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lib/09/02/main.dart

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+import 'package:flutter/material.dart';
+
+import 'pages/page_a.dart';
+import 'pages/page_b.dart';
+import 'pages/page_c.dart';
+import 'pages/home_page.dart';
+void main() {
+  runApp(const MyApp());
+}
+
+class MyApp extends StatelessWidget {
+  const MyApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'Flutter Demo',
+      debugShowCheckedModeBanner: false,
+      theme: ThemeData(
+        appBarTheme: AppBarTheme(
+          elevation: 0,
+          iconTheme: IconThemeData(color: Colors.black),
+          titleTextStyle: TextStyle(color: Colors.black,fontSize: 18,fontWeight: FontWeight.bold)
+        )
+      ),
+      onUnknownRoute: _onUnknownRoute,
+    );
+  }
+
+  Route? _onUnknownRoute(RouteSettings settings) {
+    String? name = settings.name;
+    Widget? page ;
+    if(name=='/'){
+      page = const HomePage();
+    }
+    if(name=='/a'){
+      page = const PageA();
+    }
+    if(name=='/b'){
+      page = const PageB();
+    }
+    if(name=='/c'){
+      page = const PageC();
+    }
+    if(page!=null){
+      return MaterialPageRoute(builder: (_)=> page!,settings: settings);
+    }
+    return null;
+  }
+}