Device calendar accounts is not display in flutter - flutter

Question

Calendars from my device and local accounts are not displayed on my screen The calendar is correctly presented when I execute my code using USB, however when I generate an apk and then install it on my device, the calendar is not visible.i am using device calendar plugin i get this code from there account Can anyone assist in identifying the problem?
class CalendarsPage extends StatefulWidget {
const CalendarsPage(
{Key? key,
required String calendarName,
required void Function() opendrawer,
required double animationtime})
: super(key: key);
#override
_CalendarsPageState createState() {
return _DoctorCalendarsPageState();
}
}
class _CalendarsPageState extends State<CalendarsPage> {
late CalendarPlugin _CalendarPlugin;
List<Calendar> _calendar = [];
List<Calendar> get _writableCalendars =>
_calendar.where((c) => c.isReadOnly == false).toList();
List<Calendar> get _readOnlyCalendars =>
_calendar.where((c) => c.isReadOnly == true).toList();
_CalendarsPageState() {
_deviceCalendarPlugin = DeviceCalendarPlugin();
}
#override
void initState() {
super.initState();
_retrieveCalendars();
_CalendarsPageState();
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: Column(
children: [
Expanded(
flex: 1,
child: ListView.builder(
itemCount: _calendar.length,
itemBuilder: (BuildContext context, int index) {
return GestureDetector(
key: Key(_calendar[index].isReadOnly == true
? 'readOnlyCalendar${_readOnlyCalendars.indexWhere((c) => c.id == _calendar[index].id)}'
: 'writableCalendar${_writableCalendars.indexWhere((c) => c.id == _calendar[index].id)}'),
onTap: () async {
await Navigator.push(context,
MaterialPageRoute(builder: (BuildContext context) {
return DoctorEventsPage(_calendar[index],
key: const Key('calendarEventsPage'));
}));
},
child: Padding(
padding: const EdgeInsets.all(10.0),
child: Container(
height: 22,
child: Row(
children: [
Expanded(
flex: 1,
child: Text(
_calendar[index].name!,
style: Theme.of(context).textTheme.subtitle1,
),
),
Container(
width: 15,
height: 15,
decoration: BoxDecoration(
shape: BoxShape.circle,
color: Color(_calendar[index].color!)),
),
const SizedBox(width: 10),
// Container(
// margin: const EdgeInsets.fromLTRB(0, 0, 5.0, 0),
// padding: const EdgeInsets.all(3.0),
// decoration: BoxDecoration(
// border: Border.all(color: Colors.blueAccent)),
// // child: const Text('Default'),
// ),
Icon(_calendar[index].isReadOnly == true
? Icons.lock
: Icons.lock_open)
],
),
),
),
);
},
),
),
],
),
floatingActionButton: FloatingActionButton(
onPressed: () async {
final createCalendar = await Navigator.push(context,
MaterialPageRoute(builder: (BuildContext context) {
return DoctorCalendarAddPage();
}));
if (createCalendar == true) {
_retrieveCalendars();
}
},
child: const Icon(Icons.add),
backgroundColor: Colors.green,
),
);
}
void _retrieveCalendars() async {
try {
var permissionsGranted = await _deviceCalendarPlugin.hasPermissions();
if (permissionsGranted.isSuccess &&
(permissionsGranted.data == null ||
permissionsGranted.data == false)) {
permissionsGranted = await _deviceCalendarPlugin.requestPermissions();
if (!permissionsGranted.isSuccess ||
permissionsGranted.data == null ||
permissionsGranted.data == false) {
return;
}
}
final calendarsResult = await _deviceCalendarPlugin.retrieveCalendars();
setState(() {
_calendar = calendarsResult.data as List<Calendar>;
});
} on PlatformException catch (e) {
if (kDebugMode) {
print(e);
}
}
}
}