DART

flutter launcher icon generate

dev_dependencies:
  flutter_launcher_icons: ^0.8.1
flutter_icons:
  android: true
  ios: true
  image_path: "assets/icon/icon.png"
  
 then
 cmd ->flutter pub run flutter_launcher_icons:main

flutter launcher icon

dependencies:
  flutter_launcher_icons: ^0.8.0

Launcher icon Flutter

A command-line tool that simplifies the task of updating your Flutter app's launcher icon. Full flexibility allows you to only update the launcher icon for specific platforms as needed.
use the following package.

icons_launcher: any

or

flutter_launcher_icons: any

dev_dependencies:
  flutter_native_splash: ^1.2.0

flutter_native_splash:
  image: assets/logo.png
  color: "#fafafa"

flutter pub run flutter_native_splash:create

flutter pub run flutter_native_splash:remove