android Fragment使用RecyclerView

public class DashboardFragment extends Fragment {

    private DashboardViewModel dashboardViewModel;

    public View onCreateView(@NonNull LayoutInflater inflater,
                             ViewGroup container, Bundle savedInstanceState) {
        View view =inflater.inflate(R.layout.fragment_dashboard,container,false);
        return view;
        /*
        /*
        dashboardViewModel =
                ViewModelProviders.of(this).get(DashboardViewModel.class);
        View root = inflater.inflate(R.layout.fragment_dashboard, container, false);
        final TextView textView = root.findViewById(R.id.text_dashboard);
        dashboardViewModel.getText().observe(getViewLifecycleOwner(), new Observer<String>() {
            @Override
            public void onChanged(@Nullable String s) {
                textView.setText(s);
            }
        });
        return root;
         */
    }
}

import com.example.mytest2.R;

public class NotificationsFragment extends Fragment {

    //private NotificationsViewModel notificationsViewModel;
    private RecyclerView mRecyclerView;
    private ArticleAdapter mArticleAdapter;
    public View onCreateView(@NonNull LayoutInflater inflater,
                             ViewGroup container, Bundle savedInstanceState) {

        View view =inflater.inflate(R.layout.fragment_notifications,container,false);

        mRecyclerView = (RecyclerView) view.findViewById(R.id.rv_list);
        LinearLayoutManager llm = new LinearLayoutManager(getActivity());//(this);
        llm.setOrientation(LinearLayoutManager.VERTICAL);
        mRecyclerView.setLayoutManager(llm);
        mArticleAdapter=new ArticleAdapter(/*this,*/llm);
        mRecyclerView.setAdapter(mArticleAdapter);

        return view;

        /*
        notificationsViewModel =
                ViewModelProviders.of(this).get(NotificationsViewModel.class);
        View root = inflater.inflate(R.layout.fragment_notifications, container, false);
        final TextView textView = root.findViewById(R.id.text_notifications);
        notificationsViewModel.getText().observe(getViewLifecycleOwner(), new Observer<String>() {
            @Override
            public void onChanged(@Nullable String s) {
                textView.setText(s);
            }
        });
        return root;
*/

    }
}