public static DoubleDatePickerDialogFragment newInstance(ArrayList<UTClass> classList) {
   DoubleDatePickerDialogFragment ddpdf = new DoubleDatePickerDialogFragment();
   Bundle args = new Bundle();
   args.putParcelableArrayList("classList", classList);
   ddpdf.setArguments(args);
   return ddpdf;
 }
  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();
    switch (id) {
      case R.id.map_all_classes:
        // check to see if we're done loading the schedules (the
        // ScheduleClassAdapter is initialized in onPostExecute)
        if (adapter != null) {
          // populate an array with the buildings IDs of all of the user's classtimes
          ArrayList<String> buildings = new ArrayList<String>();

          for (UTClass clz : classList) {
            for (Classtime clt : clz.getClassTimes()) {
              if (!buildings.contains(clt.getBuilding().getId())) {
                buildings.add(clt.getBuilding().getId());
              }
            }
          }

          Intent map =
              new Intent(
                  getString(R.string.building_intent), null, parentAct, CampusMapActivity.class);
          map.putStringArrayListExtra("buildings", buildings);
          startActivity(map);
          break;
        }
      case R.id.export_schedule:
        // version-gate handled by xml, but just to make sure...
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
          // check to see if we're done loading the schedules (the
          // ScheduleClassAdapter is initialized in onPostExecute)
          if (adapter != null) {
            FragmentManager fm = parentAct.getSupportFragmentManager();
            DoubleDatePickerDialogFragment ddpDlg =
                DoubleDatePickerDialogFragment.newInstance(classList);
            ddpDlg.show(fm, "fragment_double_date_picker");
          }
        } else {
          Toast.makeText(
                  parentAct,
                  "Export to calendar is not supported on this version of Android",
                  Toast.LENGTH_SHORT)
              .show();
        }

        break;
      default:
        return super.onOptionsItemSelected(item);
    }
    return true;
  }