如何从GoogleCredential获得访问令牌？ [英] How to get access token from GoogleCredential?

问题描述

我想获得一个访问令牌使用谷歌Play Android开发者的API，我走到这一步使用的谷歌的API Java客户端文档例如的：

I am trying to get an access token to use the Google Play Android Developer API, and I got this far using the Google API Java Client documentation example:

HttpTransport HTTP_TRANSPORT = new NetHttpTransport();
JsonFactory JSON_FACTORY = new JacksonFactory();

GoogleCredential credential = new GoogleCredential.Builder()
    .setTransport(HTTP_TRANSPORT)
    .setJsonFactory(JSON_FACTORY)
    .setServiceAccountId("...gserviceaccount.com")
    .setServiceAccountScopes("https://www.googleapis.com/auth/androidpublisher")
    .setServiceAccountPrivateKeyFromP12File(keyFile)
    .build();

但我怎么从这个凭据访问令牌？ credential.getAccessToken（）收益空。我做得不对，还是缺少一些步骤？

But how do I get the access token from this credential? credential.getAccessToken() returns null. Am I doing something wrong, or missing some steps?

推荐答案

明白了。你必须调用credential.getAccessToken之前credential.refreshToken（）（）。这并不是说该文档在这个地方，但那是什么做的。

Got it. You have to call credential.refreshToken() before credential.getAccessToken(). It doesn't say this anywhere in the documentation but that's what does it.

credential.refreshToken();
accessToken = credential.getAccessToken();

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