code: public static void activateApp(Context context) {
          Settings.sdkInitialize(context);
          activateApp(context, Utility.getMetadataApplicationId(context));
      }
docs: Notifies the events system that the app has launched & logs an activatedApp event.  Should be called whenever
  your app becomes active, typically in the onResume() method of each long-running Activity of your app.
  
  Use this method if your application ID is stored in application metadata, otherwise see
  {@link AppEventsLogger#activateApp(android.content.Context, String)}.
  
  @param context Used to access the applicationId and the attributionId for non-authenticated users.