Navigaton Bar without state restoration

bottom_nav_bar.dart

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: HomePage(),
    );
  }
}

class HomePage extends StatefulWidget {
  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  int _index = 0;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(child: Text('Index is ${_index}')),
      bottomNavigationBar: BottomNavigationBar(
        currentIndex: _index,
        onTap: (i) => setState(() => _index = i),
        items: <BottomNavigationBarItem>[
          BottomNavigationBarItem(
            icon: Icon(Icons.home),
            label: 'Home'
          ),
          BottomNavigationBarItem(
              icon: Icon(Icons.notifications),
              label: 'Notifications'
          ),
          BottomNavigationBarItem(
              icon: Icon(Icons.settings),
              label: 'Settings'
          ),
        ],
      ),
    );
  }
}