code: public void queryBlockedMembers(int offset, int limit, final AVIMConversationSimpleResultCallback callback) {
      if (null == callback) {
        return;
      } else if (offset < 0 || limit > 100) {
        callback.internalDone(null, new AVIMException(new IllegalArgumentException("offset/limit is illegal.")));
        return;
      }
      Map<String, Object> params = new HashMap<String, Object>();
      params.put(Conversation.QUERY_PARAM_LIMIT, limit);
      params.put(Conversation.QUERY_PARAM_OFFSET, offset);
      boolean ret = InternalConfiguration.getOperationTube().processMembers(this.client.getClientId(), this.conversationId,
              getType(), JSON.toJSONString(params), Conversation.AVIMOperation.CONVERSATION_BLOCKED_MEMBER_QUERY, callback);
      if (!ret) {
        callback.internalDone(null,
                new AVException(AVException.OPERATION_FORBIDDEN, "couldn't start service in background."));
      }
    }
docs: 查询黑名单的成员列表
  @param offset    查询结果的起始点
  @param limit     查询结果集上限
  @param callback  结果回调函数