Retrieve the value of the radiolisttile in another page - flutter

Question

I have a settings page where I have radiolisttile which are kept with shared preferences which shows me a list of files which is stored in google drive.
the list returns the name and id of each file.
In another page I have a button which must show me the file according to the value of the radio.
so i want to retrieve the value which should be the id for the button link.
Thank you for your help
Future<void> _listGoogleDriveMeubles() async {
var client = GoogleHttpClient(await googleSignInAccount!.authHeaders);
var drive = ga.DriveApi(client);
drive.files
.list(pageSize: 20, q: "'MASQUED' in parents")
.then((value) {
setState(() {
meubles = value;
});
for (var i = 0; i < meubles!.files!.length; i++) {
idDevisMeubles = meubles!.files![i].id;
print(
"Id: ${meubles!.files![i].id} File Name:${meubles!.files![i].name}");
}
});
}
List<Widget> generateFilesMeuble() {
List<Widget> listItem = <Widget>[];
if (meubles != null) {
for (var i = 0; i < meubles!.files!.length; i++) {
listItem.add(Row(
children: <Widget>[
Expanded(
child: RadioListTile(
title: Text(meubles!.files![i].name ?? ''),
value: meubles!.files![i].id ?? '',
groupValue: selectedDevisMeuble,
onChanged: (String? newValue) => setState(() {
selectedDevisMeuble = newValue;
})),
),
// child: Text(meubles!.files![i].name ?? ''),
],
));
}
}
return listItem;
}
In another page I have a button which must show me the file according to the value of the radio.
so i want to retrieve the value which should be the id for the button link.
Thank you for your help
Container(
width: 160,
height: 160,
decoration: const BoxDecoration(
image: DecorationImage(
image: AssetImage('assets/cuisinella_cleanup.png'),
fit: BoxFit.cover,
)),
child: TextButton(
style: ButtonStyle(
shape: MaterialStateProperty.all(
RoundedRectangleBorder(
borderRadius: BorderRadius.circular(100)),
),
),
onPressed: () async {
if (isLoading) return;
setState(() => isLoading = true);
await Future.delayed(const Duration(seconds: 5));
const url =
'https://drive.google.com/uc?export=view&id=ID FILE FROM RADIOLISTTILE';
final file = await PDFApi.loadNetwork(url);
openPDF(context, file);
setState(() => isLoading = false);
},
child: isLoading
? const CircularProgressIndicator(
color: Colors.white,
)
: const Text(
'devis meuble',
style: TextStyle(
fontSize: 25, color: Colors.white),
textAlign: TextAlign.center,
),
),
),