Created
July 29, 2022 07:13
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flutter refresh data source
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import 'package:flutter/material.dart'; | |
void main() => runApp(const MyApp()); | |
class MyApp extends StatelessWidget { | |
const MyApp({Key? key}) : super(key: key); | |
static const String _title = 'Flutter Code Sample'; | |
@override | |
Widget build(BuildContext context) { | |
return const MaterialApp( | |
title: _title, | |
home: MyStatefulWidget(), | |
); | |
} | |
} | |
class MyStatefulWidget extends StatefulWidget { | |
const MyStatefulWidget({Key? key}) : super(key: key); | |
@override | |
State<MyStatefulWidget> createState() => _MyStatefulWidgetState(); | |
} | |
class _MyStatefulWidgetState extends State<MyStatefulWidget> { | |
final Future<String> _calculation = Future<String>.delayed( | |
const Duration(seconds: 3), | |
() => 'Data Loaded', | |
); | |
onPressed() { | |
print('onPressed'); | |
setState(() {}); | |
} | |
@override | |
Widget build(BuildContext context) { | |
return DefaultTextStyle( | |
style: Theme.of(context).textTheme.headline2!, | |
textAlign: TextAlign.center, | |
child: FutureBuilder<String>( | |
future: _calculation, // a previously-obtained Future<String> or null | |
builder: (BuildContext context, AsyncSnapshot<String> snapshot) { | |
List<Widget> children; | |
if (snapshot.hasData) { | |
children = <Widget>[ | |
const Icon( | |
Icons.check_circle_outline, | |
color: Colors.green, | |
size: 60, | |
), | |
Padding( | |
padding: const EdgeInsets.only(top: 16), | |
child: Text('Result: ${snapshot.data}'), | |
) | |
]; | |
} else if (snapshot.hasError) { | |
children = <Widget>[ | |
const Icon( | |
Icons.error_outline, | |
color: Colors.red, | |
size: 60, | |
), | |
Padding( | |
padding: const EdgeInsets.only(top: 16), | |
child: Text('Error: ${snapshot.error}'), | |
) | |
]; | |
} else { | |
children = const <Widget>[ | |
SizedBox( | |
width: 60, | |
height: 60, | |
child: CircularProgressIndicator(), | |
), | |
Padding( | |
padding: EdgeInsets.only(top: 16), | |
child: Text('Awaiting result...'), | |
), | |
]; | |
} | |
// children.add( | |
// ElevatedButton(child: const Text('refresh'), onPressed: onPressed)); | |
return Center( | |
child: Column( | |
mainAxisAlignment: MainAxisAlignment.center, | |
children: children, | |
), | |
); | |
}, | |
), | |
); | |
} | |
} |
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