How to compare 2 positions PLEASE

How to compare 2 positions PLEASE

I have an App with a TextView that finds your location and when you move,
the TextView changes.
I want to know what can I do in order to register the first location and
then look for the location 5 min after. for example
min 0 LAT 000000 LONG 000000
( SAVE IT )
min 5
LAT 1111111 LONG 111111
if min0 == min 5
...
To sum up, I want to compare 2 strings (lat & long at the beggining) and
lat&long 5 minutes after.