Persisent navbar

lib/main.dart

@@ -1,27 +1,87 @@
 import 'package:firebase_core/firebase_core.dart';
 import 'package:flutter/material.dart';
 import 'package:ruswipeshare/home.dart';
+import 'package:ruswipeshare/sell.dart';
 
 import 'firebase_options.dart';
 import 'authGate.dart';
 
 void main() async {
-   WidgetsFlutterBinding.ensureInitialized();
- await Firebase.initializeApp(
-   options: DefaultFirebaseOptions.android,
- );
+//    WidgetsFlutterBinding.ensureInitialized();
+//  await Firebase.initializeApp(
+//    options: DefaultFirebaseOptions.android,
+//  );
   runApp(const MyApp());
 }
 
 class MyApp extends StatelessWidget {
- const MyApp({super.key});
- @override
- Widget build(BuildContext context) {
-   return MaterialApp(
-     theme: ThemeData(
-       primarySwatch: Colors.blue,
-     ),
-     home: const AuthGate(),
-   );
- }
+  const MyApp({super.key});
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      theme: ThemeData(
+        primarySwatch: Colors.blue,
+      ),
+      home: const HomeScreen(),
+    );
+  }
+}
+
+class MyNavBar extends StatefulWidget {
+  MyNavBar({super.key});
+
+  @override
+  State<MyNavBar> createState() => MyNavBarState();
+}
+
+class MyNavBarState extends State<MyNavBar> {
+  final pages = [
+    const SellScreen(),
+    const SellScreen(),
+  ];
+
+  int _selectedIndex = 0;
+
+  void _onItemTapped(int index) {
+    if (runtimeType == pages.elementAt(index).runtimeType) return;
+
+    setState(() {
+      _selectedIndex = index;
+    });
+
+    Navigator.push(
+      context,
+      MaterialPageRoute(builder: (context) => pages.elementAt(index)),
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return BottomNavigationBar(
+      type: BottomNavigationBarType.fixed,
+      backgroundColor: Colors.red,
+      selectedItemColor: Colors.black,
+      unselectedItemColor: Colors.black54,
+      items: const <BottomNavigationBarItem>[
+        BottomNavigationBarItem(
+          icon: Icon(Icons.shopping_cart),
+          label: 'Buy',
+        ),
+        BottomNavigationBarItem(
+          icon: Icon(Icons.attach_money),
+          label: 'Sell',
+        ),
+        BottomNavigationBarItem(
+          icon: Icon(Icons.person),
+          label: 'Profile',
+        ),
+        BottomNavigationBarItem(
+          icon: Icon(Icons.settings),
+          label: 'Settings',
+        ),
+      ],
+      currentIndex: _selectedIndex,
+      onTap: _onItemTapped,
+    );
+  }
 }