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json - '_InternalLinkedHashMap<String, dynamic >' is not a subtype of type ' Iterable<dynamic>' in type cast

我正在尝试同时使用built_value和json_serializable来解析从服务器到模型类的json响应。以下是依赖项:built_collection:^4.0.0built_value:^6.1.4dev_dependencies:build_runner:^1.0.0built_value_generator:^6.1.4json_serializable:^1.4.0下面是我写的代码abstractclassUserDataimplementsBuilt{Stringgetuser_first_name;Stringgetuser_last_name;Stringget

json - '_InternalLinkedHashMap<String, dynamic >' is not a subtype of type ' Iterable<dynamic>' in type cast

我正在尝试同时使用built_value和json_serializable来解析从服务器到模型类的json响应。以下是依赖项:built_collection:^4.0.0built_value:^6.1.4dev_dependencies:build_runner:^1.0.0built_value_generator:^6.1.4json_serializable:^1.4.0下面是我写的代码abstractclassUserDataimplementsBuilt{Stringgetuser_first_name;Stringgetuser_last_name;Stringget

dart - 获取 _InternalLinkedHashMap<String, dynamic >' is not a subtype of type ' FutureOr<Response>'

我是Dart/Flutter的新手,我正在尝试获取使用网络服务的future结果:Future_readData()async{(...)http.Responseresponse=awaithttp.post(request,headers:{"SOAPAction":"http://www.totvs.com/IwsConsultaSQL/RealizarConsultaSQL","Content-Type":"text/xml;charset=UTF-8","Authorization":"BasicbWVzdHJlOnRvdHZz","cache-control":"no-ca

flutter - 如何将 InternalLinkedHashMap 转换为 Map<dynamic, dynamic>?

我正在设置firebase云消息传递并在我的onResume()中回调我有以下内容:FutureonResume(Mapmessage)async{finalMapdata=message['data'];finalStringurl=data['url'];if(url!=null){_webViewController?.loadUrl(url);}}当函数到达finalMapdata=message['data'];它会在没有警告的情况下过早地、无声地返回。如果我改为运行finaldynamicdata=message['data'];它按预期继续。检查message类型狂欢me

asynchronous - 未处理的异常 : type '_InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'Future<dynamic>'

我收到错误消息:UnhandledException:type'_InternalLinkedHashMap'isnotasubtypeoftype'Future`_LocationScreenState.build.(package:clima/screens/location_screen.dart:71:32)被精确定位的线在里面:FlatButton(onPressed:()async{varweatherData=awaitweather.getLocationWeather();updateUI(weatherData);//weather.getLocationWeath

dart - Flutter:_InternalLinkedHashMap 没有实例 > 方法 'cast'

Sthg让我发疯,我尝试在卡片中显示json产品,但它不起作用。到目前为止,这是我尝试过的:产品类别:classProduct{finalStringid;Product({this.id});factoryProduct.fromJson(Mapjson){returnnewProduct(id:json['id']asString);}}JSON:FutureloadProducts()async{finalresponse=awaithttp.get('https://api.stripe.com/v1/products');returnresponse.body;}json具有

json - InternalLinkedHashMap<String, dynamic >' is not a subtype of type ' FutureOr<List<dynamic> 尝试解析 JSON 时

我通过分步指南学习了Flutter。因此,当我使用指南中的代码时-它运行良好,但当我尝试更改JSONURL时,出现错误。据我了解,JSON格式和jsonDecode的问题就是无法解码RIOTJSON,但如何解决呢?List_games=awaitgetGames();FuturegetGames()async{//NotworkingwiththisJSONURLStringapiUrl='https://euw1.api.riotgames.com/lol/match/v4/matchlists/by-account/UZs5l9TT7GLEPfoOZ1eTMqqyJEomgmUHu

dart - 如何修复此错误 : '_InternalLinkedHashMap<dynamic, dynamic>' is not a subtype of type 'Map<String, dynamic>'

我尝试在我的flutter应用程序中解析来自Firestore的文档。Firestore文档:我创建了两个类来解析这个文档。类产品:classProdukt{Stringname;intanzahl;Produkt({this.name,this.anzahl,});factoryProdukt.fromJson(MapparsedJson){returnProdukt(name:parsedJson['Name'],anzahl:parsedJson['Anzahl']);}}类产品列表:classProduktList{finalListprodukte;ProduktList({

json - _InternalLinkedHashMap<String, dynamic> 类型不是 List<dynamic> 类型的子类型

我正在尝试使用网络调用实现一个简单的新闻提要应用程序,其中屏幕将在ListView中显示最新的故事。使用当前代码,我从API获得了响应(因为我在日志中看到了整个响应主体),但似乎无法在UI中显示数据。我收到此错误:type_InternalLinkedHashMapisnotsubtypeoftypeList这是JSON结构{"response":{"status":"ok","userTier":"developer","total":25095,"startIndex":1,"pageSize":10,"currentPage":1,"pages":2510,"orderBy":"

android - Flutter: InternalLinkedHashMap<String, dynamic >' has no instance method ' cast' with matching arguments

我无法从之前的问题中找到解决方案,我已将json字符串转换为map下面是我的API调用方法。FuturefetchEvent()async{//hereichangeFuturetypeStringurl='http://xxxxxxxxxxxx.tk/api/userapp/event/lists';varheaders=newMap();//hereidefinedMaptypeheaders['Auth-Key']='OCDOC@2018';headers['End-Client']='OCDOC';varbody=newMap();//hereidefinedMaptypehe