I am using the Google Client API and the GoogleAuthUtil.class to get access to the user's Google Drive Account.

String scope = "oauth2:" + DriveScopes.DRIVE;
String token = GoogleAuthUtil.getToken(getContext(), account.name, scope);

This is the whole magic. It worked the whole day but since a couple of hours I receive the following message when sending API calls:

com.google.api.client.googleapis.json.GoogleJsonResponseException: 403 Forbidden
 {
   "code": 403,
   "errors": [
     {
       "domain": "usageLimits",
       "message": "Daily Limit for Unauthenticated Use Exceeded. Continued use requires signup.",
       "reason": "dailyLimitExceededUnreg",
       "extendedHelp": "https://code.google.com/apis/console"
     }
   ],
   "message": "Daily Limit for Unauthenticated Use Exceeded. Continued use requires signup."
}

I dont know how to use a API Key from the console instead of an oauth2 authentication. There are two different "getToken()" messages. One has four parameters and the description for the last one says:

extras: Bundle containing additional information that may be relevant to the authentication scope.

But what do these information should look like? What informations do I have to put in the Bundle?