I’m occasionally seeing exceptions that I do not really understand. Here’s what I do: I have an interface
public interface IResultProcessor<T> extends Serializable {
void processResult(T result);
}
, instances of which I use in this class:
public class ConfirmationDialogFragment extends DialogFragment {
public static void executeAfterConfirmation(FragmentActivity activity, IResultProcessor<Void> runnable,
String title, String message, int icon, String positiveButtonText, String negativeButtonText) {
ConfirmationDialogFragment fragment = new ConfirmationDialogFragment();
Bundle args = new Bundle();
args.putSerializable(ARG_RUNNABLE, runnable);
fragment.setArguments(args);
fragment.show(activity.getSupportFragmentManager(), "dialog");
}
}
In the onCreateDialog() method, I receive the IProcessResult instance and execute it if the user has confirmed.
I then use all this in an activity as follows:
@SuppressWarnings("serial")
IResultProcessor<Void> processor = new IResultProcessor<Void>() {
@Override
public void processResult(Void result) {
new AsyncTask<Void, Void, String>() {
@Override
protected String doInBackground(Void... params) {
DBFacade.INSTANCE.saveSession(session);
return "My msg...";
}
@Override
protected void onPostExecute(String result) {
Toast.makeText(MyActivity.this, result, Toast.LENGTH_LONG).show();
}
}.execute((Void) null);
}
};
ConfirmationDialogFragment.executeAfterConfirmation(this, processor, "Save session?", "dialog text", R.drawable.ic_dialog_info, "Save", "Don't save");
The session object saved in the AsyncTask does not implement Serializable (but Parcelable because of other reasons) and is a field of MyActivity.
And here’s the exception I’m seeing:
java.lang.RuntimeException: Parcelable encountered IOException writing serializable object (name = MyActivity$3)
at android.os.Parcel.writeSerializable(Parcel.java:1279)
at android.os.Parcel.writeValue(Parcel.java:1233)
at android.os.Parcel.writeMapInternal(Parcel.java:591)
at android.os.Bundle.writeToParcel(Bundle.java:1619)
at android.os.Parcel.writeBundle(Parcel.java:605)
at android.support.v4.app.FragmentState.writeToParcel(Fragment.java:132)
at android.os.Parcel.writeTypedArray(Parcel.java:1102)
at android.support.v4.app.FragmentManagerState.writeToParcel(FragmentManager.java:357)
at android.os.Parcel.writeParcelable(Parcel.java:1254)
at android.os.Parcel.writeValue(Parcel.java:1173)
at android.os.Parcel.writeMapInternal(Parcel.java:591)
at android.os.Bundle.writeToParcel(Bundle.java:1619)
at android.os.Parcel.writeBundle(Parcel.java:605)
at android.app.ActivityManagerProxy.activityStopped(ActivityManagerNative.java:2078)
at android.app.ActivityThread$StopInfo.run(ActivityThread.java:2874)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.io.NotSerializableException: MyActivity
at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1364)
at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1671)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1517)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1481)
at java.io.ObjectOutputStream.writeFieldValues(ObjectOutputStream.java:979)
at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:368)
at java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1074)
at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1404)
at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1671)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1517)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1481)
at android.os.Parcel.writeSerializable(Parcel.java:1274)
... 23 more
java.io.NotSerializableException: MyActivity
at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1364)
at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1671)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1517)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1481)
at java.io.ObjectOutputStream.writeFieldValues(ObjectOutputStream.java:979)
at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:368)
at java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1074)
at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1404)
at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1671)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1517)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1481)
at android.os.Parcel.writeSerializable(Parcel.java:1274)
at android.os.Parcel.writeValue(Parcel.java:1233)
at android.os.Parcel.writeMapInternal(Parcel.java:591)
at android.os.Bundle.writeToParcel(Bundle.java:1619)
at android.os.Parcel.writeBundle(Parcel.java:605)
at android.support.v4.app.FragmentState.writeToParcel(Fragment.java:132)
at android.os.Parcel.writeTypedArray(Parcel.java:1102)
at android.support.v4.app.FragmentManagerState.writeToParcel(FragmentManager.java:357)
at android.os.Parcel.writeParcelable(Parcel.java:1254)
at android.os.Parcel.writeValue(Parcel.java:1173)
at android.os.Parcel.writeMapInternal(Parcel.java:591)
at android.os.Bundle.writeToParcel(Bundle.java:1619)
at android.os.Parcel.writeBundle(Parcel.java:605)
at android.app.ActivityManagerProxy.activityStopped(ActivityManagerNative.java:2078)
at android.app.ActivityThread$StopInfo.run(ActivityThread.java:2874)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
Any idea what’s going on here?
I haven’t totally understood, but apparently solved the issue. The exceptions were thrown when the activity was destroyed because another one came into the foreground. I solved it by converting the anonymous IResultProcessor class into a static inner class of my activity.