android recyclerView 设置item间的间距

使用场景：recyclerview要通过代码设置item间的场景

解决方案：

1.重写RecyclerView.ItemDecoration方法，代码如下：

public class SpaceItemDecoration extends RecyclerView.ItemDecoration{    private int leftRight;    private int topBottom;

 //leftRight为横向间的距离 topBottom为纵向间距离

    public SpaceItemDecoration(int leftRight, int topBottom) {        this.leftRight = leftRight;        this.topBottom = topBottom;    }    @Override    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {        super.onDraw(c, parent, state);    }    @Override    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {        LinearLayoutManager layoutManager = (LinearLayoutManager) parent.getLayoutManager();        //竖直方向的        if (layoutManager.getOrientation() == LinearLayoutManager.VERTICAL) {            //最后一项需要 bottom            if (parent.getChildAdapterPosition(view) == layoutManager.getItemCount() - 1) {                outRect.bottom = topBottom;            }            outRect.top = topBottom;            outRect.left = leftRight;            outRect.right = leftRight;        } else {            //最后一项需要right            if (parent.getChildAdapterPosition(view) == layoutManager.getItemCount() - 1) {                outRect.right = leftRight;            }            outRect.top = topBottom;            outRect.left = leftRight;            outRect.bottom = topBottom;        }    }}

2.使用方法：

第一个参数横向间距，第二个参数纵向间距，根据需求具体来看

recyclerview.addItemDecoration(new SpaceItemDecoration(0, 30));

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