fix: upgrade bug. completed by xuxiuxi

zhangzengfei

2020-03-31 0ce893695d32ab686f9e2309509e80c6feb0d380

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