RecyclerView设置分隔线

添加默认分割线：高度为2px，颜色为灰色

recycleview.addItemDecoration(new DividerItemDecoration(getContext(), DividerItemDecoration.VERTICAL););

添加自定义分割线：可自定义分割线drawable

DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(getContext(), DividerItemDecoration.VERTICAL);
dividerItemDecoration.setDrawable(new ColorDrawable(Color.parseColor("#F5F5F5")));
recycleview.addItemDecoration(dividerItemDecoration);

参考：

https://blog.csdn.net/yancychas/article/details/77484659?locationNum=10&fps=1&utm_medium=distribute.pc_relevant.none-task-blog-baidujs_title-0&spm=1001.2101.3001.4242