过滤查询以填充 FirebaseRecyclerAdapter

Question

目前还不清楚如何使用自定义查询填充 FirebaseRecyclerAdapter。

1. 定义引用。这里：DatabaseReference ref = mDatabase.getReference().child("users");

2. 发送给适配器initAdapter(ref);

3. 定义查询并设置侦听器。对吗？

   mAdapter = new FirebaseRecyclerAdapter<User, UserHolder>(User.class,  R.layout.user_row_layout, UserHolder.class, ref) {
   
           @Override
           protected void populateViewHolder(final UserHolder viewHolder, final User model, int position) {
   
               Query query = ref.orderByChild("group").equalTo(uid);
               query.addChildEventListener(new ChildEventListener() {
                   @Override
                   public void onChildAdded(DataSnapshot dataSnapshot, String s) {
                       viewHolder.setName(model.getName());
                       viewHolder.setStatus(getStatus(model.getStatus()));
                   }
   
                   // ...
               };
   

仍在显示来自用户的所有数据。只需要根据 uid 进行过滤。有什么线索吗？

Answer 1

对于那些可能像我一样over-complicated或在晚上工作的人，这里是解决方案：

mAdapter = new FirebaseRecyclerAdapter<User, UserHolder>(
               User.class,  
               R.layout.user_row_layout, 
               UserHolder.class,
               ref.orderByChild("group").equalTo(uid)
) {
    @Override
    protected void populateViewHolder(final UserHolder viewHolder, final User model, int position) {

                viewHolder.setName(model.getName());
                viewHolder.setStatus(getStatus(model.getStatus()));
            }

            // ...
        };

超！

Answer 2

一个简单的例子，我展示了所有用户的排名列表：

FirebaseRecyclerAdapter<UserData,RankListViewHolder> adapter = new FirebaseRecyclerAdapter<UserData, RankListViewHolder>
                (
           UserData.class,
           R.layout.rank_item,
           RankListViewHolder.class,
           userRef.child("users").getRef() //--Set here your query
                )
        {
            @Override
protected void populateViewHolder(RankListViewHolder viewHolder, UserData model, int position)
            {
                viewHolder.tvPos.setText(""+position+"º");
                viewHolder.userId = model.getId();
            }
        };