Flutter writes an android bottom navigation bar framework

Without further ado, let's go to the code:

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Bottom Navigation Bar',
      theme: ThemeData(
        primaryColor: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _currentIndex = 0;

  final List<Widget> _pages = [
    HomePage(),
    SearchPage(),
    ProfilePage(),
  ];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Bottom Navigation Bar'),
      ),
      body: _pages[_currentIndex],
      bottomNavigationBar: BottomNavigationBar(
        currentIndex: _currentIndex,
        onTap: (index) {
          setState(() {
            _currentIndex = index;
          });
        },
        items: [
          BottomNavigationBarItem(
            icon: Icon(Icons.home),
            label: 'Home',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.search),
            label: 'Search',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.person),
            label: 'Profile',
          ),
        ],
      ),
    );
  }
}

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Text('Home Page'),
    );
  }
}

class SearchPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Text('Search Page'),
    );
  }
}

class ProfilePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Text('Profile Page'),
    );
  }
}

In the above example, we created a MyHomePagewidget which is StatefulWidget. MyHomePageContains bottom navigation bar and related page content. Through BottomNavigationBarthe and currentIndexproperties, we can control the currently selected navigation item and onTapupdate the state in the callback.

In itemsthe properties we set three BottomNavigationBarItem, each with an icon and label. When the user toggles the navigation item, onTapthe callback updates currentIndexthe value, which is then used to display the corresponding page.

In the example, we created three simple pages ( HomePage, , SearchPageand ProfilePage) that you can customize the content of these pages according to your needs.

Hope this example helps you!