Animated Drawable MyLocationOverlay()
Is it possible to over-ride MyLocationOv开发者_Python百科erlay()'s onDraw method and replace the standard flashing blue icon with something else. What are the ways I could implement this?
Really good answer to your question here: myLocationOverlay change the marker
Draw an animated GIF image within the drawMyLocation(..)
function. Display Animated GIF
public class CurrentLocationOverlay extends MyLocationOverlay {
// TODO: use dynamic calculation?
private final static int PADDING_ACTIVE_ZOOM = 50;
private MapController mc;
private Bitmap marker;
private Point currentPoint = new Point();
private boolean centerOnCurrentLocation = true;
private int height;
private int width;
/**
* By default this CurrentLocationOverlay will center on the current location, if the currentLocation is near the
* edge, or off the screen. To dynamically enable/disable this, use {@link #setCenterOnCurrentLocation(boolean)}.
*
* @param context
* @param mapView
*/
public CurrentLocationOverlay(Context context, MapView mapView) {
super(context, mapView);
this.mc = mapView.getController();
this.marker = BitmapFactory.decodeResource(context.getResources(), R.drawable.position);
}
@Override
protected void drawMyLocation(Canvas canvas, MapView mapView, Location lastFix, GeoPoint myLocation, long when) {
// TODO: find a better way to get height/width once the mapView is layed out correctly
if (this.height == 0) {
this.height = mapView.getHeight();
this.width = mapView.getWidth();
}
mapView.getProjection().toPixels(myLocation, currentPoint);
canvas.drawBitmap(marker, currentPoint.x, currentPoint.y - 40, null);
}
@Override
public synchronized void onLocationChanged(Location location) {
super.onLocationChanged(location);
// only move to new position if enabled and we are in an border-area
if (mc != null && centerOnCurrentLocation && inZoomActiveArea(currentPoint)) {
mc.animateTo(getMyLocation());
}
}
private boolean inZoomActiveArea(Point currentPoint) {
if ((currentPoint.x > PADDING_ACTIVE_ZOOM && currentPoint.x < width - PADDING_ACTIVE_ZOOM)
&& (currentPoint.y > PADDING_ACTIVE_ZOOM && currentPoint.y < height - PADDING_ACTIVE_ZOOM)) {
return false;
}
return true;
}
public void setCenterOnCurrentLocation(boolean centerOnCurrentLocation) {
this.centerOnCurrentLocation = centerOnCurrentLocation;
}
}
精彩评论