25 Flutter: Slider

main.dart
import 'package:flutter/material.dart';
void main(){
runApp(new MaterialApp(
home: new MyApp(),
));
}
class MyApp extends StatefulWidget {
_State createState() => new _State();
}
//State is information of the application that can change over time or when some actions are taken.
class _State extends State<MyApp>{
double _value = 0.0;
void _setvalue(double value) => setState(() => _value = value);
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text('Name here'),
),
//hit Ctrl+space in intellij to know what are the options you can use in flutter widgets
body: new Container(
padding: new EdgeInsets.all(32.0),
child: new Center(
child: new Column(
children: <Widget>[
new Text('Value: ${(_value * 100).round()}'),
new Slider(value: _value, onChanged: _setvalue)
],
),
),
),
);
}
}