Android sample app

This is v1 of the sample app. It doesn't include push; including push would require many more steps on the end-users part and would eliminate the "works out of the box" sample we're going for.
We might be able to look for an error number, I'm not sure if the error codes overlap. I did it this way so the end user explicitly sees that the app is looking for duplicates instead of an arbitrary "This didn't work" code.