| // Copyright 2014 The Flutter Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| import 'package:flutter/material.dart'; |
| |
| /// Flutter code sample for [BottomNavigationBar]. |
| |
| void main() => runApp(const BottomNavigationBarExampleApp()); |
| |
| class BottomNavigationBarExampleApp extends StatelessWidget { |
| const BottomNavigationBarExampleApp({super.key}); |
| |
| @override |
| Widget build(BuildContext context) { |
| return const MaterialApp( |
| home: BottomNavigationBarExample(), |
| ); |
| } |
| } |
| |
| class BottomNavigationBarExample extends StatefulWidget { |
| const BottomNavigationBarExample({super.key}); |
| |
| @override |
| State<BottomNavigationBarExample> createState() => _BottomNavigationBarExampleState(); |
| } |
| |
| class _BottomNavigationBarExampleState extends State<BottomNavigationBarExample> { |
| int _selectedIndex = 0; |
| static const TextStyle optionStyle = TextStyle(fontSize: 30, fontWeight: FontWeight.bold); |
| static const List<Widget> _widgetOptions = <Widget>[ |
| Text( |
| 'Index 0: Home', |
| style: optionStyle, |
| ), |
| Text( |
| 'Index 1: Business', |
| style: optionStyle, |
| ), |
| Text( |
| 'Index 2: School', |
| style: optionStyle, |
| ), |
| ]; |
| |
| void _onItemTapped(int index) { |
| setState(() { |
| _selectedIndex = index; |
| }); |
| } |
| |
| @override |
| Widget build(BuildContext context) { |
| return Scaffold( |
| appBar: AppBar( |
| title: const Text('BottomNavigationBar Sample'), |
| ), |
| body: Center( |
| child: _widgetOptions.elementAt(_selectedIndex), |
| ), |
| bottomNavigationBar: BottomNavigationBar( |
| items: const <BottomNavigationBarItem>[ |
| BottomNavigationBarItem( |
| icon: Icon(Icons.home), |
| label: 'Home', |
| ), |
| BottomNavigationBarItem( |
| icon: Icon(Icons.business), |
| label: 'Business', |
| ), |
| BottomNavigationBarItem( |
| icon: Icon(Icons.school), |
| label: 'School', |
| ), |
| ], |
| currentIndex: _selectedIndex, |
| selectedItemColor: Colors.amber[800], |
| onTap: _onItemTapped, |
| ), |
| ); |
| } |
| } |