Android studio isn't picking up those libraries.
IME there are 2 ways of importing these (I have only had success with the first):
1) copy the source parallel to your own (ie example.com)
2a) include the jar in a libs folder and tell AS to look out for it. (right click will typically provide a good option that I can't recall)
2b) because Android can struggle (ie I couldn't do it, though inroads may have been made since) with importing jars, you may need to use AAR's (android library packages, Android Archive Library (aar) vs standard jar)
However, because this is an open source project, this should all be handled auto-magically for you via the gradle scripts included in the distro.