单击通知行为仅在应用程序在后台运行时才有效?
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【中文标题】单击通知行为仅在应用程序在后台运行时才有效?【英文标题】:Clicking notification behavior only works when the app is in the background in flutter? 【发布时间】:2021-11-02 21:48:21 【问题描述】:我正在尝试使用 firebase 云功能向所有订阅自定义主题的用户推送通知,但在后台通知场景中,当单击通知时,它仅在应用程序处于后台时导航到所需的屏幕,但在终止应用程序和有一个通知它打开主屏幕不是通知主题
import 'package:flutter/material.dart';
import 'package:firebase_core/firebase_core.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
'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');
void subscribeToTopic() async
try
await FirebaseMessaging.instance.subscribeToTopic('notifications');
print('subscribed to topic');
catch (e)
print('error is $e');
Future<void> main() async
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler);
await flutterLocalNotificationsPlugin
.resolvePlatformSpecificImplementation<
AndroidFlutterLocalNotificationsPlugin>()
?.createNotificationChannel(channel);
await FirebaseMessaging.instance.setForegroundNotificationPresentationOptions(
alert: true,
badge: true,
sound: true,
);
runApp(MyApp());
class MyApp extends StatelessWidget
@override
Widget build(BuildContext context)
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
class MyHomePage extends StatefulWidget
MyHomePage(Key? key, this.title) : super(key: key);
final String? title;
@override
_MyHomePageState createState() => _MyHomePageState();
class _MyHomePageState extends State<MyHomePage>
int _counter = 0;
@override
void initState()
super.initState();
subscribeToTopic();
FirebaseMessaging.onMessage.listen((RemoteMessage message)
print('onMessage data is $message.data');
print('onMessage notification is $message.notification');
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,
channel.description,
color: Colors.blue,
playSound: true,
icon: '@mipmap/ic_launcher',
),
));
);
FirebaseMessaging.onMessageOpenedApp.listen((RemoteMessage message)
print('A new onMessageOpenedApp event was published!');
Navigator.pushNamed(context, '/productsScreen');
);
void showNotification() async
setState(()
_counter++;
);
flutterLocalNotificationsPlugin.show(
0,
"Testing $_counter",
"How you doin ?",
NotificationDetails(
android: AndroidNotificationDetails(
channel.id, channel.name, channel.description,
importance: Importance.high,
color: Colors.blue,
playSound: true,
icon: '@mipmap/ic_launcher')));
@override
Widget build(BuildContext context)
return Scaffold(
appBar: AppBar(
title: Text(widget.title!),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.headline4,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: showNotification,
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
【问题讨论】:
【参考方案1】:在您的应用从终止(已终止)状态打开后,您可以使用FirebaseMessaging.getInitialMessage()
。见documentation
FirebaseMessaging.onMessageOpenedApp
仅在应用程序处于后台状态但仍在运行时有效。所以在一天结束时,你的 main 看起来就像这样:
RemoteMessage? initialMessage;
Future<void> main() async
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
// We add this additional line to get the initial message
initialMessage = FirebaseMessaging.instance.getInitialMessage();
FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler);
await flutterLocalNotificationsPlugin
.resolvePlatformSpecificImplementation<
AndroidFlutterLocalNotificationsPlugin>()
?.createNotificationChannel(channel);
await FirebaseMessaging.instance.setForegroundNotificationPresentationOptions(
alert: true,
badge: true,
sound: true,
);
runApp(MyApp());
如果initialMessage
不为空,您将知道用户点击了通知并且应用程序随即打开。在此之后,您可以根据需要处理 initialMessage 中的数据,最好在调用 runApp()
之后处理,因为您希望在用户打开应用程序后导航到不同的屏幕。
【讨论】:
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