如何使用GPS坐标测量从当前位置到另一个位置的区域android

我正在开发Android平板电脑中的应用程序，我得到了一个新的要求，我需要找出一点到其他选定点之间的距离可以是任何一个请帮助我如何实现此目的如何使用GPS坐标测量从当前位置到另一个位置的区域android

我发现在谷歌地图中我们有一个选项叫做Measure in Labs菜单我需要相同类型的需求任何人都可以告诉我如何在Google地图中调用/实现以编程方式测量的特征。

请检查以下图片以获得更好的理解。

等待您的宝贵意见...... enter image description here

我使用下面的代码用于显示当前GPS位置，现在我需要知道如何指向其他位置并绘制线，然后测量区域请检查我的代码，并建议我

public class Tracking extends MapActivity implements LocationListener { 

    LocationManager locman; 
    LocationListener loclis; 
    Location Location; 
    private MapView map; 

    List<GeoPoint> geoPointsArray = new ArrayList<GeoPoint>(); 
    private MapController controller; 
    String provider = LocationManager.GPS_PROVIDER; 
    double lat; 
    double lon; 


    @Override 
     public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 
     initMapView(); 
     initMyLocation(); 
     locman = (LocationManager)getSystemService(Context.LOCATION_SERVICE); 
     //locman.requestLocationUpdates(provider,60000, 100,loclis); 
     //Location = locman.getLastKnownLocation(provider); 

     } 
    /** Find and initialize the map view. */ 
     private void initMapView() { 
     map = (MapView) findViewById(R.id.mapView); 
     controller = map.getController(); 
     map.setSatellite(false); 
     map.setBuiltInZoomControls(true); 
     } 

     /** Find Current Position on Map. */ 
     private void initMyLocation() { 
     final MyLocationOverlay overlay = new MyLocationOverlay(this, map); 
     overlay.enableMyLocation(); 
     overlay.enableCompass(); // does not work in emulator 
     overlay.runOnFirstFix(new Runnable() { 
      public void run() { 
       // Zoom in to current location 
       controller.setZoom(24); 
       controller.animateTo(overlay.getMyLocation()); 
      } 
     }); 
     map.getOverlays().add(overlay); 
     } 

    @Override 
    public void onLocationChanged(Location location) { 
     if (Location != null){ 
     lat = Location.getLatitude(); 
      lon = Location.getLongitude(); 
      GeoPoint New_geopoint = new GeoPoint((int)(lat*1e6),(int)(lon*1e6)); 
      controller.animateTo(New_geopoint); 
      geoPointsArray.add(New_geopoint); 


     } 

    } 
    public double getDistance(double lat1, double lon1, double lat2, double lon2) { 
     double latA = Math.toRadians(lat1); 
     double lonA = Math.toRadians(lon1); 
     double latB = Math.toRadians(lat2); 
     double lonB = Math.toRadians(lon2); 
     double cosAng = (Math.cos(latA) * Math.cos(latB) * Math.cos(lonB-lonA)) + 
         (Math.sin(latA) * Math.sin(latB)); 
     double ang = Math.acos(cosAng); 
     double dist = ang *6371; 
     return dist; 
    } 

    class MyOverlay extends Overlay{ 
     public MyOverlay(){ 
     } 
     public void draw(Canvas canvas, MapView mapv, boolean shadow){ 
     super.draw(canvas, mapv, shadow); 

     Projection projection = map.getProjection(); 
     Path p = new Path(); 
     for (int i = 0; i < geoPointsArray.size(); i++) { 
     if (i == geoPointsArray.size() - 1) { 
      break; 
     } 
     Point from = new Point(); 
     Point to = new Point(); 
     projection.toPixels(geoPointsArray.get(i), from); 
     projection.toPixels(geoPointsArray.get(i + 1), to); 
     p.moveTo(from.x, from.y); 
     p.lineTo(to.x, to.y); 
     } 
     Paint mPaint = new Paint(); 
     mPaint.setStyle(Style.STROKE); 
     mPaint.setColor(0xFFFF0000); 
     mPaint.setAntiAlias(true); 
     canvas.drawLine(0, 4,5,50, mPaint); 
     canvas.drawPath(p, mPaint); 
     super.draw(canvas, map, shadow); 
    } 
} 

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

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

    } 

    @Override 
    protected boolean isRouteDisplayed() { 
     // TODO Auto-generated method stub 
     return false; 
    } 

@Override 
public void onStatusChanged(String arg0, int arg1, Bundle arg2) { 
    // TODO Auto-generated method stub 

}}

来源

2012-05-11 Kiran_b

你知道两点的GPS坐标吗？ – Kousalik

你想用公里吗？ – Goofy

我想找到英亩面积 –