title: Android Bluetooth Altbeacon Calibration
body: <p>guys
  I'm using Altbeacon Android Library to do some Bluetooth app for demo. It provides with a getDistance() method that I can use to get distance between my phone and external Bluetooth device with Altbeacon protocol uploaded. However, as the devices are different, I think the distance might vary with a large error (I get 0.05m when I'm at 1m away, so on and so forth). This makes me think that if we do some calibration work for the getDistance() method will be useful. Is there any way of doing this? (Currently I have no idea how to modify the getDistance method, maybe @override it? Not very sure)
  Many thanks. </p>