private String getLoadingString() {
   if (isLoading) {
     return context.getString(R.string.text_please_wait);
   } else if (app.getSubjectCount() == 0) {
     return context.getString(R.string.text_no_subjects);
   } else {
     return context.getString(R.string.text_no_subjects_in_time);
   }
 }
 void loadData() {
   this.mSubjects = app.getVisibleSubjects();
 }