我正在使用以下代码使用FCM从一台设备向另一台设备发送通知。一切正常，直到return admin.messaging().sendToDevice(...)之前。 “令牌ID：”日志显示接收者的令牌ID，但是当我将变量token_id设置为sendToDevice函数时，不会调用通知，因此不会发送通知。
有人能告诉我什么是错的吗？
'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);
});
});
});
});
});
编辑我用于将Firebase实例ID保存到当前用户数据库的代码。
String deviceToken = FirebaseInstanceId.getInstance().getToken();
usersRef.child(FirebaseAuth.getInstance().getCurrentUser().getUid()).child("device_token").setValue(deviceToken);