fixed things and icon

pubspec.yaml

@@ -50,6 +50,8 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
+  change_app_package_name: ^1.5.0
+  flutter_launcher_icons: ^0.14.4
 
   # The "flutter_lints" package below contains a set of recommended lints to
   # encourage good coding practices. The lint set provided by the package is
@@ -103,3 +105,13 @@ flutter:
   #
   # For details regarding fonts from package dependencies,
   # see https://flutter.dev/to/font-from-package
+
+flutter_launcher_icons:
+  android: true
+  ios: true
+  image_path: "assets/icon/app_icon.png"
+  # Adaptive icon Android: sfondo bianco + soggetto in primo piano.
+  adaptive_icon_background: "#FFFFFF"
+  adaptive_icon_foreground: "assets/icon/app_icon.png"
+  # iOS non ammette trasparenza: rimuove il canale alpha automaticamente.
+  remove_alpha_ios: true