<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_checked="true" android:drawable="@drawable/icon_jiantou_up" />
    <item android:state_selected="true" android:drawable="@drawable/icon_jiantou_up"></item>
    <item android:state_pressed="true" android:drawable="@drawable/icon_jiantou_up"></item>
    <item android:state_checked="false" android:drawable="@drawable/icon_jiantou_down" />
</selector>