Scheduled notification not working in Xamarin android 9.0

Hi,

Whenever I am using Alarm Manager in my Local Notification code,it is working fine with Android version 8.0 and below. But ,

its not working for Android version 9.0.

Alarm Manager Code ::

var intent = CreateIntent(id);

var localNotification = new LocalNotification();

localNotification.Title = title;

localNotification.Body = body;

localNotification.Id = id;

localNotification.NotifyTime = notifyTime;

if (_notificationIconId != 0)

{

localNotification.IconId = _notificationIconId;

}

else

{

localNotification.IconId = Resource.Drawable.notification_bg;

}

var serializedNotification = SerializeNotification(localNotification);

intent.PutExtra(ScheduledAlarmHandler.LocalNotificationKey, serializedNotification);

Random generator = new Random();

_randomNumber = generator.Next(100000, 999999).ToString("D6");

var pendingIntent = PendingIntent.GetBroadcast(Application.Context, Convert.ToInt32(_randomNumber), intent, PendingIntentFlags.Immutable);

var alarmManager = GetAlarmManager();

alarmManager.Set(AlarmType.RtcWakeup, totalMilliSeconds, pendingIntent);

And, when I am implementing the same code with Notification Manager using ChannelID . So, the notification is popping up in

Android Version 9.0 and below.

But, if I want to set a particular delivery time to show up the Notification, then it doesn't work here. It delivers immediately.

Notification Manager Code ::

PendingIntent pendingIntent = PendingIntent.GetActivity(Application.Context, pendingIntentId, intent, PendingIntentFlags.Immutable);

NotificationCompat.Builder builder = new NotificationCompat.Builder(Application.Context, channelId)

.SetVibrate(new long[] { 0, 100 })

.SetPriority(1)

.SetContentIntent(pendingIntent)

.SetContentTitle(title)

.SetContentText(body)

.SetWhen(totalMilliSeconds)

.SetSmallIcon(Resource.Drawable.notification_bg)

.SetDefaults((int)NotificationDefaults.Sound | (int)NotificationDefaults.Vibrate);

Notification notification = builder.Build();

manager.Notify(channelId, messageId, notification);

So, is there a way so that I can implement this in Android Version 9.0 and below???