use adaptive launcher icon :-/

src/main/AndroidManifest.xml

@@ -52,7 +52,7 @@
     <application
         android:allowBackup="true"
         android:appCategory="social"
-        android:icon="@drawable/ic_launcher"
+        android:icon="@mipmap/new_launcher"
         android:label="@string/app_name"
         android:networkSecurityConfig="@xml/network_security_configuration"
         android:theme="@style/ConversationsTheme"

src/main/java/eu/siacs/conversations/services/AvatarService.java

@@ -115,7 +115,7 @@ public class AvatarService implements OnAdvancedStreamFeaturesLoaded {
 		BitmapFactory.Options opts = new BitmapFactory.Options();
 		opts.inSampleSize = 2;
 		Resources resources = mXmppConnectionService.getResources();
-		Bitmap icon = BitmapFactory.decodeResource(resources, R.drawable.ic_launcher, opts);
+		Bitmap icon = BitmapFactory.decodeResource(resources, R.mipmap.new_launcher_round, opts);
 		paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_OVER));
 
 		int iconSize = Math.round(canvas.getHeight() / 2.6f);

src/main/res/drawable/ic_launcher_foreground.xml

@@ -0,0 +1,24 @@
+<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="1163.6364"
+        android:viewportHeight="1163.6364">
+    <group android:translateX="325.81818"
+            android:translateY="325.81818">
+      <path
+          android:pathData="M253.219,17.719C126.144,17.719 22.469,118.884 22.469,243.75C22.469,368.616 126.138,469.844 253.219,469.844C292.739,469.844 323.216,461.736 358,449.094L468.469,493.625A14.556,14.562 0,0 0,488.063 476.625L458.125,355.656C477.356,321.886 483.938,283.416 483.938,243.75C483.938,118.887 380.293,17.719 253.219,17.719zM143.844,222C157.651,222 168.844,233.193 168.844,247C168.844,260.807 157.651,272 143.844,272C130.037,272 118.844,260.807 118.844,247C118.844,233.193 130.037,222 143.844,222zM253.563,222C267.37,222 278.563,233.193 278.563,247C278.563,260.807 267.37,272 253.563,272C239.755,272 228.563,260.807 228.563,247C228.563,233.193 239.755,222 253.563,222zM363.563,222C377.37,222 388.563,233.193 388.563,247C388.563,260.807 377.37,272 363.563,272C349.755,272 338.563,260.807 338.563,247C338.563,233.193 349.755,222 363.563,222z"
+          android:fillColor="#ffffff"
+          android:strokeColor="#00000000"
+          android:fillAlpha="1"/>
+      <path
+          android:pathData="M478.641,484.856 L447.361,358.245c19.89,-31.998 26.743,-69.572 26.743,-109.762 0,-116.817 -96.799,-211.484 -216.184,-211.484 -119.384,0 -216.184,94.667 -216.184,211.484 0,116.817 96.799,211.554 216.184,211.554 39.636,0 68.588,-8.142 105.194,-21.761z"
+          android:strokeAlpha="0"
+          android:strokeLineJoin="round"
+          android:strokeWidth="23.55835724"
+          android:fillColor="#00000000"
+          android:strokeColor="#000000"
+          android:fillAlpha="0"
+          android:strokeLineCap="butt"/>
+    </group>
+</vector>

src/main/res/mipmap-anydpi-v26/new_launcher.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@mipmap/ic_launcher_background"/>
+    <foreground android:drawable="@drawable/ic_launcher_foreground"/>
+</adaptive-icon>

src/main/res/mipmap-anydpi-v26/new_launcher_round.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@mipmap/ic_launcher_background"/>
+    <foreground android:drawable="@drawable/ic_launcher_foreground"/>
+</adaptive-icon>