【发布时间】：2020-05-29 05:30:26
【问题描述】：
我尝试为我的 Flutter 应用获取 Firebase 云消息传递令牌。在android模拟器上运行这里出了什么问题？我试过 flutter run 但这不起作用，我在这里使用 1.firebase_messaging: ^6.0.9 作为依赖项 和 2.
import 'package:flutter/material.dart';
import 'package:firebase_messaging/firebase_messaging.dart';
class Notifications_ extends StatefulWidget {
@override
_Notifications_State createState() => _Notifications_State();
}
class _Notifications_State extends State<Notifications_> {
final FirebaseMessaging _messaging=FirebaseMessaging();
@override
void initState() {
super.initState();
_messaging.getToken().then((token)
{
print(token);
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('notification'),
),
body: Text('body testing'),
);
}
}
E/flutter ( 5931): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: MissingPluginException(No implementation found for method getToken on channel plugins.flutter.io/firebase_messaging)E/flutter (5931): #0 MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:319:7) E/颤动（5931）： E/flutter (5931):#1 FirebaseMessaging.getToken (package:firebase_messaging/firebase_messaging.dart:150:27) E/颤振（5931）：#2 _Notifications_State.initState（包：sampletestingpro/Notification.dart:17:16） E/flutter（5931）：#3 StatefulElement._firstBuild（包：flutter/src/widgets/framework.dart:4355:58） E/flutter (5931):#4 ComponentElement.mount (package:flutter/src/widgets/framework.dart:4201:5) E/flutter（5931）：#5 Element.inflateWidget（包：flutter/src/widgets/framework.dart:3194:14） E/flutter（5931）：#6 Element.updateChild（包：flutter/src/widgets/framework.dart:2988:12） E/flutter (5931):#7 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4243:16) E/flutter (5931):#8 Element.rebuild (package:flutter/src/widgets/framework.dart:3947:5) E/flutter (5931):#9 StatelessElement.update (package:flutter/src/widgets/framework.dart:4298:5) E/flutter (5931): #10 Element.updateChild (package:flutter/src/widgets/framework.dart:2977:15) E/flutter (5931): #11 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4243:16) E/flutter (5931): #12 Element.rebuild (package:flutter/src/widgets/framework.dart:3947:5) E/flutter (5931): #13 StatelessElement.update (package:flutter/src/widgets/framework.dart:4298:5) E/flutter (5931): #14 Element.updateChild (package:flutter/src/widgets/framework.dart:2977:15) E/flutter (5931):#15 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4243:16) E/flutter (5931): #16 Element.rebuild (package:flutter/src/widgets/framework.dart:3947:5) E/flutter (5931): #17 ProxyElement.update (package:flutter/src/widgets/framework.dart:4557:5) E/flutter（5931）：#18 Element.updateChild（包：flutter/src/widgets/framework.dart:2977:15） E/flutter（5931）：#19 ComponentElement.performRebuild（包：flutter/src/widgets/framework.dart:4243:16） E/flutter (5931): #20 Element.rebuild (package:flutter/src/widgets/framework.dart:3947:5) E/flutter (5931): #21 ProxyElement.update (package:flutter/src/widgets/framework.dart:4557:5) E/flutter (5931): #22 Element.updateChild (package:flutter/src/widgets/framework.dart:2977:15) E/flutter (5931): #23 RenderObjectElement.updateChildren (package:flutter/src/widgets/framework.dart:5161:32) E/flutter (5931):#24 MultiChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5561:17) E/flutter (5931): #25 Element.updateChild (package:flutter/src/widgets/framework.dart:2977:15) E/flutter（5931）：#26 ComponentElement.performRebuild（包：flutter/src/widgets/framework.dart:4243:16） E/flutter (5931): #27 Element.rebuild (package:flutter/src/widgets/framework.dart:3947:5) E/flutter (5931): #28 StatefulElement.update (package:flutter/src/widgets/framework.dart:4413:5) E/flutter (5931): #29 Element.updateChild (package:flutter/src/widgets/framework.dart:2977:15) E/flutter (5931):#30 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4243:16) E/flutter（5931）：#31 Element.rebuild（包：flutter/src/widgets/framework.dart:3947:5） E/flutter (5931):#32 ProxyElement.update (package:flutter/src/widgets/framework.dart:4557:5) E/flutter（5931）：#33 Element.updateChild（包：flutter/src/widgets/framework.dart:2977:15） E/flutter (5931):#34 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4243:16) E/flutter（5931）：#35 Element.rebuild（包：flutter/src/widgets/framework.dart:3947:5） E/flutter (5931):#36 StatefulElement.update (package:flutter/src/widgets/framework.dart:4413:5) E/flutter（5931）：#37 Element.updateChild（包：flutter/src/widgets/framework.dart:2977:15） E/flutter（5931）：#38 SingleChildRenderObjectElement.update（包：flutter/src/widgets/framework.dart:5452:14） E/flutter（5931）：#39 Element.updateChild（包：flutter/src/widgets/framework.dart:2977:15） E/flutter（5931）：#40 ComponentElement.performRebuild（包：flutter/src/widgets/framework.dart:4243:16） E/flutter (5931): #41 Element.rebuild (package:flutter/src/widgets/framework.dart:3947:5) E/flutter (5931): #42 StatelessElement.update (package:flutter/src/widgets/framework.dart:4298:5) E/flutter（5931）：#43 Element.updateChild（包：flutter/src/widgets/framework.dart:2977:15） E/flutter（5931）：#44 SingleChildRenderObjectElement.update（包：flutter/src/widgets/framework.dart:5452:14） E/颤振（5931）：#45 Element.update.
【问题讨论】：
-
插件不会通过热重载加载。您需要重新构建项目以使其正常工作。
标签： firebase flutter dart push-notification