Xác định vị trí của người dùng trên bản đồ osm

Question

Tôi đang làm việc trên một ứng dụng Android xác định vị trí người dùng trong bản đồ osm. Tôi có thể hiển thị vị trí của người dùng trên bản đồ, nhưng nếu vị trí thay đổi toàn bộ bản đồ được tải lại thì có gì sai? Ngoài ra làm thế nào tôi có thể tăng độ chính xác của vị trí người dùng? Và làm cách nào để tạo một vòng kết nối tăng và giảm theo độ chính xác (như được hiển thị trong Google)?

mã:

public class OsmDemoActivity extends Activity implements LocationListener, 
    MapViewConstants 
{ 
private MapView mMapView; 
private MapController mapController; 
private LocationManager mLocMgr; 
private ItemizedOverlay<OverlayItem> mMyLocationOverlay; 
private ResourceProxy mResourceProxy; 

ArrayList<OverlayItem> items; 

@Override 
public void onCreate(Bundle savedInstanceState) 
{ 
    super.onCreate(savedInstanceState); 
    mResourceProxy = new DefaultResourceProxyImpl(getApplicationContext()); 
    setContentView(R.layout.main); 
    //mMapView.setUseDataConnection(false); 
    initilaizeMap(); 
    //addOverlay(); 
    mLocMgr = (LocationManager) getSystemService(LOCATION_SERVICE); 
    mLocMgr.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);  
} 

public void initilaizeMap() 
{ 
    mMapView = (MapView) this.findViewById(R.id.mapView); 
    mMapView.setTileSource(TileSourceFactory.MAPNIK); 



    //mMapView.setUseDataConnection(false); 



    mMapView.setBuiltInZoomControls(true); 
    mMapView.setMultiTouchControls(true); 
    mapController = this.mMapView.getController(); 
    mapController.setZoom(15); 
    mapController.setCenter(new GeoPoint(15.610762,32.540345)); 


    /* 
    final MyLocationOverlay myLocationOverlay = new MyLocationOverlay(this, mMapView, 
      mResourceProxy); 
    myLocationOverlay.enableMyLocation(); 
    //myLocationOverlay.disableMyLocation(); // not on by default 
    myLocationOverlay.disableCompass(); 
    myLocationOverlay.disableFollowLocation(); 
    myLocationOverlay.setDrawAccuracyEnabled(true); 
    myLocationOverlay.runOnFirstFix(new Runnable() { 
     public void run() { 
      mapController.animateTo(myLocationOverlay 
        .getMyLocation()); 
     } 
    }); 
    //ArrayList<OverlayItem> mOsmOverlays; 
    //mOsmOverlays.add(myLocationOverlay); 
    */ 
} 

public void addOverlay() 
{ 
    GeoPoint point2 = new GeoPoint(53554070, -2959520); // centre map here 
    GeoPoint point3 = new GeoPoint(53554070 + 1000, -2959520 + 1000); // icon goes here 
    GeoPoint point4 = new GeoPoint(15.610844, 32.540045); 
    GeoPoint point5 = new GeoPoint(15610844 + 40, 32540045 + 40); 
    GeoPoint point6 = new GeoPoint(15610844 + 50, 32540045 + 50); 
    GeoPoint point7 = new GeoPoint(15610844 + 10, 32540045 +10); 
    mapController.setCenter(point4); 
    items = new ArrayList<OverlayItem>(); 
    // Put overlay icon a little way from map center 
    items.add(new OverlayItem("Here5", "SampleDescription", point5)); 
    items.add(new OverlayItem("Here6", "SampleDescription", point6)); 
    items.add(new OverlayItem("Here7", "SampleDescription", point7)); 
    /* OnTapListener for the Markers, shows a simple Toast. */ 
    this.mMyLocationOverlay = new ItemizedIconOverlay<OverlayItem>(items, 
      new ItemizedIconOverlay.OnItemGestureListener<OverlayItem>() { 
       @Override 
       public boolean onItemSingleTapUp(final int index, 
         final OverlayItem item) { 
        Toast.makeText( 
          OsmDemoActivity.this, 
          "Item onItemSingleTapUp '" + item.mTitle, Toast.LENGTH_LONG).show(); 
        return true; // We 'handled' this event. 
       } 
       @Override 
       public boolean onItemLongPress(final int index, 
         final OverlayItem item) { 
        Toast.makeText( 
          OsmDemoActivity.this, 
          "Item onItemLongPress '" + item.mTitle ,Toast.LENGTH_LONG).show(); 
        return false; 
       } 
      }, mResourceProxy); 
    this.mMapView.getOverlays().add(this.mMyLocationOverlay); 
    mMapView.invalidate(); 
} 

public void displayLocation(GeoPoint loc) 
{ 
    mapController.setCenter(loc); 
    items = new ArrayList<OverlayItem>(); 
    // Put overlay icon a little way from map center 
    items.add(new OverlayItem("Here u r", "SampleDescription", loc)); 
    /* OnTapListener for the Markers, shows a simple Toast. */ 
    this.mMyLocationOverlay = new ItemizedIconOverlay<OverlayItem>(items, 
      new ItemizedIconOverlay.OnItemGestureListener<OverlayItem>() { 
       @Override 
       public boolean onItemSingleTapUp(final int index, 
         final OverlayItem item) { 
        Toast.makeText( 
          OsmDemoActivity.this, 
          "Item onItemSingleTapUp '" + item.mTitle, Toast.LENGTH_LONG).show(); 
        return true; // We 'handled' this event. 
       } 
       @Override 
       public boolean onItemLongPress(final int index, 
         final OverlayItem item) { 
        Toast.makeText( 
          OsmDemoActivity.this, 
          "Item onItemLongPress '" + item.mTitle ,Toast.LENGTH_LONG).show(); 
        return false; 
       } 
      }, mResourceProxy); 
    mMapView.getOverlays().clear(); 
    this.mMapView.getOverlays().add(this.mMyLocationOverlay); 
    //mMapView.invalidate(); 
} 

public void onLocationChanged(Location location) 
{ 
    int lat = (int) (location.getLatitude() * 1E6); 
    int lng = (int) (location.getLongitude() * 1E6); 
    GeoPoint gpt = new GeoPoint(lat, lng); 
    //mapController.setCenter(gpt); 
    //mMapView.invalidate(); 
    displayLocation(gpt); 
} 

    @Override 
    public void onProviderDisabled(String arg0) {} 
    @Override 
    public void onProviderEnabled(String provider) {} 
    @Override 
    public void onStatusChanged(String provider, int status, Bundle extras) {} 

} 

Answer 1

Bạn phải sử dụng một vị trí thay đổi người nghe Có lẽ điều này có thể giúp bạn

Thính giả:

package dispatch.driver.osmMaps; 

import org.osmdroid.util.GeoPoint; 

import android.location.Location; 
import android.location.LocationListener; 
import android.os.Bundle; 
import android.widget.Toast; 

public class OsmGeoUpdateHandler implements LocationListener 
{ 

    private OsmMapsActivity mMapActivity; 

    public OsmGeoUpdateHandler(OsmMapsActivity aMapActivity) 
    { 
     this.mMapActivity = aMapActivity; 

    } 

    @Override 
    public void onLocationChanged(Location location) 
    { 
     Toast.makeText(mMapActivity, 
       "latitude = " + location.getLatitude() * 1e6 + " longitude = " + location.getLongitude() * 1e6, 
       Toast.LENGTH_SHORT).show(); 

     int latitude = (int) (location.getLatitude() * 1E6); 
     int longitude = (int) (location.getLongitude() * 1E6); 
     GeoPoint point = new GeoPoint(latitude, longitude); 
     mMapActivity.updateCarPosition(point); 
    } 

    @Override 
    public void onProviderDisabled(String provider) 
    { 
     // TODO Auto-generated method stub 

    } 

    @Override 
    public void onProviderEnabled(String provider) 
    { 
     // TODO Auto-generated method stub 

    } 

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

    } 

} 

lớp OsmMapActivity (làm thế nào để sử dụng nghe)

public class OsmMapsActivity extends Activity 
{ 
    // final private int MAP_DEFAULT_ZOOM = 14; 
    final private double MAP_DEFAULT_LATITUDE = 44.445883; 
    final private double MAP_DEFAULT_LONGITUDE = 26.040963; 

    private MapView mMapView; 
    private ResourceProxy mResourceProxy; 
    private OsmMapsItemizedOverlay mItemizedOverlay; 
    private MyLocationOverlay mMyLocationOverlay; 
    private LocationManager locationManager; 
    private OverlayItem lastPosition = null; 
    private Order mOrder; 
    OsmGeoUpdateHandler mUpdateHandler; 
    private ArrayList<OverlayItem> mItems = new ArrayList<OverlayItem>(); 

    @Override 
    public void onCreate(Bundle savedInstanceState) 
    { 
     super.onCreate(savedInstanceState); 

     // Specify the XML layout to use: 
     setContentView(R.layout.osmmap); 

     mResourceProxy = new DefaultResourceProxyImpl(getApplicationContext()); 
     mMapView = (MapView) findViewById(R.id.mapview); 

     // Setup the mapView controller: 
     mMapView.setBuiltInZoomControls(true); 
     mMapView.setMultiTouchControls(true); 
     mMapView.setClickable(true); 
     mMapView.setUseDataConnection(false); 
     mMapView.setTileSource(TileSourceFactory.MAPNIK); 
     mMapView.getController().setZoom(12); 


     /* location manager */ 
     locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); 
     mUpdateHandler = new OsmGeoUpdateHandler(this); 
     Location location = null; 

     for (String provider : locationManager.getProviders(true)) 
     { 
      location = locationManager.getLastKnownLocation(provider); 
      if (location != null) 
      { 
       //location.setLatitude(MAP_DEFAULT_LATITUDE); 
       //location.setLongitude(MAP_DEFAULT_LONGITUDE); 
       locationManager.requestLocationUpdates(provider, 0, 0, mUpdateHandler); 
       break; 
      } 
     } 

     //add car position 
     if (location == null) 
     { 
      location = new Location(LocationManager.GPS_PROVIDER); 
      location.setLatitude(MAP_DEFAULT_LATITUDE); 
      location.setLongitude(MAP_DEFAULT_LONGITUDE); 
      updateCarPosition(new GeoPoint(location)); 
     } 

    } // end onCreate() 
public void updateCarPosition(GeoPoint aPoint) 
    { 
     if (mItemizedOverlay == null) 
     { 
      return; 
     } 
     OverlayItem overlayItem; 

     /* remove last position marker */ 
     removeLastPosition(lastPosition); 

     overlayItem = new OverlayItem("Center", "Center", (GeoPoint) aPoint); 

     lastPosition = overlayItem; 

     mItemizedOverlay.addOverlay(overlayItem); 


     mMapView.getOverlays().add(mItemizedOverlay); 
     mMapView.getController().animateTo(aPoint); 

    } 
}