With the application METRO São Paulo, you have access to the map of São Paulos subway.
You can search stations directly on the map or in a list sorted by name, by line or by proximity of your position with the GPS.
METRO São Paulo allows you to calculate the shortest path between two stations : you select a start station and a finish station and the application will show you : the path between the stations, the number of connections and the steps of your path.