能够发送消息但无法从Firebase接收消息

Question

电话身份验证，登录，获取所有用户和发送消息似乎都很好。但是我无法从其他用户那里收到这些消息。哪里出错了？

ChatActivity：

public class Chat extends AppCompatActivity {
Button addImage;
Button sendButton;
EditText messageArea;
ScrollView scrollView;
TextView name;
FirebaseAuth mAuth;
String MessageSenderId;
String MessageRecieverId;
DatabaseReference rootRef;
RecyclerView userMessageList;
private final List<Messages> messagesList = new ArrayList<>();
private LinearLayoutManager linearLayoutManager;
private MessageAdapter messageAdapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_chat);

    sendButton = (Button) findViewById(R.id.send_message);
    messageArea = (EditText) findViewById(R.id.input_message);
    scrollView = (ScrollView) findViewById(R.id.scrollView);
    addImage = (Button)findViewById(R.id.add_image);
    name = (TextView) findViewById(R.id.name);

    name.setText((getIntent().getStringExtra("name")));

    userMessageList = (RecyclerView)findViewById(R.id.messageList);
    messageAdapter = new MessageAdapter(messagesList);
    linearLayoutManager = new LinearLayoutManager(this);
    userMessageList.setHasFixedSize(true);
    userMessageList.setLayoutManager(linearLayoutManager);
    userMessageList.setAdapter(messageAdapter);

    rootRef = FirebaseDatabase.getInstance().getReference();
    final FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
    mAuth = FirebaseAuth.getInstance();
    MessageSenderId = mAuth.getCurrentUser().getUid();
    MessageRecieverId = getIntent().getExtras().get("visit_user_id").toString();

    fetchMessages();

    sendButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            sendMessage();
        }
    });
}

private void fetchMessages() {
    rootRef.child("Messages").child(MessageSenderId).child(MessageRecieverId)
            .addChildEventListener(new ChildEventListener() {
        @Override
        public void onChildAdded(DataSnapshot dataSnapshot, String s) {
            Messages messages = dataSnapshot.getValue(Messages.class);
            messagesList.add(messages);
            messageAdapter.notifyDataSetChanged();
        }

        @Override
        public void onChildChanged(DataSnapshot dataSnapshot, String s) {

        }

        @Override
        public void onChildRemoved(DataSnapshot dataSnapshot) {

        }

        @Override
        public void onChildMoved(DataSnapshot dataSnapshot, String s) {

        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });
}

private void sendMessage() {
 String messageText = messageArea.getText().toString();
 if (TextUtils.isEmpty(messageText)){
     Toast.makeText(getApplicationContext(),"Can't Send Blank Message",Toast.LENGTH_SHORT).show();
    }
    else {
     String message_sender_ref = "Messages/" + MessageSenderId + "/" + MessageRecieverId;
     String message_reciver_ref = "Messages/" + MessageRecieverId + "/" + MessageSenderId;

     DatabaseReference user_message_key = rootRef.child("Messages").child(MessageSenderId)
                                                 .child(MessageRecieverId).push();
     String message_push_id = user_message_key.getKey();

     Map messageTextBody = new HashMap<>();
     messageTextBody.put("message",messageText);
     messageTextBody.put("seen",false);
     messageTextBody.put("type","text");
     messageTextBody.put("time", ServerValue.TIMESTAMP);
     messageTextBody.put("from", MessageSenderId);


     Map messageBodyDetails = new HashMap();

     messageBodyDetails.put(message_sender_ref + "/" + message_push_id,messageTextBody);
     messageBodyDetails.put(message_reciver_ref + "/" + message_push_id,messageTextBody);

     rootRef.updateChildren(messageBodyDetails, new DatabaseReference.CompletionListener() {
         @Override
         public void onComplete(DatabaseError databaseError, DatabaseReference databaseReference) {
             if (databaseError != null){
                 Log.d("Chat_Log", databaseError.getMessage().toString());
             }
             messageArea.setText("");
         }
     });
 }
}
}   

JSON

 {
"Messages" : {
"8hbPUUlw39OABqmqSJ63BAHFjan2" : {
  "Savitha" : {
    "-L4Vrd8ZrlgX94RbAS6W" : {
      "from" : "8hbPUUlw39OABqmqSJ63BAHFjan2",
      "message" : "Hello",
      "seen" : false,
      "time" : 1517748655103,
      "type" : "text"
    },
    "-L4VrdyO1mdQdER9BuZ2" : {
      "from" : "8hbPUUlw39OABqmqSJ63BAHFjan2",
      "message" : "Nope?",
      "seen" : false,
      "time" : 1517748658463,
      "type" : "text"
    },
    "-L4WUkbKnBU5GLLUOK3R" : {
      "from" : "8hbPUUlw39OABqmqSJ63BAHFjan2",
      "message" : "Oops",
      "seen" : false,
      "time" : 1517759171386,
      "type" : "text"
    }
  }
 },
 "Akash" : {
  "UXksdU8MBvMtO4Wsl9Bgg5JGsxI2" : {
    "-L4VpxxLm2WwN-yogzrL" : {
      "from" : "UXksdU8MBvMtO4Wsl9Bgg5JGsxI2",
      "message" : "Hello",
      "seen" : false,
      "time" : 1517748215965,
      "type" : "text"
    },
    "-L4VrZ6o7541T_gorBuB" : {
      "from" : "UXksdU8MBvMtO4Wsl9Bgg5JGsxI2",
      "message" : "Hiii",
      "seen" : false,
      "time" : 1517748634453,
      "type" : "text"
    }
  }
},
"Savitha" : {
  "8hbPUUlw39OABqmqSJ63BAHFjan2" : {
    "-L4Vrd8ZrlgX94RbAS6W" : {
      "from" : "8hbPUUlw39OABqmqSJ63BAHFjan2",
      "message" : "Hello",
      "seen" : false,
      "time" : 1517748655103,
      "type" : "text"
    },
    "-L4VrdyO1mdQdER9BuZ2" : {
      "from" : "8hbPUUlw39OABqmqSJ63BAHFjan2",
      "message" : "Nope?",
      "seen" : false,
      "time" : 1517748658463,
      "type" : "text"
    },
    "-L4WUkbKnBU5GLLUOK3R" : {
      "from" : "8hbPUUlw39OABqmqSJ63BAHFjan2",
      "message" : "Oops",
      "seen" : false,
      "time" : 1517759171386,
      "type" : "text"
    }
  }
},
"UXksdU8MBvMtO4Wsl9Bgg5JGsxI2" : {
  "Akash" : {
    "-L4VpxxLm2WwN-yogzrL" : {
      "from" : "UXksdU8MBvMtO4Wsl9Bgg5JGsxI2",
      "message" : "Hello",
      "seen" : false,
      "time" : 1517748215965,
      "type" : "text"
    },
    "-L4VrZ6o7541T_gorBuB" : {
      "from" : "UXksdU8MBvMtO4Wsl9Bgg5JGsxI2",
      "message" : "Hiii",
      "seen" : false,
      "time" : 1517748634453,
      "type" : "text"
    }
  }
}
},
"Users" : {
"8hbPUUlw39OABqmqSJ63BAHFjan2" : {
  "Email" : "",
  "Name" : "Akash",
  "Quote" : "",
  "Status" : ""
},
"UXksdU8MBvMtO4Wsl9Bgg5JGsxI2" : {
  "Email" : "",
  "Name" : "Savitha",
  "Quote" : "",
  "Status" : ""
}

} }

我猜数据库出了问题，就像我拿这个错误一样。

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