title: Environment.getExternalStorageDirectory() on the emulator
body: <p>I want to read and write images to the external storage in my app. From what I read the following is the correct way to get a handle on the directory.</p>
  
  <pre><code> File externalStorageDir = Environment.getExternalStorageDirectory();
   File picturesDir = new File(externalStorageDir, "Pictures");
  </code></pre>
  
  <p>However ...</p>
  
  <pre><code> picturesDir.exists(); // == null
   picturesDir.mkdir(); // == false
  </code></pre>
  
  <p>Is this because I'm using the emulator?</p>