code: private void setItem(int index, int value) {
          if (index == HOUR_INDEX) {
              setValueForItem(HOUR_INDEX, value);
              int hourDegrees = (value % 12) * HOUR_VALUE_TO_DEGREES_STEP_SIZE;
              mHourRadialSelectorView.setSelection(hourDegrees, isHourInnerCircle(value), false);
              mHourRadialSelectorView.invalidate();
          } else if (index == MINUTE_INDEX) {
              setValueForItem(MINUTE_INDEX, value);
              int minuteDegrees = value * MINUTE_VALUE_TO_DEGREES_STEP_SIZE;
              mMinuteRadialSelectorView.setSelection(minuteDegrees, false, false);
              mMinuteRadialSelectorView.invalidate();
          }
      }
docs: Set either the hour or the minute. Will set the internal value, and set the selection.