How to track position of an Android device in a building?

Question

I want to develop an application in which I need to know the position of my device within a building (the room in which the device currently is). GPS is not working in the b

Answer 1

Unfortunately there is no easy solution. Network location is out of the question, since it is not precise enough to show buildings, not even mentioning rooms. The only way I could think of for this to work is to use external sensors in building and somehow connect them with the device.