Created
December 11, 2020 07:18
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Flutter App to simulate data loading
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import 'package:flutter/material.dart'; | |
void main() => runApp(MyApp()); | |
class MyApp extends StatelessWidget { | |
@override | |
Widget build(BuildContext context) { | |
return MaterialApp( | |
title: 'Flutter Demo', | |
debugShowCheckedModeBanner: false, | |
theme: ThemeData( | |
primarySwatch: Colors.blue, | |
), | |
home: MyHomePage(title: 'Flutter Demo Home Page'), | |
); | |
} | |
} | |
class MyHomePage extends StatefulWidget { | |
MyHomePage({Key key, this.title}) : super(key: key); | |
final String title; | |
@override | |
_MyHomePageState createState() => _MyHomePageState(); | |
} | |
class _MyHomePageState extends State<MyHomePage> { | |
bool _isLoading = true; | |
List<Map<String, dynamic>> _data = []; | |
Future<List<Map<String, dynamic>>> simulatedAPI() async { | |
await Future.delayed(Duration(seconds: 3)); | |
return [ | |
{ | |
"fname": "Arpan", | |
"lname": "Mukherjee" | |
}, | |
{ | |
"fname": "Arnab", | |
"lname": "Sen" | |
}, | |
]; | |
} | |
initState() { | |
super.initState(); | |
loadData(); | |
} | |
loadData() async { | |
setState(() { | |
_isLoading = true; | |
}); | |
var dataTemp = await simulatedAPI(); | |
setState(() { | |
_isLoading = false; | |
_data = dataTemp; | |
}); | |
} | |
@override | |
Widget build(BuildContext context) { | |
return Scaffold( | |
appBar: AppBar( | |
title: Text("Data Loaded App"), | |
), | |
body: Container( | |
child: _isLoading ? Center( | |
child: CircularProgressIndicator(), | |
) : ListView.builder( | |
itemCount: _data.length, | |
itemBuilder: (context, index) { | |
var person = _data[index]; | |
return ListTile( | |
title: Text("${person["fname"]} ${person["lname"]}") | |
); | |
} | |
), | |
), | |
floatingActionButton: FloatingActionButton( | |
onPressed: loadData, | |
child: Icon(Icons.refresh), | |
), | |
); | |
} | |
} |
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