detect-background-part2

public class DetectBackgroundApp extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        registerActivityLifecycleCallbacks(
                new ActivityLifecycleCallbacks() {
                    @Override
                    public void onActivityPaused(Activity activity) {
                        BackgroundJobService.enqueueWork(activity);
                    }
                    @Override
                    public void onActivityResumed(Activity activity) {
                        BackgroundJobService.stopWork();
                    }
                    ... rest of the callbacks ...
                });
    }
}