android recyclerview分割线

使用recyclerview的时候难免要添加分割线，但是它又不像listview一样可以 在xml文件里面直接添加属性就可以方便修改。

reycclerview需要我们自己写,mRecyclerView.addItemDecoration(ItemDecoration decor)属性，不同列表又有不同分割线样式，这样就需要自己重新定义一个分割线类。

public class SpacesItemDecoration extends RecyclerView.ItemDecoration {

    private int space;

    public SpacesItemDecoration(int space) {
        this.space = space;
    }

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

        //根据item位置设置边距值
        if (parent.getChildAdapterPosition(view) % 2 == 0) {
            outRect.bottom = 0;
            outRect.left = 0;
        }
        if (parent.getChildAdapterPosition(view) % 2 == 1) {
            outRect.bottom = 0;
            outRect.right = 0;
            outRect.left = 0;
        }
        if (parent.getChildAdapterPosition(view) == 0 || parent.getChildAdapterPosition(view) == 1) {
            outRect.top = 0;
        }
    }
           

效果如下：