Comment afficher l'itinéraire avec l'API Google Maps dans l'application Android?

Question

Je ne comprends pas et je ne peux pas le trouver par moi-même. Comment afficher (et mettre à jour) un itinéraire entre deux emplacements (par exemple, l'emplacement actuel du périphérique et sa destination) dans une application Android à l'aide de l'API Google Maps?

Answer 1

Voici le lien Click Here

package org.ci.geo.route.android; 

    import java.io.IOException; 
    import java.io.InputStream; 
    import java.net.MalformedURLException; 
    import java.net.URL; 
    import java.net.URLConnection; 
    import java.util.ArrayList; 
    import java.util.List; 

    import org.ci.geo.route.Road; 
    import org.ci.geo.route.RoadProvider; 

    import android.graphics.Bitmap; 
    import android.graphics.Canvas; 
    import android.graphics.Color; 
    import android.graphics.Paint; 
    import android.graphics.Point; 
    import android.graphics.Bitmap.Config; 
    import android.os.Bundle; 
    import android.os.Handler; 
    import android.os.Message; 
    import android.widget.LinearLayout; 
    import android.widget.TextView; 

    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; 

    public class MapRouteActivity extends MapActivity { 

      LinearLayout linearLayout; 
      MapView mapView; 
      private Road mRoad; 

      @Override 
      public void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.main); 
        mapView = (MapView) findViewById(R.id.mapview); 
        mapView.setBuiltInZoomControls(true); 

        new Thread() { 
          @Override 
          public void run() { 
            double fromLat = 49.85, fromLon = 24.016667, toLat = 50.45, toLon = 30.523333; 
            String url = RoadProvider 
                .getUrl(fromLat, fromLon, toLat, toLon); 
            InputStream is = getConnection(url); 
            mRoad = RoadProvider.getRoute(is); 
            mHandler.sendEmptyMessage(0); 
          } 
        }.start(); 
      } 

      Handler mHandler = new Handler() { 
        public void handleMessage(android.os.Message msg) { 
          TextView textView = (TextView) findViewById(R.id.description); 
          textView.setText(mRoad.mName + " " + mRoad.mDescription); 
          MapOverlay mapOverlay = new MapOverlay(mRoad, mapView); 
          List<Overlay> listOfOverlays = mapView.getOverlays(); 
          listOfOverlays.clear(); 
          listOfOverlays.add(mapOverlay); 
          mapView.invalidate(); 
        }; 
      }; 

      private InputStream getConnection(String url) { 
        InputStream is = null; 
        try { 
          URLConnection conn = new URL(url).openConnection(); 
          is = conn.getInputStream(); 
        } catch (MalformedURLException e) { 
          e.printStackTrace(); 
        } catch (IOException e) { 
          e.printStackTrace(); 
        } 
        return is; 
      } 

      @Override 
      protected boolean isRouteDisplayed() { 
        return false; 
      } 
    } 

    class MapOverlay extends com.google.android.maps.Overlay { 
      Road mRoad; 
      ArrayList<GeoPoint> mPoints; 

      public MapOverlay(Road road, MapView mv) { 
        mRoad = road; 
        if (road.mRoute.length > 0) { 
          mPoints = new ArrayList<GeoPoint>(); 
          for (int i = 0; i < road.mRoute.length; i++) { 
            mPoints.add(new GeoPoint((int) (road.mRoute[i][1] * 1000000), 
                (int) (road.mRoute[i][0] * 1000000))); 
          } 
          int moveToLat = (mPoints.get(0).getLatitudeE6() + (mPoints.get(
              mPoints.size() - 1).getLatitudeE6() - mPoints.get(0) 
              .getLatitudeE6())/2); 
          int moveToLong = (mPoints.get(0).getLongitudeE6() + (mPoints.get(
              mPoints.size() - 1).getLongitudeE6() - mPoints.get(0) 
              .getLongitudeE6())/2); 
          GeoPoint moveTo = new GeoPoint(moveToLat, moveToLong); 

          MapController mapController = mv.getController(); 
          mapController.animateTo(moveTo); 
          mapController.setZoom(7); 
        } 
      } 

      @Override 
      public boolean draw(Canvas canvas, MapView mv, boolean shadow, long when) { 
        super.draw(canvas, mv, shadow); 
        drawPath(mv, canvas); 
        return true; 
      } 

      public void drawPath(MapView mv, Canvas canvas) { 
        int x1 = -1, y1 = -1, x2 = -1, y2 = -1; 
        Paint paint = new Paint(); 
        paint.setColor(Color.GREEN); 
        paint.setStyle(Paint.Style.STROKE); 
        paint.setStrokeWidth(3); 
        for (int i = 0; i < mPoints.size(); i++) { 
          Point point = new Point(); 
          mv.getProjection().toPixels(mPoints.get(i), point); 
          x2 = point.x; 
          y2 = point.y; 
          if (i > 0) { 
            canvas.drawLine(x1, y1, x2, y2, paint); 
          } 
          x1 = x2; 
          y1 = y2; 
        } 
      } 
    }