bro还更新吗，画廊模式需要解耦一下

    public Banner setBannerGalleryEffect(int leftItemWidth, int rightItemWidth, int pageMargin, float scale) {
        if (pageMargin > 0) {
            addPageTransformer(new MarginPageTransformer(BannerUtils.dp2px(pageMargin)));
        }
        if (scale < 1 && scale > 0) {
            addPageTransformer(new ScaleInTransformer(scale));
        }
        setRecyclerViewPadding(leftItemWidth > 0 ? BannerUtils.dp2px(leftItemWidth + pageMargin) : 0,
                rightItemWidth > 0 ? BannerUtils.dp2px(rightItemWidth + pageMargin) : 0);
        return this;
    }

    private void setRecyclerViewPadding(int leftItemPadding, int rightItemPadding) {
        RecyclerView recyclerView = (RecyclerView) getViewPager2().getChildAt(0);
        if (getViewPager2().getOrientation() == ViewPager2.ORIENTATION_VERTICAL) {
            recyclerView.setPadding(mViewPager2.getPaddingLeft(), leftItemPadding, mViewPager2.getPaddingRight(), rightItemPadding);
        } else {
            recyclerView.setPadding(leftItemPadding, mViewPager2.getPaddingTop(), rightItemPadding, mViewPager2.getPaddingBottom());
        }
        recyclerView.setClipToPadding(false);
    }