在Android中填充StaggeredGridlayoutManager的空白颜色

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

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

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        int position = parent.getChildAdapterPosition(view);
        int column = position % spanCount;

        if (includeEdge) {
            outRect.left = spacing - column * spacing / spanCount;
            outRect.right = (column + 1) * spacing / spanCount;

            if (position < spanCount) {
                outRect.top = spacing;
            }
            outRect.bottom = spacing;
        } else {
            outRect.left = column * spacing / spanCount;
            outRect.right = spacing - (column + 1) * spacing / spanCount;
            if (position >= spanCount) {
                outRect.top = spacing;
            }
        }
    }
}

int spacing = getResources().getDimensionPixelSize(R.dimen.spacing);
int spanCount = 2; // 每行或每列的项数
boolean includeEdge = true; // 是否包含边缘

StaggeredGridSpacingItemDecoration decoration = new StaggeredGridSpacingItemDecoration(spacing, spanCount, includeEdge);
recyclerView.addItemDecoration(decoration);