Flutter全局功能更新状态小部件状态

Question

我正在编写一个Flutter应用程序，该应用程序使用Global Function处理Pushy.me通知。此功能需要更新有状态的小部件的状态。

我尝试使用全局密钥来访问小部件的当前状态，但是它什么也没做。我尝试了Eventify发射器，发射器和侦听器似乎没有对齐。

import 'package:eventify/eventify.dart';

EventEmitter emitter = new EventEmitter();
GlobalKey<_WrapperScreenState> _key = GlobalKey<_WrapperScreenState>();

void backgroundNotificationListener(Map<String, dynamic> data) {
  // Print notification payload data
  print('Received notification: $data');

  // Notification title
  String notificationTitle = 'MyApp';

  // Attempt to extract the "message" property from the payload: {"message":"Hello World!"}
  String notificationText = data['message'] ?? 'Hello World!';

  Pushy.notify(notificationTitle, notificationText, data);
  emitter.emit('updateList',null,"");
  try{
    print(_key.currentState.test);
  }
  catch(e){
    print(e);
  }
  // Clear iOS app badge number
  Pushy.clearBadge();
}
class WrapperScreen extends StatefulWidget {
  @override
  _WrapperScreenState createState() => _WrapperScreenState();
}