How To Create Custom Radio Button In Flutter Android

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
          appBar: AppBar(
            centerTitle: true,
            backgroundColor: Colors.lightGreen,
            title: Text("Custom Radio Button"),
          ),
          body: SafeArea(
              child : Center(

                child:Radiobutton(),

              )
          )
      ),
    );
  }
}

class Radiobutton extends StatefulWidget {
  @override
  RadioButtonWidget createState() => RadioButtonWidget();
}

class RadioButtonWidget extends State {

  String radioItem = '';

  Widget build(BuildContext context) {
    return Column(
      children: <Widget>[

        RadioListTile(
          controlAffinity: ListTileControlAffinity.trailing,
          groupValue: radioItem,
          title: Text('Item 1'),
          value: 'Item 1',
          onChanged: (val) {
            setState(() {
              radioItem = val;
            });
          },
        ),

        RadioListTile(
          controlAffinity: ListTileControlAffinity.trailing,
          groupValue: radioItem,
          title: Text('Item 2'),
          value: 'Item 2',
          onChanged: (val) {
            setState(() {
              radioItem = val;
            });
          },
        ),
        RadioListTile(
          controlAffinity: ListTileControlAffinity.trailing,
          groupValue: radioItem,
          title: Text('Item 3'),
          value: 'Item 3',
          onChanged: (val) {
            setState(() {
              radioItem = val;
            });
          },
        ),

        Text('$radioItem', style: TextStyle(fontSize: 23),)

      ],
    );
  }
}