/**
   * Initialize the Layout with starting values.
   *
   * @param context
   * @param initialHoursOfDay
   * @param initialMinutes
   * @param is24HourMode
   */
  public void initialize(
      Context context,
      int initialHoursOfDay,
      int initialMinutes,
      boolean is24HourMode,
      boolean vibrate) {
    if (mTimeInitialized) {
      Log.e(TAG, "Time has already been initialized.");
      return;
    }
    mIs24HourMode = is24HourMode;
    mHideAmPm = Utils.isTouchExplorationEnabled(mAccessibilityManager) ? true : mIs24HourMode;

    mVibrate = vibrate;

    // Initialize the circle and AM/PM circles if applicable.
    mCircleView.initialize(context, mHideAmPm);
    mCircleView.invalidate();
    if (!mHideAmPm) {
      mAmPmCirclesView.initialize(context, initialHoursOfDay < 12 ? AM : PM);
      mAmPmCirclesView.invalidate();
    }

    // Initialize the hours and minutes numbers.
    Resources res = context.getResources();
    int[] hours = {12, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11};
    int[] hours_24 = {0, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23};
    int[] minutes = {0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55};
    String[] hoursTexts = new String[12];
    String[] innerHoursTexts = new String[12];
    String[] minutesTexts = new String[12];
    for (int i = 0; i < 12; i++) {
      hoursTexts[i] =
          is24HourMode ? String.format("%02d", hours_24[i]) : String.format("%d", hours[i]);
      innerHoursTexts[i] = String.format("%d", hours[i]);
      minutesTexts[i] = String.format("%02d", minutes[i]);
    }
    mHourRadialTextsView.initialize(
        res, hoursTexts, (is24HourMode ? innerHoursTexts : null), mHideAmPm, true);
    mHourRadialTextsView.invalidate();
    mMinuteRadialTextsView.initialize(res, minutesTexts, null, mHideAmPm, false);
    mMinuteRadialTextsView.invalidate();

    // Initialize the currently-selected hour and minute.
    setValueForItem(HOUR_INDEX, initialHoursOfDay);
    setValueForItem(MINUTE_INDEX, initialMinutes);
    int hourDegrees = (initialHoursOfDay % 12) * HOUR_VALUE_TO_DEGREES_STEP_SIZE;
    mHourRadialSelectorView.initialize(
        context, mHideAmPm, is24HourMode, true, hourDegrees, isHourInnerCircle(initialHoursOfDay));
    int minuteDegrees = initialMinutes * MINUTE_VALUE_TO_DEGREES_STEP_SIZE;
    mMinuteRadialSelectorView.initialize(context, mHideAmPm, false, false, minuteDegrees, false);

    mTimeInitialized = true;
  }
  /**
   * Set either minutes or hours as showing.
   *
   * @param animate True to animate the transition, false to show with no animation.
   */
  @SuppressLint("NewApi")
  public void setCurrentItemShowing(int index, boolean animate) {
    if (index != HOUR_INDEX && index != MINUTE_INDEX) {
      Log.e(TAG, "TimePicker does not support view at index " + index);
      return;
    }

    // NineOldDroids does not work in this case due to denepency recursion.
    animate = animate && Build.VERSION.SDK_INT >= 14;

    int lastIndex = getCurrentItemShowing();
    mCurrentItemShowing = index;

    if (animate && (index != lastIndex)) {
      ObjectAnimator[] anims = new ObjectAnimator[4];
      if (index == MINUTE_INDEX) {
        anims[0] = mHourRadialTextsView.getDisappearAnimator();
        anims[1] = mHourRadialSelectorView.getDisappearAnimator();
        anims[2] = mMinuteRadialTextsView.getReappearAnimator();
        anims[3] = mMinuteRadialSelectorView.getReappearAnimator();
      } else if (index == HOUR_INDEX) {
        anims[0] = mHourRadialTextsView.getReappearAnimator();
        anims[1] = mHourRadialSelectorView.getReappearAnimator();
        anims[2] = mMinuteRadialTextsView.getDisappearAnimator();
        anims[3] = mMinuteRadialSelectorView.getDisappearAnimator();
      }

      if (mTransition != null && mTransition.isRunning()) {
        mTransition.end();
      }
      mTransition = new AnimatorSet();
      mTransition.playTogether(anims);
      mTransition.start();
    } else {
      if (Build.VERSION.SDK_INT >= 11) {
        int hourAlpha = (index == HOUR_INDEX) ? 255 : 0;
        int minuteAlpha = (index == MINUTE_INDEX) ? 255 : 0;
        mHourRadialTextsView.setAlpha(hourAlpha);
        mHourRadialSelectorView.setAlpha(hourAlpha);
        mMinuteRadialTextsView.setAlpha(minuteAlpha);
        mMinuteRadialSelectorView.setAlpha(minuteAlpha);
      } else {
        int hourVisibility = (index == HOUR_INDEX) ? View.VISIBLE : View.INVISIBLE;
        int minuteVisibility = (index == MINUTE_INDEX) ? View.VISIBLE : View.INVISIBLE;
        mHourRadialTextsView.setVisibility(hourVisibility);
        mHourRadialSelectorView.setVisibility(hourVisibility);
        mMinuteRadialTextsView.setVisibility(minuteVisibility);
        mMinuteRadialSelectorView.setVisibility(minuteVisibility);
      }
    }
  }