Flutter：本地通知插件，当用户点击通知时导航到特定屏幕

Question

我正在使用本地通知插件，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());}
  }

但是上下文总是空的并且给了我一个例外

NoSuchMethodError: The method 'ancestorStateOfType' was called on null

.

编辑

我尝试使用 navigatorKey 并按照@Günter Zöchbauer 的建议将其传递给 Material 应用程序，但它给了我另一个例外

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(),),
    );
  }

}

提醒页面

   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)));

它运行良好，但是当我在关闭应用程序后点击通知时，它会将我带到主页而不是所需的主页！ 我认为 navigatorKey 还没有初始化！

Answer 1

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 payload 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。在您的 MaterialApp 上设置 navigatorkey

@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,
   );
 }
}

Answer 2

将

navigatorKey

传递给

MaterialApp

并使用此键获取上下文。此上下文包含一个

Navigator

，您可以使用它切换到您想要的任何页面。

https://api.flutter.dev/flutter/material/MaterialApp/navigatorKey.html

Answer 3

随着您所做的最新更改，您被带到主页，更多的是与您在应用程序中进一步实例化和初始化插件的事实有关。考虑到应用程序被杀死，插件也会被杀死。您应该考虑在您的应用程序启动时更接近初始化插件，例如大约在创建应用程序或创建第一页时，具体取决于您想要的行为。在这个问题 https://github.com/MaikuB/flutter_local_notifications/issues/99 中，另一个开发人员已经能够更改应用程序被杀死时显示的第一页，但这可能与您想要发生的事情不同。