下载/缓存Google地图以供离线使用

I'd like to be able to implement this in an Android app, and I thought it was possible with the newest Google Maps API release, but I haven't seen much discussion on the topic. Ideally, you'd be able to download/cache maps for a certain region for later offline use. Is it only possible to do this via the Google Maps 5 application and not the API without violating the ToS? I know OpenStreetMap and others allow this, but I believe Google Maps still offers superior mapping and the most widespread usage.I'd like to be able to implement this in an And