title: Android: Is it possible to easily get know that the view instance is actually visible on the screen?
body: <p>Is it possible to easily get know that the view is actually visible on the screen. I mean the case when the view is a child of scrollview. Is there an easy way to get know when the view is scrolled out of the screen or scrolled into the visible screen area?
  (or maybe there is other pattern for handling situation of "lazy initialisation" of views? - the listview rather wouldn't match while scrollview's children are variable types)
  thanks in advance.</p>