private static List<String> _listAllKeys() {
    List<String> res = new ArrayList<>(100);
    final Foundation.NSAutoreleasePool pool = new Foundation.NSAutoreleasePool();
    try {
      final ID defaults = Foundation.invoke("NSUserDefaults", "standardUserDefaults");
      final ID allKeysDict = Foundation.invoke(defaults, "dictionaryRepresentation");
      final ID allKeysArr = Foundation.invoke(allKeysDict, "allKeys");
      final ID count = Foundation.invoke(allKeysArr, "count");
      for (int c = 0; c < count.intValue(); ++c) {
        final ID nsKeyName = Foundation.invoke(allKeysArr, "objectAtIndex:", c);
        final String keyName = Foundation.toStringViaUTF8(nsKeyName);
        //      System.out.println(keyName);
        res.add(keyName);
      }
      return res;
    } finally {
      pool.drain();
    }
  }
private static List<String> _listAllKeys()