Firebase从多个节点检索数据

Question

如何检索用户的所有出版物＆＃39; 04a86MjHKnUyPT173jyzgoYcVyA3＆＃39;并出版他的朋友

   mDatabase = FirebaseDatabase.getInstance().getReference().child("Publication").child(iduser);
            mDatabase.keepSynced(true);


            firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<AdapterPublication, CardViewHolder>(

                    AdapterPublication.class,
                    R.layout.card_view,
                    CardViewHolder.class,
                    mDatabase )