使用用户的UID发送Firebase Cloud消息 [英] Sending Firebase Cloud Message using UID of user

问题描述

我想构建一个Android应用，允许用户向其他用户发送通知和数据消息.我只是最近才开始使用Firebase，而Firebase Cloud Messaging仍然让我感到困惑.

我已经实现了使用Firebase实例ID向特定的设备发送消息.但是，在我的应用程序中，用户可以使用其他设备注销并登录其帐户，所以这并不是我真正想要的.我阅读了文档，这非常令人困惑，他们提到将消息发送给用户组和主题(只有应用程序可以订阅，用户不能订阅).

有没有一种方法可以仅使用其UID直接向另一个用户或一组用户发送推送通知?如果没有，我还有其他方法可以实现吗?

I want to build an Android app that allows a user to send notification and data messages to other users. I've started using Firebase only recently, and Firebase Cloud Messaging is still pretty confusing to me.

I have already implemented sending a message to a specific device using the Firebase Instance Id. However, in my app, a user can log out and log into their accounts using different devices, so this isn't really what I want. I read the documentation and it's pretty confusing, they mention sending messages to user groups, and topics (which only apps can subscribe to, not users).

Is there a way to send a push notification directly to another user or a group of users using only their UIDs? If not, is there any other way I can implement this?

推荐答案

好的，因此，为确保用户登录时该功能可在多个设备上使用，我只是让设备订阅一个名称与用户名称相同的主题UID.现在，如果我想向用户发送通知，我只需发送有关该主题的FCM消息，其名称等于用户的UID！

示例:如果我的UID等于"asdf"，则每当我使用多个设备登录时，每个设备都会自动订阅名称为"asdf"的主题.因此，现在，如果我从服务器发送有关此主题的FCM，则登录我的所有设备都将获得此通知.

Alright, so to make sure this works across multiple devices when a user logs in, I just make the device subscribe to a topic with the name equal to the user's UID. Now if I want to send a notification to a user, I just send an FCM message on the topic with the name equal to the user's UID!

Example: If my UID is equal to "asdf", whenever I login using multiple devices, each of the devices automatically subscribes to the topic with name "asdf". So now, if I send an FCM from the server on this topic, all the devices from which I am logged on to obtain this notification.

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