Register a drag event listener callback object for this View. The parameter is an implementation of NoType:android/view/View$OnDragListener;Href=../../../reference/android/view/View.OnDragListener.html. To send a drag event to a View, the system calls the NoType:android/view/View$OnDragListener;Href=../../../reference/android/view/View.OnDragListener.html#onDrag(android.view.View, android.view.DragEvent) method.