当数据插入Firebase数据库时，我当前的活动会重新打开多次

Question

我正在将Firebase数据库用于我的聊天应用程序。我想同时在fire base数据库的三个位置插入数据，并且要获取数据，我添加了addValueEventListener，因为我想在每次数据更改时都在数据中，但是此Listener多次重新打开我当前的聊天活动，请指导我可以我会解决此问题。谢谢* 这是我获取数据的代码：

 private void getAllMessages(String location) {
    DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference().child("conversations");
    rootRef.child(location).addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            get_message_list = new ArrayList<>();

            for (DataSnapshot ds : dataSnapshot.getChildren()) {

                UserChat userChat = ds.getValue(UserChat.class);
                UserChat userChat1 = new UserChat();
                String f_id = userChat.fromID;
                String content = userChat.content;
                String to_id = userChat.toID;
                String type = userChat.type;
                int timestamp1 = userChat.timestamp;

                userChat1.setContent(content);
                userChat1.setFromID(f_id);
                userChat1.setToID(to_id);
                userChat1.setType(type);
                get_message_list.add(userChat1);
            }

            Log.e("CHECK_RUN", " COUNT");
            if (adaper == null) {
                adaper = new GetChatAdapter(ChatActivity.this, get_message_list);
                get_chat_recycler_view.setLayoutManager(new LinearLayoutManager(ChatActivity.this, LinearLayoutManager.VERTICAL, false));
                get_chat_recycler_view.setAdapter(adaper);
                get_chat_recycler_view.scrollToPosition(get_message_list.size() - 1);
                adaper.notifyDataSetChanged();
            } else {
                adaper.notifyDataSetChanged();
            }

        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });

}