尝试通过Firebase Cloud Functions发送通知后出错（Android）

Question

我对Firebase和Nodejs是新手。我正在尝试使用Firebase Cloud函数从一个设备发送通知到另一个设备。

这是发送通知的node.js代码：

var functions = require('firebase-functions');
var admin = require('firebase-admin');

admin.initializeApp(functions.config().firebase);

exports.sendNotification = functions.database.ref('/sendNotification/{notificationId}')
        .onWrite(event => {

        var regToken="fYRweeL8cic:APA91bH6Q_gyKKrLL...";

        // Grab the current value of what was written to the Realtime Database.
        var eventSnapshot = event.data;

        var payload = {
            data: {
                title: eventSnapshot.child("title").val()
            }
        };

        // Set the message as high priority and have it expire after 24 hours.
        var options = {
        priority: "high",
        timeToLive: 60 * 60 * 24
        };


    admin.messaging().sendToDevice(regToken,payload,options)
    .then(function(response){
        console.log("Successfully sent message: ", response);
    })
    .catch(function(error){
        console.log("Error sending message: ", error);
    })
})

这是将通知添加到实时数据库以触发函数的代码：

 public void sendNotification(){
        FirebaseDatabase database = FirebaseDatabase.getInstance();
        final DatabaseReference myRef = database.getReference("sendNotification");

        myRef.addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                Toast.makeText(getApplicationContext(),
                        "sent", Toast.LENGTH_SHORT).show();

            Map data = new HashMap();
            data.put("title", "this is my title");
            data.put("message", "this is the message");
            myRef.push().setValue(data);
            }

            @Override
            public void onCancelled(DatabaseError databaseError) {

            }
        });

    }

 {"results":[{"error":{"code":"messaging/registration-token-not-registered","message":"The provided registration token is not registered. A previously valid registration token can be unregistered for a variety of reasons. See the error documentation for more details. Remove this registration token and stop using it to send messages."}}],"canonicalRegistrationTokenCount":0,"failureCount":1,"successCount":0,"multicastId":6051985890611026000}

反应真的很清楚，代币已经改变了。我已经将它更改为有效的令牌，它起作用了。

Answer 1

正如注释中所建议的，我使用了:json.stringify(response)来获取更多信息。这是回应：

 {"results":[{"error":{"code":"messaging/registration-token-not-registered","message":"The provided registration token is not registered. A previously valid registration token can be unregistered for a variety of reasons. See the error documentation for more details. Remove this registration token and stop using it to send messages."}}],"canonicalRegistrationTokenCount":0,"failureCount":1,"successCount":0,"multicastId":6051985890611026000}

反应真的很清楚，代币已经改变了。我已经将它更改为有效的令牌，它起作用了。