@Override public void cancel() { if (utAdRequest != null) { utAdRequest.cancel(true); utAdRequest = null; } setAdList(null); if (controller != null) { controller.cancel(true); controller = null; } if (mediatedNativeAdController != null) { mediatedNativeAdController.cancel(true); mediatedNativeAdController = null; } if (ssmAdViewController != null) { ssmAdViewController = null; } if (owner != null) { owner.clear(); } }