在RecyclerView GridLayout中防止子对象之间出现双倍间距

public class GridSpacingItemDecoration extends RecyclerView.ItemDecoration {
    private int spanCount;
    private int spacing;
    private boolean includeEdge;

    public GridSpacingItemDecoration(int spanCount, int spacing, boolean includeEdge) {
        this.spanCount = spanCount;
        this.spacing = spacing;
        this.includeEdge = includeEdge;
    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        int position = parent.getChildAdapterPosition(view); // 获取子项的位置
        int column = position % spanCount; // 计算子项所在列数

        if (includeEdge) {
            outRect.left = spacing - column * spacing / spanCount; // 左边间距
            outRect.right = (column + 1) * spacing / spanCount; // 右边间距
            if (position < spanCount) {
                outRect.top = spacing; // 第一行顶部间距
            }
            outRect.bottom = spacing; // 底部间距
        } else {
            outRect.left = column * spacing / spanCount; // 左边间距
            outRect.right = spacing - (column + 1) * spacing / spanCount; // 右边间距
            if (position >= spanCount) {
                outRect.top = spacing; // 顶部间距
            }
        }
    }
}

int spanCount = 2; // 列数
int spacing = 10; // 间距
boolean includeEdge = false; // 是否包含边缘

GridSpacingItemDecoration itemDecoration = new GridSpacingItemDecoration(spanCount, spacing, includeEdge);
recyclerView.addItemDecoration(itemDecoration);