@Override
  public void addCollection(String remotePath, String displayName) {
    account.setCardDavCollection(context, remotePath);

    LocalContactCollection collection =
        new LocalContactCollection(context, client, account.getOsAccount(), remotePath);
    collection.setDisplayName(displayName);
  }
 @Override
 public void addCollection(String remotePath) {
   account.setCardDavCollection(context, remotePath);
 }
 @Override
 public void removeCollection(String remotePath) {
   account.setCardDavCollection(context, null);
 }