android – Oauth 2无法交换访问令牌的代码,返回“invalid_grant”

我发现当我的重定向uri为“urn：ietf：wg：oauth：2.0：oob”时,我可以通过OAuth 2.0进行身份验证,但是用户被迫复制@L_616_2@,然后返回一个活动并将其粘贴到领域.我希望体验比这更优雅.当重定向uri是“http：// localhost”时,(即使返回了访问@L_616_2@)我也无法将其替换为api的访问令牌.这是我的交换@L_616_2@：

ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(
                    0);
            nameValuePairs.add(new BasicNameValuePair("client_id",OAuth2ClientCredentialsmark1.CLIENT_ID));
            nameValuePairs.add(new BasicNameValuePair("client_secret",OAuth2ClientCredentialsmark1.CLIENT_SECRET));
            nameValuePairs.add(new BasicNameValuePair("code",accessCodE));
            nameValuePairs.add(new BasicNameValuePair("grant_type","authorization_code"));
            nameValuePairs.add(new BasicNameValuePair("redirect_uri",OAuth2ClientCredentialsmark1.REDIRECT_URI));
                    //"http://localhost"

            String url = "https://accounts.google.com/o/oauth2/token";
            //url += URLEncodedUtils.format(nameValuePairs,"utf-8");

            Log.d("print",url);
            httpPost hPost = new httpPost(
                    url);
            hPost.setHeader("content-type","application/x-www-form-urlencoded");

            hPost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

此@L_616_2@始终返回{“Error”：“invalid_grant”}给出了什么？

我的应用程序基于样本@ https://github.com/ddewaele/LatitudeOAuth2Sample,我一直在关注教程@ http://code.google.com/apis/accounts/docs/OAuth2InstalledApp.html