1.In pubspec.yaml

dev_dependencies: flutter_launcher_icons: "^0.14.3"

flutter_launcher_icons: android: "launcher_icon" ios: true image_path: "assets/icon/icon.png" min_sdk_android: 21 # android min sdk min:16, default 21

2. In the TERMINAL: 2.1 : flutter clean 2.2 : flutter pub get 2.3 : flutter pub add flutter_launcher_icons 2.4 : flutter pub run flutter_launcher_icons