Application Level onResume Android

Question

Problem

The idea is very simple. Whenever an user comes back to my app from the Recents I want to show a simple dialog prompting with the password.<

Answer 1

I would suggest using LifecycleObserver. If your Application class implements this interface it marks a class as a LifecycleObserver, it does not have any methods, instead, it relies on OnLifecycleEvent annotated methods. The usage is simple:

public class AndroidApplication extends Application implements LifecycleObserver {

    @OnLifecycleEvent(Lifecycle.Event.ON_START)
    public void onAppStart() {
         //enter code here
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_STOP)
    public void onAppStop() {
         //enter code here
    }

    ...etc
}

With Lifecycle.Event you can access all lifecycle states through Enum. It is part of androidx.