how to show multiple overlay on map in Android?

Question

I have item list with latitude and longitude .I want to show the item list on Google map.. so, how to create overlay list and how to show overlays on Google map ?

Answer 1

This is what i did on my project...

package org.nip.gmap;

import java.util.List;

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;
import android.graphics.drawable.Drawable;
import android.os.Bundle;

public class Main extends MapActivity {


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

    MapView map;
    MapController controller;
    List<Overlay> overlayList;
    int lat=0;
    int lng=0;

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

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

        overlayList = map.getOverlays();
        Drawable drawable = this.getResources().getDrawable(R.drawable.pushpin2);
        CustomPinpoint itemizedoverlay = new CustomPinpoint(drawable,this);


        double lat_coordinates[] ={27.700556,28.2642635,30.0018168,29.776669,29.4096819,29.4560611};
        double lng_coordinates[] ={85.3630,83.9735195,80.7382742,81.2518833,81.8115051,80.5403779};
        String place_name[] ={"kathmandu","Pokhara","Darchula","Bajhang","Bajura","Baitadi"};
        String place_info[] ={"Its an capital of Nepal","Its and tourist place of Nepal","Its one of the beautiful place in country side","CHD District Target:10 51,960, VDCs/Muncipalities reported:41/41","CHD District Target: 71,280, VDCs/Muncipalities reported: 47/47","CHD District Target:10 51,960, VDCs/Muncipalities reported:41/41","CHD District Target: 71,280, VDCs/Muncipalities reported: 7/7","CHD District Target:10 21,960, VDCs/Muncipalities reported:44/41","CHD District Target: 33,3123, VDCs/Muncipalities reported: 47/47"};

         try{
            for(int i=0; i<place_name.length; i++)
             {
                 GeoPoint point = new GeoPoint((int)(lat_coordinates[i]*1E6),(int)(lng_coordinates[i]*1E6));
                 OverlayItem overlayitem = new OverlayItem(point, place_name[i], place_info[i]);
                 itemizedoverlay.addOverlay(overlayitem);
             }
         }catch(NullPointerException e){
             e.getStackTrace();

         }
         finally{
            overlayList.add(itemizedoverlay);
         }

        controller = map.getController();
        controller.animateTo(new GeoPoint((int)(lat_coordinates[0]*1E6),(int)(lng_coordinates[0]*1E6)));
        controller.setZoom(8);


    }

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

}

Create new class...

package org.nip.gmap;

import java.util.ArrayList;

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

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

public class CustomPinpoint extends ItemizedOverlay<OverlayItem> {

    private ArrayList<OverlayItem> pinpoints = new ArrayList<OverlayItem>();
    private Context c;


    public CustomPinpoint(Drawable defaultMarker, Context context) {
        super(boundCenter(defaultMarker));
        c= context;

    }

//  public CustomPinpoint(Drawable M, Context context) {
//      
//      this(M);
//      c= context;
//  }

    public void addOverlay (OverlayItem overlay)
    {
        pinpoints.add(overlay);

        populate();
    }

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

    @Override
    public int size() {

        // TODO Auto-generated method stub
        return pinpoints.size();
    }
    @Override
    protected boolean onTap(int index) {
        // TODO Auto-generated method stub
        OverlayItem item = pinpoints.get(index);
        AlertDialog.Builder dialog = new AlertDialog.Builder(c);
        dialog.setTitle(item.getTitle());
        dialog.setMessage(item.getSnippet());
        dialog.show();
        return true;

    }


}

OnClickListener for pushpin