<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >

    <!-- 选中状态 -->
    <item android:drawable="@drawable/annulus" android:state_checked="true" />

    <!-- 未选状态 -->
    <item android:drawable="@drawable/annulus" android:state_enabled="false" />

    <!-- 默认状态-->
    <item>
        <shape android:shape="oval">
            <stroke android:width="@dimen/dp_1" android:color="@color/white50"/>
            <size
                android:width="@dimen/dp_11"
                android:height="@dimen/dp_11" />
        </shape>
    </item>

</selector>