如何解决它数据不显示在颤抖的列表中 [英] how to fix it Data not showing in list in flutter
本文介绍了如何解决它数据不显示在颤抖的列表中的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想显示一个数据列表来解析JSON，我已经编写了所有代码，但是数据没有显示在listview中，我不明白我的代码有什么错误.我正在分享我的密码.plz向我建议
I want to show a list of data to parse the JSON, I have written all the codes but data not show in listview I don't understand what is the mistake in my code. I am sharing my codes.plz suggest to me
这是我解析过的JSON
This is JSON which I have parsed
[{"customer_name":"Ridge Valley School的里奇谷"，移动":"9796005602"，" product_id":"47265"，"imei":"868004027863425"，"serial_no":"2016172679"，名称":"L-100 [2G]"，"id":"36"，"complain_no":"11212"，"complain_id":"CMP/160720/11211"，故障":设备未显示\ n"，" mobile_no":"5756200501797"，"customer_product_id":"10514"，" kyc_id" ;: null，"vehicle_no":"HR55R0561"；}]
[ { "customer_name": "ridge_valley, Ridge Valley School", "mobile": "9796005602", "product_id": "47265", "imei": "868004027863425", "serial_no": "2016172679", "name": "L-100 [2G] ", "id": "36", "complain_no": "11212", "complain_id": "CMP/160720/11211", "fault": "device not showing\n", "mobile_no": "5756200501797", "customer_product_id": "10514", "kyc_id": null, "vehicle_no": "HR55R0561" } ]
这是我的代码.
import 'package:deviceinstallation/complaint.dart';
import 'package:deviceinstallation/ordercountdetail.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:http/http.dart' as http;
import 'dashboard_screen.dart';
import 'model/complaint_count_model.dart';
//void main()=> runApp(ComplaintCountDetails());
class ComplaintCountDetails extends StatelessWidget{
String cID;
ComplaintCountDetails(this.cID);
@override
Widget build(BuildContext context) {
// TODO: implement build
print("id"+cID);
return MaterialApp(
debugShowCheckedModeBanner: false,
title: "FLutter Demo",
theme: ThemeData(
primarySwatch: Colors.blue
),
home: ComplaintCountDetailsScreen(cID: cID,),
);
}
}
class ComplaintCountDetailsScreen extends StatefulWidget {
//final String title;
String cID;
//ComplaintCountDetailsScreen({this.cID});
ComplaintCountDetailsScreen({Key key, this.cID}): super(key: key);
@override
ComplaintCountStates createState() => ComplaintCountStates(cID);
}
class ComplaintCountStates extends State<ComplaintCountDetailsScreen> {
Icon cusIcon =Icon(Icons.search);
Widget cusSearchBar= Text("Complaint List");
String cID;
ComplaintCountStates(this.cID);
String sUrl= "https://fasttracksoft.us/api_v2/device_installation/";
bool isLoading= false;
List<ComplaintCountDetailModel> complaintCountList;
Future<List<ComplaintCountDetails>> getComplaintCountList()async{
setState(() {
isLoading=true;
});
final prefs= await SharedPreferences.getInstance();
var params= "complaindetail.php?id="+prefs.getString('id')+"&cid="+cID;
// print("param:"+params);
try{
var response= await http.get(sUrl+params);
print("sURL:"+sUrl);
print("param:"+params);
// print("response+url_param:$response");
print("customerID:"+prefs.getString('id'));
print("url+params:"+sUrl+params);
if(response.statusCode==200){
complaintCountList=complaintCountDetailModelFromJson(response.body);
print("listJSON:"+complaintCountList.toString());
print(complaintCountList[0].toString());
if(complaintCountList!=null){
setState(() {
isLoading=false;
});
}
}
}catch(e){
//return complaintCountList;
}
}
@override
void initState() {
// TODO: implement initState
super.initState();
setState(() {
isLoading=true;
getComplaintCountList();
});
}
@override
Widget build(BuildContext context) {
// TODO: implement build
return Scaffold(
appBar: AppBar(
leading: IconButton(
icon: Icon(Icons.arrow_back, color: Colors.white),
onPressed: (){
Navigator.push(
context,
MaterialPageRoute(builder: (context) => ComplaintScreen()),
);
},
),
title: cusSearchBar,
actions: <Widget>[
IconButton(
//tooltip: 'Search',
//icon: const Icon(Icons.search),
//Don't block the main thread
onPressed: () {
setState(() {
if(this.cusIcon.icon==Icons.search){
this.cusIcon=Icon(Icons.cancel);
this.cusSearchBar=TextField(
textInputAction: TextInputAction.go,
decoration: InputDecoration(
border: InputBorder.none,
hintText: "Search here",
),
style: TextStyle(
color: Colors.white,
fontSize: 16.0,
),
);
}else{
this.cusIcon =Icon(Icons.search);
this.cusSearchBar= Text("AppBar");
}
});
},
icon: cusIcon,
),
],
),
body:SafeArea(
child: Column(
children: <Widget>[
Container(
padding: const EdgeInsets.fromLTRB(0.0, 5.0, 5.0, 0.0),
height: MediaQuery.of(context).size.height / 15.2,
width: MediaQuery.of(context).size.width * 15.5,
// color: Colors.teal,
child: Text("Customer Name :",
style: TextStyle(
fontSize: 25.0,
fontWeight: FontWeight.bold,
color: Colors.teal
),),
),
Container(
padding: const EdgeInsets.fromLTRB(0.0, 5.0, 5.0, 0.0),
height: MediaQuery.of(context).size.height / 15.2,
width: MediaQuery.of(context).size.width * 15.5,
// color: Colors.teal,
child: Text("Complaint List for Engineer",
style: TextStyle(
fontStyle: FontStyle.italic,
fontSize: 20.0,
color: Colors.teal,
fontWeight: FontWeight.bold
),),
),
Visibility(
maintainSize: true,
maintainAnimation: true,
maintainState: true,
visible: isLoading,
child: Container(
child: CircularProgressIndicator(),
)),
Expanded(
child: ListView.builder(
itemCount: null==complaintCountList ? 0:complaintCountList.length,
itemBuilder: (BuildContext context, index){
ComplaintCountDetailModel countModel= complaintCountList[index];
return Container(
child: Padding(
padding: const EdgeInsets.only(top: 0.0, bottom: 0.0, left: 5.0, right: 5.0),
child: Card(
child: Container(
padding: const EdgeInsets.only(top: 10.0, bottom: 10.0, left: 15.0, right: 15.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
mainAxisSize: MainAxisSize.max,
//crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text('IMEI :'+countModel.imei,
style: TextStyle(
//fontSize: 20.0,
color: Colors.green,
fontWeight: FontWeight.bold,
// backgroundColor: Colors.green
),
),
Text('Complaint ID :'+countModel.id,
style: TextStyle(
// fontSize: 20.0,
color: Colors.black,
// backgroundColor: Colors.green
),
),
Text('Serial No :'+countModel.serialNo,
style: TextStyle(
//fontSize: 20.0,
color: Colors.black,
// backgroundColor: Colors.green
),
),
Text('Customer Name :'+countModel.customerName,
style: TextStyle(
//fontSize: 20.0,
color: Colors.black,
// backgroundColor: Colors.green
),
),
Text('Mobile :'+countModel.mobile,
style: TextStyle(
//fontSize: 20.0,
color: Colors.black,
// backgroundColor: Colors.green
),
),
Text('Device Model :'+countModel.productId,
style: TextStyle(
// fontSize: 20.0,
color: Colors.black,
// backgroundColor: Colors.green
),
),
Text('Vehicle No :'+countModel.vehicleNo,
style: TextStyle(
//fontSize: 20.0,
color: Colors.black,
// backgroundColor: Colors.green
),
),
Text('Complaint issue :'+countModel.fault,
style: TextStyle(
//fontSize: 20.0,
color: Colors.black,
// backgroundColor: Colors.green
),
),
],
),
),
),
),
);
}
))
],
))
);
}
}
推荐答案
创建一个类以解码json对象.为此，可以在[https://app.quicktype.io/]
Create a class to decode the json object. To do this easily paste your json here [https://app.quicktype.io/]
List<DecoderClass> decoderClassFromJson(String str) =>
List<DecoderClass>.from(json.decode(str).map((x) => DecoderClass.fromJson(x)));
String decoderClassToJson(List<DecoderClass> data) => json.encode(List<dynamic>.from(data.map((x) => x.toJson())));
class DecoderClass {
DecoderClass({
this.customerName,
this.mobile,
this.productId,
this.imei,
this.serialNo,
this.name,
this.id,
this.complainNo,
this.complainId,
this.fault,
this.mobileNo,
this.customerProductId,
this.kycId,
this.vehicleNo,
});
final String customerName;
fina
l String mobile;
final String productId;
final String imei;
final String serialNo;
final String name;
final String id;
final String complainNo;
final String complainId;
final String fault;
final String mobileNo;
final String customerProductId;
final dynamic kycId;
final String vehicleNo;
factory DecoderClass.fromJson(Map<String, dynamic> json) => DecoderClass(
customerName: json["customer_name"],
mobile: json["mobile"],
productId: json["product_id"],
imei: json["imei"],
serialNo: json["serial_no"],
name: json["name"],
id: json["id"],
complainNo: json["complain_no"],
complainId: json["complain_id"],
fault: json["fault"],
mobileNo: json["mobile_no"],
customerProductId: json["customer_product_id"],
kycId: json["kyc_id"],
vehicleNo: json["vehicle_no"],
);
Map<String, dynamic> toJson() => {
"customer_name": customerName,
"mobile": mobile,
"product_id": productId,
"imei": imei,
"serial_no": serialNo,
"name": name,
"id": id,
"complain_no": complainNo,
"complain_id": complainId,
"fault": fault,
"mobile_no": mobileNo,
"customer_product_id": customerProductId,
"kyc_id": kycId,
"vehicle_no": vehicleNo,
};
}
然后将其传递给将来的功能
Then pass this to a future Function
Future<DecoderClass> _future;
Future<DecoderClass> getData() async {
final http.Response response = await http.get(
'https://fasttracksoft.us/api_v2/device_installation/',
);
if (response.statusCode < 200 ||
response.statusCode > 400 ||
json == null) {
throw new Exception("Error while fetching data");
} else {
return DecodeClass.fromJson(json.decode(response.body));
}
}
@override
void initState() {
super.initState();
_future = getData();
}
使用将来的建造者来接收此类
use a future builder to receive this class
FutureBuilder<DecodeClass>(
future: _future,
builder: (context, snapshot) {
return ListView.builder(
shrinkWrap: true,
itemBuilder: (context, i) {})})
这篇关于如何解决它数据不显示在颤抖的列表中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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