我正在为基于应用程序的通知实现“Firebase云消息传递（FCM）”，并在应用程序处于后台时尝试调用_firebaseMessagingBackgroundHandler中的sendLocalNotification函数时收到以下错误。
An error occurred in your background messaging handler: No Firebase App '[DEFAULT]' has been created - call Firebase.initializeApp()下面是示例代码，
void main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
FirebaseMessaging().onBackgroundMessage(_firebaseMessagingBackgroundHandler);
runApp(MyApp());
}
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
FirebaseMessaging firebaseMessaging = FirebaseMessaging.instance;
void sendLocalNotification(RemoteMessage message) {
}
}
Future<void> _firebaseMessagingBackgroundHandler(RemoteMessage message) async {
var myAppState = _MyAppState();
myAppState.sendLocalNotification(message);
}
1条答案
按热度按时间bis0qfac1#
根据您提供的代码，
_MyAppState类是在_firebaseMessagingBackgroundHandler方法内部创建的，因此，这意味着它没有使用/访问Firebase示例的上下文。只需使用
.createState()函数创建一个MyApp示例，然后就可以使用该状态调用sendLocalNotification()方法。