我尝试重新加载奖励视频广告，当我调用RewardedVideoAd.instance.load(adUnitId:"xxx",targetingInfo:xyz);我发现以下错误:W/MessageQueue(13672):Handler(android.os.Handler){1a13e8a}sendingmessagetoaHandleronadeadthreadW/MessageQueue(13672):java.lang.IllegalStateException:Handler(android.os.Handler){1a13e8a}sendingmessagetoaHand
我正在使用flutter向api发送请求，并将响应值保存在我的一个模型的实例中。但我收到一些奇怪的错误。您可以在下面看到我的代码和错误。我正在使用scoped_model进行状态管理。import'dart:convert';import'dart:async';import'dart:io';import'package:shared_preferences/shared_preferences.dart';import'package:scoped_model/scoped_model.dart';import'package:http/http.dart'ashttp;impor
我正在使用flutter向api发送请求，并将响应值保存在我的一个模型的实例中。但我收到一些奇怪的错误。您可以在下面看到我的代码和错误。我正在使用scoped_model进行状态管理。import'dart:convert';import'dart:async';import'dart:io';import'package:shared_preferences/shared_preferences.dart';import'package:scoped_model/scoped_model.dart';import'package:http/http.dart'ashttp;impor
我在User类构造函数中包含一个枚举。类中的该字段在新实例中变为null。我直接设置枚举值。之后我打印类(class)字段。为空。enumGenders{MALE,FEMALE,OTHER}classUserextendsSharedUser{User(StringfirstName,Gendersgender,):super(firstName:firstName);Gendersgender;}finalUseruser=User('Bob',Genders.OTHER);print(user.firstName);//Bobprint(user.gender);//null预期:
我在User类构造函数中包含一个枚举。类中的该字段在新实例中变为null。我直接设置枚举值。之后我打印类(class)字段。为空。enumGenders{MALE,FEMALE,OTHER}classUserextendsSharedUser{User(StringfirstName,Gendersgender,):super(firstName:firstName);Gendersgender;}finalUseruser=User('Bob',Genders.OTHER);print(user.firstName);//Bobprint(user.gender);//null预期:
我在pubspec.yaml中插入了下面的库google_maps_flutter:git:url:git://github.com/flutter/pluginspath:packages/google_maps_flutter但是每次都报错另一个异常被抛出:'file:///C:/src/flutter/.pub-cache/git/plugins-aedcc6f81843ae2da3a6ac0c8e8c4b530d1ac035/packages/google_maps_flutter/lib/src/google_map.dart':断言失败:line24pos15:'initi
我在pubspec.yaml中插入了下面的库google_maps_flutter:git:url:git://github.com/flutter/pluginspath:packages/google_maps_flutter但是每次都报错另一个异常被抛出:'file:///C:/src/flutter/.pub-cache/git/plugins-aedcc6f81843ae2da3a6ac0c8e8c4b530d1ac035/packages/google_maps_flutter/lib/src/google_map.dart':断言失败:line24pos15:'initi
之前我在我的main.dart中初始化我的PersonBlocProviderreturnPersonBlocProvider(personBloc:PersonBloc(this._apiInterface),child:AlarmBlocProvider(alarmBloc:AlarmBloc(this._apiInterface),child:EventBlocProvider(eventBloc:EventBloc(this._apiInterface),child:MaterialApp(title:'HatMobile',theme:ThemeData(primarySwa
之前我在我的main.dart中初始化我的PersonBlocProviderreturnPersonBlocProvider(personBloc:PersonBloc(this._apiInterface),child:AlarmBlocProvider(alarmBloc:AlarmBloc(this._apiInterface),child:EventBlocProvider(eventBloc:EventBloc(this._apiInterface),child:MaterialApp(title:'HatMobile',theme:ThemeData(primarySwa
来自面向对象的编程背景，我计划制作一个专门的设置类来存储有关应用程序的某些基本数据。我计划从使用SharedPreferences和LocalStorage保存应用程序的主题开始。但是，SharedPreferences.getInstance()似乎总是返回null。我试过简单地运行，在Debug模式下运行，使用单独的异步方法来加载SharedPreferences并返回一个使用.then()展开的Future。我似乎无法弄清楚为什么我总是从我编写的AppSettings.getInstance()方法中的SharedPreferences.getInstance()得到null。i
