code

src/flutter/lib/main.dart

@@ -0,0 +1,25 @@
+import 'package:flutter/material.dart';
+
+import 'Screens/Home.dart';
+import 'Screens/Scan.dart';
+import 'Screens/Success.dart';
+
+void main() => runApp(App());
+
+class App extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) => MaterialApp(
+          routes: {
+            '/': (context) => Home(),
+            '/scan': (context) => Scan(),
+          },
+          onGenerateRoute: (routeSettings) {
+            var path = routeSettings.name.split('/');
+            final number = path.length > 1 ? int.parse(path[2]) : null;
+
+            return MaterialPageRoute(
+              builder: (context) => Success(result: number),
+              settings: routeSettings,
+            );
+          });
+}