Push notifications com Firebase Cloud Messaging

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buildscript {
  repositories {
    // Verifique se o seu arquivo tem esta linha, caso não tenha, adicione-a:
    google()
  }
  dependencies {
    ...
    // Adicione esta linha para a leitura do arquivo .json do Firebase
    classpath 'com.google.gms:google-services:4.3.5'
  }
}
allprojects {
  ...
  repositories {
    // Verifique se o seu arquivo tem esta linha, caso não tenha, adicione-a:
    google() 
    ...
  }
}

apply plugin: 'com.android.application'
// Adicione esta linha
apply plugin: 'com.google.gms.google-services'
dependencies {
  // Dependências necessárias, adicione-as!
implementation platform('com.google.firebase:firebase-bom:26.2.0')
implementation 'com.google.firebase:firebase-messaging'
implementation 'com.google.firebase:firebase-analytics'
 }

name: alura_notification
description: A new Flutter project.
publish_to: 'none' # Remove this line if you wish to publish to pub.dev
version: 1.0.0+1
environment:
  sdk: ">=2.7.0 <3.0.0"
dependencies:
  flutter:
    sdk: flutter
  cupertino_icons: ^1.0.1
dev_dependencies:
  flutter_test:
    sdk: flutter
  integration_test:
    sdk: flutter
flutter:
  uses-material-design: true

    _firebaseMessaging.configure(
      onMessage: (Map<String, dynamic> message) async {
        print("onMessage: $message");
      },
      onLaunch: (Map<String, dynamic> message) async {
        print("onLaunch: $message");
      },
      onResume: (Map<String, dynamic> message) async {
        print("onResume: $message");
      },
    );
    _firebaseMessaging.getToken().then((String token) {
      assert(token != null);
      print('Push token gerado: $token');
    });

import 'package:flutter/material.dart';
import 'package:firebase_messaging/firebase_messaging.dart';
void main() {
  runApp(MyApp());
}
    {
  
  @override
  Widget (BuildContext context) {
     (
      : ,
      : (
        : Colors.blue,
      ),
      : (: ),
    );
  }
}
{
  ({Key key, this.title}) : (: key);
   String title;
  @override
  _MyHomePageState () => ();
}
{
   FirebaseMessaging _firebaseMessaging = ();
  @override
   () {
    super.();
    _firebaseMessaging.(
      : (Map<String, dynamic> message) async {
        ();
      },
      onLaunch: (Map<String, dynamic> message) async {
        ();
      },
      onResume: (Map<String, dynamic> message) async {
        ();
      },
    );
    _firebaseMessaging.().((String token) {
      (token != );
      ();
    });
  }
   _counter = ;
   () {
    (() {
      _counter++;
    });
  }
  @override
  Widget (BuildContext context) {
     (
      : (
        : (widget.title),
      ),
      : (
        : (
          : MainAxisAlignment.center,
          : <Widget>[
            (
              ,
            ),
            (
              ,
              : Theme.(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      : (
        : _incrementCounter,
        : ,
        : (Icons.add),
      ),
    );
  }
}

    _firebaseMessaging.configure(
      onMessage: (Map<String, dynamic> message) async {
        print("onMessage: $message");
      },
      onLaunch: (Map<String, dynamic> message) async {
        print("onLaunch: $message");
      },
      onResume: (Map<String, dynamic> message) async {
        print("onResume: $message");
      },
    );