Getting current activity

getActivityInstance.java

//http://qathread.blogspot.de/2014/09/discovering-espresso-for-android-how-to.html
//http://stackoverflow.com/questions/25998659/espresso-how-can-i-check-if-an-activity-is-launched-after-performing-a-certain
public Activity getActivityInstance(){
    getInstrumentation().runOnMainSync(new Runnable() {
        public void run() {
            Collection resumedActivities = ActivityLifecycleMonitorRegistry.getInstance().getActivitiesInStage(RESUMED);
            if (resumedActivities.iterator().hasNext()){
                currentActivity = resumedActivities.iterator().next();
            }
        }
    });

    return currentActivity;
}