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我正在尝试在我的 Android 应用程序中为谷歌服务实现 Oauth2。我需要获取用户的电子邮件地址。目前我可以获取访问令牌和令牌秘密,但是当我尝试使用它们从联系服务获取用户的电子邮件地址时,我收到以下错误:

Caused by: java.lang.NullPointerException
    at com.google.gdata.client.authn.oauth.OAuthUtil.normalizeParameters(OAuthUtil.java:163)
    at com.google.gdata.client.authn.oauth.OAuthUtil.getSignatureBaseString(OAuthUtil.java:81)
    at com.google.gdata.client.authn.oauth.TwoLeggedOAuthHelper.addCommonRequestParameters(TwoLeggedOAuthHelper.java:79)
    at com.google.gdata.client.authn.oauth.TwoLeggedOAuthHelper.addParametersAndRetrieveHeader(TwoLeggedOAuthHelper.java:121)
    at com.google.gdata.client.authn.oauth.TwoLeggedOAuthHelper.getAuthorizationHeader(TwoLeggedOAuthHelper.java:112)
    at com.google.gdata.client.GoogleAuthTokenFactory$OAuthToken.getAuthorizationHeader(GoogleAuthTokenFactory.java:204)
    at com.google.gdata.client.http.HttpGDataRequest.<init>(HttpGDataRequest.java:331)
    at com.google.gdata.client.http.GoogleGDataRequest.<init>(GoogleGDataRequest.java:456)
    at com.google.gdata.client.http.GoogleGDataRequest$Factory.createRequest(GoogleGDataRequest.java:93)
    at com.google.gdata.client.http.HttpGDataRequest$Factory.getRequest(HttpGDataRequest.java:165)
    at com.google.gdata.client.Service.createRequest(Service.java:760)
    at com.google.gdata.client.GoogleService.createRequest(GoogleService.java:525)
    at com.google.gdata.client.Service.createFeedRequest(Service.java:1156)
    at com.google.gdata.client.Service.getFeed(Service.java:997)
    at com.google.gdata.client.GoogleService.getFeed(GoogleService.java:631)
    at com.google.gdata.client.Service.getFeed(Service.java:1017)
    at com.example.GmailOauthActivity$GmailEmailAddressTask.doInBackground(GmailOauthActivity.java:239)
    at com.example.GmailOauthActivity$GmailEmailAddressTask.doInBackground(GmailOauthActivity.java:220)
    at android.os.AsyncTask$2.call(AsyncTask.java:287)
    at java.util.concurrent.FutureTask.run(FutureTask.java:234)
    ... 4 more

这是我获取电子邮件地址的代码。如果有更简单的方法,那就太好了。谢谢 :)。

GoogleOAuthParameters oauthParameters = new GoogleOAuthParameters();
            oauthParameters.setOAuthConsumerKey(CONSUMER_KEY);
            oauthParameters.setOAuthConsumerSecret(consumer.getTokenSecret());
            oauthParameters.setScope(SCOPE);
            oauthParameters.setOAuthVerifier(verifier);
            oauthParameters.setOAuthToken(consumer.getToken());
            oauthParameters.setOAuthTokenSecret(consumer.getTokenSecret());
            ContactsService client=new ContactsService ("Service");
            client.setOAuthCredentials(oauthParameters, new OAuthHmacSha1Signer());
            oauthParameters.setOAuthType(OAuthParameters.OAuthType.TWO_LEGGED_OAUTH);
            client.setHeader("Authorization", "Bearer " + consumer.getToken());
            URL feedUrl = new URL("https://www.google.com/m8/feeds/contacts/default/full");
            com.google.gdata.client.Query myQuery = new com.google.gdata.client.Query(feedUrl);
            myQuery.setStartIndex(1);
            myQuery.setMaxResults(1);
            ContactFeed resultFeed = client.getFeed(feedUrl, ContactFeed.class);
            return resultFeed.getAuthors().get(0).getEmail();
4

2 回答 2

1

我相信我遇到的问题是忘记在我对 ContactService 的 GET 查询中包含某些项目,如“nonce”和“timestamp”。我在http://androidwarzone.blogspot.com/2011/07/android-oauth-full-example-with-source.html在线找到了一个可行的解决方案。希望这可以帮助将来的人。

于 2013-07-02T01:56:47.330 回答
0

在使用oauthParameters... 的任何属性之前,请检查if条件是否为null

特别是在此声明之前:

client.setOAuthCredentials(oauthParameters, new OAuthHmacSha1Signer());

并检查是否client为此null

ContactFeed resultFeed = client.getFeed(feedUrl, ContactFeed.class);
于 2013-07-01T04:31:29.640 回答