senzors attached on the mobile devices

hi
i'm intrested in programing mobile devices with attached senzors on the them.
can you tell me some good books?

Hi i like to make web services on mobile phone .web services is:mobile phone sent the location given by the gps sistem on the mobile devices and returns(answer) are all restoraunt that are in that location.


Also on the mobile devices has attached sensor what detected some action(and then mobile device sends the location given by the gps system)

Can describe me adventages and bed thinks if i use java and adventages...