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GPS is a class that retrieves GPS coordinates read from Android, WP8, and iOS native API. This class only retrieves data updating the internal fields. If you want to display that data, you may use the GPSView class.
If the GPS fails connecting to the satellites, and the phone has signal, you can use the cell tower location as a rough location. The precision varies between 50m to 3km, depending on the phone location. In this case, you can get the latitude and longitude using CellInfo.toCoordinates() on Android and Windows 32. This won’t work on other platforms. Don’t forget to turn on the GPS, going to somewhere similar to Settings / Security & Location / Enable GPS satellites. You won’t be able to use if if it’s off in the settings.
Here is an example of GPS usage:
public void run()
gps = new GPS();
for (int i = 0; i < 60*2 && gps.location == 0; i++) // wait 60s
catch (Exception eee)