Flutter change app icon

1. Go to https://icon.kitchen and design your icon. Select Circle shape. Download and unzip. In the mipmap-xxxhdpi directory under android rename the largest file to icon.png. Then copy this file to the flutter app images directory.
2. Under dev_dependencies in pubspec.yaml, add the following:

  flutter_launcher_icons: ^0.13.1

flutter_icons:
  android: 'launcher_icon'
  ios: true
  image_path: 'images/icon.png'

3.  Run the following commands:

flutter pub get
flutter pub run flutter_launcher_icons:main

4.  Run the app and verify the new icon.