title: Authorize a Google Drive Service java with Client Login?
body: <p>With the DocumentsList API, there was the possibility to authorize a DocsService, and so make authorized request with the Client Login method, i.e. service.setUserCredential(username,password).</p>
  
  <p>Now that both DocumentsList and ClientLogin have been deprecated, is there a similar way to authorize a Drive service, without using tokens and authorization requests? Otherwise, if my application does not need to access logged user's data, but just a specific account's data (i.e. account of the application itself), what is the best way to authorize the Drive service to that specific account?</p>