Hi is there any way to use the key and value that I've set in my Firebase Cloud Messaging console, Additional Options for push notification to DISPLAY inside my Flutter app?
I'm having a hard time making this work tbh, Example, I've used a url for key and a link for my value in my FCM console.
What I exactly want is like this: When I send a push notification, it display to a custom screen/url_launcher/widget within my app and that screen/url_launcher/widget shows the data I've inputted in FCM console using the KEY and VALUE that I've set when sending the push notification.
The problem is how do I display this data in my app? how do I use those key and value?
I'm kinda lost with how to code it tbh
below is my code:
import 'dart:async';
import 'dart:io';
import 'dart:math';
import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter/material.dart';
import 'package:webview_flutter/webview_flutter.dart';
import 'package:url_launcher/url_launcher.dart';
class HomePage extends StatefulWidget {
HomePage({Key key}) : super(key: key);
#override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
final FirebaseMessaging _firebaseMessaging = FirebaseMessaging();
#override
void initState() {
super.initState();
firebaseCloudMessagingListeners();
}
void firebaseCloudMessagingListeners() {
if (Platform.isIOS) iOSPermission();
_firebaseMessaging.getToken().then((token){
print(token);
});
_firebaseMessaging.configure(
onMessage: (Map<String, dynamic> message) async {
print('on message $message');
},
onResume: (Map<String, dynamic> message) async {
print('on resume $message');
},
onLaunch: (Map<String, dynamic> message) async {
print('on launch $message');
},
);
}
void iOSPermission() {
_firebaseMessaging.requestNotificationPermissions(
IosNotificationSettings(sound: true, badge: true, alert: true)
);
_firebaseMessaging.onIosSettingsRegistered
.listen((IosNotificationSettings settings)
{
print("Settings registered: $settings");
});
}
WebViewController _myController;
final Completer<WebViewController> _controller =
Completer<WebViewController>();
#override
Widget build(BuildContext context) {
return SafeArea(
child: Scaffold(
body: WebView(
initialUrl: 'https://syncshop.online/en/',
javascriptMode: JavascriptMode.unrestricted,
onWebViewCreated: (controller) {
_controller.complete(controller);
},
onPageFinished: (controller) async {
(await _controller.future).evaluateJavascript("document.getElementsByClassName('footer-container')[0].style.display='none';");
(await _controller.future).evaluateJavascript("document.getElementById('st_notification_1').style.display='none';");
(await _controller.future).evaluateJavascript("document.getElementById('sidebar_box').style.display='none';");
},
),
floatingActionButton: FutureBuilder<WebViewController>(
future: _controller.future,
builder: (BuildContext context, AsyncSnapshot<WebViewController> controller) {
if (controller.hasData) {
return FloatingActionButton(
onPressed: () {
controller.data.reload();
},
child: Icon(Icons.refresh),
);
}
return Container();
}
),
),
);
}
}
This is how you should send Custom data from the console,
You can receive the notification like this,
_firebaseMessaging.configure(
onMessage: (Map<String, dynamic> message) async {
print("$message");
Output
{notification: {title: rrakkk, body: wer}, data: {url: stackoverflow}}
How to fetch url value from above?
print("${message['data']['url']}");
Output
stackoverflow
Related
I just try using firebase push notification and messaging. I got an issue which is when I tried send message via console it showed completed but I do not get the notification. So can you guys explain my coding mistake. What must I do?
Local notification was fine.
local notification
Here the message that I tried send on console but i dont get any notification on the phone.
firebase console
this is my code
import 'package:flutter/material.dart';
import 'package:firebase_core/firebase_core.dart';
import 'firebase_options.dart';
import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';
const AndroidNotificationChannel channel = AndroidNotificationChannel(
'high_importance_channel', // id
'High Importance Notifications', // title
description: 'This channel is used for important notifications.', // description
importance: Importance.high,
playSound: true);
final FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
FlutterLocalNotificationsPlugin();
Future<void> _firebaseMessagingBackgroundHandler(RemoteMessage message) async {
await Firebase.initializeApp();
print('A bg message just showed up : ${message.messageId}');
}
Future<void> main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp(
options: DefaultFirebaseOptions.currentPlatform,
);
FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler);
await flutterLocalNotificationsPlugin
.resolvePlatformSpecificImplementation<AndroidFlutterLocalNotificationsPlugin>()
?.createNotificationChannel(channel);
await FirebaseMessaging.instance.setForegroundNotificationPresentationOptions(
alert: true,
badge: true,
sound: true,
);
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key key}) : super(key: key);
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
// This is the theme of your application.
//
// Try running your application with "flutter run". You'll see the
// application has a blue toolbar. Then, without quitting the app, try
// changing the primarySwatch below to Colors.green and then invoke
// "hot reload" (press "r" in the console where you ran "flutter run",
// or simply save your changes to "hot reload" in a Flutter IDE).
// Notice that the counter didn't reset back to zero; the application
// is not restarted.
primarySwatch: Colors.blue,
),
home: const MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({Key key, this.title}) : super(key: key);
// This widget is the home page of your application. It is stateful, meaning
// that it has a State object (defined below) that contains fields that affect
// how it looks.
// This class is the configuration for the state. It holds the values (in this
// case the title) provided by the parent (in this case the App widget) and
// used by the build method of the State. Fields in a Widget subclass are
// always marked "final".
final String title;
#override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
#override
void initState() {
super.initState();
FirebaseMessaging.onMessage.listen((RemoteMessage message) {
RemoteNotification notification = message.notification;
AndroidNotification android = message.notification?.android;
if (notification != null && android != null) {
flutterLocalNotificationsPlugin.show(
notification.hashCode,
notification.title,
notification.body,
NotificationDetails(
android: AndroidNotificationDetails(
channel.id,
channel.name,
channelDescription : channel.description,
color: Colors.blue,
playSound: true,
icon: '#mipmap/ic_launcher',
),
));
}
});
FirebaseMessaging.onMessageOpenedApp.listen((RemoteMessage message) {
print('A new onMessageOpenedApp event was published!');
RemoteNotification notification = message.notification;
AndroidNotification android = message.notification?.android;
if (notification != null && android != null) {
showDialog(
context: context,
builder: (_) {
return AlertDialog(
title: Text(notification.title),
content: SingleChildScrollView(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [Text(notification.body)],
),
),
);
});
}
});
}
void showNotification() {
setState(() {
_counter++;
});
flutterLocalNotificationsPlugin.show(
0,
"Testing $_counter",
"How you doin ?",
NotificationDetails(
android: AndroidNotificationDetails(channel.id, channel.name, channelDescription: channel.description,
importance: Importance.high,
color: Colors.blue,
playSound: true,
icon: '#mipmap/ic_launcher')));
}
#override
Widget build(BuildContext context) {
// This method is rerun every time setState is called, for instance as done
// by the _incrementCounter method above.
//
// The Flutter framework has been optimized to make rerunning build methods
// fast, so that you can just rebuild anything that needs updating rather
// than having to individually change instances of widgets.
return Scaffold(
appBar: AppBar(
// Here we take the value from the MyHomePage object that was created by
// the App.build method, and use it to set our appbar title.
title: Text(widget.title),
),
body: Center(
// Center is a layout widget. It takes a single child and positions it
// in the middle of the parent.
child: Column(
// Column is also a layout widget. It takes a list of children and
// arranges them vertically. By default, it sizes itself to fit its
// children horizontally, and tries to be as tall as its parent.
//
// Invoke "debug painting" (press "p" in the console, choose the
// "Toggle Debug Paint" action from the Flutter Inspector in Android
// Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
// to see the wireframe for each widget.
//
// Column has various properties to control how it sizes itself and
// how it positions its children. Here we use mainAxisAlignment to
// center the children vertically; the main axis here is the vertical
// axis because Columns are vertical (the cross axis would be
// horizontal).
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
const Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.headline4,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: showNotification,
tooltip: 'Increment',
child: const Icon(Icons.add),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
}
Is there any error on firebase connection to device?
SOLVED
Coding work fined.This occur because of I am using emulator instead of real device to tested.Thanks to u guys who answered my question.Those also help me a lot to understand.
Please refer the below code
class name FCM
import 'dart:async';
import 'package:firebase_core/firebase_core.dart';
import 'package:firebase_messaging/firebase_messaging.dart';
Future<void> onBackgroundMessage(RemoteMessage message) async {
await Firebase.initializeApp();
if (message.data.containsKey('data')) {
// Handle data message
final data = message.data['data'];
}
if (message.data.containsKey('notification')) {
// Handle notification message
final notification = message.data['notification'];
}
// Or do other work.
}
class FCM {
final _firebaseMessaging = FirebaseMessaging.instance;
final streamCtlr = StreamController<String>.broadcast();
final titleCtlr = StreamController<String>.broadcast();
final bodyCtlr = StreamController<String>.broadcast();
setNotifications() {
FirebaseMessaging.onBackgroundMessage(onBackgroundMessage);
FirebaseMessaging.onMessage.listen(
(message) async {
if (message.data.containsKey('data')) {
// Handle data message
streamCtlr.sink.add(message.data['data']);
}
if (message.data.containsKey('notification')) {
// Handle notification message
streamCtlr.sink.add(message.data['notification']);
}
// Or do other work.
titleCtlr.sink.add(message.notification!.title!);
bodyCtlr.sink.add(message.notification!.body!);
},
);
// With this token you can test it easily on your phone
final token =
_firebaseMessaging.getToken().then((value) => print('Token: $value'));
}
dispose() {
streamCtlr.close();
bodyCtlr.close();
titleCtlr.close();
}
}
And Main Class
void main() async {
await init();
runApp(const MyApp());
}
Future init() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
return const MaterialApp(
home: HomePage(),
);
}
}
class HomePage extends StatefulWidget {
const HomePage({Key? key}) : super(key: key);
#override
State<HomePage> createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
String notificationTitle = 'No Title';
String notificationBody = 'No Body';
String notificationData = 'No Data';
#override
void initState() {
final firebaseMessaging = FCM();
firebaseMessaging.setNotifications();
firebaseMessaging.streamCtlr.stream.listen(_changeData);
firebaseMessaging.bodyCtlr.stream.listen(_changeBody);
firebaseMessaging.titleCtlr.stream.listen(_changeTitle);
super.initState();
}
_changeData(String msg) => setState(() => notificationData = msg);
_changeBody(String msg) => setState(() => notificationBody = msg);
_changeTitle(String msg) => setState(() => notificationTitle = msg);
#override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text(
notificationTitle,
style: Theme.of(context).textTheme.headline4,
),
Text(
notificationBody,
style: Theme.of(context).textTheme.headline6,
),
Text(
notificationData,
style: Theme.of(context).textTheme.headline6,
),
],
),
),
);
}
}
Try by calling _firebasebackgroundhanler function as below in code
void main() async {
final FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin();
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler);
await FirebaseMessaging.instance.setForegroundNotificationPresentationOptions(
alert: true,
badge: true,
sound: true,
);
Firebasebackground handler function :
Future<void> _firebaseMessagingBackgroundHandler(RemoteMessage message) async {
await Firebase.initializeApp();
print("Handling a background message: ${message.messageId}");
}
Please I want to know how to launch WhatsApp in the Flutter webview app or launch WhatsApp from the browser in Flutter, have used many codes with no errors but they do not work.Am using mac m1
and vscode
import 'package:coinpaga/Connectivity_Provider.dart';
import 'package:coinpaga/services/local_notification_service.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'homepage.dart';
import 'package:hexcolor/hexcolor.dart';
import 'package:colorful_safe_area/colorful_safe_area.dart';
/// Receive message when app is in background solution for on
message
Future<void> backgroundHandler(RemoteMessage message)async{
print(message.data.toString());
print(message.notification!.title);
}
void main() async {
WidgetsFlutterBinding.ensureInitialized();
LocalNotificationServices.initialize();
await Firebase.initializeApp();
FirebaseMessaging.onBackgroundMessage(backgroundHandler);
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MultiProvider(
providers: [
ChangeNotifierProvider(
create: (context) => ConnectivityProvider(),
child: HomePage(),
)
],
child:MaterialApp(
title: 'coinpaga',
theme: ThemeData(
primarySwatch: Colors.blue,
),
debugShowCheckedModeBanner: false,
home: ColorfulSafeArea(
color: HexColor("#2e2a42"),
top: true,
bottom: false,
left: false,
right: false,
child: HomePage(),
)
),
);
}
}
Home.dart
import 'package:coinpaga/Connectivity_Provider.dart';
import 'package:coinpaga/no_internet.dart';
import 'package:flutter/material.dart';
import 'package:flutter_webview_plugin/flutter_webview_plugin.dart';
import 'package:provider/provider.dart';
class HomePage extends StatefulWidget {
// ignore: unused_field
final _flutterwebview = FlutterWebviewPlugin();
HomePage({ Key? key }) : super(key: key);
#override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
#override
void initState() {
super.initState();
Provider.of<ConnectivityProvider>(context, listen:
false).startMonitoring();
}
#override
Widget build(BuildContext context) {
return pageUI();
}
#override
void dispose() {
_flutterwebview.dispose();
super.dispose();
}
}
Widget pageUI() {
return Consumer<ConnectivityProvider>(
builder: (context, model, child) {
return model.isOnline
? WebviewScaffold(
url: 'https://coinpaga.com',
withLocalStorage: true,
withJavascript: true,
scrollBar: false,
initialChild: Center(child: Text('Loading...')),
) : NoInternet();
},
);
}
// ignore: camel_case_types
class _flutterwebview {
static void dispose() {}
}
Please help me go through it.
String text = "Hello World !! Hey There";
String url = "https://wa.me/?text=${Uri.encodeFull(text)}";
if (await canLaunchUrl(Uri.parse(url))) {
await launchUrl(Uri.parse(url),
mode: LaunchMode.externalApplication);
}
First, add url_launcher, then I use this code to launch whatsapp on flutter webview and works.
WebView(
initialUrl: getUrl(_url),
javascriptMode: JavascriptMode.unrestricted,
navigationDelegate: (NavigationRequest request) async {
if (request.url
.startsWith('https://api.whatsapp.com/send?phone')) {
print('blocking navigation to $request}');
List<String> urlSplitted = request.url.split("&text=");
String phone = "0123456789";
String message =
urlSplitted.last.toString().replaceAll("%20", " ");
await _launchURL(
"https://wa.me/$phone/?text=${Uri.parse(message)}");
return NavigationDecision.prevent;
}
print('allowing navigation to $request');
return NavigationDecision.navigate;
},
)
_launchURL(String url) async {
if (await canLaunch(url)) {
await launch(url);
} else {
throw 'Could not launch $url';
}
}
You can use url_launcher to launch URLs.
You can give https://api.whatsapp.com/send/?phone=(phone_number) URL to launch.
For the launching the WhatsApp Website use launch('https://api.whatsapp.com/send/?phone=(phone_number)')
Make sure you give your country code without (+).
i try do example flutter app get notification from firebase. I have done everything suggested in the various guides. but I'm in trouble, in ios the code works perfectly, while on android it doesn't and I can't explain why. It seems that when _firebaseMessaging.getToken () is executed it leads nowhere and waits for a response that never comes. some of you have some tips? I tried all the functions made available by _firebaseMessaging but without success.
import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter/material.dart';
import 'dart:io' show Platform;
import 'package:flutter/foundation.dart';
class PushMessagingExample extends StatefulWidget {
#override
_PushMessagingExampleState createState() => _PushMessagingExampleState();
}
class _PushMessagingExampleState extends State<PushMessagingExample> {
String _homeScreenText = "Waiting for token...";
String _messageText = "Waiting for message...";
final FirebaseMessaging _firebaseMessaging = FirebaseMessaging();
#override
void initState() {
debugPrint('test firebase');
super.initState();
_firebaseMessaging.configure(
onMessage: (Map<String, dynamic> message) async {
setState(() {
_messageText = "Push Messaging message: $message";
});
print("onMessage: $message");
},
onLaunch: (Map<String, dynamic> message) async {
setState(() {
_messageText = "Push Messaging message: $message";
});
print("onLaunch: $message");
},
onResume: (Map<String, dynamic> message) async {
setState(() {
_messageText = "Push Messaging message: $message";
});
print("onResume: $message");
},
);
_firebaseMessaging.requestNotificationPermissions(
const IosNotificationSettings(sound: true, badge: true, alert: true));
_firebaseMessaging.onIosSettingsRegistered
.listen((IosNotificationSettings settings) {
print("Settings registered: $settings");
});
_firebaseMessaging.subscribeToTopic('all');
debugPrint('token call');
_firebaseMessaging.getToken().then((String token) {
debugPrint('test firebase token: $token');
print(token);
assert(token != null);
setState(() {
_homeScreenText = "Push Messaging token: $token";
});
print(_homeScreenText);
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Push Messaging Demo'),
),
body: Material(
child: Column(
children: <Widget>[
Center(
child: Text(_homeScreenText),
),
Row(children: <Widget>[
Expanded(
child: Text(_messageText),
),
])
],
),
));
}
}
void main() {
runApp(
MaterialApp(
home: PushMessagingExample(),
),
);
}
I think your problem is an asynchronous method, first, divide them into Future methods and into methods to create different FirebaseMessaging instances.
I'm using FCM to send push notifications to my device right now and it's working perfectly. However when the app is open, I only get the onResume to be executed when I'm in that particular page. I want to display the notification on the top regardless of which page(or class) the user is on. Basically I want the notifications to be displayed globally (Show popup). Any help would be appreciated. Here is the code from the page that displays the notifications.
if (Platform.isIOS) {
iosSubscription = _fcm.onIosSettingsRegistered.listen((data) {
_saveDeviceToken();
});
_fcm.requestNotificationPermissions(IosNotificationSettings());
} else {
_saveDeviceToken();
}
_fcm.configure(
onMessage: (Map<String, dynamic> message) async {
print("onMessage: $message");
var temp = message['notification'];
setState(() {
title.add(temp['title']);
body.add(temp['body']);
});
showDialog(
context: context,
builder: (context) => AlertDialog(
content: ListTile(
title: Text(message['notification']['title']),
subtitle: Text(message['notification']['body']),
),
actions: <Widget>[
FlatButton(
color: const Color(0xFF650572),
child: Text('Ok'),
onPressed: () => Navigator.of(context).pop(),
),
],
),
);
},
onLaunch: (Map<String, dynamic> message) async {
print("onLaunch: $message");
Navigator.push(
context, MaterialPageRoute(builder: (context) => MessageHandler()));
// TODO optional
},
onResume: (Map<String, dynamic> message) async {
print("onResume: $message");
Navigator.push(context,
MaterialPageRoute(builder: (context) => MessageHandler()));
// TODO optional
},
);
}
Wrap your MaterialApp in a wrapper class ... lets call that FCMWrapper.
class FCMWrapper extends StatefulWidget {
final Widget child;
const FCMWrapper({Key key, this.child}) : super(key: key);
#override
_FCMWrapperState createState() => _FCMWrapperState();
}
class _FCMWrapperState extends State<FCMWrapper> {
#override
Widget build(BuildContext context) {
return Consumer<YourObservable>(
builder: (context, yourObservable, _) {
if (yourObservable != null && yourObservable.isNotEmpty) {
Future(
() => navigatorKey.currentState.push(
PushNotificationRoute(
child: YourViewOnNotification(),
)),
),
);
}
return widget.child;
},
);
}
}
I have stored my data in an observable from a separate class. So when I receive a notification I update my observable. Since we are consuming on that observable the PushNotificationRoute would be called.
PushNotificationRoute is simply a class which extends ModalRoute.
class PushNotificationRoute extends ModalRoute {
final Widget child;
PushNotificationRoute({this.child});
... //Override other methods to your requirement
//This is important
#override
Widget buildPage(BuildContext context, Animation<double> animation,
Animation<double> secondaryAnimation) {
return SafeArea(
child: Builder(builder: (BuildContext context) {
return child;
}),
);
}
...
#override
Duration get transitionDuration => Duration(milliseconds: 200);
}
Now in main.dart declare a global key like
var navigatorKey = GlobalKey<NavigatorState>();
and wrap your MaterialApp like
...
FCMWrapper(
child: MaterialApp(
navigatorKey: navigatorKey,
title: 'Your App',
...
So now every time a notification comes in your observable should update and push a modal route which would be shown over anywhere in the app.
I am making a simple application which uses a WebView widget as it's main widget. I want to be able to send a notification to all users from the firebase console. The application has no authentication.
My MessageHandler (defined in main.dart)
class MessageHandler extends StatefulWidget {
#override
_MessageHandlerState createState() => _MessageHandlerState();
}
class _MessageHandlerState extends State<MessageHandler>{
final FirebaseMessaging _fcm = FirebaseMessaging();
#override
void initState(){
super.initState();
_fcm.configure(
onMessage: (Map<String, dynamic> message) async {
print("here");
print("onMessage: $message");
final snackbar = SnackBar(
content: Text(message['notification']['title']),
);
},
);
Main
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
title: "Simple App",
home: WebViewer()
);
}
}
The WebViewer Widget works so I have not added it to the question.
On the Firebase Console, the message appears to have been sent
but the alert does not appear on the Android Emulator, nor does the snackbar.
WebView
class WebViewer extends StatelessWidget {
final Completer<WebViewController> _controller = Completer<WebViewController>();
//FirebaseMessaging _firebaseMessaging = new FirebaseMessaging();
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Center(child: Text("Event Viewer")),
),
body: WebView(
initialUrl: "https://google.com",
javascriptMode: JavascriptMode.unrestricted,
onWebViewCreated: (WebViewController webViewController){
_controller.complete(webViewController);
},
)
);
In order to show the snackbar, you have to reference the specific scaffold instance that your app has built and tell it to show a snackbar. If the context is handy, you can say Scaffold.of(context).showSnackbar( snackbar ); Since you don't have access to the context, another way to reference the Scaffold is to define a key for the scaffold and then make sure you assign that key to the webviewer's scaffold.
You can say
class MessageHandler extends StatefulWidget {
// pass a reference to the scaffold key to the message handler when it is created
final GlobalKey<ScaffoldState> scaffoldKey;
MessageHandler({this.scaffoldKey});
#override
_MessageHandlerState createState() => _MessageHandlerState();
}
class _MessageHandlerState extends State<MessageHandler>{
final FirebaseMessaging _fcm = FirebaseMessaging();
#override
void initState(){
super.initState();
_fcm.configure(
onMessage: (Map<String, dynamic> message) async {
print("here");
print("onMessage: $message");
final snackbar = SnackBar(
content: Text(message['notification']['title']),
);
// reference the scaffold with its key and call showSnackBar
widget.scaffoldKey.currentState.showSnackbar(snackbar);
},
);
Then define the scaffold's key somewhere it can be passed to the message handler and the scaffold:
final GlobalKey<ScaffoldState> scaffoldKey = new GlobalKey<ScaffoldState>();
....
Scaffold(
key: scaffoldKey,
...
More info:
Display SnackBar in Flutter