FragmentQuote.java

public class FragmentQuote extends LifecycleFragment{

  private QuoteViewModel quoteViewModel; //data model
  private SwipeRefreshLayout swipeRefreshLayout; //swipe to refresh data
  private RecyclerView recyclerView;
  private AdapterQuotes adapterQuotes;

  @Nullable
  @Override
  public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_quote,container,false);
    recyclerView = (RecyclerView) view.findViewById(R.id.recycler_view_quotes);
    swipeRefreshLayout = (SwipeRefreshLayout) view.findViewById(R.id.swipe_to_refresh);
    swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
      @Override
      public void onRefresh() {
      //changes will be reflected automatically, thanks to LiveData
      quoteViewModel.refreshData();
      }
    });

    //set up recycler view
    adapterQuotes = new AdapterQuotes(getContext());
    recyclerView.setAdapter(adapterQuotes);
    recyclerView.setLayoutManager(new WrapContentLinearLayoutManager(getContext()));

    return view;
  }

  @Override
  public void onActivityCreated(@Nullable Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);

    //create dataModel object
    //remember, doesn’t matter how many times this method called, same object will be returned
    quoteViewModel = ViewModelProviders.of(this).get(QuoteViewModel.class);
    quoteViewModel.init( getArguments().getString("category"),getArguments().getInt("count"));

    //observer data for any changes
    //no need to unregister this receiver anywhere, lifecycle aware components, duh
    quoteViewModel.getQuote().observe(this, new Observer<List<Quote>>() {
      @Override
      public void onChanged(@NonNull List<Quote> quote) {
        if(quote.size()==0) return;;

        adapterQuotes.insertItems(quote);
        recyclerView.scrollToPosition(0);

        if(swipeRefreshLayout.isRefreshing()){
        swipeRefreshLayout.setRefreshing(false);
        }
      }
    });
}