Hide keyboard upon tapping on radio button in Flutter - flutter

Question

I am trying to find a way to dismiss the keyboard upon tapping on the radio buttons. I found some answers like this tutorial (https://flutterigniter.com/dismiss-keyboard-form-lose-focus/) but this will only hide the keyboard upon clicking outside the text field on an empty spot not tapping the radio button.
Here is a simple code if you would like to try. Any thoughts will be highly appreciated. Thanks
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
/// This Widget is the main application widget.
class MyApp extends StatelessWidget {
static const String _title = 'Flutter Code Sample';
#override
Widget build(BuildContext context) {
return MaterialApp(
title: _title,
home: Scaffold(
appBar: AppBar(title: const Text(_title)),
body: Center(
child: MyStatefulWidget(),
),
),
);
}
}
enum SingingCharacter { lafayette, jefferson }
class MyStatefulWidget extends StatefulWidget {
MyStatefulWidget({Key key}) : super(key: key);
#override
_MyStatefulWidgetState createState() => _MyStatefulWidgetState();
}
class _MyStatefulWidgetState extends State<MyStatefulWidget> {
SingingCharacter _character = SingingCharacter.lafayette;
Widget build(BuildContext context) {
return Column(
children: <Widget>[
TextField(
autofocus: true,
),
ListTile(
title: const Text('Lafayette'),
leading: Radio(
value: SingingCharacter.lafayette,
groupValue: _character,
onChanged: (SingingCharacter value) {
setState(() {
_character = value;
});
},
),
),
ListTile(
title: const Text('Thomas Jefferson'),
leading: Radio(
value: SingingCharacter.jefferson,
groupValue: _character,
onChanged: (SingingCharacter value) {
setState(() {
_character = value;
});
},
),
),
],
);
}
}

Answer 1

in onChange Function write this line of code FocusScope.of(context).unfocus();

Answer 2

A couple of Solutions
Using SystemChannels
import 'package:flutter/services.dart';
SystemChannels.textInput.invokeMethod('TextInput.hide');
Using FocusScope
FocusScope.of(context).unfocus();

Answer 3

Add this line in onChange Function
FocusScope.of(context).requestFocus(new FocusNode());