让overlayItems全部显示

如果有时间加了很多overlayItem，由于缩放问题 有些不能显示为了全部显示

public void centerOverlays() { 
    int minLat = 81 * MapStoresController.MAP_SCALE; 
    int maxLat = -81 * MapStoresController.MAP_SCALE; 
    int minLon = 181 * MapStoresController.MAP_SCALE; 
    int maxLon = -181 * MapStoresController.MAP_SCALE; 
 
    for (int i = 0; i < overlayItems.size(); i++) { 
        Store s = overlayItems.getItem(i).getStore(); 
        minLat = (int) ((minLat > (s.getLocation().getLatitude() * MapStoresController.MAP_SCALE)) ? s.getLocation().getLatitude() * MapStoresController.MAP_SCALE :    minLat); 
        maxLat = (int) ((maxLat < (s.getLocation().getLatitude() * MapStoresController.MAP_SCALE)) ? s.getLocation().getLatitude() * MapStoresController.MAP_SCALE : maxLat); 
        minLon = (int) ((minLon > (s.getLocation().getLongitude() * MapStoresController.MAP_SCALE)) ? s.getLocation().getLongitude() * MapStoresController.MAP_SCALE : minLon); 
        maxLon = (int) ((maxLon < (s.getLocation().getLongitude() * MapStoresController.MAP_SCALE)) ? .getLocation().getLongitude() * MapStoresController.MAP_SCALE : maxLon); 
    } 
 
    GeoPoint gp = controller.getUserLocation(); 
 
    minLat = (minLat > gp.getLatitudeE6()) ? gp.getLatitudeE6() : minLat; 
    maxLat = (maxLat < gp.getLatitudeE6()) ? gp.getLatitudeE6() : maxLat; 
    minLon = (minLon > gp.getLongitudeE6()) ? gp.getLongitudeE6() : minLon; 
    maxLon = (maxLon < gp.getLongitudeE6()) ? gp.getLongitudeE6() : maxLon; 
 
    mapView.getController().zoomToSpan((maxLat - minLat), (maxLon - minLon)); 
    mapView.getController().animateTo(new GeoPoint((maxLat + minLat) / 2, (maxLon + minLon) / 2)); 
} 

 

2.

/**
 * Fits the map with the passed in points so all points are visible.
 * @param mapController MapView controller
 * @param points list of points you want the map to contain
 */
private static void fitPoints(MapController mapController, List points) {
    // set min and max for two points
    int nwLat = -90 * 1000000;
    int nwLng = 180 * 1000000;
    int seLat = 90 * 1000000;
    int seLng = -180 * 1000000;
    // find bounding lats and lngs
    for (GeoPoint point : points) {
	nwLat = Math.max(nwLat, point.getLatitudeE6()); 
	nwLng = Math.min(nwLng, point.getLongitudeE6());
	seLat = Math.min(seLat, point.getLatitudeE6());
        seLng = Math.max(seLng, point.getLongitudeE6());
    }
    GeoPoint center = new GeoPoint((nwLat + seLat) / 2, (nwLng + seLng) / 2);
    // add padding in each direction
    int spanLatDelta = (int) (Math.abs(nwLat - seLat) * 1.1);
    int spanLngDelta = (int) (Math.abs(seLng - nwLng) * 1.1);
 
    // fit map to points
    mapController.animateTo(center);
    mapController.zoomToSpan(spanLatDelta, spanLngDelta);
}