public async void StartListening(Action <Vector3Dto> listener) { headTracker = HeadTracker.CreateFromContext(Android.App.Application.Context); headTracker.StartTracking(); await Task.Delay(1000); while (true) { await Task.Delay(16); var view = new float[16]; headTracker.GetLastHeadView(view, 0); var m4 = new Matrix4( view[0], view[1], view[2], view[3], view[4], view[5], view[6], view[7], view[8], view[9], view[10], view[11], view[12], view[13], view[14], view[15]); var rot = m4.Rotation; listener(new Vector3Dto(-rot.PitchAngle - 90, rot.YawAngle, 0)); } }