elsennov

private void addTagToChildFragmentTagsMap(String childFragmentTag) {
    List<String> childFragmentTags = CHILD_FRAGMENT_TAGS_MAP.get(mParentId);
    if (childFragmentTags == null) {
        List<String> initialChildFragmentTags = new ArrayList<>();
        initialChildFragmentTags.add(childFragmentTag);
        CHILD_FRAGMENT_TAGS_MAP.put(mParentId, initialChildFragmentTags);
    } else {
        childFragmentTags.add(childFragmentTag);
    }
}

elsennov

private void removeAllChildFragments() {
    List<String> childFragmentTags = CHILD_FRAGMENT_TAGS_MAP.get(mParentId);
    if (childFragmentTags != null && !childFragmentTags.isEmpty()) {
        List<Fragment> childFragments = getChildFragmentManager().getFragments();
        if (childFragments != null && !childFragments.isEmpty()) {
            FragmentTransaction fragmentTransaction = getChildFragmentManager().beginTransaction();
            for (Fragment childFragment : childFragments) {
                if (childFragment != null) {
                    if (childFragmentTags.contains(childFragment.getTag())) {
                        fragmentTransaction.remove(childFragment);