title: Can Shared Preferences be private?
body: <p>From the name alone, I am guessing that <a href="http://developer.android.com/guide/topics/data/data-storage.html" rel="noreferrer">Shared Preferences</a> are... shared among apps? 
  That is, even if my app defines and creates them, any app on android can access them. Is this correct?</p>
  
  <p>(If this isn't correct, then why does the Data Storage Dev Guide emphasize <a href="http://developer.android.com/guide/topics/data/data-storage.html" rel="noreferrer">Internal Storage</a> as "Store private data"?)</p>
  
  <p>If this is correct, can I modify this default behavior so that a preference is only visible from the app in which I define and create it?</p>
  
  <p>If so, how do I do that?</p>