IllegalStateException on FragmentManager

Question

My app keeps to report this issue on many Android platforms (4.1, 4.0.4, 2.3.6...). But I could not reproduce this issue on my phone. I have searched for this issue by Google, but the stack trace seems not the same as my.

Does someone know how the issue happening? And how to prevent it? Or how can I reproduce this error? Thank you.

Stack trace:

java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1327)
at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1338)
at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:595)
at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:574)
at android.support.v4.app.FragmentTabHost.onAttachedToWindow(FragmentTabHost.java:278)
at android.view.View.dispatchAttachedToWindow(View.java:12064)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2707)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2714)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2714)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2714)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2714)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1339)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1131)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4611)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
at android.view.Choreographer.doCallbacks(Choreographer.java:555)
at android.view.Choreographer.doFrame(Choreographer.java:525)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4898)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1008)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:775)
at dalvik.system.NativeStart.main(Native Method)

-------------------- Edit --------------------

To Jonathan:

I have two fragments. And only one fragment overwrites the onPause callback, and the codes are as below. And I don't overwrite the other callbacks after onPause. Another callback I overwrite is the onResume callback, the codes are as below too.

Fragment:

@Override
public void onPause() {
    super.onPause();
    if (mView instanceof MyView) {
        MyView my = (MyView) mView;
        my.onPause();
    }
}

@Override
public void onResume() {
    super.onResume();
    if (mView instanceof MyView) {
        MyView my = (MyView) mView;
        my.onResume();
    }
}

MyView:

public void onPause() {
    pause = true;
}

public void onResume() {
    pause = false;
    if (mDialog != null && mDialog.isShowing()) {
        mDialog.dismiss();
        mDialog = null;
    }
}

I also trace the codes of FragmentActivity/FragmentManager, it seems if the onAttachedToWindow() be called before onPostResume(), then the issue will happen. Is it possible that the onAttachedToWindow() be called before onPostResume()?

Answer 1

This problem is caused by committing a fragment after the activity is onPaused.

A simple solution is to use FragmentTransaction.commitAllowingStateLoss() instead of FragmentTransaction.commit()