Question

I’ve created my own custom map to show my current location and multiple points on map. it works fine,but now i would like to show a route from my current location to every point on the map.Can you give me some suggestions how i can do that? thx.

this is my customMap activity:

public class CustomMapActivity extends MapActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_map);

         String   provider = ""; 
         Criteria crit = new Criteria();
         Location loc = new Location("");
         LocationManager mlocManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);

         MapView mapView = (MapView) findViewById(R.id.mapview);
         mapView.setBuiltInZoomControls(true);

         List<Overlay> mapOverlays = mapView.getOverlays();
         Drawable drawable = this.getResources().getDrawable(R.drawable.marker);
         ItemizedOverlayedClass itemizedoverlay = new ItemizedOverlayedClass(drawable, this);

            try
            { 
             MyLocationOverlay mylocationOverlay = new MyLocationOverlay(this, mapView);
             mylocationOverlay.enableMyLocation();
             mapView.getOverlays().add(mylocationOverlay);          
             provider = mlocManager.getBestProvider(crit, false);
             loc = mlocManager.getLastKnownLocation(provider);
            }
            catch(Exception ex)
            {
            //Toast.makeText(this, "Unable to retrive provider", Toast.LENGTH_LONG).show();
            }


        for (ServiceActivity activity : DataSources.ActivitiesList)
        { 
            try
            {
                Location siteLocation =  new Location("");
                siteLocation.setLatitude(activity.SiteLatitude);
                siteLocation.setLongitude(activity.SiteLongitude);

                GeoPoint point = new GeoPoint((int)(activity.SiteLatitude * 1e6),(int)(activity.SiteLongitude * 1e6));
                OverlayItem overlayitem = new OverlayItem(point, activity.SiteName+ " " + activity.SiteAddress, "Distance to this location: " + String.valueOf(loc.distanceTo(siteLocation)/1000) + " km");

                itemizedoverlay.addOverlay(overlayitem);
                mapOverlays.add(itemizedoverlay);
            }
            catch(Exception ex)
            {
                @SuppressWarnings("unused")
                AlertDialogClass alert =  new AlertDialogClass(this,ex.getMessage());
            }
        }   




    }

    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        //mylocationOverlay.enableMyLocation();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_map, menu);
        return true;
    }

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


}

and this is the overlay class:

package com.example.srwebservice;


import java.util.ArrayList;

import android.app.AlertDialog;
import android.content.Context;
import android.graphics.drawable.Drawable;

import com.google.android.maps.ItemizedOverlay;
import com.google.android.maps.OverlayItem;

public class ItemizedOverlayedClass extends ItemizedOverlay {

    private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>();
    Context mContext;

    public ItemizedOverlayedClass(Drawable defaultMarker) 
    {
        super(boundCenterBottom(defaultMarker));
        // TODO Auto-generated constructor stub
    }

    public ItemizedOverlayedClass(Drawable defaultMarker, Context context) 
    {
      super(boundCenterBottom(defaultMarker));
      mContext = context;
    }

    @Override
    protected OverlayItem createItem(int i) 
    {
        // TODO Auto-generated method stub
         return mOverlays.get(i);
    }

    @Override
    public int size()
    {
      return mOverlays.size();
    }

    public void addOverlay(OverlayItem overlay)
    {
        mOverlays.add(overlay);
        populate();
    }
    @Override
    protected boolean onTap(int index) {
      OverlayItem item = mOverlays.get(index);
      AlertDialog.Builder dialog = new AlertDialog.Builder(mContext);
      dialog.setTitle(item.getTitle());
      dialog.setMessage(item.getSnippet());
      dialog.show();
      return true;
    }
}

Answer 1

i found a simpler solution.I can use google maps intent directly, and i don’t need to create a custom map activity anymore:

if(DataSources.ActivitiesList.length >0)
{
  String address = "http://maps.google.com/maps?daddr=" +    DataSources.ActivitiesList[0].SiteLatitude.toString() + "," + DataSources.ActivitiesList[0].SiteLongitude.toString();
for (int i= 1 ;i <  DataSources.ActivitiesList.length ; i++) 
{
    if(DataSources.ActivitiesList[i].SiteLatitude != null)
        address += "+to:" + DataSources.ActivitiesList[i].SiteLatitude + "," + DataSources.ActivitiesList[i].SiteLongitude;
}
Intent intent = new Intent(android.content.Intent.ACTION_VIEW, Uri.parse(address));
    startActivity(intent);
    break;      
}