title: Write file in sub-directory in Android
body: <p>I'm trying to save a file in a subdirectory in Android 1.5.
  I can successfully create a directory using</p>
  
  <pre><code>_context.GetFileStreamPath("foo").mkdir();
  </code></pre>
  
  <p>(_context is the Activity where I start the execution of saving the file) but then if I try to create a file in foo/ by</p>
  
  <pre><code>_context.GetFileStreamPath("foo/bar.txt");
  </code></pre>
  
  <p>I get a exception saying I can't have directory separator in a file name ("/").</p>
  
  <p>I'm missing something of working with files in Android... I thought I could use the standard Java classes but they don't seem to work...
  I searched the Android documentation but I couldn't fine example and google is not helping me too...</p>
  
  <p>I'm asking the wrong question (to google)...</p>
  
  <p>Can you help me out with this?</p>
  
  <p>Thank you!</p>