void Animate(LibraryHoloCircularProgressBar.HoloCircularProgressBar progressBar, Android.Animation.Animator.IAnimatorListener listener,float progress, int duration) { _progressBarAnimator = ObjectAnimator.OfFloat(progressBar, "progress", progress); _progressBarAnimator.SetDuration(duration); progressBar1 = progressBar; progress1 = progress; _progressBarAnimator.AddListener (this); if (listener != null) { _progressBarAnimator.AddListener(listener); } _progressBarAnimator.Reverse(); _progressBarAnimator.AddUpdateListener (this); progressBar.SetMarkerProgress(progress); _progressBarAnimator.Start(); }