shape.xml

xx

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
   <gradient 
       android:startColor="#00000000"
       android:centerColor="#000000"
       android:endColor="#00000000"
       />
   <corners 
       android:radius="4dp"
       />
</shape>

oo

在ListView中这样设置(xml)：

oo

  android:divider="@drawable/shape"
  android:dividerHeight="2dp"

xx