Question

我有2个片段，A和B.片段B包含recyclerview，并在加载片段B时填充。但是，当我按下片段B然后我回到片段A时，我尝试再次回到片段B但是没有填充recyclerview。

奇怪的是，在我更改屏幕方向后，它确实会填充。

如何在返回片段B后填充recyclerview？

在片段B的onCreateView中设置适配器：

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState)
{
   recyclerView = (RecyclerView) view.findViewById(R.id.rvPlaylists);
   recyclerView.setHasFixedSize(true);
   layoutManager = new GridLayoutManager(getActivity(),1);
   recyclerView.setLayoutManager(layoutManager);
   PlaylistAdapter adapter = new PlaylistAdapter(savedPlaylists);
   recyclerView.setAdapter(adapter);
}

适配器：

public class PlaylistAdapter extends 
RecyclerView.Adapter<PlaylistAdapter.ViewHolder> 
{
   private Context mContext;
   private ArrayList<Playlist> mPlaylists;
   private LayoutInflater mInflater;

   public PlaylistAdapter(ArrayList<Playlist> playlists)
   {
       mPlaylists = playlists;
   }

   @Override
   public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
   {
       View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.playlist_recyclerview_item, parent, false);
       return new ViewHolder(v);
   }

   @Override
   public void onBindViewHolder(ViewHolder holder, int position)
   {
       Playlist currentPlaylist = mPlaylists.get(position);
       holder.tvName.setText(currentPlaylist.getName());
       holder.btnPlayPlaylist.setOnClickListener(new View.OnClickListener(){
           @Override
           public void onClick(View v) {
               Log.d("btn clicked","mlk");
           }
       });
   }

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


   public class ViewHolder extends RecyclerView.ViewHolder
   {
       public TextView tvName;
       public ImageButton btnPlayPlaylist;

       public ViewHolder(View v)
       {
           super(v);
           tvName = (TextView) v.findViewById(R.id.lblPlaylistName);
           btnPlayPlaylist = (ImageButton) v.findViewById(R.id.btnPlayPlaylist);
       }

  }

加载片段B：

public void navigateFromPlaylistFragmentToSavedPlaylistFragment()
{
    getFragmentManager().beginTransaction().replace(R.id.activity_main, new SavedPlaylistFragment()).addToBackStack("navigatefromplaylistfragmenttosavedplaylistfragment")
            .commit();
}

Answer 1

初始化适配器并填充数据后，您没有调用 adapter.notifyDataSetChanged(); 。

Recyclerview仅在方向更改后填充

1 个答案: