code: @SuppressWarnings("unused")
      public static DatePickerDialog newInstance(OnDateSetListener callback) {
          Calendar now = Calendar.getInstance();
          return DatePickerDialog.newInstance(callback, now);
      }
docs: Create a new DatePickerDialog instance initialised to the current system date.
  @param callback How the parent is notified that the date is set.
  @return a new DatePickerDialog instance