FCM通知退订

Question

I have implemented Firebase cloud messaging in my app for push notifications. Everything working fine. But notifications are getting even user logged out from app. If user uninstalled the app directly then how can i unsubscribe the topic notification. if i have subscribe the a topic and now i unsubscribe the topic and subscribe the new topic then i also receiving notification for old subscribe topic also.

Answer 1

if your are subscribing to fcm topic then there is way to unsubscribe from that topic to not recieve any notifications for that topic.

below is the method you need:

unsubscribeFromTopic (String topic)

check google firebase docs here:

https://firebase.google.com/docs/reference/android/com/google/firebase/messaging/FirebaseMessaging

Answer 2

When you uninstall the app, the service handling the FCM messages and notifications will also be removed from the device. So you won't be receiving any push notifications once you uninstall.

Answer 3

As @Charan mentioned when you uninstall application FCM Push stop automatically. However if you want to stop it programmatically, do below:

new Thread(new Runnable() {
    @Override
    public void run() {
        try {
            FirebaseInstanceId.getInstance().deleteInstanceId();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}).start();

I have placed deleteInstanceId() in a separate thread to stop java.io.IOException: MAIN_THREAD W/System.err and wrapped with try / catch to handle IOException .

Answer 4

To unsubscribe from a topic in Firebase Cloud Messaging (FCM), you need to call the unsubscribeFromTopic method of the FirebaseMessaging instance and pass the topic name as an argument.

Here's an example in Android:

FirebaseMessaging.getInstance().unsubscribeFromTopic("topic_name");

And here's an example in iOS:

Messaging.messaging().unsubscribe(fromTopic: "topic_name")

Regarding the issue with receiving notifications for the old topic after subscribing to a new topic, you should make sure to unsubscribe from the old topic before subscribing to the new topic. Also, make sure that you are subscribing to the new topic correctly and that the client app is correctly handling the topic subscriptions. You can try to test the subscriptions on a test device and check the logs for any errors.

If the problem persists, you may need to check the server-side code that is responsible for sending the notifications and make sure that it is sending the notifications to the correct topics.