I’m using FCM for Topic Messaging on Android.
If I call the
FirebaseMessaging.getInstance().subscribeToTopic("news") multiple times to subscribe ‘news’ topic, what will happen?
I spent my time searching for it but I couldn’t. I’m using that method in my MainActivity so It’s called every time when app is launched. In my experience It’s not problem to get push messages and I couldn’t find out any problems yet. But I wanna know it exactly when I call it multiple times.
You can only be subscribed to a topic once.
Additional calls to
subscribeToTopic() for the same topic are essentially no-ops, they make no difference.