我试图从我的 Future 函数中创建的列表中访问 fullName，但无法做到。我通过索引进行了尝试，这种方法我已经尝试过 snapshot.data.fullName，但仍然无法检索数据，即使从 future 函数返回后我也遇到了问题。
下面是用户模型的代码
class User {
final String fullname;
final String contactno;
final String address;
final String city;
final String gender;
final String email;
User(this.fullname, this.contactno, this.address, this.city, this.gender, this.email);
factory User.fromMap(Map<String, dynamic> json) {
return User(
json['fullname'],
json['contactno'],
json['address'],
json['city'],
json['gender'],
json['email']
);
}
}
有状态的类代码
class EditProfile extends StatefulWidget {
// final String user_fullname;
// //const EditProfile(this.user_fullname);
// const EditProfile ({ Key key, this.user_fullname}): super(key: key);
@override
_EditProfileState createState() => _EditProfileState();
}
Future<List<User>> getData() async {
var id = "26";
var url = baseurl + patientData + id;
var data;
var rest;
print('Calling uri: $url');
// 4
http.Response response = await http.get(url);
// 5
if (response.statusCode == 200) {
data = response.body;
print(data);
} else {
print(response.statusCode);
}
//Map<String, dynamic> user = jsonDecode(data);
var jsonData = jsonDecode(data.body);
List<User> users = [];
for (var u in jsonData) {
User user = User(u['fullname'], u['contactno'], u['address'], u['city'], u['gender'], u['email']);
users.add(user);
}
// print(users.length.toString);
}
我想在文本小部件的未来函数中访问上面列表中的 fullName，我在下面使用了 snapshot.data.fullName
class _EditProfileState extends State<EditProfile> {
@override
void initState() {
super.initState();
getData();
}
@override
Widget build(BuildContext context) {
getData().then((value) {
print(value);
});
return FutureBuilder(
future: getData(),
// ignore: missing_return
builder: (context, snapshot) {
if (snapshot.hasData) {
return WillPopScope(
onWillPop: () {},
child: Scaffold(
appBar: AppBar(title: Text("Your Profile"), automaticallyImplyLeading: false, actions: <Widget>[
IconButton(
icon: Icon(
Icons.logout,
color: Colors.white,
),
onPressed: () {
Navigator.push(context, MaterialPageRoute(builder: (context) => PatientDashboard()));
},
)
]),
body: SingleChildScrollView(
child: Container(
// color: Colors.pink,
child: Column(
children: [
Center(
child: Padding(
padding: const EdgeInsets.only(top: 18.0),
child: Container(
// color: kPrimaryLightColor,
child: Stack(
children: [
//Image
CircleAvatar(
radius: 100,
backgroundColor: Colors.red[900],
child: CircleAvatar(
radius: 95,
backgroundImage: _pic == null ? AssetImage("assets/images/doctor2.jpg") : FileImage(_pic),
),
),
Positioned(
bottom: 5,
right: 15,
child: CircleAvatar(
backgroundColor: Colors.cyanAccent,
child: GestureDetector(
onTap: () {
setState(() {
//firstname = widget.user_fullname;
getImage();
state = 19;
});
},
child: Icon(Icons.camera_alt)),
radius: 20,
),
)
],
),
),
),
),
//Name
Container(
width: double.infinity,
//color: Colors.grey[400],
child: Stack(
children: [
Center(
child: Padding(
padding: const EdgeInsets.only(left: 18.0, top: 20),
child: Container(
//color: Colors.cyan[50],
width: MediaQuery.of(context).size.width * 0.78,
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text("Name"),
Padding(
padding: const EdgeInsets.only(top: 2.0),
child: state == 1
? TextField(
decoration: InputDecoration(border: InputBorder.none, hintText: "${snapshot.data}", hintStyle: TextStyle(fontSize: 17, fontWeight: FontWeight.bold)), //style: TextStyle(under),
onChanged: (text) {
firstname = text;
},
)
: Text(
snapshot.data.fullName,
style: TextStyle(fontSize: 17, fontWeight: FontWeight.bold),
),
)],
else {
return Center(child: CircularProgressIndicator());
}
},
);
}
}
但我收到此错误
Error: NoSuchMethodError: 'body'
method not found
```
Arguments: []
at Object.throw_ [as throw] (http://localhost:59886/dart_sdk.js:5333:11)
at Object.defaultNoSuchMethod (http://localhost:59886/dart_sdk.js:5778:15)
at String.noSuchMethod (http://localhost:59886/dart_sdk.js:6878:19)
at Object.noSuchMethod (http://localhost:59886/dart_sdk.js:5774:30)
at Object.dload (http://localhost:59886/dart_sdk.js:5395:17)
at getData (http://localhost:59886/packages/newfypapproach/patient/screens/patientForgotPassword.dart.lib.js:12720:64)
at getData.next (<anonymous>)
at http://localhost:59886/dart_sdk.js:39031:33
at _RootZone.runUnary (http://localhost:59886/dart_sdk.js:38888:58)
at _FutureListener.thenAwait.handleValue (http://localhost:59886/dart_sdk.js:33874:29)
at handleValueCallback (http://localhost:59886/dart_sdk.js:34434:49)
at Function._propagateToListeners (http://localhost:59886/dart_sdk.js:34472:17)
at _Future.new.[_completeWithValue] (http://localhost:59886/dart_sdk.js:34314:23)
at async._AsyncCallbackEntry.new.callback (http://localhost:59886/dart_sdk.js:34337:35)
at Object._microtaskLoop (http://localhost:59886/dart_sdk.js:39175:13)
at _startMicrotaskLoop (http://localhost:59886/dart_sdk.js:39181:13)
at http://localhost:59886/dart_sdk.js:34688:9
```
我使用了这种不同的方法来创建一个返回字符串列表的未来函数，并且该列表可以完美地包含所有值。
```
Future<List<String>> getData() async {
var id = "26";
var url = baseurl + patientData + id;
var data;
var rest;
print('Calling uri: $url');
// 4
http.Response response = await http.get(url);
// 5
if (response.statusCode == 200) {
data = response.body;
print(data);
// rest = data['result'] as List;
// print(rest);
//print(data);
} else {
print(response.statusCode);
}
Map<String, dynamic> user = jsonDecode(data);
// var name = user['result']['name'];
String fullName = user['result'][0][0];
String contactNo = user['result'][0][1];
String address = user['result'][0][2];
String city = user['result'][0][3];
String gender = user['result'][0][4];
String email = user['result'][0][5];
return <String>[fullName, contactNo, address, city, gender, email];
}
答案 0 :(得分：0)
如下更改您的 getData
Future<List<User>> getData() async {
var id = "26";
var url = baseurl + patientData + id;
Map<String, dynamic> data ={};
var rest;
// 4
http.Response response = await http.get(url);
// 5
if (response.statusCode == 200) {
data = response.body;
print(data);
} else {
print(response.statusCode);
}
//Map<String, dynamic> user = jsonDecode(data);
var jsonData = jsonDecode(data);
List<User> users = [];
for (var u in jsonData) {
User user = User(u['fullname'], u['contactno'], u['address'], u['city'], u['gender'], u['email']);
users.add(user);
}
return users; }