如何在每次用户注册到我的应用程序时使用Cloud Functions for Firebase发送通知 [英] How do i give notification every time user get registered to my app, using Cloud Functions for Firebase

问题描述

我创建了一个移动应用程序，当用户注册时，我需要发出通知。如果我在每次创建用户时都删除了通知数据库引用，那么它会给出通知，否则就不会。

//这里是我的android工作室java代码，当用户注册的时候

  if（task.isSuccessful（））{
 DatabaseReference reference = FirebaseDatabase.getInstance（）。getReference（Notifications）; 
 reference.child（token）。setValue（FirebaseInstanceId.getInstance（）。getToken（））; 
} 
  

//这个类我扩展了Firebase消息传递

  public class MessagingService扩展com.google.firebase.messaging.FirebaseMessagingService {
 $ b @Override 
 public void onMessageReceived（RemoteMessage remoteMessage）{
 if（remoteMessage.getData（）。size（）> 0）{
 Map< String，String> payload = remoteMessage.getData（）; 
 
 showNotification（payload）; 
 
 
 $ b $ private void showNotification（Map< String，String> payload）{
 NotificationCompat.Builder builder = new NotificationCompat.Builder（this）; 
 builder.setSmallIcon（R.mipmap.ic_launcher）; 
 builder.setContentTitle（payload.get（title））; 
 builder.setContentText（payload.get（message））; 
 builder.setAutoCancel（true）; 
 
 Intent intent = new Intent（this，MainTabActivity.class）; 
 TaskStackBuilder stackBuilder = TaskStackBuilder.create（this）; 
 
 stackBuilder.addNextIntent（intent）; 
 PendingIntent pendingIntent = stackBuilder.getPendingIntent（0，PendingIntent.FLAG_UPDATE_CURRENT）; 
 builder.setContentIntent（pendingIntent）; 
 
 NotificationManager n =（NotificationManager）getSystemService（Context.NOTIFICATION_SERVICE）; 
 
 n.notify（0，builder.build（））; 
 
 
 $ / code $ / pre 
 
 / p这是我设置令牌的类
  public class InstanceIdService extends com.google.firebase.iid.FirebaseInstanceIdService {
 
 @Override 
 public void onTokenRefresh（）{
 String refreshToken = FirebaseInstanceId.getInstance（）。getToken（）; 
 
 DatabaseReference reference = FirebaseDatabase.getInstance（）。getReference（Notifications）; 
 reference.child（token）。setValue（refreshToken）; 
 
 
 
 
 $ p $这是我的index.js文件 p> 
 
 
  const functions = require（'firebase-functions'）; 
 
 const admin = require（'firebase-admin'）; 
 admin.initializeApp（functions.config（）。firebase）; 
 
 exports.sendNotification = functions.database.ref（Notifications）
 .onWrite（event => {
 var request = event.data.val（）; 
 var payload = {
 data：{
 title：Welcome to ChitChat Group，
 message：您可能会有新消息
} 
} ; 
 
 admin.messaging（）。sendToDevice（request.token，payload）
 .then（function（response）{
 console.log（Successfully sent message： （错误）; 
}）
 .catch（函数（错误）{
 console.log ）; 
  
 
 
解决方案
用户'表，您存储用户信息，当一个新用户注册，并将他的信息存储在firebase数据库。
 
 
 
 查看我附加的截图数据库。我发现用下面的代码新增了userId和notificationToken： 
 $ b 
  exports.sendNotification = functions.database.ref（用户/ {userId} / {notificationToken}）
 .onWrite（event => {
 const userId = event.params.userId; 
 const notificationToken = event.params.notificationToken; 
 
 var payload = {
 data：{
 title：Welcome to ChitChat Group，
 message：You may have new messages
} 
 $; 
 admin.messaging（）。sendToDevice（notificationToken，payload）
 .then（function（response）{
 console.log（Successfully sent message：，response） ; 
。）
 .catch（function（error）{
 console.log（Error sending message：，error）; 
}）
} 
  
  
 
 
 
 如果您需要其他用户的详细信息， userId。 
 
I have created a mobile application I need to give notification when ever user get registered. if I delete the "Notifications" database reference in every time when I want to create a user it will give Notification otherwise it not. 

//here is my android studio java code when user registered
 if (task.isSuccessful()){
  DatabaseReference reference =FirebaseDatabase.getInstance().getReference("Notifications");
  reference.child("token").setValue(FirebaseInstanceId.getInstance().getToken());
 }
//this the class I extends Firebase Messaging
public class MessagingService extends com.google.firebase.messaging.FirebaseMessagingService {

    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        if(remoteMessage.getData().size()>0){
            Map<String,String> payload = remoteMessage.getData();

            showNotification(payload);
        }
    }

    private void showNotification(Map<String, String> payload) {
        NotificationCompat.Builder builder= new NotificationCompat.Builder(this);
        builder.setSmallIcon(R.mipmap.ic_launcher);
        builder.setContentTitle(payload.get("title"));
        builder.setContentText(payload.get("message"));
        builder.setAutoCancel(true);

        Intent intent = new Intent(this,MainTabActivity.class);
        TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);

        stackBuilder.addNextIntent(intent);
        PendingIntent pendingIntent=stackBuilder.getPendingIntent(0,PendingIntent.FLAG_UPDATE_CURRENT);
        builder.setContentIntent(pendingIntent);

        NotificationManager n = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);

        n.notify(0,builder.build());
    }
}
//this the class I set token
public class InstanceIdService extends com.google.firebase.iid.FirebaseInstanceIdService {

    @Override
    public void onTokenRefresh() {
        String refreshToken = FirebaseInstanceId.getInstance().getToken();

        DatabaseReference reference= FirebaseDatabase.getInstance().getReference("Notifications");
        reference.child("token").setValue(refreshToken);
    }
}
//this is my index.js file
const functions = require('firebase-functions');

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

exports.sendNotification = functions.database.ref("Notifications")
    .onWrite(event => {
        var request = event.data.val();
        var payload = {
            data: {
                title: "Welcome to ChitChat Group",
                message: "You may have new messages"
            }
        };

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

解决方案
Instead of working on 'Notification' you should use 'User' table, where you store user information, when a new user registered and you stored his info on firebase database.

Have a look at attached screenshot of my database. I found newly added userId and notificationToken with below code:
exports.sendNotification = functions.database.ref("Users/{userId}/{notificationToken}")
    .onWrite(event => {
      const userId = event.params.userId;
      const notificationToken = event.params.notificationToken;

      var payload = {
        data: {
            title: "Welcome to ChitChat Group",
            message: "You may have new messages"
        }
    };
      admin.messaging().sendToDevice(notificationToken, payload)
        .then(function (response) {
            console.log("Successfully sent message: ", response);
        })
        .catch(function (error) {
            console.log("Error sending message: ", error);
        }) 
}


If you need any other user detail, you can fetch that as well with the help of userId. 

                        
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