Android RecyclerView设置item间距

RecyclerView没有可以直接设置间距的属性，但可以用ItemDecoration来装饰一个item，所以继承重写ItemDecoration就可以实现间距了

public class SpaceItemDecoration extends RecyclerView.ItemDecoration{  

        private int space;  

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

        @Override
        public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {  

            if(parent.getChildPosition(view) != 0)
                outRect.top = space;
        }
    }

然后在使用RecyclerView的地方：

int spacingInPixels = getResources().getDimensionPixelSize(R.dimen.space);
 mRecyclerView.addItemDecoration(new SpaceItemDecoration(spacingInPixels));

Adapter填充上，再看看item就有间距了