How can I only check one checkbox at time? - flutter

Question

How can I select/check only one checkbox to be checked at time?
And below is my code
Container(
child: Row(
mainAxisAlignment: MainAxisAlignment.end,
children: [
Checkbox(
checkColor: Colors.white,
value: isChecked,
onChanged: (bool value) {
setState(() {
isChecked = value;
// ignore: unnecessary_statements
passData(certId);
});
},
),
],
)),

Answer 1

Option1 - Using a map to maintain the state
Create a map:
final Map<int, bool> _state = {};
then, check if the value for that index is true/false:
return ListView.builder(itemBuilder: (context, index) {
return CheckboxListTile(
value: _state[index] ?? false,
onChanged: (value) {
setState(() {
_state[index] = value!;
});
},
title: Text(_data[index].text),
);
});
Option 2 - using a model:
class CheckBoxModel {
bool isChecked = false;
String text = "";
CheckBoxModel({required this.isChecked, required this.text});
}
and then, generate a List of 30 widgets:
final _data = List.generate(
30, (index) => CheckBoxModel(isChecked: false, text: "Item $index"));
Now, use a ListView.builder and based on the index, to update the corresponding value:
class Testing extends StatefulWidget {
const Testing({Key? key}) : super(key: key);
#override
State<Testing> createState() => _TestingState();
}
class _TestingState extends State<Testing> {
#override
Widget build(BuildContext context) {
return ListView.builder(itemBuilder: (context, index) {
return CheckboxListTile(
value: _data[index].isChecked,
onChanged: (value) {
setState(() {
_data[index].isChecked = value!;
});
},
title: Text(_data[index].text),
);
});
}
}
See also
Expansion tile trailing icon updates all in list on interaction with one tile. How can I only change the icon for the expanded tile?