How to use

addContact

method

in

co.chatsdk.core.base.BaseContactHandler

@Override
public Completable addContacts(ArrayList<User> users, ConnectionType type) {
  ArrayList<Completable> completables = new ArrayList<>();
  for (User user : users) {
    completables.add(addContact(user, type));
  }
  return Completable.concat(completables);
}