ArcGIS API for Flex(三) 地图之间的切换

最近在学习flex,因为我的专业就是GIS（地理信息系统），所以就尝试着从ESRI上学习相关的知识，有不足之处请多多关照

下面是我直接调用ArcGIS的API，功能是地图之间的切换，运行效果图如下

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
			   xmlns:s="library://ns.adobe.com/flex/spark"
			   xmlns:esri="http://www.esri.com/2008/ags"
			   pageTitle="地图切换效果">
	<fx:Script>
		<![CDATA[
			import com.esri.ags.geometry.MapPoint;
			import com.esri.ags.layers.TiledMapServiceLayer;
			
			import mx.events.FlexEvent;
			
			private function layerShowHandler(event:FlexEvent):void
			{
				// update the LODs/zoomslider to use/show the levels for the selected base map
				var tiledLayer:TiledMapServiceLayer = event.target as TiledMapServiceLayer;
				myMap.lods = tiledLayer.tileInfo.lods;
			}
		]]>
	</fx:Script>
	
	<s:controlBarContent>
		<s:RichText width="100%" fontFamily="宋体" fontSize="16" fontWeight="bold" color="#006030">
			大家好，我叫陈洪磊，滁州学院地理信息与旅游与旅游学院2012级GIS专业学生，大学毕业后即将求职，有意聘用者请关注本博客，QQ937292955感谢您的关注
		</s:RichText>
	</s:controlBarContent>
	
	<esri:Map id="myMap"
			  level="4"
			  load="myMap.centerAt(new MapPoint(-11713000,4822000))">
		<esri:ArcGISTiledMapServiceLayer show="layerShowHandler(event)"
										 url="http://server.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer"
										 visible="{bb.selectedIndex == 0}"/>
		<esri:ArcGISTiledMapServiceLayer show="layerShowHandler(event)"
										 url="http://server.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer"
										 visible="{bb.selectedIndex == 1}"/>
		<esri:ArcGISTiledMapServiceLayer show="layerShowHandler(event)"
										 url="http://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer"
										 visible="{bb.selectedIndex == 2}"/>
		<esri:ArcGISTiledMapServiceLayer show="layerShowHandler(event)"
										 url="http://server.arcgisonline.com/ArcGIS/rest/services/Ocean_Basemap/MapServer"
										 visible="{bb.selectedIndex == 3}"/>
		<esri:ArcGISTiledMapServiceLayer show="layerShowHandler(event)"
										 url="http://server.arcgisonline.com/ArcGIS/rest/services/NatGeo_World_Map/MapServer"
										 visible="{bb.selectedIndex == 4}"/>
	</esri:Map>
	<s:ButtonBar id="bb"
				 right="5" top="5" fontFamily="宋体" fontSize="16" fontWeight="bold" color="#00A600" 
				 requireSelection="true">
		<s:dataProvider>
			<s:ArrayList>
				<fx:String>街道</fx:String>
				<fx:String>地形图</fx:String>
				<fx:String>影像图</fx:String>
				<fx:String>海洋图</fx:String>
				<fx:String>国家地理</fx:String>
			</s:ArrayList>
		</s:dataProvider>
	</s:ButtonBar>
</s:Application>