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;
}
}
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