Discovering Espresso for Android: how to get current activity?

Discovering Espresso for Android: how to get current activity?

August 14, 2014

When writing Espresso tests there is always a need of getting current activity while testing with Espresso for Android across multiple activities. Below is the solution:

import static android.support.test.runner.lifecycle.Stage.RESUMED;
import android.support.test.internal.runner.lifecycle.ActivityLifecycleMonitorRegistry;

Activity currentActivity = null;

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;
}

The thing is that getActivitiesInStage(Stage.RESUMED) returns us all activities in RESUMED state, and the activity which is currently displayed on screen, will be the first one in list.