How to get access token from GoogleCredential?

Question

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:

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Answer 1

If you use ServiceAccountCredentials.fromStream() to create your credential object, you may have to call the createScoped() method too.

    FileInputStream fileInputStream = new FileInputStream(KEY_FILE_PATH);
    GoogleCredentials credentials = ServiceAccountCredentials.fromStream(fileInputStream);
    credentials = credentials.createScoped(SCOPES);
    AccessToken accessToken = credentials.refreshAccessToken();

Otherwise you get the error

java.io.IOException: Scopes not configured for service account. Scoped should be specified by calling createScoped or passing scopes to constructor.

Answer 2

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();