<?xml version="1.0" encoding="utf-8"?>
<!-- 底层下滑条的样式选择器，可控制Switch在不同状态下，底下下滑条的颜色 -->
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:state_checked="true"  android:drawable="@drawable/superplayer_green_track" />
<item                               android:drawable="@drawable/superplayer_gray_track" />

</selector>
