监听GeolocationEvent.UPDATE
事件。
此外,您似乎在侦听器之后立即手动调用处理程序;那么你的处理程序正在实例化一个新Geolocation
的而不是获取GeolocationEvent
纬度和经度。
使用XpenseIt教程中的 Google Geocoding API 的示例实现:
package
{
import flash.events.Event;
import flash.events.EventDispatcher;
import flash.events.GeolocationEvent;
import flash.sensors.Geolocation;
import mx.rpc.AsyncResponder;
import mx.rpc.AsyncToken;
import mx.rpc.events.FaultEvent;
import mx.rpc.events.ResultEvent;
import mx.rpc.http.HTTPService;
[Event(name="locationUpdate", type="flash.events.Event")]
public class GeolocationUtil extends EventDispatcher
{
protected var geo:Geolocation;
public var updateCount:int;
protected var service:HTTPService = new HTTPService();
public var location:String;
public var longitude:Number;
public var latitude:Number;
public function GeolocationUtil()
{
service.url = "https://maps.googleapis.com/maps/api/geocode/xml";
}
public function geoCodeAddress(address: String):AsyncToken
{
return service.send({address: address, sensor: Geolocation.isSupported});
}
public function getLocation():void
{
if (Geolocation.isSupported)
{
geo = new Geolocation();
geo.setRequestedUpdateInterval(500);
updateCount = 0;
geo.addEventListener(GeolocationEvent.UPDATE, locationUpdateHandler);
}
}
protected function locationUpdateHandler(event:GeolocationEvent):void
{
// Throw away the first location event because it's almost always the last known location, not current location
updateCount++;
if (updateCount == 1) return;
if (event.horizontalAccuracy <= 150)
{
trace("lat:" + event.latitude + " long:" + event.longitude + " horizontalAccuracy:" + event.horizontalAccuracy);
geo.removeEventListener(GeolocationEvent.UPDATE, locationUpdateHandler);
geo = null;
}
longitude = event.longitude;
latitude = event.latitude;
var token:AsyncToken = service.send({latlng: latitude+","+longitude, sensor: Geolocation.isSupported});
token.addResponder(new AsyncResponder(
function(event:ResultEvent, token:AsyncToken):void
{
// Map the location to city and state from the response address component
location = event.result.GeocodeResponse.result[0].address_component[3].long_name + ', '+ event.result.GeocodeResponse.result[0].address_component[5].long_name;
dispatchEvent(new Event("locationUpdate"));
},
function (event:FaultEvent, token:AsyncToken):void
{
// fail silently
trace("Reverse geocoding error: " + event.fault.faultString);
}));
}
}
}