需要將通知只發送給收件人的設備，而不是發件人的發件人

Question

我真的被卡住了，並且只想將通知只發送給使用Firebase的特定用戶。我知道FCM方法並獲得了令牌。但是本教程或其他教程使我向包括髮件人在內的兩個用戶發送推送通知。我只想收到收件人設備上的通知。這是漫長的一天，我一直在解決這個問題。 現在尋找收件人的某個鍵或UID。它是從我有的令牌獲取：FirebaseInstanceId.getInstance().getToken();

更新：我無法存儲和檢索令牌（設備令牌）和其他子項，也能夠在Firebase「函數」選項卡中記錄消息，但仍然無法將通知推送到設備。我正在仿真器上測試它。我應該在真實設備上測試它嗎？

我的Node.js代碼：

const functions = require('firebase-functions'); 
const admin = require('firebase-admin'); 
admin.initializeApp(functions.config().firebase); 

var rootRef = 
functions.database.ref('/notifications/{user_id}/{notification_id}'); 

    exports.sendNotification = rootRef.onWrite(event => { 


    const user_id = event.params.user_id; 
    const notification_id = event.params.notification_id; 

    var request = event.data.val(); 

    var payload = { 
    data: { 
     title : "New Message from ", 
     body: "userName has sent you message", 
     icon: "default", 
    } 
    }; 

console.log('We have a notification for device token: ', user_id); 
console.log('Checking if getting inside the node -- ', request.user); 


admin.messaging().sendToDevice(user_id, payload) 
.then(function(response){ 
    console.log('This was the notification Feature',response);  
}) 
.catch(function(error){ 
    console.log('Error sending message ',error);  

    }) 

}) 

MyFirebaseMEssagingService.java

public class MyFirebaseMessagingService extends FirebaseMessagingService 
{ 
    private static final String TAG = "FCM Service"; 
    @Override 
    public void onMessageReceived(RemoteMessage remoteMessage) { 
     // TODO: Handle FCM messages here. 
     // If the application is in the foreground handle both data and 
     notification messages here. 
     // Also if you intend on generating your own notifications as a result 
     of a received FCM 
     // message, here is where that should be initiated. 
     //remoteMessage.getNotification().getBody()); 

     if(remoteMessage.getNotification()!=null){ 
      Map<String,String> payload = remoteMessage.getData(); 
      //   String title = 
      remoteMessage.getNotification().getTitle(); 
      //   String message = 
      remoteMessage.getNotification().getBody(); 
      //  Log.d(TAG, "Message Notification Title : " + title); 
      //  Log.d(TAG, "Message Notification Body: " + message); 
      System.out.println("Messaging Service : Title - " + payload.get("title") 
      + " , body - " + payload.get("body")); 
      sendNotification(payload); 

     } 
    } 

    @Override 
    public void onDeletedMessages(){ 

    } 

    private void sendNotification(Map<String,String> payload){ 

     NotificationCompat.Builder builder = new 
       NotificationCompat.Builder(this); 
     builder.setSmallIcon(R.mipmap.ic_launcher); 
     builder.setContentTitle("Firebase Push 
       Notification"+payload.get("title")); 
       builder.setContentText("Notification Text : "+ payload.get("body")); 
       Intent intent = new Intent(this, ChatWindow.class); 
       TaskStackBuilder stackBuilder = TaskStackBuilder.create(this); 
       stackBuilder.addNextIntent(intent); 
       PendingIntent pendingIntent = 
         stackBuilder.getPendingIntent(0,PendingIntent.FLAG_UPDATE_CURRENT); 
       builder.setContentIntent(pendingIntent); 
       NotificationManager notificationManager = (NotificationManager) 
         getSystemService(Context.NOTIFICATION_SERVICE); 
       notificationManager.notify(0, builder.build()); 

    } 

} 

FirebaseIDService.java：

public class FirebaseIDService extends FirebaseInstanceIdService { 
    private static final String TAG = "FirebaseIDService"; 

    @Override 
    public void onTokenRefresh() { 
     // Get updated InstanceID token. 
     String refreshedToken = FirebaseInstanceId.getInstance().getToken(); 
     Log.d(TAG, "Refreshed token: " + refreshedToken); 

     DatabaseReference firebase ;//= new Firebase("https://materialtabs- 
     b5734.firebaseio.com//messages"); 
     firebase = 
     FirebaseDatabase.getInstance().getReferenceFromUrl("https://materialtabs- 
       b5734.firebaseio.com//notifications/"); 

       // TODO: Implement this method to send any registration to your app's 
       servers. 
       sendRegistrationToServer(refreshedToken); 
    } 

    /** 
    * Persist token to third-party servers. 
    * 
    * Modify this method to associate the user's FCM InstanceID token with any 
    server-side account 
    * maintained by your application. 
    * 
    * @param token The new token. 
    */ 
    private void sendRegistrationToServer(String token) { 
     // Add custom implementation, as needed. 
     System.out.println("Reading Token : "+ token); 
    } 
} 

而且我開始我的 'MyFirebaseMessagingService.java' 在我的MainActivity文件在「onCreate（）」 作爲「startService（new I ntent（this，MyFirebaseMessagingService.class））;「

請幫幫我。我想我錯過了一些小的細節，或者它可能是重大的，不確定！

Answer 1

爲此，您需要存儲收件人設備的firebase令牌，然後每當您要將通知發送給收件人時，都必須從數據庫中檢索收件人的令牌，然後可以使用該令牌給唯一的收件人。