How To Make Appbar Cart Badge With Flutter In Android

dependencies:
  flutter:
    sdk: flutter

  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^0.1.2
  badges: ^1.1.1

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(
          leading: Badge(
            position: BadgePosition.topRight(top: 10, right: 10),
            badgeContent: null,
            child: IconButton(
              icon: Icon(Icons.menu),
              onPressed: () {},
            ),
          ),
          title: Text('Badge Notification', style: TextStyle(color: Colors.black)),
          centerTitle: true,
          backgroundColor: Colors.white,
          actions: <Widget>[
            _shoppingCartBadge(),

          ],
        ),
        body: Column(
          children: <Widget>[
            _productImage(),
            _addRemoveCartButtons(),
          ],
        ),
      ),
    );
  }


  Widget _shoppingCartBadge() {
    return Badge(
      position: BadgePosition.topRight(top: 0, right: 3),
      animationDuration: Duration(milliseconds: 300),
      animationType: BadgeAnimationType.slide,
      badgeContent: Text(
        _counter.toString(),
        style: TextStyle(color: Colors.white),
      ),
      child: IconButton(icon: Icon(Icons.shopping_cart), onPressed: () {}),
    );
  }

Widget _productImage() {
    return Padding(
      padding:  const EdgeInsets.all(10),
      child: Image.asset(
        "assets/images/products.jpg",
        fit: BoxFit.contain,
      ),
    );
}

  Widget _addRemoveCartButtons() {
    return  Row(
      mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
          RaisedButton.icon(
              onPressed: () {
                setState(() {
                  _counter++;
                });
              },
              icon: Icon(Icons.add),
              label: Text("")),
           RaisedButton(
             color:  Colors.grey ,
             onPressed: () {},
             child:Badge(
               badgeColor: Colors.grey,
               position: BadgePosition.topRight(top: 0, right: 3),
               animationDuration: Duration(milliseconds: 300),
               borderRadius: null,
               animationType: BadgeAnimationType.slide,
               badgeContent: Text(
                 _counter.toString(),
                 style: TextStyle(color: Colors.white),
               ),
             ),
           ) ,

          RaisedButton.icon(
              onPressed: () {
                if (_counter > 0) {
                  setState(() {
                    _counter--;
                  });
                }
              },
              icon: Icon(Icons.remove),
              label: Text('')),
        ],
    );
  }
}