设置 listview 滚动条样式

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
    <gradient android:angle="45" android:endColor="#FF3401" android:centerColor="#ff5c33" android:startColor="#FF3401" />       

    <corners android:radius="8dp" />
    <size android:width="4dp"/>
    <padding android:left="0.5dp" android:right="0.5dp" />    </shape>

android:scrollbarSize="10dp"
android:scrollbarThumbVertical="@drawable/custom_scroll_style"