[android-developers] how to fetch access token for google api.Authenticating with OAuth 2.0 in android

Hiii, I need to fetch the access token for google account to access google reader data in android 4.0.4. using google api java client 1.8.0 beta.
And for the sample code
https://developers.google.com/google-apps/tasks/oauth-and-tasks-on-android
it is showing the error "The method getAccountManager() is undefined for the type GoogleAccountManager".

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