在Firebase通知消息中删除=

Question

当我使用 Firebase 向其他设备发送通知时，通知数据中会显示=符号。有没有办法摆脱这个？

public void sendnotification(String username,long user_unique){


        try {
                    Sender sender = new FCMSender(fcmKey);

                    Message message = new Message.Builder()
                            .collapseKey(username)
                            .timeToLive(3)
                            .delayWhileIdle(true)

                            .addData(username, "Request to book ticket")
                            .build();

                    String refreshedToken = FirebaseInstanceId.getInstance().getToken();


                    System.out.println("Refreshed token: " + refreshedToken);
                    Result result = sender.send(message,
                           iid, 1);

                    System.out.println("Result: " + result.toString());
                } catch (Exception e) {
                    e.printStackTrace();
                }



    }

这将显示在收到User=Request to book ticket通知的设备中。我想摆脱

之间的'='号