@Override
 List<BladeRef> getBlades(Intent intent) {
   List<BladeRef> blades = BladeUtil.getAvailableBlades();
   List<BladeRef> installed =
       BladeUtil.getInstalledBlades(intent.getCharSequenceExtra("packageName").toString());
   // remove already installed Blades
   blades.removeAll(installed);
   return blades;
 }