ui automation - Get Current Activity in Espresso android

Question

In case of a test that crosses multiple activities, is there a way to get current activity?

getActivtiy() method just gives one activity that was used to start the test.

I tried something like below,

public Activity getCurrentActivity() {
    Activity activity = null;
    ActivityManager am = (ActivityManager) this.getActivity().getSystemService(Context.ACTIVITY_SERVICE);
    List<ActivityManager.RunningTaskInfo> taskInfo = am.getRunningTasks(1);
    try {
        Class<?> myClass = taskInfo.get(0).topActivity.getClass();
        activity = (Activity) myClass.newInstance();
    }
    catch (Exception e) {

    }
    return activity;
}

but I get null object.

Answer 1

In Espresso, you can use ActivityLifecycleMonitorRegistry but it is not officially supported, so it may not work in future versions.

Here is how it works:

Activity getCurrentActivity() throws Throwable {
  getInstrumentation().waitForIdleSync();
  final Activity[] activity = new Activity[1];
  runTestOnUiThread(new Runnable() {
    @Override
    public void run() {
      java.util.Collection<Activity> activities = ActivityLifecycleMonitorRegistry.getInstance().getActivitiesInStage(Stage.RESUMED);
      activity[0] = Iterables.getOnlyElement(activities);
  }});
  return activity[0];
}