Integrating google drive with a 2.1+ android application

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http://stackoverflow.com – I'm trying to have my apps sync their database with drive so that the app data is n'sync throughout all his devices. I did some research and found this quickstart, Dr.Edit but when I downloaded the source code for a closer inspection I realised it's for 4.1+. Surprised, I checked the google drive app on google play and found out you can install it on 2.1+. I understand that later versions of android OS not only work better but make our work as developer easier. However I am surprised I cannot find much about integrating google drive with older versions. If we check the current distribution of (HowTos)