片段中的Android FirebaseRecyclerAdapter

Question

我正在使用Android Studio提供的類，該選項卡式活動使用ActionBar選項卡與ViewPager。在此活動中，我正嘗試使用Firebase數據庫中的數據初始化CardView的RecyclerView &。

問題：RecyclerView爲空，如下所示。

空屏幕，但滾動工作正常。

，這是我的代碼

public class Produce extends Fragment { 

    private DatabaseReference mDatabase; 
    private FirebaseRecyclerAdapter<ProduceSetting, ProduceViewHolder> mFirebaseAdapter; 
    private RecyclerView mProduceList = null; 
    private View rootView; 

    private Context c; 
    private LinearLayoutManager manager; 

    public Produce() {} 


    @Nullable 
    @Override 
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) { 

     rootView = inflater.inflate(R.layout.fragment_produce, container, false); 
     c = getContext(); 
     mProduceList = (RecyclerView) rootView.findViewById(R.id.produce_recycler_view); 
     manager = new LinearLayoutManager(c); 
     mProduceList.setHasFixedSize(true); 

     mDatabase = FirebaseDatabase.getInstance().getReference().child("Produce"); 

     mFirebaseAdapter = new FirebaseRecyclerAdapter<ProduceSetting, ProduceViewHolder>(

       ProduceSetting.class, R.layout.card_item_produce, ProduceViewHolder.class, mDatabase 

     ) { 
      @Override 
      protected void populateViewHolder(ProduceViewHolder viewHolder, ProduceSetting model, int position) { 
       viewHolder.setName(model.getGameName()); 
       viewHolder.setType(model.getGameType()); 
       viewHolder.setImage(getActivity().getApplicationContext(), model.getImage()); 
      } 
     }; 


     mFirebaseAdapter.registerAdapterDataObserver(new RecyclerView.AdapterDataObserver() { 
      @Override 
      public void onItemRangeInserted(int positionStart, int itemCount) { 
       super.onItemRangeInserted(positionStart, itemCount); 
       int friendlyMessageCount = mFirebaseAdapter.getItemCount(); 
       int lastVisiblePosition = 
         manager.findLastCompletelyVisibleItemPosition(); 
       // If the recycler view is initially being loaded or the 
       // user is at the bottom of the list, scroll to the bottom 
       // of the list to show the newly added message. 
       if (lastVisiblePosition == -1 || 
         (positionStart >= (friendlyMessageCount - 1) && 
           lastVisiblePosition == (positionStart - 1))) { 
        mProduceList.scrollToPosition(positionStart); 
       } 
      } 
     }); 

     mProduceList.setLayoutManager(manager); 
     mProduceList.setAdapter(mFirebaseAdapter); 



     return rootView; 
    } 



    public static class ProduceViewHolder extends RecyclerView.ViewHolder { 

     View mView; 
     public ProduceViewHolder(View itemView) { 
      super(itemView); 
      mView = itemView; 
     } 
     public void setName(String name) { 
      TextView post_name = (TextView) mView.findViewById(R.id.post_name); 
      post_name.setText(name); 
     } 
     public void setType(String type) { 
      TextView post_type = (TextView) mView.findViewById(R.id.post_type); 
      post_type.setText(type); 
     } 
     public void setImage(Context ctx, String image) { 
      ImageView post_image = (ImageView) mView.findViewById(R.id.post_image); 
      Picasso.with(ctx).load(image).into(post_image); 
     } 
    } 
} 

，這裏是我的getter和setter

public class ProduceSetting { 

    private String GameName; 
    private String GameType; 
    private String image; 

    public ProduceSetting(){} 

    public ProduceSetting(String gameName, String gameType, String image) { 
     GameName = gameName; 
     GameType = gameType; 
     this.image = image; 
    } 

    public String getGameName() { 
     return GameName; 
    } 

    public void setGameName(String gameName) { 
     GameName = gameName; 
    } 

    public String getGameType() { 
     return GameType; 
    } 

    public void setGameType(String gameType) { 
     GameType = gameType; 
    } 

    public String getImage() { 
     return image; 
    } 

    public void setImage(String image) { 
     this.image = image; 
    } 

} 

請幫助我。

Answer 1

我錯了。

mDatabase = FirebaseDatabase.getInstance（）。getReference（）。child（「Produce」）;

mDatabase = FirebaseDatabase.getInstance（）。getReference（）。child（「Product」）;