title: Android SharedPreferences with MODE_PRIVATE,MODE_WORLD_READABLE,MODE_WORLD_WRITABLE
body: <p><code>SharedPreferences</code> in Android are local to an Application, and not shared between different applications. When I say</p>
  
  <pre><code>SharedPreferences preferences = getSharedPreferences(PREF_NAME, MODE_WORLD_READABLE);
  </code></pre>
  
  <p>What does it signify to make this preferences <code>MODE_WORLD_READABLE</code>, <code>MODE_WORLD_WRITABLE</code> or 
  <code>MODE_PRIVATE</code>?</p>