title: Android 4.4 files list issue
body: <p>I tried to get files in <code>/sdcard/</code> folder, but it throws <code>NullPointerException</code></p>
  <p>Then I tried to get folders in <code>/</code> path it returns</p>
  <pre><code>40
  factory
  usbdisk
  sdcard
  storage
  config
  cache
  acct
  vendor
  d
  etc
  mnt
  ueventd.tuna.rc
  ueventd.rc
  ueventd.goldfish.rc
  system
  sys
  sepolicy
  seapp_contexts
  sbin
  res
  ... and others
  </code></pre>
  <p>When I do this in 4.3 project it works well!</p>
  <p><strong>UPDATE</strong></p>
  <p>code in 4.4 which not work</p>
  <pre><code>File file = Environment.getExternalStorageDirectory();
  File[] files = file.listFiles();
  Debugger.info(files.length); // NullPointerExcepton
  for(File f : files){
      Debugger.info(f.getName());
  }
  </code></pre>