如何将网格RecyclerView项居中？

// 创建GridLayoutManager并设置spanCount
GridLayoutManager layoutManager = new GridLayoutManager(context, spanCount);
recyclerView.setLayoutManager(layoutManager);

// 创建自定义的ItemDecoration类
RecyclerView.ItemDecoration itemDecoration = new RecyclerView.ItemDecoration() {
    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        // 计算每个网格项的偏移量，使其居中
        int totalWidth = parent.getWidth();
        int itemWidth = totalWidth / spanCount;
        int padding = (totalWidth - itemWidth * spanCount) / 2;
        outRect.left = padding;
        outRect.right = padding;
    }

    @Override
    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
        // 绘制分割线，实现网格项的居中效果
        int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            View child = parent.getChildAt(i);
            RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
            int left = child.getLeft() - params.leftMargin;
            int right = child.getRight() + params.rightMargin;
            int top = child.getBottom() + params.bottomMargin;
            int bottom = top + dividerHeight;
            dividerDrawable.setBounds(left, top, right, bottom);
            dividerDrawable.draw(c);
        }
    }
};

// 将自定义的ItemDecoration类应用到RecyclerView中
recyclerView.addItemDecoration(itemDecoration);