android shape 圆环的两种实现

-------------------- 1 用 stroke 描边来实现 ------------------------------------
<shape android:shape="oval">
    <stroke android:width="2dp" android:color="#b8c1d1" />
    <solid android:color="#ffffff" />
    <size android:width="12dp" android:height="12dp" />
</shape>

-------------------- 2 用 layer-list 叠加来实现 ------------------------------------

<layer-list>
    <item>
        <shape android:shape="oval">
            <solid android:color="#c5cedb" />
            <size android:width="70dp" android:height="70dp" />
        </shape>
    </item>
    <item android:bottom="17dp" android:left="17dp" android:right="17dp" android:top="17dp">
        <shape android:shape="oval">
            <solid android:color="@color/white" />
            <size android:width="70dp" android:height="70dp" />
        </shape>
    </item>
</layer-list>

stroke