<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- 选中状态 -->
    <item android:drawable="@drawable/tab_selected_bg" android:state_selected="true" />
    <!-- 未选中状态 -->
    <item android:drawable="@drawable/tab_unselected_bg" android:state_selected="false" />
</selector>