AnimatedLayout part 5: update LinearLayout with parallaxValue

CustomLinearLayout.java

   @Override
    public int scrollVerticallyBy(int dy, RecyclerView.Recycler recycler,
                                  RecyclerView.State state) {
        ...
        if (parentLayout != null) {
            animatedLayout = parentLayout.findViewById(R.id.transformItem);
            float translateValue = computeCurrentParallaxOffset(parentLayout);
            animatedLayout.applyParallax(translateValue);
        }
        ...
    }

    private float computeCurrentParallaxOffset(View animatedItem) {
        float parallaxOffsetMax = animatedItem.getHeight() / 8f;
        float centerRecyclerViewY = computeRecyclerViewCenterY();
        float fulOffsetFromCenterPx = animatedItem.getHeight() / 2f + centerRecyclerViewY;
        float centerItemY = computeItemCenterY(animatedItem);
        float currentOffsetFromCenterPx = centerRecyclerViewY - centerItemY;
        float normalizedCurrentScrollOffset = currentOffsetFromCenterPx / fulOffsetFromCenterPx;
        float translateFromCenterY = normalizedCurrentScrollOffset * parallaxOffsetMax;
        return translateFromCenterY;
    }