title: Android, storage custom ArrayList
body: <p>I've read many topic on stackoverflow,and google, about this argument but i can't orient myself with writing custom ArrayList into files ! 
  I've an ArrayList of type "CustomType". "CustomType" have two String variable : "name" and "description".</p>
  
  <p>I want to save this ArrayList for reading it after closing and reopening my app. 
  Does anyone help me doing this? and does anyone explain me what happen when i save/read? </p>