How To Set Up Tabbar With Example In Flutter Android App

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: DefaultTabController(
        length: 3,
        child: Scaffold(
          appBar: AppBar(
            bottom: TabBar(
              tabs: [
                new Tab(icon: new Icon(Icons.home), text: 'Tab 1',),
                new Tab(icon: new Icon(Icons.person), text: 'Tab 2',),
                new Tab(icon: new Icon(Icons.book), text: 'Tab 3',),
              ],
            ),
            centerTitle: true,
            title: Text('TabBar'),
            backgroundColor: Colors.black,
          ),
          body: TabBarView(
            children: [
              FirstScreen(),
              SecondScreen(),
              ThirdScreen()
            ],
          ),
        ),
      ),
    );
  }
}

class FirstScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        debugShowCheckedModeBanner: false,
        home: Scaffold(
            body: Center(
                child:
                Text('First Screen Tab',
                  style: TextStyle(fontSize: 20),)
            )
        )
    );
  }
}

class SecondScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        debugShowCheckedModeBanner: false,
        home: Scaffold(
            body: Center(
                child:
                Text('Second Screen Tab',
                  style: TextStyle(fontSize: 20),)
            )
        )
    );
  }
}

class ThirdScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        debugShowCheckedModeBanner: false,
        home: Scaffold(
            body: Center(
                child:
                Text('Third Screen Tab',
                  style: TextStyle(fontSize: 20),)
            )
        )
    );
  }
}