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fixed：selector会从上往下选择状态，哪个先符合就先选哪个。

问题代码：
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
//默认状态放在了第一行，所以不会起作用
<item android:drawable="@drawable/unselected" android:state_checked="false"/>
<item android:drawable="@drawable/selected" android:state_selected="true" />
<item android:drawable="@drawable/selected" android:state_checked="true" />
</selector>
修正后代码：
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:drawable="@drawable/selected" android:state_selected="true" />
<item android:drawable="@drawable/selected" android:state_checked="true" />
<item android:drawable="@drawable/unselected" android:state_checked="false"/>
</selector>