<selector xmlns:android="http://schemas.android.com/apk/res/android">  

  <item android:state_enabled="true">
        <shape>
            <gradient android:startColor="#0000FF" android:endColor="#0000FF"/>
            <corners android:radius="5dip" />        
        </shape>
    </item>
    <item android:state_enabled="false">
        <shape>
            <gradient android:startColor="#DDDDDD" android:endColor="#EEEEEE"/>
            <corners android:radius="15dip" />        
        </shape>
    </item>
</selector>