Using Google Maps in a Flex project

The following example shows how you can embed a Google map into a Flex/ActionScript 3.0 project.

Full code after the jump.

Before getting started, you need to first get an API key from Google and then download the mapping component and put it in your /libs/ folder in your Flex Builder 3 project:

• Click here to get Google Maps API key.
• Click here to download the Google Maps ActionScript 3.0 component.
• Copy the map_flex_1_5.swc file from the .ZIP file’s /lib/ directory and copy it into your Flex Project’s /libs/ directory.

View MXML

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/08/03/using-google-maps-in-a-flex-project/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white"
        creationComplete="init();">

    <mx:Script>
        <![CDATA[
            import com.google.maps.LatLng;
            import com.google.maps.Map;
            import com.google.maps.MapEvent;
            import com.google.maps.controls.MapTypeControl;
            import com.google.maps.controls.PositionControl;
            import com.google.maps.controls.ZoomControl;
            import com.google.maps.services.ClientGeocoder;
            import com.google.maps.services.GeocodingEvent;
            import com.google.maps.services.GeocodingResponse;
            import com.google.maps.services.Placemark;
            import mx.controls.Alert;
            import mx.events.ResizeEvent;

            private var googleMap:Map;
            private var geocoder:ClientGeocoder;

            private function init():void {
                googleMap = new Map();
                googleMap.key = APP_ID;
                googleMap.addEventListener(MapEvent.MAP_READY, googleMap_mapReady);
                googleMap.setSize(new Point(mapContainer.width, mapContainer.height));
                googleMap.addControl(new ZoomControl());
                googleMap.addControl(new MapTypeControl());

                mapContainer.addChild(googleMap);
            }

            private function geocoder_geocodingSuccess(evt:GeocodingEvent):void {
                var result:Placemark = GeocodingResponse(evt.response).placemarks[0];
                googleMap.setCenter(result.point, 13);
            }

            private function geocoder_geocodingFailure(evt:GeocodingEvent):void {
                Alert.show("Unable to geocode address: " + evt.name);
            }

            private function googleMap_mapReady(evt:MapEvent):void {
                geocoder = new ClientGeocoder();
                geocoder.addEventListener(GeocodingEvent.GEOCODING_SUCCESS, geocoder_geocodingSuccess);
                geocoder.addEventListener(GeocodingEvent.GEOCODING_FAILURE, geocoder_geocodingFailure);
                geocoder.geocode(textInput.text);
            }

            private function button_click(evt:MouseEvent):void {
                geocoder.geocode(textInput.text);
            }

            private function mapContainer_resize(evt:ResizeEvent):void {
                if (googleMap) {
                    googleMap.setSize(new Point(mapContainer.width, mapContainer.height));
                }
            }
        ]]>
    </mx:Script>

    <mx:String id="APP_ID" source="appid.txt" />

    <mx:ApplicationControlBar dock="true">
        <mx:Form styleName="plain">
            <mx:FormItem label="Address:"
                    direction="horizontal">
                <mx:TextInput id="textInput"
                        text="601 Townsend St, San Francisco, CA 94103" />
                <mx:Button id="button"
                        label="Submit"
                        click="button_click(event);" />
            </mx:FormItem>
        </mx:Form>
    </mx:ApplicationControlBar>

    <mx:UIComponent id="mapContainer"
            width="100%"
            height="100%"
            resize="mapContainer_resize(event);" />

</mx:Application>

View source is enabled in the following example.

For more information and examples, see the “Google Maps API for Flash homepage”.