如何在Android中向HTTP GET请求添加参数？

我使用NamevaluePair和URLEnpredUtils列表创建所需的url字符串。

protected String addLocationToUrl(String url){    if(!url.endsWith("?"))        url += "?";    List<NamevaluePair> params = new linkedList<NamevaluePair>();    if (lat != 0.0 && lon != 0.0){        params.add(new BasicNamevaluePair("lat", String.valueOf(lat)));        params.add(new BasicNamevaluePair("lon", String.valueOf(lon)));    }    if (address != null && address.getPostalCode() != null)        params.add(new BasicNamevaluePair("postalCode", address.getPostalCode()));    if (address != null && address.getCountryCode() != null)        params.add(new BasicNamevaluePair("country",address.getCountryCode()));    params.add(new BasicNamevaluePair("user", agent.uniqueId));    String paramString = URLEnpredUtils.format(params, "utf-8");    url += paramString;    return url;}