NsdManager.RegistrationListener registrationListener = new RegistrationListener() {
  @Override
  public void onServiceRegistered(NsdServiceInfo nsdServiceInfo) {
    serviceName = nsdServiceInfo.getServiceName();
  }
  
  @Override
  public void onRegistrationFailed(NsdServiceInfo nsdServiceInfo, int errorCode) {
    Log.e(Constants.TAG, "An exception occured while registering the service: " + errorCode);
  }
  
  @Override
  public void onServiceUnregistered(NsdServiceInfo nsdServiceInfo) {
  }
  
  @Override
  public void onUnregistrationFailed(NsdServiceInfo nsdServiceInfo, int errorCode) {
    Log.e(Constants.TAG, "An exception occured while unregistering the service: " + errorCode);
  }
};