RecycleView中网格形式的间隙设置方法

stackoverflow中针对这个问题的讨论

RecycleView 可以通过设置不同的布局管理器来达到ListView,GridView 等不同的展现形式. 但是在使用GridLayoutManager时,想要达到GridView中设置水平竖直间隙,需要添加ItemDecoration来实现. 下面是比较好的一种效果的实现代码:

public class SpaceItemDecoration extends RecyclerView.ItemDecoration {
    private int spacing;
    private int spanCount;
    public SpaceItemDecoration(int spanCount, int spacing) {
        this.spanCount = spanCount;
        this.spacing = spacing;
    }

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

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

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

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