ReyclerView无法正常工作 [英] ReyclerView isn't working

问题描述

我正在尝试在recyclerview上显示我的模型的列表.但由于某种原因，它什么也没显示.我从FirebaseDatabase获取列表项，并将所有数据保存在"videoList"上.然后，我想提出我已收到的数据，但什么也没显示.

I'm trying to show list of my model on recyclerview. but for some reason it doesnt show anything. I'm getting my list items from FirebaseDatabase and save all the data on "videoList". Then i want to presents the data that i have received, but it doesnt show anything.

请告诉我我在做错什么.

Please tell me what i'm doing wrong.

  public class MyPlayListFragment extends Fragment {
    private FirebaseDatabase refToVideos;
    private FirebaseUser currentUser;
    private ArrayList<Video> videosList;
    private VideoViewAdapter adapter;
    private RecyclerView rvVideos;


public MyPlayListFragment() {
    // Required empty public constructor
}


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View v = inflater.inflate(R.layout.fragment_my_play_list, container, false);
    rvVideos = (RecyclerView)v.findViewById(R.id.rvVideos);

    return v;
}

@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    videosList = new ArrayList<>();
    refToVideos = FirebaseDatabase.getInstance();
    currentUser = FirebaseAuth.getInstance().getCurrentUser();

    refToVideos.getReference(Params.VIDEOS).addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            for (DataSnapshot snapshot : dataSnapshot.getChildren()){
                videosList.add(snapshot.getValue(Video.class));
            }
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });

    adapter = new VideoViewAdapter(getContext(),videosList);
    rvVideos.setLayoutManager(new LinearLayoutManager(getContext()));
    rvVideos.setAdapter(adapter);

}




public class VideoViewAdapter extends RecyclerView.Adapter<VideoViewHolder>{
  private LayoutInflater inflater;
  private Context context;
  private ArrayList<Video> data;

  public VideoViewAdapter( Context context, ArrayList<Video> data) {
      this.context = context;
      this.inflater = LayoutInflater.from(context);
      this.data = data;
  }

  @Override
  public VideoViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
      View v = inflater.inflate(R.layout.video_item,parent,false);
      return new VideoViewHolder(v);
  }

  @Override
  public void onBindViewHolder(VideoViewHolder holder, int position) {
      Video video = data.get(position);
      holder.tvTitleVideo.setText(video.getVideoName());
      holder.tvLikes.setText(String.valueOf(video.getLikes()));
      holder.tvViews.setText(String.valueOf(video.getViews()));
      Uri uri = Uri.parse(video.getVideoURL());
      holder.videoViewUser.setVideoURI(uri);
      holder.videoViewUser.start();

  }

  @Override
  public int getItemCount() {
      return 0;
  }
}

public  class VideoViewHolder extends RecyclerView.ViewHolder{
    private TextView tvTitleVideo,tvLikes,tvViews;
    private VideoView videoViewUser;

    public VideoViewHolder(View itemView) {
        super(itemView);
        tvTitleVideo = (TextView) itemView.findViewById(R.id.videoTitle);
        tvLikes = (TextView)itemView.findViewById(R.id.tvLikes);
        tvViews = (TextView)itemView.findViewById(R.id.tvViews);
        videoViewUser = (VideoView)itemView.findViewById(R.id.videoViewUser);

      }
    }

 }

推荐答案

您应该return getItemCount()

使用此功能:

@Override
public int getItemCount() {
    return data.size();
}

代替此:

@Override
public int getItemCount() {
    return 0;
}

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