title: How to listen for imageview is on screen?
body: <p>I have a long list of icons (about 30) in my layout, so I am getting an OutOfMemory error in Android 2.3.3.</p>
  
  <p>What I want to do is creating Drawable object if only necessary (icon is visible on the current scroll).</p>
  
  <p>But how to now if imageview is on the screen or not? I couldn't find a listener for this.</p>
  
  <p>My icons (png files) are already in drawables folder. There is no downloading process at all.</p>