Flutter:Checkbox onChange does not update UI even tough the value changes - flutter

Question

I'm building a To App in flutter and I want to change the boolean value of my individual todo by using a checkbox. While the value does change it is not reflected in the UI. Did I do something wrong?
In the beginning, I did not use a boolean to change the value of my Todo's completed property. I tried to change it with the checkbox but It did not seem to work and that's why I put a boolean instead.
import 'package:flutter/material.dart';
import './todo.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'To do app',
theme: ThemeData(
brightness: Brightness.light,
primarySwatch: Colors.green,
),
darkTheme: ThemeData(
brightness: Brightness.light,
),
home: MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
final List _myTodos = [
Todo(title: 'Take the dogs for a walk', completed: false, id: '1'),
Todo(title: 'Go out for a run', completed: true, id: '2')
];
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('To do app'),
centerTitle: true,
),
body: _myTodos.isEmpty
? Text(
'Press the button to add a new Todo',
style: TextStyle(fontSize: 20),
)
: Column(
children: _myTodos.map((todo) {
bool completed = todo.completed;
return Row(
children: <Widget>[
Checkbox(
value: completed,
onChanged: (bool newValue) {
print(completed);
setState(() {
completed = newValue;
print(completed);
});
},
),
Text(
todo.title,
style: TextStyle(fontSize: 16),
)
],
);
}).toList()),
floatingActionButton: FloatingActionButton(
onPressed: () {},
elevation: 8,
child: Icon(Icons.add),
),
);
}
}

Answer 1

Thank you all for your answers. I found out what was my issue. In my Todo class, I have set my completed value as final so of course, I wasn't able to change it when I pressed it.