在片段中使用FirebaseRecyclerAdapter

Question

在我的应用程序中，我正在某个活动中使用FirebaseRecyclerAdapter，并且工作正常，但是当我尝试在一个片段中使用它时，则它在下面无法正常工作，我在其中附加了我的活动代码，其中我的活动正常，并且还附加了我的片段。

在我的活动中效果很好：

<a link='https://codepen.io/cathydutton/pen/ldazc?editors=1010'></a>

但是它不是一个片段：

public class Notification extends AppCompatActivity {


    private RecyclerView mPeopleRV;
    private DatabaseReference mDatabase;
    private FirebaseRecyclerAdapter<News, Notification.NewsViewHolder> mPeopleRVAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {




        mDatabase = FirebaseDatabase.getInstance().getReference().child("XXXX");
        mDatabase.keepSynced(true);
        mPeopleRV = (RecyclerView) findViewById(R.id.myRecycleView);
        DatabaseReference personsRef = FirebaseDatabase.getInstance().getReference().child("XXXX");
        Query personsQuery = personsRef.orderByKey();
        mPeopleRV.hasFixedSize();
        LinearLayoutManager mLayoutManager = new LinearLayoutManager(Notification.this);
        mLayoutManager.setReverseLayout(true);
        mLayoutManager.setStackFromEnd(true);
        mPeopleRV.setLayoutManager(mLayoutManager);
        FirebaseRecyclerOptions personsOptions = new FirebaseRecyclerOptions.Builder<News>().setQuery(personsQuery, News.class).build();
        mPeopleRVAdapter = new FirebaseRecyclerAdapter<News, NewsViewHolder>(personsOptions) {
            @Override
            protected void onBindViewHolder(Notification.NewsViewHolder holder, final int position, final News model) {


                holder.setTitle(model.getName());

            }

            @Override
            public Notification.NewsViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

                View view = LayoutInflater.from(parent.getContext())
                        .inflate(R.layout.news_row, parent, false);

                return new Notification.NewsViewHolder(view);
            }
        };

        mPeopleRV.setAdapter(mPeopleRVAdapter);


    }



    @Override
    public void onStart() {
        super.onStart();
        mPeopleRVAdapter.startListening();
    }

    @Override
    public void onStop() {
        super.onStop();
        mPeopleRVAdapter.stopListening();


    }





    public static class NewsViewHolder extends RecyclerView.ViewHolder {
        View mView;

        public NewsViewHolder(View itemView) {
            super(itemView);
            mView = itemView;
        }


        public void setTitle(String title) {

            String output = title.substring(0, 1).toUpperCase() + title.substring(1);

            TextView post_title = (TextView) mView.findViewById(R.id.post_title);
            post_title.setText(output);
        }


    }