public interface GeofenceListener

// File: BGLocationTest.java
public void showForm() {
    Form hi = new Form("Hi World");
    hi.addComponent(new Label("Hi World"));

    Location loc = new Location();
    loc.setLatitude(51.5033630);
    loc.setLongitude(-0.1276250);

    Geofence gf = new Geofence("test", loc, 100, 100000);

    LocationManager.getLocationManager().addGeoFencing(GeofenceListenerImpl.class, gf);

    hi.show();
}

// File: GeofenceListenerImpl.java
public class GeofenceListenerImpl implements GeofenceListener {
    public void onExit(String id) {
        System.out.println("Exited "+id);
    }

    public void onEntered(String id) {
        System.out.println("Entered "+id);
    }
}