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PONotSerializableException while saving fragment state
 

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    <p>I'm occasionally seeing exceptions that I do not really understand. Here's what I do: I have an interface</p> <pre><code>public interface IResultProcessor&lt;T&gt; extends Serializable { void processResult(T result); } </code></pre> <p>, instances of which I use in this class:</p> <pre><code>public class ConfirmationDialogFragment extends DialogFragment { public static void executeAfterConfirmation(FragmentActivity activity, IResultProcessor&lt;Void&gt; 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"); } } </code></pre> <p>In the <code>onCreateDialog()</code> method, I receive the <code>IProcessResult</code> instance and execute it if the user has confirmed.</p> <p>I then use all this in an activity as follows:</p> <pre><code>@SuppressWarnings("serial") IResultProcessor&lt;Void&gt; processor = new IResultProcessor&lt;Void&gt;() { @Override public void processResult(Void result) { new AsyncTask&lt;Void, Void, String&gt;() { @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"); </code></pre> <p>The <code>session</code> object saved in the <code>AsyncTask</code> does not implement <code>Serializable</code> (but <code>Parcelable</code> because of other reasons) and is a field of MyActivity.</p> <p>And here's the exception I'm seeing:</p> <pre><code>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) </code></pre> <p>Any idea what's going on here?</p>
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    1. CODo you have an inner class in MyActivity that is not serializable?
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    2. CO@ChuckNorris No... I have an inner class which inherits from BroadCastReceiver, but implements Serializable. I'm also using an anonymous inner class (used in a different method than the one which contains the above code) which indeed is not serializable, but that shouldn't matter!? The class MyActivity itself doesn't implement Serializable, it just inherits from android.support.v4.app.FragmentActivity. Does it have to be serializable?
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    3. COThere is a caused by ... NotSerializableException: MyActivity. Usually this means that it does not implement Serializable: http://docs.oracle.com/javase/6/docs/api/java/io/NotSerializableException.html
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