显示来自Firebase的特定父级和子级

Question

我目前正在使用管理员用户使用我的论坛应用程序。 是否可以在RecyclerView中显示不同的父级及其子级？

在我目前的代码中，我使用了switch但它只显示了最后一个开关。 这是我的代码

protected void onStart() {
    super.onStart();

mDatabaseG1S1 = FirebaseDatabase.getInstance().getReference().child("Grade1Section1");
mDatabaseG1S2 = FirebaseDatabase.getInstance().getReference().child("Grade1Section2");
mDatabase = FirebaseDatabase.getInstance().getReference().child("Grade1Section3");
int ctr = 0;

mAuth.addAuthStateListener(mAuthListener);
switch(ctr)
    {case 0: FirebaseRecyclerAdapter<Blog, BlogViewHolder> firebaseRecyclerAdapter
                = new FirebaseRecyclerAdapter<Blog, BlogViewHolder>(
                Blog.class,
                R.layout.outer_row,
                BlogViewHolder.class,
                mDatabase)
        {
         @Override
         protected void populateViewHolder(final BlogViewHolder viewHolder, final Blog model, final int position) {
         viewHolder.setTitle(model.getTitle());
         viewHolder.setDesc(model.getDesc());
         viewHolder.setUsername(model.getUsername());
         }
         };
        mBlogList.setAdapter(firebaseRecyclerAdapter);

    }
    switch(ctr)
    {
        case 0: FirebaseRecyclerAdapter<Blog, BlogViewHolder> firebaseRecyclerAdapter
                = new FirebaseRecyclerAdapter<Blog, BlogViewHolder>(
                Blog.class,
                R.layout.outer_row,
                BlogViewHolder.class,
                mDatabaseG1S1 )
        {
        @Override
        protected void populateViewHolder(final BlogViewHolder viewHolder, final Blog model, final int position) {
        viewHolder.setTitle(model.getTitle());
        viewHolder.setDesc(model.getDesc());
        viewHolder.setUsername(model.getUsername());
            }
        };
        mBlogList.setAdapter(firebaseRecyclerAdapter);        
    }

    switch(ctr)
    {
        case 0: FirebaseRecyclerAdapter<Blog, BlogViewHolder> firebaseRecyclerAdapter
                = new FirebaseRecyclerAdapter<Blog, BlogViewHolder>(
                Blog.class,
                R.layout.outer_row,
                BlogViewHolder.class,
                mDatabaseG1S2 )
        {
        @Override
        protected void populateViewHolder(final BlogViewHolder viewHolder, final Blog model, final int position) {
        viewHolder.setTitle(model.getTitle());
        viewHolder.setDesc(model.getDesc());
        viewHolder.setUsername(model.getUsername());
        }
        };
            mBlogList.setAdapter(firebaseRecyclerAdapter);   
    }
  }

它只显示最后一个开关，即Grade1Section1父项及其子项

我想在RecyclerView中显示这些父母的子女。