DividerItemDecoration分割线

1. 在drawable里面创建shape

    <shape xmlns:android="http://schemas.android.com/apk/res/android">
       <gradient
           android:centerColor="#cccfff"
           android:endColor="#ff6699"
           android:startColor="#ff9966"
           android:type="linear"/>
       <size android:height="3dp"></size>
   </shape>
   

2.在Activity里面写三句话就可以了

//设置分割线
 DividerItemDecoration dividerItemDecoration=new DividerItemDecoration(getActivity(),DividerItemDecoration.VERTICAL);
 dividerItemDecoration.setDrawable(ContextCompat.getDrawable(getActivity(),R.drawable.shape));
 rlv.addItemDecoration(dividerItemDecoration);