Flutter
  • Flutter Tutorials Handbook
  • 01 Flutter: Hello World
    • Related Article
  • 02 Flutter: Stateless Widgets
  • 03 Flutter: Buttons and Stateful widgets
  • 04 Flutter: Basic Navigation & Routes
    • Simple routes using StatelessWidget
    • Routes using StatefulWidget
  • 05 Flutter: Using onChanged to show input text
  • 06 Flutter: Using onSubmitted to show input text after submit
  • 07 Flutter: Adding-Deleting text in TextField
  • 08 Flutter: Tab Navigation
  • 09 Flutter: HTTP requests and Rest API
  • 10 Flutter: ListView with JSON or List Data
  • 11 Flutter: Sliding menu using a Drawer
    • Simple Drawer
    • Drawer using variables
  • 12 Flutter: Animations
  • 13 Flutter: JSON Storage
  • 14 Flutter: Friendly Chat App
  • 15 Flutter: Changing icon color onfocus
  • 16 Flutter: Horizontal ListView and Tabs
  • 17 Flutter: RaisedButton
  • 18 Flutter: RaisedButton with parameters
  • 19 Flutter: FlatButton
  • 20 Flutter: IconButton
  • 21 Flutter: Updating data in TextField
  • 22 Flutter: Checkbox
  • 23 Flutter: Radio with Functions
  • 24 Flutter: Switch
  • 25 Flutter: Slider
  • 26 Flutter: DatePicker
  • 27 Flutter: appBar
  • 28 Flutter: Floating Action Button
  • 29 Flutter: Drawer which shows Toggle Menu
  • 30 Flutter: Footer Buttons
  • 31 Flutter: BottomNavigationBar
  • 32 Flutter: Using BottomSheets
  • 33 Flutter: Using SnackBar
  • 34 Flutter: AlertDialog
  • 35 Flutter: SimpleDialog
  • 36 Flutter: Rows and Columns
  • 37 Flutter: Using Cards
  • 38 Flutter: Using Expanded
  • 39 Flutter: ListviewBuilder using Dart maps
  • 40 Flutter: ListviewBuilder using Dart lists
  • 41 Flutter: Using Custom Widgets
  • 42 Flutter: Using Image Assets
  • 43 Flutter: ListviewBuilder with Refresh Indicator
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03 Flutter: Buttons and Stateful widgets

main.dart
import 'package:flutter/material.dart';

void main() {
  runApp(new MaterialApp(
    home: new AwesomeButton()
  ));
}

class AwesomeButton extends StatefulWidget {
  @override
  AwesomeButtonState createState() => new AwesomeButtonState();
}

class AwesomeButtonState extends State<AwesomeButton> {

  int counter = 0;
  List<String> strings = ["Flutter", "Is", "Awesome"];
  String displayedString = "";

  //you can also declare variables like this
  // var counter = 0;
  // var strings = ["Flutter", "Is", "Awesome"];

  void onPressed(){
    setState(() {
      displayedString = strings[counter];
      counter = counter < 2 ? counter+1 : 0;
    });
  }

  @override
  Widget build(BuildContext context){
    return new Scaffold(
      appBar: new AppBar(title: new Text("Stateful Widget!"), backgroundColor: Colors.deepOrange),
      body: new Container(
        child: new Center(
          child: new Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              new Text(displayedString, style: new TextStyle(fontSize: 30.0, fontWeight: FontWeight.bold)),
              new Padding(padding: new EdgeInsets.all(15.0)),
              new RaisedButton(
                child: new Text("Press me!", style: new TextStyle(color: Colors.white, fontStyle: FontStyle.italic, fontSize: 20.0)),
                color: Colors.red,
                onPressed: onPressed
              )
            ]
          )
        )
      )
    );
  }
}
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Last updated 6 years ago