加入路徑

Question

package ntryn.n; 
import java.util.List; 
import android.content.Context; 
import android.graphics.drawable.Drawable; 
import android.location.Location; 
import android.location.LocationListener; 
import android.location.LocationManager; 
import android.os.Bundle; 
import android.util.Log; 
import android.widget.Toast; 
import com.google.android.maps.GeoPoint; 
import com.google.android.maps.MapActivity; 
import com.google.android.maps.MapController; 
import com.google.android.maps.MapView; 
import com.google.android.maps.Overlay; 
import com.google.android.maps.OverlayItem; 

public class ntryn extends MapActivity 
{ 
    private MapView mapView; 
    private MapController mc; 

    GeoPoint p, p2, p3, p4; 
    List<Overlay> mapOverlays; 
    Drawable drawable, drawable2 , drawable3, drawable4; 
    HelloItemizedOverlay itemizedOverlay, itemizedOverlay2 , itemizedOverlay3, itemizedOverlay4; 

    /** Called when the activity is first created. */ 

    @Override 
    public void onCreate(Bundle savedInstanceState) 
    { 
     try{ 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     /* Use the LocationManager class to obtain GPS locations */ 
     LocationManager mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE); 
     LocationListener mlocListener = new MyLocationListener(); 
     mlocManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, mlocListener); 
     mapView = (MapView) findViewById(R.id.mapView); 

     // enable Street view by default 
     mapView.setStreetView(true); 

     // enable to show Satellite view 
     // mapView.setSatellite(true); 

     // enable to show Traffic on map 
     // mapView.setTraffic(true); 
     mapView.setBuiltInZoomControls(true); 

     mc = mapView.getController(); 
     //mapView.setStreetView(true); 
     //mapView.setSatellite(true); 
     mc.setZoom(12); 
     addOverLays(); 
     } 
     catch(Exception e){ 
     Log.d("eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee",e.getMessage()); 
     } 
    } 
    public void addOverLays(){ 
    String [] coordinates = {"30.084262490272522","31.33625864982605" ,"30.084123015403748", "51.5002" , "-0.1262","31.337149143218994"}; 
    double lat = 30.084262490272522, lat2 = 51.5002,lat3=29.987091422080994; 
    double log = 31.33625864982605, log2 = -0.1262,log3=31.43909454345703; 

    p = new GeoPoint((int) (lat * 1E6), (int) (log * 1E6)); 
    p2 = new GeoPoint((int) (lat2 * 1e6), (int) (log2 * 1e6)); 
    p3=new GeoPoint((int) (lat3 * 1e6), (int) (log3 * 1e6)); 
    mapOverlays = mapView.getOverlays(); 
    drawable = this.getResources().getDrawable(R.drawable.ballon); 
    drawable2 = this.getResources().getDrawable(R.drawable.ballon); 
    drawable3 = this.getResources().getDrawable(R.drawable.ballon); 

    itemizedOverlay = new HelloItemizedOverlay(drawable,this); 
    itemizedOverlay2 = new HelloItemizedOverlay(drawable2,this); 
    itemizedOverlay3 = new HelloItemizedOverlay(drawable3,this); 
    OverlayItem overlayitem = new OverlayItem(p, "Cairo", " over1"); 
    OverlayItem over2 = new OverlayItem(p2, "ulm", "over2"); 
    OverlayItem over3 = new OverlayItem(p3, "offff", "over3"); 

    itemizedOverlay.addOverlay(overlayitem); 
    mapOverlays.add(itemizedOverlay); 
    itemizedOverlay2.addOverlay(over2); 
    mapOverlays.add(itemizedOverlay2); 
    itemizedOverlay3.addOverlay(over3); 
    mapOverlays.add(itemizedOverlay3); 
    mc.setZoom(17); 
    //mc.animateTo(p); 
    } 


    /* Class My Location Listener */ 
    public class MyLocationListener implements LocationListener 
    { 
    @Override 
     public void onLocationChanged(Location loc) 
     { 
     GeoPoint point = new GeoPoint( (int) (loc.getLatitude() * 1E6), 
      (int) (loc.getLongitude() * 1E6)); 
     //DoubletoString(loc.getLatitude()); 
     //DoubletoString(loc.getLongitude()); 

     String Text = "My current location is: " + 
      "Latitud ="+ loc.getLatitude() + 
      "Longitud =" + loc.getLongitude(); 

     Toast.makeText(getApplicationContext(), Text, Toast.LENGTH_SHORT).show(); 
     mc.animateTo(point); 
     } 



    private void DoubletoString(double latitude) { 
     // TODO Auto-generated method stub 
    } 


    public void onProviderDisabled(String provider) 
    { 

     Toast.makeText(getApplicationContext(), "Gps Disabled", Toast.LENGTH_SHORT).show(); 
    } 


    public void onProviderEnabled(String provider) 
    { 
     Toast.makeText(getApplicationContext(), "Gps Enabled", Toast.LENGTH_SHORT).show(); 
    } 

    public void onStatusChanged(String provider, int status, Bundle extras) { } 
    protected boolean isRouteDisplayed() { 
     return false; 
    } 
    }/* End of Class MyLocationListener */ 

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

// i want to add path between this two overlay items 

Answer 1

我認爲你想知道的是：如果你有帶有兩個GeoPoints，你怎麼有重疊繪製兩點之間的直線覆蓋？

在您的覆蓋子類的draw()方法，你會做類似如下：

@Override 
public void draw(android.graphics.Canvas canvas, MapView mapView, boolean shadow) 
{ 

    GeoPoint point1, point2; 

    // Let's assume you've assigned values to these two GeoPoints now. 

    Projection projection = mapView.getProjection(); 
    Point startingPoint = projection.toPixels(point1, null); 
    Point endingPoint = projection.toPixels(point2, null); 

    // Create the path containing the line between the two points. 
    Path path = new Path(); 
    path.moveTo(startingPoint.x, startingPoint.y); 
    path.lineTo(endingPoint.x, endingPoint.y); 

    // Setup the paint. You'd probably do this outside of the draw() method to be more efficient. 
    Paint paint = new Paint(); 
    paint.setStyle(Paint.Style.STROKE); 
    // Can set other paint characteristics, such as width, anti-alias, color, etc.... 

    // Draw the path! 
    canvas.drawPath(path, paint); 
}