封装加载xml文件和图片的方法

封装加载xml文件和图片的方法，方便以后使用

注意：在加载时一定要进行错误处理

 1 /**
 2          * 加载xml文件
 3          * @param url
 4          * @param callback
 5          * protected function init(event:FlexEvent):void
 6             {
 7                 LoaderHelper.loadXML( "test.xml", onXMLLoaded );
 8             }
 9             
10             private function onXMLLoaded(xml:XML):void
11             {
12                 trace( xml.toString() );
13             }
14          * 
15          */        
16         public static function loadXML(url:String, callback:Function):void
17         {
18             var loader:URLLoader = new URLLoader();
19             loader.load( new URLRequest( url ) );
20             //处理加载错误
21             loader.addEventListener(IOErrorEvent.IO_ERROR, onError);
22             loader.addEventListener(Event.COMPLETE, function(event:Event):void{
23                 callback( new XML( loader.data ) );
24             } );
25         }
26         
27         /**
28          * 加载图片
29          * @param url
30          * @param callback
31          * 
32          * protected function init(event:FlexEvent):void
33             {
34                 LoaderHelper.loadImage( "test.png", onImageLoaded );
35             }
36             
37             private function onXMLLoaded(xml:XML):void
38             {
39                 trace( xml.toString() );
40             }
41          */        
42         public static function loadImage(url:String, callback:Function):void
43         {
44             var loader:Loader = new Loader();
45             loader.load( new URLRequest( url ) );
46             //处理加载错误
47             loader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, onError);
48             loader.contentLoaderInfo.addEventListener(Event.COMPLETE, function(event:Event):void{
49                 callback( Bitmap( loader.content ).bitmapData );
50             } );
51         }
52         
53         /**
54          * 加载错误
55          * @param event
56          * 
57          */        
58         protected static function onError(event:IOErrorEvent):void
59         {
60             trace(" urloader error....");
61 
62         }

使用方法

 1             protected function init(event:FlexEvent):void
 2             {
 3                 LoaderHelper.loadXML( "mySpritesheet.xml", onXMLLoaded );
 4                 LoaderHelper.loadImage( "mySpritesheet.png", onImageLoaded );
 5             }
 6             
 7             private function onXMLLoaded(xml:XML):void
 8             {
 9                 trace( xml.toString() );
10             }
11             
12             private function onImageLoaded(bd:BitmapData):void
13             {
14                 var image:Image = new Image();
15                 image.source = new Bitmap( bd );
16                 addChild( image );
17             }