import 'package:flutter/material.dart';

void main() {
    runApp(MyApp());
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
    int _tabIndex = 0;

    @override
    Widget build(BuildContext context) {
        return MaterialApp(
            home: Scaffold(
                appBar: AppBar(
                    title: Text("Welcome to Flutter!!"),
                ),
                bottomNavigationBar: BottomNavigationBar(
                    items: [
                        BottomNavigationBarItem(title: Text("Home"), icon: Icon(Icons.home)),
                        BottomNavigationBarItem(title: Text("List"), icon: Icon(Icons.list))
                    ],

                    currentIndex: _tabIndex,
          onTap: (index) {
            setState(() {
              _tabIndex = index;
            });
            print(_tabIndex);
          },
                ),
            ),
        );
    }
}