how to get the latitude and longitude of a particular overlay item?

Question

My map code is this:

public class ExampleActivity extends MapActivity {
    private MapView map = null;
    private MyLocationOverlay me = null;

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

        map = (MapView) findViewById(R.id.map);

        map.getController().setCenter(getPoint(18.5236296, 73.8478429));
        map.getController().setZoom(17);
        map.setBuiltInZoomControls(true);

        Drawable marker = getResources().getDrawable(R.drawable.marker);

        marker.setBounds(0, 0, marker.getIntrinsicWidth(),
                marker.getIntrinsicHeight());

        map.getOverlays().add(new SitesOverlay(marker));

        me = new MyLocationOverlay(this, map);
        map.getOverlays().add(me);
    }

    @Override
    public void onResume() {
        super.onResume();

        me.enableCompass();
    }

    @Override
    public void onPause() {
        super.onPause();

        me.disableCompass();
    }

    @Override
    protected boolean isRouteDisplayed() {

        return (false);
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {

        if (keyCode == KeyEvent.KEYCODE_S) {

            map.setSatellite(!map.isSatellite());
            return (true);
        } else if (keyCode == KeyEvent.KEYCODE_Z) {

            map.displayZoomControls(true);
            return (true);
        }

        return (super.onKeyDown(keyCode, event));
    }

    private GeoPoint getPoint(double lat, double lon) {

        return (new GeoPoint((int) (lat * 1000000.0), (int) (lon * 1000000.0)));
    }

    private class SitesOverlay extends ItemizedOverlay<OverlayItem> {

        private List<OverlayItem> items = new ArrayList<OverlayItem>();
        private Drawable marker = null;
        private OverlayItem inDrag = null;
        private ImageView dragImage = null;
        private int xDragImageOffset = 0;
        private int yDragImageOffset = 0;
        private int xDragTouchOffset = 0;
        private int yDragTouchOffset = 0;

        public SitesOverlay(Drawable marker) {
            super(marker);
            this.marker = marker;

            dragImage = (ImageView) findViewById(R.id.drag);
            xDragImageOffset = dragImage.getDrawable().getIntrinsicWidth() / 2;
            yDragImageOffset = dragImage.getDrawable().getIntrinsicHeight();

            items.add(new OverlayItem(getPoint(18.5236296, 73.8478429), "Pune",
                    "Wakad"));

            populate();
        }

        @Override
        protected OverlayItem createItem(int i) {

            return (items.get(i));
        }

        @Override
        public void draw(Canvas canvas, MapView mapView, boolean shadow) {
            super.draw(canvas, mapView, shadow);

            boundCenterBottom(marker);
        }

        @Override
        public int size() {

            return (items.size());
        }

        @Override
        public boolean onTouchEvent(MotionEvent event, MapView mapView) {

            final int action = event.getAction();
            final int x = (int) event.getX();
            final int y = (int) event.getY();
            boolean result = false;

            if (action == MotionEvent.ACTION_DOWN) {

                for (OverlayItem item : items) {
                    Point p = new Point(0, 0);

                    map.getProjection().toPixels(item.getPoint(), p);

                    if (hitTest(item, marker, x - p.x, y - p.y)) {

                        result = true;
                        inDrag = item;
                        items.remove(inDrag);
                        populate();

                        xDragTouchOffset = 0;
                        yDragTouchOffset = 0;

                        setDragImagePosition(p.x, p.y);
                        dragImage.setVisibility(View.VISIBLE);

                        xDragTouchOffset = x - p.x;
                        yDragTouchOffset = y - p.y;

                        break;
                    }
                }
            } else if (action == MotionEvent.ACTION_MOVE && inDrag != null) {

                setDragImagePosition(x, y);
                result = true;
            } else if (action == MotionEvent.ACTION_UP && inDrag != null) {

                dragImage.setVisibility(View.GONE);

                GeoPoint pt = map.getProjection().fromPixels(
                        x - xDragTouchOffset, y - yDragTouchOffset);
                OverlayItem toDrop = new OverlayItem(pt, inDrag.getTitle(),
                        inDrag.getSnippet());

                items.add(toDrop);
                populate();

                inDrag = null;
                result = true;
            }

            return (result || super.onTouchEvent(event, mapView));
        }

        private void setDragImagePosition(int x, int y) {

            RelativeLayout.LayoutParams lp = (RelativeLayout.LayoutParams) dragImage
                    .getLayoutParams();

            lp.setMargins(x - xDragImageOffset - xDragTouchOffset, y
                    - yDragImageOffset - yDragTouchOffset, 0, 0);
            dragImage.setLayoutParams(lp);
        }
    }
}

this shows a marker on the map, and i can drag and drop this marker to some other place on the map....so now, my question is how to get the latitude and longitude of the current position of the marker??

Answer 1

In the onTouchListener of Drag and Drop Code, you can use the below code to get The GeoPoint

if (action == MotionEvent.ACTION_UP && inDrag != null) {
    GeoPoint pt = map.getProjection().fromPixels(
                        x - xDragTouchOffset, y - yDragTouchOffset);

    taplat = pt.getLatitudeE6() / 1E6; // latitude
    taplon = pt.getLongitudeE6() / 1E6; // longitude
}