How call Permision request many times in flutter - flutter

Question

I want call permissionRequest for getting user photos. When I call permissionRequest and user didn't allow permission, then I show alert and when in custom alert user tap in allow button I want show permissionRequest again.
For this I try using photo_manager or permission_handler package. But in both packages when I second time call permissionRequest() function not show system permissionRequest
void _showGeneralAlert() {
Alert.show(
context,
title: 'Allow photo access',
button: AlertButton(
title: 'Allow',
onTap: () {
Navigator.pop(context);
_request();
})
);
}
Future<void> _request() async {
_permissionStatus = await Permission.photos.request();
if (_permissionStatus != PermissionStatus.granted) {
_showGeneralAlert();
}
}

Answer 1

May be because you permanently denied permission,
For this case you need to ask user to take permission default way(ask to open app settings and take
permission)
if (await Permission.photos.isPermanentlyDenied) {
// The user opted to never again see the permission request dialog for this
// app. The only way to change the permission's status now is to let the
// user manually enable it in the //systemsettings.
Print("permission permanently denied ");
openAppSettings();
}
Update
If this case not work then check your permission status,
var status = await Permission.camera.status;
print("permission status"+status.toString());
If they print restricted or permanentlyDenied. Then you need to open setting,otherwise you can ask permission