23 Flutter: Radio with Functions

main.dart

import 'package:flutter/material.dart';

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

class MyApp extends StatefulWidget {
  @override
  _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>{

 int _value1 = 0;
 int _value2 = 0;

 void _setvalue1(int value) => setState(() => _value1 = value);
 void _setvalue2(int value) => setState(() => _value2 = value);

 Widget makeRadios() {
   List<Widget> list = new List<Widget>();

   for(int i=0; i<3; i++){
     list.add(new Radio(value: i, groupValue: _value1, onChanged: _setvalue1));
   }

   Column column = new Column(
     children: list,
   );

   return column;
 }

 Widget makeRadioTiles() {
   List<Widget> list = new List<Widget>();

   for(int i = 0; i < 3; i++){
     list.add(new RadioListTile(
       value: i,
       groupValue: _value2,
       onChanged: _setvalue2,
       activeColor: Colors.green,
       controlAffinity: ListTileControlAffinity.trailing,
       title: new Text('Item: ${i}'),
       subtitle: new Text('sub title'),

     ));
   }

   Column column = new Column(children: list,);
   return column;
 }

  @override
  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>[
              makeRadios(),
              makeRadioTiles()
            ],
          ),
        ),
      ),
    );
  }
}