Bottom Navigation Bar
A BottomNavigationBar widget can be displayed at the bottom of the app to select among the small number of views.
A bottom navigation bar which is basically used in the Scaffold Widget, that’s why it is provided as the Scaffold.bottom navigation bar argument.
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
/// This Widget is the main application widget.
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: MyNavigationBar (),
);
}
}
class MyNavigationBar extends StatefulWidget {
MyNavigationBar ({Key key}) : super(key: key);
@override
_MyNavigationBarState createState() => _MyNavigationBarState();
}
class _MyNavigationBarState extends State {
int _selectedIndex = 0;
static const List _widgetOptions = [
Text('Home Page', style: TextStyle(fontSize: 35, fontWeight: FontWeight.bold)),
Text('Search Page', style: TextStyle(fontSize: 35, fontWeight: FontWeight.bold)),
Text('Profile Page', style: TextStyle(fontSize: 35, fontWeight: FontWeight.bold)),
];
void _onItemTapped(int index) {
setState(() {
_selectedIndex = index;
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Flutter BottomNavigationBar Example'),
backgroundColor: Colors.green
),
body: Center(
child: _widgetOptions.elementAt(_selectedIndex),
),
bottomNavigationBar: BottomNavigationBar(
items: const [
BottomNavigationBarItem(
icon: Icon(Icons.home),
title: Text('Home'),
backgroundColor: Colors.green
),
BottomNavigationBarItem(
icon: Icon(Icons.search),
title: Text('Search'),
backgroundColor: Colors.yellow
),
BottomNavigationBarItem(
icon: Icon(Icons.person),
title: Text('Profile'),
backgroundColor: Colors.blue,
),
],
type: BottomNavigationBarType.shifting,
currentIndex: _selectedIndex,
selectedItemColor: Colors.black,
iconSize: 40,
onTap: _onItemTapped,
elevation: 5
),
);
}
}
Example
