Question

我正在使用本地通知插件，并且一切正常，除了当我点击通知时。我想在用户点击通知时导航到特定屏幕

Future onSelectNotification(String payload) async {
    //convert payload json to notification model object
    try{
    Map notificationModelMap = jsonDecode(payload);
    NotificationModel model = NotificationModel.fromJson(notificationModelMap);

    await Navigator.push(
        context,// it`s null!
        new MaterialPageRoute(
            builder: (context) => CommitmentPage(model)));}
            catch(e){print(e.toString());}
  }

，但上下文始终为空，并给了我一个例外 NoSuchMethodError: The method 'ancestorStateOfType' was called on null。

修改

我尝试使用navigatorKey并将其传递给@GünterZöchbauer建议的材料应用程序，但这给了我另一个例外

Navigator operation requested with a context that does not include a Navigator.
The context used to push or pop routes from the Navigator must be that of a widget that is a descendant of a Navigator widget

main.dart

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {

static final navigatorKey = new GlobalKey<NavigatorState>();

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      navigatorKey:navigatorKey ,
      title: 'notification',
      theme: ThemeData(
        primarySwatch: Colors.purple,
      ),
      home: new RootPage(auth: new Auth(),),
    );
  }

}

ReminderPage

   class ReminderPage extends StatefulWidget {

    @override
      _ReminderPageState createState() => _ReminderPageState();

    }

class _ReminderPageState extends State<ReminderPage> {
  final flutterLocalNotificationsPlugin = new FlutterLocalNotificationsPlugin();
....

 @override
  void initState() {
    super.initState();

    _initLocalNotification();
....

  }


// this method is called when u tap on the notification
 Future onSelectNotification(String payload) async {

    //convert payload json to notification model object
    Map notificationModelMap = jsonDecode(payload);
    NotificationModel model = NotificationModel.fromJson(notificationModelMap);

    try{
   await Navigator.push(
        MyApp.navigatorKey.currentState.context,
        new MaterialPageRoute(
            builder: (context) => CommitmentPage(model)));}
            catch(e){print(e.toString());}


  }

}

编辑2 而不是使用

 await Navigator.push(
            MyApp.navigatorKey.currentState.context,
            new MaterialPageRoute(
                builder: (context) => CommitmentPage(model)));}
                catch(e){print(e.toString());}

我用过

await  MyApp.navigatorKey.currentState.push(MaterialPageRoute(builder: (context) => CommitmentPage(model)));

，它工作正常，但是当我在终止应用程序后点击通知时，它把我带到首页，而不是所需的页面！我认为navigatorKey尚未初始化！

Answer 1

将navigatorKey传递到MaterialApp并使用此键获取上下文。此上下文包含一个Navigator，您可以使用它来切换到所需的任何页面。

https://docs.flutter.io/flutter/material/MaterialApp/navigatorKey.html

Answer 2

使用最新的更改将您带到主页，这与在应用程序中进一步实例化并初始化插件的页面有关。考虑到该应用程序被杀死，该插件也将被杀死。您应该考虑在应用启动时更接近地初始化插件，例如创建应用程序的时间或创建首页的时间，具体取决于您想要的行为。在本期https://github.com/MaikuB/flutter_local_notifications/issues/99中，另一位开发人员已经能够在应用被终止时更改显示的第一页，但这可能与您想要发生的事情不同。

Answer 3

1. FMC 有效载荷

{
  "notification": {
    "body": "Hey, someone book your product", 
    "title": "production booking"
  }, 
  "priority" : "high",
  "data": {
    "action" : "BOOKING" //to identify the action
  },
  "to": "deviceFCMId"
}

2.在 localnotification.show 方法中设置有效载荷数据

showNotification(RemoteMessage message) {
  RemoteNotification notification = message.notification;
  AndroidNotification android = message.notification?.android;
  String action = message.data['action']; // get the value set in action key from FCM Json in Step1
  // local notification to show to users using the created channel.
  if (notification != null && android != null) {
    flutterLocalNotificationsPlugin.show(
        notification.hashCode,
        notification.title,
        notification.body,
        NotificationDetails(
            android: androidNotificationDetails, iOS: iOSNotificationDetails),
        payload: action // set the value of payload
    );
  }
}

3.在 MyApp 类中创建一个 navigatorKey

class _MyAppState extends State<MyApp> {
  final GlobalKey<NavigatorState> navigatorKey =
      GlobalKey(debugLabel: "Main Navigator"); //
}

4.在 MaterialApp 上设置导航键

@override
  Widget build(BuildContext context) {
    //this change the status bar color to white
    return MaterialApp(
          navigatorKey: navigatorKey,
    ....

5.在 initState 上，初始化 localnotificationPlugin 并声明 onSelectNotification 方法

@override
  void initState() {
    super.initState();
    flutterLocalNotificationsPlugin.initialize(initializationSettings,
        onSelectNotification: onSelectNotification);
  }

  Future<dynamic> onSelectNotification(payload) async {
  // implement the navigation logic
  }

6.导航逻辑示例

Future<dynamic> onSelectNotification(payload) async {
// navigate to booking screen if the payload equal BOOKING
if(payload == "BOOKING"){
 this.navigatorKey.currentState.pushAndRemoveUntil(
  MaterialPageRoute(builder: (context) => BookingScreen()),
   (Route<dynamic> route) => false,
   );
 }
}

Flutter：本地通知插件，当用户点击通知时导航至特定屏幕

3 个答案: