Android 4.2: back stack behaviour with nested fragments

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This solution may be better version of @Sean answer:

@Override
public void onBackPressed() {
    // if there is a fragment and the back stack of this fragment is not empty,
    // then emulate 'onBackPressed' behaviour, because in default, it is not working
    FragmentManager fm = getSupportFragmentManager();
    for (Fragment frag : fm.getFragments()) {
        if (frag.isVisible()) {
            FragmentManager childFm = frag.getChildFragmentManager();
            if (childFm.getBackStackEntryCount() > 0) {
                childFm.popBackStack();
                return;
            }
        }
    }
    super.onBackPressed();
}

Again, I prepared this solution based on @Sean answer above.

As @AZ13 said, this solution is only feasible in one level child fragments situations. In multiple level fragments case, works become a little complex, so I recommend that try this solution only the feasible case I have said. =)

Note: Since getFragments method is now a private method, this solution will not work. You can check comments for a link which suggests a solution about this situation.

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