<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    
    <!-- 背景圆环 -->
    <item>
        <shape android:shape="ring"
            android:innerRadius="25dp"
            android:thickness="6dp"
            android:useLevel="false">
            <stroke android:width="6dp" android:color="#E0E0E0" />
        </shape>
    </item>
    
    <!-- 前景动画 -->
    <item>
        <shape android:shape="ring"
            android:innerRadius="25dp"
            android:thickness="6dp"
            android:useLevel="true">
            <stroke android:width="6dp" android:color="#2196F3" />
        </shape>
    </item>
    
</layer-list>
