Selector选择器

<?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/ic_top_tab_right_highlighted"></item>
<item android:drawable="@drawable/ic_top_tab_right_normal"></item>
</selector>