Does it have to be an overlay? If it's just an image then you can simply add it as a view to the mapView.
An overlay is just a layer. Unless you fill it with objects, nothing will show. On Mar 10, 1:54 pm, Bastiaan <[email protected]> wrote: > Hello, > > I want to overlay a map image (.jpg) over the Google Maps mapview. > The problem is: The overlay image is not showing, who knows what's the > problem? > > There is no error in logcat and the MapView is working. > > The code: > > package nl.ultimo.android.skikaart; > > 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.graphics.Rect; > import android.os.Bundle; > > public class MapsActivity extends MapActivity > { > Bitmap bmp; //Loaded bitmap in memory > GeoPoint min; //Top left corner (lat/long) > GeoPoint max; //Right bottom corner (lat/long) > > /** Called when the activity is first created. */ > @Override > public void onCreate(Bundle savedInstanceState) > { > super.onCreate(savedInstanceState); > setContentView(R.layout.main); > > float lat1 = 45.19775f; > float lng1 = 6.28418333f; > float lat2 = 45.2636667f; > float lng2 = 6.17431667f; > > min = new GeoPoint((int)(lat1 * 1E6), (int)(lng1 * > 1E6)); // bounding rectangle > max = new GeoPoint((int)(lat2 * 1E6), (int)(lng2 * 1E6)); > > MapView mapView = (MapView) findViewById(R.id.mapView); > MapController ctrl = mapView.getController(); > > int x = (min.getLongitudeE6() + max.getLongitudeE6())/ 2; // > Select map center > int y = (min.getLatitudeE6() + max.getLatitudeE6())/ 2; > > ctrl.setCenter(new GeoPoint(y,x)); > ctrl.setZoom(12); //Set scale > mapView.setBuiltInZoomControls(true); //Enable zoom controls > > //Add overlay > MapOverlay mapOverlay = new MapOverlay(); > List<Overlay> listOfOverlays = mapView.getOverlays(); > listOfOverlays.clear(); > listOfOverlays.add(mapOverlay); > > mapView.invalidate(); > } > > class MapOverlay extends com.google.android.maps.Overlay > { > @Override > public boolean draw(Canvas canvas, MapView mapView, boolean > shadow, long when) > { > super.draw(canvas, mapView, shadow); > > //Translate the GeoPoint to screen pixels > Point screenPts = new Point(); > mapView.getProjection().toPixels(min, screenPts); > > //The overlay image > Bitmap bmp = BitmapFactory.decodeResource(getResources(), > R.drawable.skikaart); > > //Prepare two rectangles (pixels) > Point top_left = new Point(); > mapView.getProjection().toPixels(min, top_left); > Point bottom_right = new Point(); > mapView.getProjection().toPixels(max, bottom_right); > > Rect src = new Rect( 0,0,bmp.getWidth() - 1, > bmp.getHeight() - 1 ); > Rect dst = new Rect( top_left.x, > bottom_right.y,bottom_right.x,top_left.y ); > > canvas.drawBitmap(bmp, src, dst, null); > > return true; > } > } > > @Override > protected boolean isRouteDisplayed() { > return false; > } > > } -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
