archy/Android/app/src/main/res/drawable/ic_launcher_background.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Dark fill + the metallic ring at the circle's edge. The ring is in the
     BACKGROUND because the background renders out to the visible mask edge,
     whereas the foreground is cropped to the inner safe zone (which kept
     clipping the ring). Scale ~0.95 puts it right at the dark circle's rim. -->
<vector xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:aapt="http://schemas.android.com/aapt"
    android:width="108dp"
    android:height="108dp"
    android:viewportWidth="752"
    android:viewportHeight="752">

    <path
        android:fillColor="#0A0A0A"
        android:pathData="M0,0h752v752H0z" />

    <group
        android:pivotX="376"
        android:pivotY="376"
        android:scaleX="0.95"
        android:scaleY="0.95">
        <path
            android:fillColor="#00000000"
            android:strokeWidth="26"
            android:pathData="M11.441,375.669a364.227,364.227 0 1,0 728.454,0a364.227,364.227 0 1,0 -728.454,0z">
            <aapt:attr name="android:strokeColor">
                <gradient
                    android:type="linear"
                    android:startX="751.337"
                    android:startY="751.338"
                    android:endX="0"
                    android:endY="0">
                    <item android:offset="0" android:color="#FF666666" />
                    <item android:offset="1" android:color="#FFC0C0C0" />
                </gradient>
            </aapt:attr>
        </path>
    </group>
</vector>