自定义Flex的Loading界面

首先~自定义Flex加载的原理其实就是继承mx.preloaders.DownloadProgressBar类..然后重写相关的方法..
package
{
import flash.display.*;
import flash.events.*;
import flash.net.*;
import flash.text.TextField;
import flash.text.TextFormat;
import mx.events.FlexEvent;
import mx.preloaders.DownloadProgressBar;
public class LoadingExampleProgressBar extends DownloadProgressBar
{
private var logo:Loader;
private var txt:TextField;
private var _preloader:Sprite;
public function LoadingExampleProgressBar()
{
logo = new Loader();
logo.load(new URLRequest("l4cd.png"));
addChild(logo);
var style:TextFormat = new TextFormat(null,null,0xFFFFFF,null,null,null,null,null,"center");
txt = new TextField();
txt.defaultTextFormat = style;
txt.width = 200;
txt.selectable = false;
txt.height = 20;
addChild(txt);
super();
}
//最重要的代码就在这里..重写preloader,让swf执行加载的时候~进行你希望的操作~
override public function set preloader(value:Sprite):void
{
_preloader = value
//四个侦听~分别是 加载进度 / 加载完毕 / 初始化进度 / 初始化完毕
_preloader.addEventListener(ProgressEvent.PROGRESS,load_progress);
_preloader.addEventListener(Event.COMPLETE,load_complete);
_preloader.addEventListener(FlexEvent.INIT_PROGRESS,init_progress);
_preloader.addEventListener(FlexEvent.INIT_COMPLETE,init_complete);
stage.addEventListener(Event.RESIZE,resize)
resize(null);
}
private function remove():void{
_preloader.removeEventListener(ProgressEvent.PROGRESS,load_progress);
_preloader.removeEventListener(Event.COMPLETE,load_compl