Auto back management for fragments with child fragments up to 1 level depth

MainActivity.java

 @Override
    public void onBackPressed() {
        FragmentManager fm = getSupportFragmentManager();
        for (Fragment frag : fm.getFragments()) {
            if (frag.isVisible()) {
                FragmentManager childFm = frag.getChildFragmentManager();
                if (childFm.getBackStackEntryCount() > 0) {
                    for (Fragment childfragnested: childFm.getFragments()) {
                        FragmentManager childFmNestManager = childfragnested.getFragmentManager();
                        if(childfragnested.isVisible()) {
                            childFmNestManager.popBackStack();
                            return;
                        }
                    }
                }
            }
        }
        super.onBackPressed();

    }