我的代码中有这个错误。 [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: type '_InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'FutureOr<List<dynamic>>' 下面是我的代码: Future<List> getmatches() async{
String url="https://cricapi.com/api/
我在实时数据库中有这样的数据:
我想要拿到examQuestion
当我用这个
Future<void> restApiExam() async{
var url= 'https://taw3ia-ac6b2.firebaseio.com/Exam.json';
try{
final response = await http.get(url);
final extractedData = json.decode(response.body) as Map<String, dynamic>;
fi
下面是响应
{
"overview": "A ticking-time-bomb insomniac and a slippery soap salesman channel primal male aggression into a shocking new form of therapy. Their concept catches on, with underground "fight clubs" forming in every town, until an eccentric gets in the way and ignites an ou
使用Flutter http包调用http.get时,会抛出以下异常: Unhandled Exception: Unhandled error type '_InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'Map<String, String>' occurred in bloc Instance of 'AccountsBloc'. 抛出异常的代码 final response = await http.get(
serverCo
我尝试通过从服务器获取json响应来调用数据。
Future<List<Users>> getUserLogin() async{
String url= login_url;
var res = await http.get(url);
if(res.statusCode==200){
var list = json.decode(res.body) as List;
print(list);
List<Users> users = list.map((i)=>Users.fromJson(i)).toLi
我想解析一个由数组组成的复杂JSON API,它显示了以下错误。API有天气的详细信息,我想在控制台中显示时间和波高。
错误
E/flutter ( 5675): [ERROR:flutter/lib/ui/ui_dart_state.cc(186)] Unhandled Exception: type '_InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'List<dynamic>'
E/flutter ( 5675): #0 _JsonDem
我试图使用显示一个使用fromJson工厂的tweet列表。
每个tweet对象都有一个extended_entities对象,它是media对象的数组。
如果您不熟悉,可以看到所有不同的对象( )。
以下是我为实现这一目标而创建的模型:
class Tweet {
final String createdAt;
final int id;
final String idStr;
final String text;
final String inReplyToStatusIdStr;
final String inReplyToUserIdStr;
final
这可能需要一段时间。我一直在尝试让我的Dart/Flutter代码从返回数据(特别是,我希望看到来自AUD行的所有内容),并将其留在调试控制台中。当我这样做的时候,我从控制台得到了这个错误
E/flutter ( 8656): [ERROR:topaz/lib/tonic/logging/dart_error.cc(16)] Unhandled exception:
E/flutter ( 8656): type '_InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'List&
我在将地图转换为DART上的列表时遇到问题。
下面是我的代码:
try {
var response = await http.get(url, headers: header);
List listaResponse = jsonDecode(response.body);
final lockers = <Locker>[];
for (Map map in listaResponse) {
Locker l = Locker.fromJson(map);
lockers.add(l);
import 'dart:convert';
import 'package:flutter/foundation.dart';
import 'package:http/http.dart' as http;
import './cart.dart';
class OrderItem {
final String id;
final double amount;
final List<CartItem> products;
final DateTime dateTime;
OrderItem