Eclipse Mobile Mousw Przewodnik Instalacji Pobierz pdf (Strona 30)

Section 3 – Locate Your Position with Built-in GPS

 Use built-in Android GPS by copying the following code in the class of public void

onCreate(Bundle savedInstanceState){…}.

/* Use the LocationManager class to obtain GPS locations */

mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);

mlocManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 5*1000, 10,

mlocListener);

 Define necessary variables; specifically Lon and Lat are longitude and latitude of the built-in

GPS location.

double Lon = 0;

double Lat = 0;

private LocationManager mlocManager;

private LocationListener mlocListener = new MyLocationListener();

private MyOverlay myOverlay = new MyOverlay(null);

 Physically create a class of MyLocationListenor and add unimplemented methods as follows.

class MyLocationListener implements LocationListener{…}

 Physically create a class of MyOverlay and add constructor and unimplemented methods as

follows.

 Edit the method when location is changed in onLocationChanged as follows.

public void onLocationChanged(Location location)

{

Lon = location.getLongitude();

Lat = location.getLatitude();

point = new GeoPoint((int)(Lat*1e6), (int)(Lon*1e6));

mapView.getOverlays().add(myOverlay);

mapController.animateTo(point);

}

 Edit the method of updating the geo-point when location is changed in onDraw() as follows.

protected void onDraw(Canvas arg0, MapView arg1)

{

Paint paint = new Paint();

paint.setColor(Color.RED);

Point screenPoint = new Point();

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Eclipse Mobile Mousw Przewodnik Instalacji Strona 30