title: Creating directory in application package on internal storage
body: <p>Is it possible for android application to create several directories in internal storage for storing there different kinds of files? I need this capability, because I'll need to delete a kind of files at definite time moment in my application.</p>
  
  <p>When I try to use standard <code>Context</code> method <code>openFileOutput()</code> and send to it filename with "/" symbol I get <code>IllegalArgumentException</code>. </p>
  
  <p>Tell me please what classes and methods could allow me such functionality?</p>