causing a java.IllegalStateException error, No Activity, only when navigating to Fragment for the SECOND time

Question

I am getting a very puzzling bug that I have no idea how to even begin working through.

I have a simple app with one activity, the views are implemented with Fragme

Answer 1

Refer @lopisan answer:

I use his solution for a long time.

BUT I figure out have a better way to do this!

If mChildFragmentManager.mActivity is null, then set mChildFragmentManager to null. When performActivityCreated method.

@Override
void performActivityCreated(Bundle savedInstanceState) {
    if (getFragmentManagerActivity(mChildFragmentManager) == null) {
        setChildFragmentManager(this, null);
    }
    super.performActivityCreated(savedInstanceState);
}


public static FragmentActivity getFragmentManagerActivity(FragmentManager fragmentManager) {
    FragmentManagerImpl fm = (FragmentManagerImpl) fragmentManager;
    return fm.mActivity;
}



private static final Field sChildFragmentManagerField;
static {
    /**
     * BUG : causing a java.IllegalStateException error, No Activity, only
     * when navigating to Fragment for the SECOND time
     * http://stackoverflow.com /questions/15207305/getting-the-error-java-lang-illegalstateexception-activity-has-been-destroyed
     * http://stackoverflow.com/questions/14929907/causing-a-java-illegalstateexception-error-no-activity-only-when-navigating-to
     */
    Field f = null;
    try {
        f = Fragment.class.getDeclaredField("mChildFragmentManager");
        f.setAccessible(true);
    } catch (NoSuchFieldException e) {
        Log.e(TAG, "Error getting mChildFragmentManager field", e);
    }
    sChildFragmentManagerField = f;
}

public static void setChildFragmentManager(Fragment fragment, FragmentManager fragmentManager) {
    if (sChildFragmentManagerField != null) {
        try {
            sChildFragmentManagerField.set(fragment, fragmentManager);
        } catch (Exception e) {
            Log.e(TAG, "Error setting mChildFragmentManager field", e);
        }
    }
}

Answer 2

may your error is android.view.InflateException?

if so,you should inflate Fragment dynamically ,don't use XML layout.

and, you should not target fragment which is defined XML Layout to Fragment Transaction.