I am trying to use the Google maps API on my android app. I

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Asked: June 15, 20262026-06-15T09:16:23+00:00 2026-06-15T09:16:23+00:00

I am trying to use the Google maps API on my android app. I

0

I am trying to use the Google maps API on my android app. I have set an overlay item at a particular geopoint co-ordinate. On opening the activity, it uses the default mapview of the google map with the correct location of the overlay item for that geotpoint. My question is, how do I set the view to be zoomed in for that geopoint so one would actually see the location in a better fashion rather than having to manually zoom in by tracing the overlay item. I wish to zoom it so I can see the local area so the user can at least derive useful information from it.
My code is as follows:

/—- HelloItemizedOverlay.java ——-/

public class HelloItemizedOverlay extends ItemizedOverlay<OverlayItem> {

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

public void addOverlay(OverlayItem overlay)
{
    mOverlays.add(overlay);
    populate();
}

public HelloItemizedOverlay(Drawable defaultMarker) {
    super(boundCenterBottom(defaultMarker));
    // TODO Auto-generated constructor stub
}
public HelloItemizedOverlay(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() {
    // TODO Auto-generated method stub
    return mOverlays.size();
}

@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;
}
}

/*—- MainActivity.java —- */

public class MainActivity extends MapActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    MapView view = (MapView)findViewById(R.id.themap);
    view.setBuiltInZoomControls(true);

    final GeoPoint point = new GeoPoint(19240000,-99120000);
    OverlayItem overlayitem = new OverlayItem(point, "Hola, Mundo!", "I'm in Mexico City!");

    GeoPoint point2 = new GeoPoint(35410000, 139460000);
    OverlayItem overlayitem2 = new OverlayItem(point2, "Sekai, konichiwa!", "I'm in Japan!");


    final MapController control = view.getController();
    LocationManager manager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
    LocationListener listener = new LocationListener() {

        @Override
        public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onProviderEnabled(String arg0) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onProviderDisabled(String arg0) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onLocationChanged(Location arg0) {
            // TODO Auto-generated method stub
            control.setCenter(point);
        }
    };

    manager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, listener);
    List<Overlay> mapOverlays = view.getOverlays();
    Drawable drawable = this.getResources().getDrawable(R.drawable.ic_launcher);
    HelloItemizedOverlay itemizedoverlay = new HelloItemizedOverlay(drawable, this);


    itemizedoverlay.addOverlay(overlayitem2);
    itemizedoverlay.addOverlay(overlayitem);
    mapOverlays.add(itemizedoverlay);




}



@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_main, menu);
    return true;
}

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

}