http post setEntity使用robospice SpringAndroid

Question

我最近从robospice迁移到SpringAndroidSpice网络库，我想用SpringAndroidSpice替换这个httpost集实体。我怎么能这样做。

        JSONObject jsonObject = new JSONObject();
        jsonObject.put("childId", childId);

        HttpPost httpPost = new HttpPost(url);
        StringEntity entity = new StringEntity(jsonObject.toString());
        httpPost.setEntity(entity);