无法使用FCM onMessage导航到不同的屏幕。

Question

当用户点击应用程序在前台时从到达函数触发的通知时，我试图使用onMessage导航到另一个屏幕。到目前为止，我还未能做到这一点。

以下是我迄今所做的工作：

  void initState(){ 
    super.initState();
    var initializationSettingsAndroid  = AndroidInitializationSettings('@drawable/splash');
    var initializationSettings = InitializationSettings(android:initializationSettingsAndroid);
    flutterLocalNotificationsPlugin.initialize(initializationSettings);
    
    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,
                channel.description,
                icon: '@drawable/splash',
                playSound: true
              ),
            ));
            Get.to(OrdersScreen());
      }
    });
  }

我收到通知，但当我点击时，什么都不会发生。我还在日志中得到以下异常。

E/颤振(17567)：错误:flutter/lib/ui/ui_dart_state.cc(199)未处理的异常:您尝试使用没有E/flutter (17567)的无内容导航:一个GetMaterialApp或Get.key。E/flutter (17567)：如果您正在测试您的应用程序，您可以使用:e/ MaterialApp (17567)：MaterialApp= true，或者如果您正在E/flutter (17567)上运行您的应用程序:一个物理设备或模拟器，您必须将您的MaterialApp E/flutter (17567)：交换为GetMaterialApp。E/颤振(17567)：E/颤振(17567)：#0 GetNavigation.global包:get/…/src/ExtensionNavigation.DART:1052E/flutter (17567)：#1 GetNavigation.to包:get/…/src/extension_navigation.dart:511 E/颤振(17567)：#2 _MyAppState.initState。包装:颤振_完整_指南/主要。飞镖:146E/颤振(17567)：#3 _rootRunUnary (省道:1362:47)E/颤振(17567)：#4 _CustomZone.runUnary (飞镖:异步/zone.dart:1265:19)E/ _CustomZone.runUnaryGuarded (17567)：#5 _CustomZone.runUnaryGuarded(飞镖:异步/左转:1170:7)E/颤振(17567)：#6 _BufferingStreamSubscription._sendData (飞镖:异步/流__CustomZone.runUnaryGuarded:341:11) _DelayedData.perform (省:异步/流_隐式:591:14)E/颤振(17567)：#8 _StreamImplEvents.handleNext (省:异步/流_隐式:706:11)E/颤振(17567)：#9 _PendingEvents.schedule。(省:异步/流_隐式:663:7)E/颤振(17567)：#10 _rootRun (飞镖:异步/zone.dart:1346:47)E/ _CustomZone.run (17567)：#11 _CustomZone.run(飞镖:异步/zone.dart:1258:19)E/_CustomZone.run (17567)：#12 _CustomZone.runGuarded (飞镖:异步/飞镖:1162:7)E/颤振(17567)：#13 _CustomZone.bindCallbackGuarded。(省道:异步/左转:1202:23)E/颤振(17567)：#14 _rootRun (飞镖:异步/zone.dart:1354:13) _CustomZone.run (飞镖:异步/zone.dart:1258:19)E/ _CustomZone.runGuarded (17567)：#16 _CustomZone.runGuarded(飞镖:异步/zone.dart:1162:7)E/颤振(17567)：#17 _CustomZone.bindCallbackGuarded。(飞镖:异步/左转:1202:23)E/颤振(17567)：#18 _microtaskLoop (省道:异步/调度_微任务.dart:40:21)E/ _startMicrotaskLoop (17567)：#19 _startMicrotaskLoop(省道:异步/调度_微任务.dart:49:5)E/颤振(17567)：D/ViewRootImpl@874c66fMainActivity: stopped(false) old=false

Answer 1

我可以用导航键来完成这个任务。

创建了全局密钥：

final GlobalKey<NavigatorState> navigatorKey = GlobalKey(debugLabel: "Main Navigator");

在MaterialApp中初始化它：

MaterialApp( 
        navigatorKey: navigatorKey,   

它在onMessage函数中使用：

navigatorKey.currentState.push(
    MaterialPageRoute(builder: (_) => OrdersScreen()));

Answer 2

若要打开通知，必须使用以下命令

 FirebaseMessaging.onMessageOpenedApp.listen((RemoteMessage message) {
        // print('A new onMessageOpenedApp event was published!');

         Get.to(OrdersScreen());
      });