public class FragmentBackStackChangeListener implements FragmentManager.OnBackStackChangedListener {

    private FragmentManager fragmentManager;
    private int lastBackStackEntryCount;

    public FragmentBackStackChangeListener(FragmentManager fragmentManager) {
        this.fragmentManager = fragmentManager;
        lastBackStackEntryCount = fragmentManager.getBackStackEntryCount();
    }

    @Override
    public void onBackStackChanged() {
        int currentBackStackEntryCount = fragmentManager.getBackStackEntryCount();
        if (currentBackStackEntryCount > 0) {
            Fragment parentFragment = getParentFragment(currentBackStackEntryCount);
            if (parentFragment != null) {
                if (wasPushed(currentBackStackEntryCount)) {
                    parentFragment.onPause();
                } else if (wasPopped(currentBackStackEntryCount)) {
                    parentFragment.onResume();
                }
            }
        }

        lastBackStackEntryCount = currentBackStackEntryCount;
    }

    private boolean wasPushed(int backStackEntryCount) {
        return lastBackStackEntryCount < backStackEntryCount;
    }

    private boolean wasPopped(int backStackEntryCount) {
        return lastBackStackEntryCount > backStackEntryCount;
    }

    private Fragment getParentFragment(int currentBackStackEntryCount) {
        FragmentManager.BackStackEntry backStackEntryAt = fragmentManager.getBackStackEntryAt(currentBackStackEntryCount - 1);
        return fragmentManager.findFragmentByTag(backStackEntryAt.getName());
    }
}