通过shape绘制一个多层圆点，第一层背景主要用来当作外层描边，第二层是粗描边和内圆颜色

round_point.xml

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:gravity="center">
        <shape android:shape="oval">
            <solid android:color="@color/colorPrimaryDark" />
        </shape>
    </item>
    <item
        android:bottom="1dp"
        android:gravity="center"
        android:left="1dp"
        android:right="1dp"
        android:top="1dp">
        <shape android:shape="oval">
            <solid android:color="@color/colorAccent" />
            <stroke
                android:width="2dp"
                android:color="@android:color/white" />
        </shape>
    </item>
</layer-list>