Capture Screenshot xamarin android

CaptureScreen.cs

/// <summary>
/// Capture Screenshot xamarin android
/// </summary>
/// <returns> Byte[]</returns>
public async Task<byte[]> CaptureScreenAsync()
        {
            var activity = Forms.Context as Advantage.Swap.Droid.MainActivity;
            if (activity == null)
            {
                return null;
            }
            var view = activity.Window.DecorView;
            view.DrawingCacheEnabled = true;
            Android.Graphics.Bitmap bitmap = view.GetDrawingCache(false);
            byte[] bitmapData = null;
            using (var stream = new MemoryStream())
            {
                bitmap.Compress(Android.Graphics.Bitmap.CompressFormat.Png, 0, stream);
                bitmapData = stream.ToArray();
            }
          
            return bitmapData;
        }