RecyclerView + FirebaseRecyclerAdapter + Spinner在活动中过滤

Question

我有一个带有 FirebaseRecyclerAdapter 的回收者视图和一个微调器。

它在活动中显示了一个对象列表，用于检索文件数据库。 我的问题是：当用户在微调器中选择值时，在回收器视图中使用过滤器的哪种更好的方法？ 在下面的微调器中选择一个值时，没有任何反应......不更新RecyclerView

例如：当用户选择＆＃39; Brazil＆＃39;在微调器中，调用一个现有的查询 query = databaseReference.child("People").orderByChild("country").equalTo("Brazil").getRef(); //我还不知道这是否有效。

    query =  databaseReference.child("People").getRef();
    mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);
    spinnerFilter = (Spinner) findViewById(R.id.spinFilter);

  

// - SPINNER EVENT SELECT -

AdapterView.OnItemSelectedListener selectedListener = new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> spinner, View container, int position, long id)
            {
                if(id == 0)
                {
                    query =  databaseReference.child("PeopleList").orderByChild("country").equalTo("Canada").getRef();
                }else
                if(id == 1)
                {
                    query =  databaseReference.child("PeopleList").orderByChild("country").equalTo("Brazil").getRef();
                }else
                if(id == 2)
                {
                    query =  databaseReference.child("PeopleList").orderByChild("country").equalTo("EUA").getRef();
                }
            }

            @Override
            public void onNothingSelected(AdapterView<?> arg0) {
                query =  databaseReference.child("PeopleList").getRef();
            }
        }; 
          spinnerFilter.setOnItemSelectedListener(selectedListener);

  

// --- RECYCLER VIEW ----

    if (mRecyclerView != null) {
        mRecyclerView.setHasFixedSize(true);
    }
    gLayoutManager= new GridLayoutManager(this, 2);
    mRecyclerView.setLayoutManager(gLayoutManager);
    FirebaseRecyclerAdapter<People, PeopleListViewHolder> adapter = new FirebaseRecyclerAdapter<People, PeopleListViewHolder>
            (
                    People.class,
                    R.layout.layout_people_item,
                    PeopleListViewHolder.class,
                    query
            )
    {
        @Override
        protected void populateViewHolder(PeopleListViewHolder viewHolder, People model, int position)
        {
            viewHolder.tvName.setText(model.getName());
    Picasso.with(PeopleListActivity.this).load(model.getUrlThumbnail()).into(viewHolder.thumbnail);

        }
    };
    mRecyclerView.setAdapter(adapter);

我在这里检查了很多链接但没有成功：

https://stackoverflow.com/questions/39076702/filtering-data-before-populating-view-from-firebaserecycleradapter?rq=1
https://github.com/firebase/FirebaseUI-Android/issues/15
https://groups.google.com/forum/#!topic/firebase-talk/O1kJ4VLUg10
https://github.com/firebase/FirebaseUI-Android/issues/15

非常感谢能帮助我。