I am facing this problem
E/flutter ( 3688): [ERROR:flutter/lib/ui/ui_dart_state.cc(198)] Unhandled Exception: type '_InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'Iterable'
I want to get data from the api in listview bilder. but this exception which i am not familiar with. How to solve it i donot know.
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:learning_1ui_6228/utilities/app_colors.dart';
import 'package:learning_1ui_6228/utilities/helper.dart';
import 'package:learning_1ui_6228/utilities/widgets/app_line.dart';
import 'package:learning_1ui_6228/utilities/widgets/list_tile_widget.dart';
import 'package:learning_1ui_6228/views/nav_pages/profile_page.dart';
import 'package:http/http.dart' as http;
import '../model/UserModel.dart';
class FirstScreen extends StatefulWidget {
const FirstScreen({Key? key}) : super(key: key);
@override
State<FirstScreen> createState() => _FirstScreenState();
}
class _FirstScreenState extends State<FirstScreen> {
Future<UserModel>? futureUser;
TextEditingController textController = TextEditingController();
// List<UserModel> userList=[];
@override
void initState() {
getData();
super.initState();
}
List<UserModel> userModelList=[];
Future<List<UserModel>> getData () async {
final response=await http.get(Uri.parse('https://reqres.in/api/users?page=2'));
var data = jsonDecode(response.body.toString());
if(response.statusCode==200){
for(Map i in data){
userModelList.add(UserModel.fromJson(data[i]));
}
print('User Data list ${userModelList}');
return userModelList;
}else {
return [];
}
}
@override
Widget build(BuildContext context) {
print('user list ModelListdata $userModelList');
return SafeArea(
child: Scaffold(
backgroundColor: Color(0xfff8f8fa),
body: Column(
children: [
//1st Section
Container(
height: HelperClass.h250,
decoration: BoxDecoration(
gradient: LinearGradient(
colors: AppColors.gradientColor,
),
borderRadius: BorderRadius.only(
bottomRight: Radius.circular(HelperClass.r10),
bottomLeft: Radius.circular(HelperClass.r10))),
child: Column(
children: <Widget>[
//Text and cross button
Container(
margin: EdgeInsets.only(
left: HelperClass.w10,
right: HelperClass.w10,
top: HelperClass.h20),
height: HelperClass.h50,
// color: Colors.red,
child: Row(
mainAxisAlignment: MainAxisAlignment.start,
children: [
Container(
child: IconButton(
onPressed: () {},
icon: Icon(
Icons.clear,
color: Colors.white,
size: 30,
))),
Expanded(
child: Container(
margin: EdgeInsets.only(right: 30),
alignment: Alignment.center,
// color: Colors.lightBlueAccent,
child: Text(
'Search',
style: TextStyle(
fontSize: HelperClass.t25,
fontWeight: FontWeight.bold,
color: Colors.white),
),
),
),
],
),
),
SizedBox(
height: HelperClass.h25,
),
//Search Bar
Container(
margin: EdgeInsets.only(
left: HelperClass.w10, right: HelperClass.w10),
//color: Colors.amber,
height: HelperClass.h70,
width: double.infinity,
child: TextField(
controller: textController,
onChanged: (name) {
setState(() {
// searchUser(name);
});
},
decoration: InputDecoration(
prefix: Icon(
Icons.search,
size: 26,
),
suffix: IconButton(
onPressed: () {
setState(() {
textController.clear();
//searchedList = userList;
});
},
icon: Icon(
Icons.clear,
size: 26,
),
),
hintText: 'Search',
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(3),
borderSide: BorderSide.none,
),
filled: true,
fillColor: Colors.white,
),
),
),
],
),
),
// List View
Expanded(
child: FutureBuilder(
future: getData(),
builder: (context, snapshot){
if(snapshot.hasData){
return ListView.builder(
itemCount: userModelList.length,
shrinkWrap: true,
itemBuilder: (context, index) {
return Padding(
padding: EdgeInsets.all(10),
child: Column(
children: [
InkWell(
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => ProfilePage(
// userName:snapshot.data!.data![index].firstName??'',
userName: userModelList[index].data![index].firstName??'',
//followers: snapshot.data!.data![index].id.toString(),
followers: userModelList[index].data![index].id.toString()??'N/A',
// address: snapshot.data!.data![index].email.toString(),
address: userModelList[index].data![index].email??'',
//following: snapshot.data!.data![index].lastName.toString(),
following: userModelList[index].data![index].lastName,
//imageUrl: snapshot.data!.data![index].avatar.toString(),
imageUrl: userModelList[index].data![index].avatar??'N/A',
),
));
},
child: ListTileWidgets(
following:userModelList[index].data![index].lastName,
address: userModelList[index].data![index].email??'',
imageUrl:userModelList[index].data![index].avatar??'N/A',
name: userModelList[index].data![index].firstName??'',
followersCount:
'Followers: ${userModelList[index].data![index].lastName}',
iconWidget: Icon(
Icons.person_add_alt_outlined,
color: Colors.red,
size: 25,
),
),
),
AppLine(
paddingLeft: 10,
paddingRight: 10,
heightLine: 1,
lineColor: Colors.grey),
],
),
);
},
);
}
else if (snapshot.hasError) {
return Text('${snapshot.error}');
}
// By default, show a loading spinner.
return Center(child: CircularProgressIndicator());
}),
),
],
),
),
);
}
}
**This is my data model
import 'dart:convert';
UserModel userModelFromJson(String str) => UserModel.fromJson(json.decode(str));
String userModelToJson(UserModel data) => json.encode(data.toJson());
class UserModel {
UserModel({
this.page,
this.perPage,
this.total,
this.totalPages,
this.data,
this.support,});
UserModel.fromJson(dynamic json) {
page = json['page'];
perPage = json['per_page'];
total = json['total'];
totalPages = json['total_pages'];
if (json['data'] != null) {
data = [];
json['data'].forEach((v) {
data?.add(Data.fromJson(v));
});
}
support = json['support'] != null ? Support.fromJson(json['support']) : null;
}
int? page;
int? perPage;
int? total;
int? totalPages;
List<Data>? data;
Support? support;
Map<String, dynamic> toJson() {
final map = <String, dynamic>{};
map['page'] = page;
map['per_page'] = perPage;
map['total'] = total;
map['total_pages'] = totalPages;
if (data != null) {
map['data'] = data?.map((v) => v.toJson()).toList();
}
if (support != null) {
map['support'] = support?.toJson();
}
return map;
}
}
Support supportFromJson(String str) => Support.fromJson(json.decode(str));
String supportToJson(Support data) => json.encode(data.toJson());
class Support {
Support({
this.url,
this.text,});
Support.fromJson(dynamic json) {
url = json['url'];
text = json['text'];
}
String? url;
String? text;
Map<String, dynamic> toJson() {
final map = <String, dynamic>{};
map['url'] = url;
map['text'] = text;
return map;
}
}
Data dataFromJson(String str) => Data.fromJson(json.decode(str));
String dataToJson(Data data) => json.encode(data.toJson());
class Data {
Data({
this.id,
this.email,
this.firstName,
this.lastName,
this.avatar,});
Data.fromJson(dynamic json) {
id = json['id'];
email = json['email'];
firstName = json['first_name'];
lastName = json['last_name'];
avatar = json['avatar'];
}
int? id;
String? email;
String? firstName;
String? lastName;
String? avatar;
Map<String, dynamic> toJson() {
final map = <String, dynamic>{};
map['id'] = id;
map['email'] = email;
map['first_name'] = firstName;
map['last_name'] = lastName;
map['avatar'] = avatar;
return map;
}
}
This is my api call https://reqres.in/api/users?page=2
CodePudding user response：
The issue is you are reading a single map here.
Do it like
Future<List<UserModel>> getData() async {
final response =
await http.get(Uri.parse('https://reqres.in/api/users?page=2'));
if (response.statusCode == 200) {
var data = jsonDecode(response.body);
userModelList.add(UserModel.fromJson(data));
return userModelList;
} else {
return [];
}
}
CodePudding user response：
Haven't tested it, but I think the problem is here:
Future<List<UserModel>> getData () async {
final response=await http.get(Uri.parse('https://reqres.in/api/users?page=2'));
var data = jsonDecode(response.body.toString());
if(response.statusCode==200){
for(Map i in data){
userModelList.add(UserModel.fromJson(data[i]));
}
print('User Data list ${userModelList}');
return userModelList;
}else {
return [];
}
}
data is a map according to the response, which is not iterable. In other words, you cannot do for (var i in data) since only Iterables can be used in such a format.
Instead, it looks like the entire data is ONE UserModel, and you should be able to just decode data itself as an UserModel. I didn't see multiple users in the API response.