App Icon
To change your app icon follow the steps below:
Step 1
Add your logo to "assets/images" (replace app_icon.png and app_icon_dark.png)
Step 2
Open pubspec.yaml and change the edit the image_path in this way "assets/images/your_icon_name.png" (or jpg depending on your icon)
Step 3
Open the Terminal from the bottom of the screen
And execute the below commands in the terminal
flutter pub get
flutter pub pub run flutter_launcher_icons:main
After that, your icon will be updated