Migration from Sync API v1 to Core API v2

As an indication of how complex all that Sync API caching was, my new Android app used to use Sync and is now using Core API v2.  I dropped the caching functionality and my app now only offers user-directed upload and download of its local document files.  My code is about the same in length.  But the Android APK file is half the size of what it was when I was linking with the Dropbox Sync libraries.   So that caching function was huge, and very non-trivial.  To really do background syncing and caching well is way beyond what most application developers want to get into.  Fortunately for my app, that functionality was not essential, and I think the new functionality will actually be more deterministic and easier for my users to understand.  But there may be others who are not so lucky.