title: shared preferences (putStringSet) or other?
body: <p>I build a simple program (an array string with the 10 commandment), later I create another class (index to choose other activities).</p>
  
  <p>I'd like save by saved preferences this array, so the user when re-start application can continue from last point.</p>
  
  <p>I read that putStringSet is available only from api 11 while I'd keep compatibily also version 2.3</p>
  
  <p>Is there a way to save an array string?</p>
  
  <p>thanks!</p>