RecyclerVIew中使用GridLayoutManger的装饰间距和跨度

// 自定义ItemDecoration类
public class GridSpacingItemDecoration extends RecyclerView.ItemDecoration {
    private int spacing;

    public GridSpacingItemDecoration(int spacing) {
        this.spacing = spacing;
    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        outRect.left = spacing;
        outRect.right = spacing;
        outRect.bottom = spacing;

        // Add top margin only for the first item to avoid double spacing between items
        if (parent.getChildAdapterPosition(view) == 0) {
            outRect.top = spacing;
        } else {
            outRect.top = 0;
        }
    }
}

// 使用GridLayoutManger的地方
RecyclerView recyclerView = findViewById(R.id.recyclerView);
GridLayoutManager layoutManager = new GridLayoutManager(this, 2);
recyclerView.setLayoutManager(layoutManager);

int spacing = getResources().getDimensionPixelSize(R.dimen.grid_spacing);
recyclerView.addItemDecoration(new GridSpacingItemDecoration(spacing));