Question

Here I have used google map and an overlay. I have used an image of pushpin to point to the GeoPoint.

I want to set an OnClickListener event for the push pin. When user touches the pin, I want to toast a message. Below is the code.

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 android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Point;
import android.os.Bundle;
import android.widget.Toast;

public class Googlemap1_6Activity extends MapActivity 
{
    /** Called when the activity is first created. */
    MapView mapView;
    MapController mc;
    GeoPoint p;

class Mapoverlay extends com.google.android.maps.Overlay
{

    @Override
    public boolean draw(Canvas canvas, MapView mapView, boolean shadow,
            long when) 
    {
        // TODO Auto-generated method stub
        super.draw(canvas, mapView, shadow, when);

        Point screenPts =new Point();
            mapView.getProjection().toPixels(p, screenPts);
            Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.pushpin2);
            canvas.drawBitmap(bmp,  screenPts.x, screenPts.y-26, null);


        return true;
    }

    @Override
    public boolean onTap(GeoPoint pl, MapView mapView) {
        // TODO Auto-generated method stub


         if(pl.equals(p))
        {

             Toast.makeText(getBaseContext(),
                        "This is International Airport",
                        Toast.LENGTH_LONG).show();
         }

         return super.onTap(pl, mapView);
}

}

@Override
public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    String lat_coordinates[] ={"27.700556"};
    String lng_coordinates[] ={"85.3630"}; 

    Double lat = Double.parseDouble(lat_coordinates[0]);
    Double lng = Double.parseDouble(lng_coordinates[0]);

    p = new GeoPoint(
            (int) (lat*1E6),
            (int) (lng*1E6));

    mapView = (MapView) findViewById(R.id.mapView);
    mc=mapView.getController();
    mapView.setBuiltInZoomControls(true);
    mc.setZoom(10); 
    mc.animateTo(p);


    Mapoverlay MapOverlay  = new Mapoverlay();
    List<Overlay> listofOverlays = mapView.getOverlays();
    listofOverlays.clear();
    listofOverlays.add(MapOverlay);

    mapView.invalidate();


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

}

Answer 1

You Override your own Overlay, so you have to handle Tabs yourself. Why not using ItemizedOverlay. Override the onTab(int index) there and you are done.
It has also a useful hitTest Method.