flutter provider tutorial simple language
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:provider_pattern_explained/counter.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MultiProvider(
providers: [
ChangeNotifierProvider.value(
value: Counter(),
),
],
child: MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: MyHomePage(title: "AndroidVille Provider Pattern"),
),
);
}
}
class MyHomePage extends StatelessWidget {
final String title;
MyHomePage({this.title});
void _incrementCounter(BuildContext context) {
Provider.of<Counter>(context, listen: false).incrementCounter();
}
@override
Widget build(BuildContext context) {
var counter = Provider.of<Counter>(context).getCounter;
return Scaffold(
appBar: AppBar(
title: Text(title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'You have pushed the button this many times:',
),
Text(
'$counter',
style: Theme.of(context).textTheme.headline4,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: () => _incrementCounter(context),
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}