How To Create Tabbar Badge Using Flutter Android App

dependencies:
  flutter:
    sdk: flutter
  badges: ^1.1.4

flutter pub get

import 'package:badges/badges.dart';

import 'package:badges/badges.dart';
import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      theme: _buildTheme(),
      home: HomeScreen(),
    );
  }
}

ThemeData _buildTheme() {
  final ThemeData base = ThemeData.light();
  return base.copyWith(
      primaryIconTheme: base.iconTheme.copyWith(color: Colors.black));
}

class HomeScreen extends StatefulWidget {
  @override
  _HomeScreenState createState() => _HomeScreenState();
}

class _HomeScreenState extends State<HomeScreen> {
  int _counter = 0;
  bool showRaisedButtonBadge = true;

  @override
  Widget build(BuildContext context) {
    return DefaultTabController(
      length: 2,
      child: Scaffold(
        appBar: AppBar(
          title: Text('Tabbar Badge', style: TextStyle(color: Colors.black)),
          backgroundColor: Colors.white,
          actions: <Widget>[
          ],
          bottom: _tabBar(),
        ),
        body: Column(
          children: <Widget>[
            _addRemoveCartButtons(),
          ],
        ),
      ),
    );
  }

  Widget expandedBadge() {
    return Expanded(
      child: Center(
        child: Badge(
          badgeContent: Text('10'),
          child: Icon(Icons.person, size: 30),
        ),
      ),
    );
  }


  Widget _tabBar() {
    return TabBar(tabs: [
      Tab(
        icon:Badge(
          badgeColor: Colors.indigo,
          position: BadgePosition.topEnd(top: 0, end: 3),
          animationDuration: Duration(milliseconds: 300),
          animationType: BadgeAnimationType.slide,
          badgeContent: Text(
            _counter.toString(),
            style: TextStyle(color: Colors.white),
          ),
          child: IconButton(icon: Icon(Icons.music_note,color: Colors.black,),
              onPressed: () {}),
        )
      ),
      Tab(
        icon: Badge(
          badgeColor: Colors.indigo,
          shape: BadgeShape.square,
          borderRadius: BorderRadius.circular(5),
          position: BadgePosition.topEnd(top: -12, end: -20),
          padding: EdgeInsets.all(2),
          badgeContent: Text(
            'NEW',
            style: TextStyle(
                color: Colors.white, fontSize: 10, fontWeight: FontWeight.bold),
          ),
          child: Text(
            'MUSIC',
            style: TextStyle(color: Colors.grey[600]),
          ),
        ),
      ),
    ]);
  }



  Widget _addRemoveCartButtons() {
    return Padding(
      padding: const EdgeInsets.all(8.0),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.center,
        mainAxisAlignment: MainAxisAlignment.spaceEvenly,
        children: <Widget>[
          RaisedButton.icon(
            textColor: Colors.white,
            color: Colors.indigo,
              onPressed: () {
                setState(() {
                  _counter++;
                });
              },
              icon: Icon(Icons.add,color: Colors.white),
              label: Text('Add to cart',)),
          RaisedButton.icon(
              textColor: Colors.white,
              color: Colors.indigo,
              onPressed: () {
                if (_counter > 0) {
                  setState(() {
                    _counter--;
                  });
                }
              },
              icon: Icon(Icons.remove,color: Colors.white),
              label: Text('Remove cart')),
        ],
      ),
    );
  }
}