Simplifying clear-all transparency calculation

        final int childCount = getChildCount();

        final int childCount = getChildCount();

        if (mShowEmptyMessage || childCount == 0) return 0;

        if (mShowEmptyMessage || childCount == 0) return 0;

        final View lastChild = getChildAt(childCount - 1);

        final int scrollEnd = mIsRtl ? 0 : mMaxScrollX;

        final int oldestChildScroll = getScrollForPage(childCount - 1);

        // Current visible coordinate of the end of the oldest task.

        final int carouselCurrentEnd =

                (mIsRtl ? lastChild.getLeft() : lastChild.getRight()) - getScrollX();

        // Visible button-facing end of a centered task.

        final int centeredTaskEnd = mIsRtl ?

                getPaddingLeft() + mInsets.left :

                getWidth() - getPaddingRight() - mInsets.right;

        // The distance of the carousel travel during which the alpha changes from 0 to 1. This

        // is the motion between the oldest task in its centered position and the oldest task

        // scrolled to the end.

        final int alphaChangeRange = (mIsRtl ? 0 : mMaxScrollX) - getScrollForPage(childCount - 1);

        return Utilities.boundToRange(

        return Utilities.boundToRange(

                ((float) (centeredTaskEnd - carouselCurrentEnd)) /

                ((float) (getScrollX() - oldestChildScroll)) /

                        alphaChangeRange, 0, 1);

                        (scrollEnd - oldestChildScroll), 0, 1);

    }

    }

    private void updateClearAllButtonAlpha() {

    private void updateClearAllButtonAlpha() {