code: public void getStreamsByUsername(String username, int pageNumber, int itemsPerPage, final KickflipCallback cb) {
          if (!assertActiveUserAvailable(cb)) return;
          GenericData data = new GenericData();
          addPaginationData(pageNumber, itemsPerPage, data);
          data.put("uuid", getActiveUser().getUUID());
          data.put("username", username);
          post(SEARCH_USER, new UrlEncodedContent(data), StreamList.class, cb);
      }
docs: Get a List of {@link io.kickflip.sdk.api.json.Stream} objects created by the given Kickflip User.
  
  @param username the target Kickflip username
  @param cb       A callback to receive the resulting List of Streams