ExpandableListView中组item的默认icon如何让更改？

Question

如图，这是2.2中默认的组icon，不太好看，怎么更改啊？

Answer 1

定义一个expandablelistviewselector.xml：
 
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_expanded="true" android:drawable="@drawable/expandablelistviewindicatordown" />
    <item android:drawable="@drawable/expandablelistviewindicator" />
</selector>   程序的主体部分编写类似如下的代码： expandList.setGroupIndicator(this.getResources().getDrawable(R.layout.expandablelistviewselector));