Fragments debug print

private static void printFragments(int level, FragmentManager fm) {
    if (fm != null) {
        List<Fragment> fragList = fm.getFragments();
        if (fragList != null && fragList.size() > 0) {
            String indent = level > 0 ? StringUtils.repeat(' ', level) : "";
            for (Fragment frag : fragList) {
                if (frag == null) {
                    continue;
                }
                Log.d(TAG, indent + frag + " (" + (frag.isVisible() ? "visible)" : "invisible)"));
                printFragments(level + 1, frag.getChildFragmentManager());
            }
        }
    }
}