code: public static void addComment (Activity context, Entity entity, String text, CommentAddListener listener) {
  		proxy.addComment(context, entity, text, listener);
  	}
docs: Adds a comment to the given entity.  This method will also prompt the user to share their comment.
  @param context The current context.
  @param entity The entity on which the comment will be associated.
  @param text The text of the comment.
  @param listener A listener to handle the result.