You can copy paste run full code below
assume your response JSON string like this, it's array
[
{
"status": 200,
"msg": "Ok",
"rows": [
{
"lid": "11031",
"CompanyName": "WALLS ICE CREAM",
"LeadSourceName": "Website",
"LeadSourceValue": "ONLINE ADS"
},
{
"lid": "11032",
"CompanyName": "WALLS ICE CREAM",
"LeadSourceName": "Website",
"LeadSourceValue": "ONLINE ADS"
},
{
"lid": "11034",
"CompanyName": "WALLS ICE CREAM",
"LeadSourceName": "Website",
"LeadSourceValue": "ONLINE ADS"
}
],
"sql": "gg",
"reserved": null
}
]
you can parse with related class
// To parse this JSON data, do
//
// final payload = payloadFromJson(jsonString);
import 'dart:convert';
List<Payload> payloadFromJson(String str) => List<Payload>.from(json.decode(str).map((x) => Payload.fromJson(x)));
String payloadToJson(List<Payload> data) => json.encode(List<dynamic>.from(data.map((x) => x.toJson())));
class Payload {
int status;
String msg;
List<Row> rows;
String sql;
dynamic reserved;
Payload({
this.status,
this.msg,
this.rows,
this.sql,
this.reserved,
});
factory Payload.fromJson(Map<String, dynamic> json) => Payload(
status: json["status"],
msg: json["msg"],
rows: List<Row>.from(json["rows"].map((x) => Row.fromJson(x))),
sql: json["sql"],
reserved: json["reserved"],
);
Map<String, dynamic> toJson() => {
"status": status,
"msg": msg,
"rows": List<dynamic>.from(rows.map((x) => x.toJson())),
"sql": sql,
"reserved": reserved,
};
}
class Row {
String lid;
String companyName;
String leadSourceName;
String leadSourceValue;
Row({
this.lid,
this.companyName,
this.leadSourceName,
this.leadSourceValue,
});
factory Row.fromJson(Map<String, dynamic> json) => Row(
lid: json["lid"],
companyName: json["CompanyName"],
leadSourceName: json["LeadSourceName"],
leadSourceValue: json["LeadSourceValue"],
);
Map<String, dynamic> toJson() => {
"lid": lid,
"CompanyName": companyName,
"LeadSourceName": leadSourceName,
"LeadSourceValue": leadSourceValue,
};
}
and show ListView with
loading == true
? CircularProgressIndicator()
: Expanded(
flex: 1,
child: ListView.builder(
padding: const EdgeInsets.all(8),
itemCount: payloadList == null ? 0 : payloadList[0].rows.length,
itemBuilder: (BuildContext context, int index) {
return Container(
height: 50,
child: Center(
child: Text(
'lid ${payloadList[0].rows[index].lid}')),
);
}),
),
working demo
full code
import 'package:flutter/material.dart';
// To parse this JSON data, do
//
// final payload = payloadFromJson(jsonString);
import 'dart:convert';
List<Payload> payloadFromJson(String str) =>
List<Payload>.from(json.decode(str).map((x) => Payload.fromJson(x)));
String payloadToJson(List<Payload> data) =>
json.encode(List<dynamic>.from(data.map((x) => x.toJson())));
class Payload {
int status;
String msg;
List<Row> rows;
String sql;
dynamic reserved;
Payload({
this.status,
this.msg,
this.rows,
this.sql,
this.reserved,
});
factory Payload.fromJson(Map<String, dynamic> json) => Payload(
status: json["status"],
msg: json["msg"],
rows: List<Row>.from(json["rows"].map((x) => Row.fromJson(x))),
sql: json["sql"],
reserved: json["reserved"],
);
Map<String, dynamic> toJson() => {
"status": status,
"msg": msg,
"rows": List<dynamic>.from(rows.map((x) => x.toJson())),
"sql": sql,
"reserved": reserved,
};
}
class Row {
String lid;
String companyName;
String leadSourceName;
String leadSourceValue;
Row({
this.lid,
this.companyName,
this.leadSourceName,
this.leadSourceValue,
});
factory Row.fromJson(Map<String, dynamic> json) => Row(
lid: json["lid"],
companyName: json["CompanyName"],
leadSourceName: json["LeadSourceName"],
leadSourceValue: json["LeadSourceValue"],
);
Map<String, dynamic> toJson() => {
"lid": lid,
"CompanyName": companyName,
"LeadSourceName": leadSourceName,
"LeadSourceValue": leadSourceValue,
};
}
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
// This is the theme of your application.
//
// Try running your application with "flutter run". You'll see the
// application has a blue toolbar. Then, without quitting the app, try
// changing the primarySwatch below to Colors.green and then invoke
// "hot reload" (press "r" in the console where you ran "flutter run",
// or simply save your changes to "hot reload" in a Flutter IDE).
// Notice that the counter didn't reset back to zero; the application
// is not restarted.
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
// This widget is the home page of your application. It is stateful, meaning
// that it has a State object (defined below) that contains fields that affect
// how it looks.
// This class is the configuration for the state. It holds the values (in this
// case the title) provided by the parent (in this case the App widget) and
// used by the build method of the State. Fields in a Widget subclass are
// always marked "final".
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
List<Payload> payloadList;
bool loading = false;
String jsonString = '''
[
{
"status": 200,
"msg": "Ok",
"rows": [
{
"lid": "11031",
"CompanyName": "WALLS ICE CREAM",
"LeadSourceName": "Website",
"LeadSourceValue": "ONLINE ADS"
},
{
"lid": "11032",
"CompanyName": "WALLS ICE CREAM",
"LeadSourceName": "Website",
"LeadSourceValue": "ONLINE ADS"
},
{
"lid": "11034",
"CompanyName": "WALLS ICE CREAM",
"LeadSourceName": "Website",
"LeadSourceValue": "ONLINE ADS"
}
],
"sql": "gg",
"reserved": null
}
]
''';
void _incrementCounter() {
setState(() {
loading = true;
payloadList = payloadFromJson(jsonString);
loading = false;
// This call to setState tells the Flutter framework that something has
// changed in this State, which causes it to rerun the build method below
// so that the display can reflect the updated values. If we changed
// _counter without calling setState(), then the build method would not be
// called again, and so nothing would appear to happen.
_counter++;
});
}
@override
Widget build(BuildContext context) {
// This method is rerun every time setState is called, for instance as done
// by the _incrementCounter method above.
//
// The Flutter framework has been optimized to make rerunning build methods
// fast, so that you can just rebuild anything that needs updating rather
// than having to individually change instances of widgets.
return Scaffold(
appBar: AppBar(
// Here we take the value from the MyHomePage object that was created by
// the App.build method, and use it to set our appbar title.
title: Text(widget.title),
),
body: Center(
// Center is a layout widget. It takes a single child and positions it
// in the middle of the parent.
child: Column(
// Column is also a layout widget. It takes a list of children and
// arranges them vertically. By default, it sizes itself to fit its
// children horizontally, and tries to be as tall as its parent.
//
// Invoke "debug painting" (press "p" in the console, choose the
// "Toggle Debug Paint" action from the Flutter Inspector in Android
// Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
// to see the wireframe for each widget.
//
// Column has various properties to control how it sizes itself and
// how it positions its children. Here we use mainAxisAlignment to
// center the children vertically; the main axis here is the vertical
// axis because Columns are vertical (the cross axis would be
// horizontal).
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
loading == true
? CircularProgressIndicator()
: Expanded(
flex: 1,
child: ListView.builder(
padding: const EdgeInsets.all(8),
itemCount: payloadList == null ? 0 : payloadList[0].rows.length,
itemBuilder: (BuildContext context, int index) {
return Container(
height: 50,
child: Center(
child: Text(
'lid ${payloadList[0].rows[index].lid}')),
);
}),
),
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.display1,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
}
