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

<?xml version="1.0" encoding="utf-8"?>
<!-- Plain dark tile. The badge (single SVG-matched ring + grid) is in the
     foreground so there's exactly one ring. -->
<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="108dp"
    android:height="108dp"
    android:viewportWidth="108"
    android:viewportHeight="108">
    <path
        android:fillColor="#0A0A0A"
        android:pathData="M0,0h108v108H0z" />
</vector>