code: public static AppEventsLogger newLogger(Context context, String applicationId) {
          return new AppEventsLogger(context, applicationId, null);
      }
docs: Build an AppEventsLogger instance to log events that are attributed to the application but not to
  any particular Session.
  
  @param context       Used to access the attributionId for non-authenticated users.
  @param applicationId Explicitly specified Facebook applicationId to log events against.  If null, the default
  app ID specified
  in the package metadata will be used.
  @return AppEventsLogger instance to invoke log* methods on.