Android Question A simple application to detect if a person is walking, running, cycling or in a vehicle - reg.

Hi,

I would like to develop a simple application in b4A that would detect if a person is walking, running, cycling or on a vehicle.
This application should be able to

a) Tell the activity that the person is performing
b) Be able to detect 'starting' of the activity and 'stopping' of the activity. After every stop event, it should show the 'Time Taken' and 'the Distance Covered' due to that activity.

Please guide me on how to go about this.