无法使用FCM onBackgroundMessage导航到特定屏幕

import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  final FirebaseMessaging _firebaseMessaging = FirebaseMessaging();

  @override
  Widget build(BuildContext context) {
    _firebaseMessaging.configure(
      onBackgroundMessage: myBackgroundMessageHandler,
    );

    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('FCM Navigation Example'),
        ),
        body: Center(
          child: Text('Home Screen'),
        ),
      ),
    );
  }

  Future<dynamic> myBackgroundMessageHandler(Map<String, dynamic> message) {
    if (message.containsKey('screen')) {
      String screen = message['screen'];
      // 根据接收到的屏幕名称进行导航
      if (screen == 'screen1') {
        Navigator.push(
          context,
          MaterialPageRoute(builder: (context) => Screen1()),
        );
      } else if (screen == 'screen2') {
        Navigator.push(
          context,
          MaterialPageRoute(builder: (context) => Screen2()),
        );
      }
    }

    return Future.value();
  }
}

class Screen1 extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Screen 1'),
      ),
      body: Center(
        child: Text('Screen 1'),
      ),
    );
  }
}

class Screen2 extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Screen 2'),
      ),
      body: Center(
        child: Text('Screen 2'),
      ),
    );
  }
}