get 메서드 (API 호출)로 Listview 빌더를 만듭니다. API 호출은 괜찮습니다. 응답을받습니다. 하지만 위젯 snapshot.data에서 null을 보여줍니다. 이 문제를 해결할 수 없으며 왜 이렇게 작동하는지 알 수 없습니다. 누군가 나를 도와주세요.
API 응답 본문
다음은 API 호출 코드입니다.
class APIService {
Future<List<EducationInfo>> getEducationInfo() async {
String url = "$baseAPIUrl/educations";
String _token = await SavedData().loadToken();
String authorization = "Bearer $_token";
var response = await http.get(url, headers: {
'Content-Type': 'application/json',
'Accept': 'application/json',
"Authorization": authorization
});
print('API ${response.statusCode}\n API${json.decode(response.body)}');
if (response.statusCode == 200) {
var jsonResponse = response.body;
var decoded = json.decode(jsonResponse);
return decoded['success']
.map<EducationInfo>((b) => EducationInfo.fromJson(b))
.toList();
} else {
throw Exception('Failed to load Education Information');
}
}
}
여기 내 Model.dart가 있습니다.
//Model
class EducationInfo {
int id;
String degreeName;
int rollNumber;
int regNumber;
int passingYear;
String gradeType;
double cgpa;
double outOfCgpa;
String divisionName;
String groupName;
String subjectName;
String boardName;
String instituteName;
EducationInfo({
this.id,
this.degreeName,
this.rollNumber,
this.regNumber,
this.passingYear,
this.gradeType,
this.cgpa,
this.outOfCgpa,
this.divisionName,
this.groupName,
this.subjectName,
this.boardName,
this.instituteName,
});
factory EducationInfo.fromJson(Map<String, dynamic> json) {
return EducationInfo(
id: json['user_id'],
degreeName: json['degree_name'],
rollNumber: json['roll_number'],
regNumber: json['registration_number'],
passingYear: json['passing_year'],
gradeType: json['grade_type'],
cgpa: json['cgpa'],
outOfCgpa: json['out_of_cgpa'],
divisionName: json['division'],
groupName: json['group_name'],
subjectName: json['subject_name'],
boardName: json['board'],
instituteName: json['institute_name'],
);
}
}
그리고 여기 내 주요 코드가 있습니다.
class Resume extends StatefulWidget {
@override
_ResumeState createState() => _ResumeState();
}
class _ResumeState extends State<Resume> {
Future<List<EducationInfo>> furuteEducationInfo;
@override
void initState() {
super.initState();
furuteEducationInfo = APIService().getEducationInfo();
}
@override
Widget build(BuildContext context) {
return Scaffold(
resizeToAvoidBottomPadding: false,
appBar: AppBar(
automaticallyImplyLeading: false,
leading: IconButton(
icon: Icon(
Icons.arrow_back_ios,
),
onPressed: () {
Navigator.pop(context);
},
),
title: Text("Resume"),
),
body: Align(
child: FutureBuilder(
future: furuteEducationInfo,
builder: (context, snapshot) {
var educationInfo = snapshot.data;
if (snapshot.data == null) {
return Text("No Data Available ");
} else if (snapshot.hasData) {
return ListView.builder(
scrollDirection: Axis.vertical,
itemCount: educationInfo.length,
itemBuilder: (context, index) {
var eduInfo = educationInfo[index];
print(
"\nEducation Info ${educationInfo[index]}");
return designedContainer(
_width - 30,
Padding(
padding: EdgeInsets.all(5.0),
child: Stack(
children: [
Container(
child: Column(
children: [
detailsField(
"Degree Name",
"${_checkNull(eduInfo.degreeName)}"),
],
),
),
Align(
alignment:
Alignment.topRight,
child: editButton(
Icons.add, "Delete",
() {
print("Delete");
}),
)
],
),
));
});
} else {
Text("Something Went to Wrong");
}
}),
),
);
}
그리고 여기 또한 우편 배달부 Screenshot-
당신의 EducationInfo.fromJson
방법으로
바꾸다
cgpa: json['cgpa'] ?? 0.0,
outOfCgpa: json['out_of_cgpa'] ?? 0.0,
이 기사는 인터넷에서 수집됩니다. 재 인쇄 할 때 출처를 알려주십시오.
침해가 발생한 경우 연락 주시기 바랍니다[email protected] 삭제
몇 마디 만하겠습니다