BadParcelableException - BroadcastReceiver意图崩溃

Question

这个错误似乎偶尔会发生,这很奇怪.它通常很好,但偶尔会爬起来.这是我的代码,它位于BroadcastReceiver中:

public void onReceive(Context context, Intent intent) {
    MyCustomResponseMsg message = new MyCustomResponseMsg((MyMessage) intent.getParcelableExtra(MyMessage.EXTRA_MESSAGE_KEY));

    // do stuff with the message

    setResultCode(Activity.RESULT_OK);
}

以下是例外情况:

01-16 10:05:03.834: ERROR/AndroidRuntime(13533): FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start receiver com.(path-to-broadcast-receiver).MyReqReceiver:   
android.os.BadParcelableException: ClassNotFoundException when unmarshalling:  com.(path-to-my-message).MyMessage
at android.app.ActivityThread.handleReceiver(ActivityThread.java:1805)
at android.app.ActivityThread.access$2400(ActivityThread.java:117)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:981)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3683)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.os.BadParcelableException: ClassNotFoundException when unmarshalling:     com.(path-to-my-message).MyMessage
at android.os.Parcel.readParcelable(Parcel.java:1958)
at android.os.Parcel.readValue(Parcel.java:1846)
at android.os.Parcel.readMapInternal(Parcel.java:2083)
at android.os.Bundle.unparcel(Bundle.java:208)
at android.os.Bundle.getParcelable(Bundle.java:1100)
at android.content.Intent.getParcelableExtra(Intent.java:3437)
at     com.(path).MyReceiver.onReceive(My    ReqReceiver.java:23)
at android.app.ActivityThread.handleReceiver(ActivityThread.java:1794)
... 10 more

该错误似乎发生在getParcelableExtra行上."MyMessage"类(显然在我自己的项目中名称不同)确实存在; 它包含在一个库中.它大部分时间都可以工作,但有时我每次收到广播时都会崩溃.

我意识到这并不是很重要,但我只是想看看是否有任何我可以在接收器中采取不同的方式来捕获它,以便它不会导致崩溃.或者如果它肯定是发送广播的一面,那么如果需要我可以专注于它.但在此期间,我只是想确保为我的目的正确设置.我已经检查过这次崩溃的其他类似帖子,但我似乎无法找到任何涉及从BroadcastReceiver中的意图获得这种特定类型的parcelable.

在此先感谢任何指导!

编辑 如果需要,以下是MyMessage的构造函数:

public MyMessage(Parcel in) {
    field1 = in.readInt();
    field2 = in.readString();
    field3 = in.readString();
}

Answer 1

通过ClassLoader在解组自定义Parcelable类的过程中设置正确的解决方案,我已经看到了这个问题的大部分案例.

仔细看看你的MyMessage构造函数,特别是你如何获得ClassLoader:

private MyMessage(Parcel in) {
    //...
    //causes ClassNotFoundException
    this.field=in.readParcelable(null); 
    //causes ClassNotFoundException, in fact it's equivalent to previous
    this.field=in.readParcelable(ClassLoader.getSystemClassLoader()); 

    //this one should work
    this.field=in.readParcelable(getClass().getClassLoader());
}

更多细节可以在这个问题中找到.

更新:另外,尝试设置正确ClassLoader的Bundle包含在你的Intent:

public void onReceive(Context context, Intent intent) {
    Bundle extras=intent.getExtras();
    extras.setClassLoader(getClass().getClassLoader());
    MyCustomResponseMsg message = new MyCustomResponseMsg((MyMessage) extras.getParcelable(MyMessage.EXTRA_MESSAGE_KEY));
    //...
}