flex 监听网络连接情况

 NativeApplication.nativeApplication.addEventListener(Event.NETWORK_CHANGE, onNetworkChange);
 private var monitor:URLMonitor;
             public var urlStr:String;
             public function onNetworkChange(event:Event):void
             {
                 trace("网络连接发生改变");
                 //监视网络状态
                 var url:URLRequest=new URLRequest(urlStr);
                 url.method = "GET";
                 monitor = new URLMonitor(url);
                 monitor.addEventListener(StatusEvent.STATUS, onMonitor);
                 monitor.start();
             }
             private function onMonitor(event:Event):void
             {
                 monitor.removeEventListener(StatusEvent.STATUS, onMonitor);
                 trace("连接"+monitor.available);
                 if(monitor.available){
                     //网络连接可用
                     //处理联网操作
                     setDataHandler();
                     papersViewId.initVu();
                     dispatchEvent(new NetOkEvent(NetOkEvent.NETOK_EVENT));
                 }
                 else
                 {
                     //网络连接不可用，相关处理
                     dispatchEvent(new NetErrorEvent(NetErrorEvent.NETERROR_EVENT));
                 }
             }