android - 将接口(interface)回调添加到 Bundle 后出现 BadParcelableException(非常罕见且随机发生)？

Question

我在尝试从 Bundle 中检索时看到(不经常 - 很少 = cca 1/1000 次)BadParcelableException。

有人知道为什么会这样吗？我认为它应该总是发生，或者永远不会发生，而不是随机发生。这是我的代码:

1. 我正在放入 Bundle 中的 Parcelable 对象:

   public interface ButtonPressedCallback extends Parcelable {
       public void onButtonPressed ();
   }
   

2. 这就是我把它放在 Bundle 中的方式

   bundle.putString(MyFragment.TITLE, title);
   bundle.putParcelable(MyFragment.CALLBACK , callback);
   

3. 这就是我检索它的方式(这里它崩溃了)

   public class MyFragment extends Fragment {    
       private String title;
       private ButtonPressedCallback callback;
   
       public static final String TITLE = "TITLE";
       public static final String CALLBACK = "CALLBACK";
   
       @Override
       public void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
   
           Bundle b = getArguments();
   
           title = getArguments().getString(TITLE); // it crashes here
           callback = b.getParcelable(CALLBACK );
           ...
      }
   

它在检索普通字符串 TITLE 时神秘地在线崩溃(奇怪....)，但我 100% 确定那条线没问题，它实际上在下面崩溃了——因为它是在我将接口(interface)添加到 Bundle 时开始的

这里是堆栈跟踪:

Caused by: android.os.BadParcelableException: 
  at android.os.Parcel.readParcelableCreator (Parcel.java:2875)
  at android.os.Parcel.readParcelable (Parcel.java:2797)
  at android.os.Parcel.readValue (Parcel.java:2700)
  at android.os.Parcel.readArrayMapInternal (Parcel.java:3067)
  at android.os.BaseBundle.unparcel (BaseBundle.java:257)
  at android.os.BaseBundle.getString (BaseBundle.java:1086)
       at sk.myapp.intro.MyFragment.onCreate (MyFragment.java:42)
  at android.support.v4.app.Fragment.performCreate (Fragment.java:2414)
  at android.support.v4.app.FragmentManagerImpl.moveToState (FragmentManagerImpl.java:1418)
  at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState (FragmentManagerImpl.java:1784)
  at android.support.v4.app.FragmentManagerImpl.moveToState (FragmentManagerImpl.java:1852)
  at android.support.v4.app.FragmentManagerImpl.dispatchStateChange (FragmentManagerImpl.java:3269)
  at android.support.v4.app.FragmentManagerImpl.dispatchCreate (FragmentManagerImpl.java:3223)
  at android.support.v4.app.FragmentController.dispatchCreate (FragmentController.java:190)
  at android.support.v4.app.FragmentActivity.onCreate (FragmentActivity.java:369)
       at sk.myapp.intro.MainActivity.onCreate (MainActivity.java:46)
  at android.app.Activity.performCreate (Activity.java:7183)
  at android.app.Instrumentation.callActivityOnCreate (Instrumentation.java:1221)
  at android.app.ActivityThread.performLaunchActivity (ActivityThread.java:2910)
  at android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:3032)
  at android.app.ActivityThread.-wrap11 (Unknown Source)
  at android.app.ActivityThread$H.handleMessage (ActivityThread.java:1696)
  at android.os.Handler.dispatchMessage (Handler.java:105)
  at android.os.Looper.loop (Looper.java:164)
  at android.app.ActivityThread.main (ActivityThread.java:6942)
  at java.lang.reflect.Method.invoke (Method.java)
  at com.android.internal.os.Zygote$MethodAndArgsCaller.run (Zygote.java:327)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1374)

Answer 1

写这篇文章是因为我无法在评论中提供示例，

@SuppressLint("ParcelCreator")
public class MainActivity extends AppCompatActivity implements CallbackInterface{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Bundle bundle = new Bundle();
        bundle.putParcelable("CALLBACK",this); // <---

    }

    @Override
    public void demoCallback() {

    }

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {

    }
}

因为我正在传递 this，所以当我的 Activity 包含大量成员变量(> 1MB)时它可能会崩溃