code: public void onOperationCompleted(String clientId, String conversationId, int requestId,
                                     Conversation.AVIMOperation operation, Throwable throwable) {
      if (AVIMOperation.CONVERSATION_QUERY == operation) {
        AVCallback callback = RequestCache.getInstance().getRequestCallback(clientId, null, requestId);
        if (null != callback) {
          // internal query conversation.
          callback.internalDone(null, AVIMException.wrapperAVException(throwable));
          RequestCache.getInstance().cleanRequestCallback(clientId, null, requestId);
          return;
        }
      }
      IntentUtil.sendIMLocalBroadcast(clientId, conversationId, requestId, throwable, operation);
    }
docs: response notifier