Question

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

定义参考。这里：DatabaseReference ref = mDatabase.getReference().child("users");
将其发送到适配器initAdapter（ref）;

定义查询并设置侦听器。是不是？

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()));
                }

                // ...
            };

仍然显示来自用户的所有数据。只需要根据uid进行过滤。有线索吗？

Answer 1

对于那些可能试图让事情变得过于复杂或者晚上工作的人来说，这里有解决方案：

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()));
            }

            // ...
        };

晁！

Answer 2

一个简单示例，其中显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();
            }
        };

过滤查询以填充FirebaseRecyclerAdapter

2 个答案: