title: Display images in a listView
body: <p>In my android App, I have a lot of ListView. For each item of a listView, I have a TextView, and an ImageView.</p>
  
  <p>I use Adapter for display items and AsynTask to download Image from server. When I scroll down my ListView, the images are downloaded. But when I scroll up, the images, which are already downloaded, download again. </p>
  
  <p>I want to create a sort of cache of image, do you understand my problem ?</p>
  
  <p>This is the type of my ListView : Image + TXT :</p>
  
  <p><a href="https://i.stack.imgur.com/D59IJ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/D59IJ.png" alt="enter image description here"></a><br>
  <sub>(source: <a href="http://www.androidhive.info/wp-content/uploads/2012/05/android_custom_listview_onhover.png?7885e2" rel="nofollow noreferrer">androidhive.info</a>)</sub>  </p>
  
  <p>Thanks a lot!</p>