How to discover what Activity is on the foreground in Android app?

Issue

I need to implement the logic - If user on chat activity then I don't need to show push notification with new message. So I need to know what activity is on the screen. For this purpose I found this answer How to get current foreground activity context in android? But I don't understand how to use

public void registerActivityLifecycleCallbacks (Application.ActivityLifecycleCallbacks callback)

Can some one give me a full example how to discover what activity is on screen?

Solution

You have to implement onActivityPaused and onActivityResumed()

    public class YourApplication extends Application implements
    Application.ActivityLifecycleCallbacks {

    public static boolean isChatVisible=false;   

    public void onCreate() {
        super.onCreate();
        registerActivityLifecycleCallbacks(this);
    }

    @Override
    public void onActivityCreated(Activity p0, Bundle p1) {

    }

    @Override
    public void onActivityStarted(Activity p0) {

    }

    @Override
    public void onActivityResumed(Activity p0) {

         isChatVisible=p0 instanceof ChatActivity;
    }

    @Override
    public void onActivityPaused(Activity p0) {

    }

    @Override
    public void onActivityStopped(Activity p0) {

    }

}

Before building the notification just check YourApplication.isChatVisible()

Answered By - Rajasekaran M