YouTube Android Player API在解组时会引发"BadParcelableException ClassNotFoundException:asc"使用新的YouTube版本 [英] YouTube Android Player API throws "BadParcelableException ClassNotFoundException when unmarshalling: asc" with new YouTube version

问题描述

向YouTube Android Player API库工程师提交错误:请参阅android-youtube-api标签

在过去一周半的时间里，我注意到我们的应用中这个奇怪的BadParcelableException一直在不断增加，并将其固定在YouTube在Android上的新版本中.

Over the course of the past week and a half, I've noticed this weird BadParcelableException steadily increasing in our app and have nailed it down to YouTube's new release on android.

如果您的应用正在播放youtube视频，将应用带到后台，强行停止Youtube应用并再次恢复运行，则会发生此崩溃.在YouTube 12.19.56版上可重现崩溃.还在较旧的YouTube版本12.05.21上进行了测试，并且该崩溃不存在.

This crash will occur if your app is playing a youtube video, bringing your app to background, force stopping the Youtube app, and resuming your app again. Crash reproducible on Youtube version 12.19.56. Also tested on an older YouTube version 12.05.21 and the crash was not there.

堆栈跟踪:

main Exception: Unable to start activity ComponentInfo{com.myapp.MainActivity}: 
android.os.BadParcelableException: ClassNotFoundException when unmarshalling: asc 
Stack: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.myapp.MainActivity}: 
android.os.BadParcelableException: ClassNotFoundException when unmarshalling: asc 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2666) 
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2727) 
at android.app.ActivityThread.-wrap12(ActivityThread.java) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1478) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:154) 
at android.app.ActivityThread.main(ActivityThread.java:6121) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779) Caused by: 
android.os.BadParcelableException: ClassNotFoundException when unmarshalling: asc 
at android.os.Parcel.readParcelableCreator(Parcel.java:2536) 
at android.os.Parcel.readParcelable(Parcel.java:2462) 
at android.os.Parcel.readValue(Parcel.java:2365) 
at android.os.Parcel.readSparseArrayInternal(Parcel.java:2813) 
at android.os.Parcel.readSparseArray(Parcel.java:2068) 
at android.os.Parcel.readValue(Parcel.java:2422) 
at android.os.Parcel.readArrayMapInternal(Parcel.java:2732) 
at android.os.BaseBundle.unparcel(BaseBundle.java:269) 
at android.os.Bundle.getSparseParcelableArray(Bundle.java:934) 
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1208) 
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1528) 
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1595) 
at android.support.v4.app.FragmentManagerImpl.dispatchCreate(FragmentManager.java:2893) 
at android.support.v4.app.FragmentController.dispatchCreate(FragmentController.java:190) 
at android.support.v4.app.FragmentActivity.onCreate(FragmentActivity.java:353) 
at android.support.v7.app.AppCompatActivity.onCreate(AppCompatActivity.java:85) 
at com.myapp.BaseActivity.onCreate(BaseActivity.java:36) 
at com.myapp.MainActivity.onCreate(MainActivity.java:190) 
at android.app.Activity.performCreate(Activity.java:6682) 
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118) 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2619) ... 9 more

Caused by: java.lang.ClassNotFoundException: Didn't find class "asc" on path: DexPathList[[zip file "/data/app/com.myapp-naA-_cCrz-w81rqx98ipcQ==/base.apk"],nativeLibraryDirectories=[/data/app/com.myapp-naA-_cCrz-w81rqx98ipcQ==/lib/arm64, /system/lib64, /vendor/lib64]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:93)
at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
... 32 more

更多信息:

@Override
public void onCreate(Bundle savedInstanceState) {
    ...
    super.onCreate(savedInstanceState); // Crashing here MainActivity.java:190
    ...
}

推荐答案

视图状态保存和还原中的问题. YouTube应用程式存在错误，并储存检视状态，其中包含youtube apk中类别asc的实例.因此我们的应用程序无法还原它，因为对该类一无所知.我的解决方案是通过下一个代码阻止YouTubePlayerSupportFragment中YoutubePlayerView的视图状态保存:

The problem in view state saving and restoring. Youtube app have a bug and store view state which contains instance of class asc from youtube apk. So our app can not restore it because known nothing about this class. My solution is preventing view state saving for YoutubePlayerView in YouTubePlayerSupportFragment by next code:

@Override
public void onSaveInstanceState(Bundle bundle) {
    super.onSaveInstanceState(bundle);

    // disable view state saving to prevent saving states from youtube apk which cannot be restored.
    View view = getView();
    if (view instanceof ViewGroup) {
        ViewGroup viewGroup = ((ViewGroup) view);
        for (int i = 0; i < viewGroup.getChildCount(); i++) {
            viewGroup.getChildAt(i).setSaveFromParentEnabled(false);
        }
    }
}

此代码应添加到YouTubePlayerSupportFragment的子类中. 此解决方案不会从捆绑中删除youtube播放器状态.这样youtube播放器将成功恢复.

This code should be added to your subclass of YouTubePlayerSupportFragment. This solution does not remove youtube player state from bundle. So youtube player will be restored successfully.

这篇关于YouTube Android Player API在解组时会引发"BadParcelableException ClassNotFoundException:asc"使用新的YouTube版本的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！