How can I do a camera timer on xamarin android

See more:

Android

Hello how can I do a camera timer with android xamarin?
I don't know how to put a instant timer camera.

What I have tried:

var file = await CrossMedia.Current.TakePhotoAsync(new Plugin.Media.Abstractions.StoreCameraMediaOptions
{
DefaultCamera = Plugin.Media.Abstractions.CameraDevice.Front,
PhotoSize = Plugin.Media.Abstractions.PhotoSize.Small
});

if (file == null) return;

byte[] imageAsBytes = null;
using (var memoryStream = new MemoryStream())
{
file.GetStream().CopyTo(memoryStream);
file.Dispose();
imageAsBytes = memoryStream.ToArray();
}