@Override
 public void onResume() {
   super.onResume();
   rootdir = Environment.getExternalStorageDirectory().getAbsolutePath();
   directoryView = (TextView) findViewById(R.id.directory);
   SharedPreferences settings = getPreferences(0);
   String lastBrowsedDirectory = settings.getString("lastBrowsedDirectory", null);
   if (lastBrowsedDirectory == null) {
     lastBrowsedDirectory = rootdir;
   }
   loadDirectory(lastBrowsedDirectory);
 }