Android : Android refresh Recyclerview delayed

I have a simple layout with a recyclerview. In the onCreateView method I set up the Recyclerview:

  @Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment_overview, container, false);
    recyclerView = (RecyclerView) rootView.findViewById(R.id.rv_overview);
    list = new ArrayList<>();
    LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
    layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
    recyclerView.setLayoutManager(layoutManager);

    list = getOverviewList(getActivity());
    adapter = new OverviewRecyclerAdapter(getActivity(), list);
    recyclerView.setAdapter(adapter);
    final Context context = getActivity();
    new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {
            list =getOverviewList(context);
            adapter.notifyDataSetChanged();
        }
    }, 1000);
    return rootView;
}

As you can see the Recyclerview needs to be refreshed a second after the view is creted. I tried to achieve thsi with a Handler. But the code within the Handler does not refresh the Recyclerview. But obviously it should.