title: How can I check if a View is visible (android listview)
body: <p>I've created a library that allows user to download images in background and put it in a View,  passed by argument to a function, when download is finished. The problem is that if I use my library in a listview, calling this method in the getView() method, when a user scroll very fast, the library do a request for each row passed. But I'd like to do it, only when a cell is really visible by user... maybe when the scroll list is stopped. So, how can I check this thing on the single view that I pass to the library method? 
  Thaaanks</p>