有没有办法限制特定屏幕的 fcm 通知？

Question

I have a question about the FCM notification limit. Is there any way that I can limit FCM notifications for a specific screen? For example, if there are three screens, screen A, screen B, and screen C, the notification should be received on-screen A and B but should not be received while user is viewing screen C.

If I am right, I think it has to check if screen C is showing on the device before sending notifications. So how can I check which screen is showing and how to limit notifications for a specific screen?

Answer 1

One way to do it would be to intercept all fcm if app is in foreground, to check if app is in foreground you can use this in your FCMService

if(ProcessLifecycleOwner.get().lifecycle == Lifecycle.State.RESUMED)
   LocalBroadcastManager.sendBroadcast(Intent())

you need to add lifecycle dependencies for it

    implementation "androidx.lifecycle:lifecycle-extensions:2.2.0"
    kapt "android.arch.lifecycle:compiler:1.1.1"

then you can register a broadcast receiver from your screen C and send explicit broadcast from FCMService.

Note that the broadcast receiver is registered on screen C onResume and unregistered on onDestroy .

More info on how to use explicit BroadcastReceiver here