title: Access permissions during android file sharing
body: <p>Why is it sufficient to <a href="http://developer.android.com/reference/android/content/Context.html" rel="nofollow">openFileOutput()</a> a file with mode <a href="http://developer.android.com/reference/android/content/Context.html#MODE_WORLD_READABLE" rel="nofollow">MODE_WORLD_READABLE</a> (as the manual <a href="http://developer.android.com/training/sharing/send.html#send-binary-content" rel="nofollow">says</a>) to make a file readable by other apps (via a share Intent)?</p>
  
  <p>Even if the <em>file</em> is readable, doesn't the <em>directory</em> remain private (rwx------ rather than rwxrwxrwx)?</p>