To add a Bing Maps tile layer, you need to first load the Bing Maps Javascript API libary into your application web page.
<script charset="UTF-8" type="text/javascript" src="http://ecn.dev.virtualearth.net/mapcontrol/mapcontrol.ashx?v=6.2"> </script>
Then in your application code, you need to create a MVBingTileLayer object, set your Bing Maps key and add the tile layer to the MVMapView instance.
baseMap = new MVBingTileLayer() ; baseMap.setKey("your_bing_maps_key") ; mapview.addMapTileLayer(baseMap);
Your application can also invoke the setMapType method to change the map type displayed by the map tile layer.
<a href="javascript:setMapType(MVBingTileLayer.TYPE_ROAD)">Road map <a href="javascript:setMapType(MVBingTileLayer.TYPE_HYBRID)">Hybrid map <a href="javascript:setMapType(MVBingTileLayer.TYPE_SHADED)">Shaded map <a href="javascript:setMapType(MVBingTileLayer.TYPE_SATELLITE)">Arial map
Please refer the API doc for more information on how to use the built-in Bing Maps tile layer class MVBingTileLayer.