地理位置谷歌地圖v2

Question

我正在使用谷歌地圖V2獲取我當前的位置，以及行程 我的手機連接到互聯網和GPS工作，但結果令人失望 有些時候我有：「不可用」和同一時候，它gaves我在哪裏，我是連接不是當前 這裏laaast點的位置是我的代碼

public class ItineraryActivity extends Activity { 

private static final LatLng Event_place = new LatLng(33.59648, -7.664723); 
private static final LatLng MOUNTAIN_VIEW = new LatLng(37.4, -122.1); 
static final LatLng HAMBURG = new LatLng(53.558, 9.927); 
private GoogleMap map; 
private LocationManager service; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    // TODO Auto-generated method stub 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.mapevent); 
    findViewById(R.id.direction).setVisibility(View.INVISIBLE); 
    map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)) 
      .getMap(); 
    map.setMapType(GoogleMap.MAP_TYPE_NORMAL); 

    Marker hamburg = map.addMarker(new MarkerOptions() 
      .position(Event_place).title("Our event") 
      .snippet("We are waiting for you ..")); 

    map.moveCamera(CameraUpdateFactory.newLatLngZoom(Event_place, 15)); 
    /** Geo */ 
    service = (LocationManager) getSystemService(LOCATION_SERVICE); 
    boolean enabled = service 
      .isProviderEnabled(LocationManager.GPS_PROVIDER); 
    // Activer GPS 
    if (!enabled) { 
     Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS); 
     startActivity(intent); 
     Log.e("eeee", "law 3lem"); 

    } else { 
     Log.e("eeee", "law "); 
    } 
    // ** 
    Criteria criteria = new Criteria(); 
    String provider = service.getBestProvider(criteria, false); 
    Location location = service.getLastKnownLocation(provider); 
    // Initialize the location fields 
    if (location != null) { 
     System.out.println("Provider " + provider + " has been selected."); 
     onLocationChanged(location); 
     new Routing(this, map, Color.BLACK).execute(
       new LatLng(location.getLatitude(), location.getLongitude()), 
       Event_place); 

    } else { 
     Log.e("", "not available"); 
    } 


} 

public void onLocationChanged(Location location) { 
    double lat = (double) (location.getLatitude()); 
    double lng = (double) (location.getLongitude()); 

    Log.e("lat + long", String.valueOf(lat) + "/" + String.valueOf(lng)); 

    map.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(lat, lng), 
      14)); 
    map.addMarker(new MarkerOptions() 
      .position(new LatLng(lat, lng)) 
      .title("Vous êtes là") 
      .snippet("Nous comptons sur votre présence ...") 
      .icon(BitmapDescriptorFactory 
        .defaultMarker(BitmapDescriptorFactory.HUE_BLUE))); 
    map.animateCamera(CameraUpdateFactory.zoomTo(14), 2000, null); 
} 

}

Answer 1

試試這個代碼

public class ItineraryActivity extends Activity implements LocationListener { 

    public static final double A = 6372.8; // In kilometers 
    private static final LatLng Event_place = new LatLng(33.59648, -7.664723); 
    static final LatLng HAMBURG = new LatLng(53.558, 9.927); 
    private GoogleMap map; 
    private LocationManager service; 
    private LocationManager locationManager; 
    private String provider; 
    Marker mark; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.mapevent); 
     findViewById(R.id.direction).setVisibility(View.INVISIBLE); 
     map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)) 
       .getMap(); 
     map.setMapType(GoogleMap.MAP_TYPE_NORMAL); 

     Marker hamburg = map.addMarker(new MarkerOptions() 
       .position(Event_place).title("Our event") 
       .snippet("We are waiting for you ..")); 

     map.moveCamera(CameraUpdateFactory.newLatLngZoom(Event_place, 15)); 
     /** Geo */ 
     service = (LocationManager) getSystemService(LOCATION_SERVICE); 
     boolean enabledGPS = service 
       .isProviderEnabled(LocationManager.GPS_PROVIDER); 
     boolean enabledWiFi = service 
       .isProviderEnabled(LocationManager.NETWORK_PROVIDER); 
     if (!enabledGPS) { 
      Toast.makeText(this, "GPS signal not found", Toast.LENGTH_LONG) 
        .show(); 
      Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS); 
      startActivity(intent); 
     } 

     locationManager = (LocationManager) this 
       .getSystemService(Context.LOCATION_SERVICE); 

     // 
     boolean enabled = service 
       .isProviderEnabled(LocationManager.GPS_PROVIDER); 
     // Activer GPS 
     Criteria criteria = new Criteria(); 
     provider = locationManager.getBestProvider(criteria, false); 
     Location location = locationManager.getLastKnownLocation(provider); 

     // Initialize the location fields 
     if (location != null) { 
      Toast.makeText(this, "Selected Provider " + provider, 
        Toast.LENGTH_SHORT).show(); 
      onLocationChanged(location); 

      new Routing(this, map, Color.BLACK) 
        .execute(
          new LatLng(location.getLatitude(), location 
            .getLongitude()), Event_place); 
     } else { 

      // do something 
     } 
     // Initialize the location fields 

    } 

    public void onLocationChanged(Location location) { 

     // mark.remove(); 
     double lat = location.getLatitude(); 
     double lng = location.getLongitude(); 
     /*Toast.makeText(this, " Location " + lat + "," + lng, Toast.LENGTH_LONG) 
       .show();*/ 
     LatLng coordinate = new LatLng(lat, lng); 
     Toast.makeText(
       this, 
       "Location " 
         + coordinate.latitude 
         + "," 
         + coordinate.longitude 
         + "\n Distance :" 
         + haversine(coordinate.latitude, coordinate.longitude, 
           Event_place.latitude, Event_place.longitude) 
         + "Km", Toast.LENGTH_LONG).show(); 

     Log.e("lat + long", String.valueOf(lat) + "/" + String.valueOf(lng)); 

     map.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(lat, lng), 
       14)); 
     if (mark != null) { 

      mark.remove(); 
     } 

     mark = map.addMarker(new MarkerOptions() 
       .position(new LatLng(lat, lng)) 
       .title("Vous êtes là") 
       .snippet("Nous comptons sur votre présence ...") 
       .icon(BitmapDescriptorFactory 
         .defaultMarker(BitmapDescriptorFactory.HUE_BLUE))); 

     map.animateCamera(CameraUpdateFactory.zoomTo(14), 2000, null); 
    } 

    @Override 
    public void onProviderDisabled(String provider) { 
     // TODO Auto-generated method stub 
     Toast.makeText(this, "Enabled new provider " + provider, 
       Toast.LENGTH_SHORT).show(); 

    } 

    @Override 
    public void onProviderEnabled(String provider) { 
     // TODO Auto-generated method stub 
     Toast.makeText(this, " Disabled provider " + provider, 
       Toast.LENGTH_SHORT).show(); 
    } 

    @Override 
    public void onStatusChanged(String provider, int status, Bundle extras) { 
     // TODO Auto-generated method stub 

    } 

    /* Request updates at startup */ 
    @Override 
    protected void onResume() { 
     super.onResume(); 
     locationManager.requestLocationUpdates(provider, 400, 10, this); 
    } 

    /* Remove the locationlistener updates when Activity is paused */ 
    @Override 
    protected void onPause() { 
     super.onPause(); 
     locationManager.removeUpdates(this); 
    } 

    public double haversine(double lat1, double lon1, double lat2, double lon2) { 
     double dLat = Math.toRadians(lat2 - lat1); 
     double dLon = Math.toRadians(lon2 - lon1); 
     lat1 = Math.toRadians(lat1); 
     lat2 = Math.toRadians(lat2); 
     double a = Math.sin(dLat/2) * Math.sin(dLat/2) + Math.sin(dLon/2) 
       * Math.sin(dLon/2) * Math.cos(lat1) * Math.cos(lat2); 
     double c = 2 * Math.asin(Math.sqrt(a)); 
     return A * c; 
    } 
}