我正在尝试在我的Android应用中为Google服务实现Oauth2。我需要获取用户的电子邮件地址。当前，我可以获取访问令牌和令牌密钥，但是当我尝试使用这些令牌和令牌密钥从contactservice获取用户的电子邮件地址时，出现以下错误：
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。如果有一个更简单的方法，那也将很棒。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();
最佳答案
我认为我遇到的问题是忘记在对ContactService的GET查询中包括“ nonce”和“ timestamp”之类的某些项目。我在http://androidwarzone.blogspot.com/2011/07/android-oauth-full-example-with-source.html网上找到了可行的解决方案。希望这可以在将来对某人有所帮助。