How can i use controllers in radio group in flutter? - flutter

Question

I am trying to get user input data with different types such as text data and radio button grouped data.
In text type inputs, i use TextEditingControllers, for example ;
final quantNumberController = TextEditingController();
String quant = quantNumberController.text;
var data = {'quant': quant, 'capp': capp}
...
Container(
width: 280,
padding: EdgeInsets.all(10.0),
child: TextField(
controller: quantNumberController,
autocorrect: true,
decoration: InputDecoration(hintText: 'Enter location'),
)
),
And i want to receive radio button data like below, but is there any way to use controllers within ListTiles or how can i get user choice to my json data ;
Container(
margin: EdgeInsets.fromLTRB(0, 0, 0, 10),
child: Column(
children: <Widget>[
Text('Location'),
ListTile(
title: const Text('First value'),
leading: Radio(
value: Cap.Cap33,
groupValue: _capp,
onChanged: (Capp value) {
setState(() {
_capp = value;
capp = 'Cap33';
});
},
),
),
ListTile(
title: const Text('Second value'),
leading: Radio(
value: Capp.Cap22,
groupValue: _capp,
onChanged: (Capp value) {
setState(() {
_capp = value;
capp = 'Cap22';
});
},
),
),
ListTile(
title: const Text('Third value'),
leading: Radio(
value: Capp.Cap44,
groupValue: _capp,
onChanged: (Capp value) {
setState(() {
_capp = value;
capp = 'Cap44';
});
},
),
),
],
) ,
),

Answer 1

In your example, the user choice is saved in _capp.
Let's make a new one:
int every_many_days;
RadioListTile<int>(
title: Text('Every Day'),
value: 1,
groupValue: every_many_days,
onChanged: (int value){
setState(() {every_many_days = value;});
},
),
RadioListTile<int>(
title: Text('Every Week'),
value: 7,
groupValue: every_many_days,
onChanged: (int value){
setState(() {every_many_days = value;});
},
),
Now the choice is available in the variable every_many_days, it will be 1 or 7, and you don't need a controller.