A new Flutter project.
create image from this web
https://romannurik.github.io/AndroidAssetStudio/icons-launcher.html#foreground.space.trim=1&foreground.space.pad=-0.05&foreColor=rgba(96%2C%20125%2C%20139%2C%200)&backColor=rgb(68%2C%20138%2C%20255)&crop=0&backgroundShape=circle&effects=none&name=ic_launcher
add flutter_launcher_icons dependency and add image at assets/icon
then run this command
flutter pub run flutter_launcher_icons:main
flutterfire configure