Work with fragment problem. about androidexpandingviewlibrary HOT 2 CLOSED

`@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        rootView = inflater.inflate(R.layout.fragment_movies, container, false);
        return rootView;
    }
    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        mExpandingList = (ExpandingList) rootView.findViewById(R.id.expanding_list_main);
        createItems();
    }`