code: private void sendMessage(Crouton crouton, final int messageId) {
      final Message message = obtainMessage(messageId);
      message.obj = crouton;
      sendMessage(message);
    }
docs: Sends a {@link Crouton} within a {@link Message}.
  
  @param crouton
  The {@link Crouton} that should be sent.
  @param messageId
  The {@link Message} id.