code: private void setCurrentItemShowing(int index, boolean animateCircle, boolean delayLabelAnimate,
                                         boolean announce) {
          mTimePicker.setCurrentItemShowing(index, animateCircle);
  
          TextView labelToAnimate;
          if (index == HOUR_INDEX) {
              int hours = mTimePicker.getHours();
              if (!mIs24HourMode) {
                  hours = hours % 12;
              }
              mTimePicker.setContentDescription(mHourPickerDescription + ": " + hours);
              if (announce) {
                  DateTimePickerUtils.tryAccessibilityAnnounce(mTimePicker, mSelectHours);
              }
              labelToAnimate = mHourView;
          } else {
              int minutes = mTimePicker.getMinutes();
              mTimePicker.setContentDescription(mMinutePickerDescription + ": " + minutes);
              if (announce) {
                  DateTimePickerUtils.tryAccessibilityAnnounce(mTimePicker, mSelectMinutes);
              }
              labelToAnimate = mMinuteView;
          }
  
          mHourView.setSelected(index == HOUR_INDEX);
          mMinuteView.setSelected(index == MINUTE_INDEX);
  
          ObjectAnimator pulseAnimator = DateTimePickerUtils.getPulseAnimator(labelToAnimate, 0.85f, 1.1f);
          if (delayLabelAnimate) {
              pulseAnimator.setStartDelay(PULSE_ANIMATOR_DELAY);
          }
          pulseAnimator.start();
      }
docs: Show either Hours or Minutes.