindApplication (ActivityThread.java:4567) 
    at android.app.ActivityThread.access$1800 (ActivityThread.java:138) 
    at android.app.ActivityThread$H.handleMessage (ActivityThread.java:1299) 
    at android.os.Handler.dispatchMessage (Handler.java:102) 
    at android.os.Looper.loop (Looper.java:136) 
    at android.app.ActivityThread.main (ActivityThread.java:5262) 
    at java.lang.reflect.Method.invokeNative (Native Method) 
    at java.lang.reflect.Method.invoke (Method.java:515) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:851) 
    at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:667) 
    at dalvik.system.NativeStart.main (Native Method)

我想这个错误可能与我的一些依赖的版本有关。

这里的依赖性在顶级gradle这个：

dependencies { 
    classpath 'com.android.tools.build:gradle:2.1.3' 
    classpath 'com.google.gms:google-services:1.3.0-beta1' 
}

而且我的应用程序的gradle产出：

dependencies { 
    compile fileTree(dir: 'libs', include: ['*.jar']) 
    testCompile 'junit:junit:4.12' 
    compile 'com.android.support:appcompat-v7:24.2.1' 
    compile 'com.google.firebase:firebase-ads:9.4.0' 
    compile 'com.google.android.gms:play-services:9.6.0' 
}

任何提示将是有益的！提前致谢！

来源

2017-08-13 janlindso