Swipeable Top Tab Navigation View 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(
            backgroundColor: Color(0xFF0D47A1),
            bottom: TabBar(
              tabs: [
                Tab(text: 'FIRST Tab'),
                Tab(text: 'SECOND Tab',),
                Tab(text: 'THIRD Tab'),
              ],
            ),
            title: Text('TABS TITLE TEXT'),
          ),
          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 Activity Screen',
                  style: TextStyle(fontSize: 21),)
            )
        )
    );
  }
}
class SecondScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        debugShowCheckedModeBanner: false,
        home: Scaffold(
            body: Center(
                child:
                Text('Second Activity Screen',
                  style: TextStyle(fontSize: 21),)
            )
        )
    );
  }
}
class ThirdScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        debugShowCheckedModeBanner: false,
        home: Scaffold(
            body: Center(
                child:
                Text('Third Activity Screen',
                  style: TextStyle(fontSize: 21),)
            )
        )
    );
  }
}