well the only way i know of is to use the objects x and y, and the player x and y, then check if the player is near it (if you know how to make a touch screen box, its like that) but if you dont know its like (lets say item x/y is 3)
IF PX>3 AND PX<3.9 THEN
IF PY>3 AND PY<3.9 THEN
BEEP 5
ENDIF
ENDIF
something like this i think.