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Location-Based services

Location-Based services. Maps. LBS og android. LBS er et add-on Understøttes af LBS- API et: to packages android.location com.google.android.maps. LocationManager. Faciliteter Find positionen Periodiske updates om positionen

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Location-Based services

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  1. Location-Based services

  2. Maps

  3. LBS og android • LBS er et add-on • Understøttes af LBS-APIet: to packages • android.location • com.google.android.maps

  4. LocationManager • Faciliteter • Find positionen • Periodiske updates ompositionen • “Fire” en application-specifiseretIntentnårtelefonenkommerinærhedenaf en given position • Applikationenkangøretre ting: • Spørgeefter listen afalleLocationProviderssomerkendtafLocationManager for deressidstekendte position. • Register/unregister for periodiskeopdateringeraf position fra en LocationProvider • Register/unregister for at en bestemtIntentbliver “fired” nårtelefonenkommertætpå en given position (specificeretved en radius I meter)

  5. Location • En klasse der repræsenterer en geografisk position på et bestemt tidspunkt (et "fix"). En placering består af en breddegrad og længdegrad og et UTC tidsstempel.

  6. Andre klasser • Address • Geocoder • (længdegrad, breddegrad) <-> adresse • Criteria • Bruges til valg af location provider • Batteri forbruug • GPS, mobilpositionering, akkuratesse, …

  7. Eksempel public voidonCreate(BundleSavedInstanceState) { … LocationManagerlocationManager; Stringcontext = Context.LOCATION_SERVICE; locationManager = (LocationManager)getSystemService(context); Stringprovider = LocationManager.GPS_PROVIDER; Location location = locationManager.getLastKnownLocation(provider); updateWithNewLocation(location); }

  8. updateWithNewLocation private voidupdateWithNewLocation(Location location) { StringlatLongString; … if (location != null) { double lat = location.getLatitude(); double lng = location.getLongitude(); latLongString = "Lat:" + lat + "\nLong:" + lng; } else { latLongString = "No location found"; } myLocationText.setText("Your Current Position is:\n" + latLongString); }

  9. Access • Giv tilgang til lokations-info: • I manifest-filen: <uses-permissionandroid:name="android.permission.ACCESS_FINE_LOCATION"/> • Eller • <uses-permissionandroid:name="android.permission.ACCESS_COARSE_LOCATION"/> • Barn af manifest-knuden

  10. Eksempel - opdateringer • Lav en LocationListener (typisk som anonym klasse) private final LocationListenerlocationListener = new LocationListener() { public voidonLocationChanged(Location location) { updateWithNewLocation(location); } public voidonProviderDisabled(Stringprovider){ updateWithNewLocation(null); } public voidonProviderEnabled(Stringprovider){ } public voidonStatusChanged(Stringprovider, int status, Bundleextras){ } };

  11. Anvend Listener • Brug den: locationManager.requestLocationUpdates (provider, 2000, 10, locationListener); Sende besked hvert 2000 msek Hvis telefonen er flyttet mindst 10 meter Beskeden skal sendes til dene

  12. Find lokationsprovider Criteriacriteria = new Criteria(); criteria.setAccuracy(Criteria.ACCURACY_FINE); criteria.setAltitudeRequired(false); criteria.setBearingRequired(false); criteria.setCostAllowed(true); criteria.setPowerRequirement(Criteria.POWER_LOW); //få bedste providerift kriterier Stringprovider = locationManager.getBestProvider(criteria, true)

  13. GoogleMaps • MapView • Activity som kan vise et Map • Ikke en del af std. Android • GoogleAPIs • Vælg det som tar-get platform

  14. Mapaccess • Tilladelse til at bruge net: <uses-permissionandroid:name="android.permission.INTERNET"/> • Brug map-pakke<uses-libraryandroid:name="com.google.android.maps" /> (del af <application>) • Begge dele i manifestfilen

  15. Map på brugergrænsefladen <com.google.android.maps.MapView android:id="@+id/mapview" android:layout_width="fill_parent" android:layout_height="fill_parent" android:clickable="true" android:apiKey="0Kvw2kImVeCzR7sPmK4LbRepVeJCyuDsw8EXC1Q" /> API key. Hvordan den fås se noter

  16. Eksempel public class HelloMapView extends MapActivity { MapViewmapView; @Override public voidonCreate(BundlesavedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mapView = (MapView) findViewById(R.id.mapview); mapView.setBuiltInZoomControls(true); Double lat = 55.412475*1E6; Double lng = 10.325496*1E6; GeoPoint point = new GeoPoint(lat.intValue(), lng.intValue()); MapControllermapController = mapView.getController(); mapController.setCenter(point); mapController.setZoom(10); } @Override protectedbooleanisRouteDisplayed() {return false;} }

  17. Tegne på kortet • Jeres opgave ;-) • I skal gennemgå tutorialenHelloMapViex.doc (lig http://developer.android.com/guide/tutorials/views/hello-mapview.html)

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