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<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape android:shape="rectangle">
<corners android:bottomLeftRadius="16dp" android:bottomRightRadius="16dp" android:topLeftRadius="16dp" android:topRightRadius="16dp"></corners>
<stroke android:width="1dp" android:color="#999999"></stroke>
<solid android:color="#fefefe"></solid>
</shape>
</item>
<item android:state_selected="true">
<shape android:shape="rectangle">
<corners android:bottomLeftRadius="17dp" android:bottomRightRadius="17dp" android:topLeftRadius="17dp" android:topRightRadius="17dp"></corners>
<stroke android:width="1dp" android:color="#999999"></stroke>
<solid android:color="#cccccc"></solid>
</shape>
</item>
<item android:state_pressed="true">
<shape android:shape="rectangle">
<corners android:bottomLeftRadius="17dp" android:bottomRightRadius="17dp" android:topLeftRadius="17dp" android:topRightRadius="17dp"></corners>
<stroke android:width="1dp" android:color="#999999"></stroke>
<solid android:color="#cccccc"></solid>
</shape>
</item>
</selector>
//上面的selector是不能生效的！！！！
//正确的案例如下：【原因是顺序问题】
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_selected="true">
<shape android:shape="rectangle">
<corners android:bottomLeftRadius="17dp" android:bottomRightRadius="17dp" android:topLeftRadius="17dp" android:topRightRadius="17dp"></corners>
<stroke android:width="1dp" android:color="#999999"></stroke>
<solid android:color="#cccccc"></solid>
</shape>
</item>
<item android:state_pressed="true">
<shape android:shape="rectangle">
<corners android:bottomLeftRadius="17dp" android:bottomRightRadius="17dp" android:topLeftRadius="17dp" android:topRightRadius="17dp"></corners>
<stroke android:width="1dp" android:color="#999999"></stroke>
<solid android:color="#cccccc"></solid>
</shape>
</item>
//位置应该放在最底部，保证上面的效果不被覆盖
<item>
<shape android:shape="rectangle">
<corners android:bottomLeftRadius="16dp" android:bottomRightRadius="16dp" android:topLeftRadius="16dp" android:topRightRadius="16dp"></corners>
<stroke android:width="1dp" android:color="#999999"></stroke>
<solid android:color="#fefefe"></solid>
</shape>
</item>
</selector>
