public void showFragmentNoBackStack(String fragmentTag, Object dataForFragment) {
        showFragment(fragmentTag, dataForFragment, false);
}

public void showFragmentAddToBackStack(String fragmentTag, Object dataForFragment) {
        showFragment(fragmentTag, dataForFragment, true);
}

@Override
public void onBackPressed() {
    if (getFragmentManager().getBackStackEntryCount() > 0) {
        getFragmentManager().popBackStack();
    } else {
        super.onBackPressed();
    }
}