问题
I'm using the following code to send a notification from one device to another using FCM. Everything works fine until before return admin.messaging().sendToDevice(...). The 'Token ID: ' log displays token ID of the receiver, but when I set the variable token_id to the sendToDevice function, the notification is not called, therefore the notification is not sent.
Can someone tell me what's wrong?
'use strict'
const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);
exports.sendNotification = functions.database.ref('/notifications/{user_id}/{notification_id}').onWrite(event => {
const user_id = event.params.user_id;
const notification_id = event.params.notification_id;
console.log('We have a notification to send to ', user_id);
if(!event.data.val()){
return console.log('Notification has been deleted from the database: ', notification_id);
}
const fromUser = admin.database().ref(`/notifications/${user_id}/${notification_id}`).once('value');
return fromUser.then(fromUserResult => {
const from_user_id = fromUserResult.val().from;
console.log('You have a new notification from ', from_user_id);
const user_query = admin.database().ref(`/usuarios/${from_user_id}/nome`).once('value');
return user_query.then(userResult => {
const user_name = userResult.val();
const device_token = admin.database().ref(`/usuarios/${user_id}/device_token`).once('value');
return device_token.then(result => {
const token_id = result.val();
console.log('Token ID: ', token_id);
const payload = {
notification: {
title: "New Request",
body: `${user_name} has sent you a request.`,
icon: "default",
},
data: {
p_tab: "2"
}
};
return admin.messaging().sendToDevice(token_id, payload).then(response =>{
console.log('Notification sent to ', user_id);
});
});
});
});
});EDIT Code I use to save Firebase Instance ID to the current user's database.
String deviceToken = FirebaseInstanceId.getInstance().getToken();
usersRef.child(FirebaseAuth.getInstance().getCurrentUser().getUid()).child("device_token").setValue(deviceToken);来源：https://stackoverflow.com/questions/45423966/firebase-cloud-messaging-function-sendtodevice-not-working