adobe air - building applications with adobe air

<?xml version="1.0" encoding="utf-8"?>

<mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml"
 xmlns:compo="compo.*" layout="absolute" width="1024" height="768" styleName="parentApp" showStatusBar="false" creationComplete="{checkVersion();}">
 
     // ActionScript file
  import compo.*;
  import mx.states.RemoveChild;
  import mx.states.AddChild;
  import mx.controls.*;
  import mx.collections.*;
  import mx.events.*;
  import mx.rpc.*;
  import mx.rpc.events.ResultEvent;
  import mx.rpc.events.FaultEvent;
  
  import flash.filesystem.FileStream;
  import flash.filesystem.File;
  import flash.filesystem.FileMode;
  import flash.desktop.Updater;
  import mx.events.CloseEvent;
   
   private var urlString:String;
   private var urlReq:URLRequest;
   private var urlStream:URLStream = new URLStream();
   private var fileData:ByteArray = new ByteArray();
   
  
//  import mx.core.UIComponent;
//  import mx.core.IUIComponent;
//  import flash.events.Event;

  import scripts.global;
  public var mainTabs1:tabNav;
  
  private var latestVersion:Number;
  private var latestFileName:String;
  private var latestDetails:String;
  private var fromPref:Boolean = false;
  private var thisVersionNo:Number=1.09;

  public function invokeServer():void{
   var inputVars:Array = new Array();
   inputVars["userName"] = loginId.userName.text;
   inputVars["password"] = loginId.password.text;
   loginId.rmObject.concurrency;
   loginId.rmObject.phpAuthenticate(inputVars);
  }
  
  public function doValidationResult(result:ResultEvent):void{
   if(result.result.loginStatus=='1'){
    mainTabs1 = new tabNav();
    global.userId = result.result.userId;
    global.userName = result.result.userName;
    global.role  = result.result.role;
    global.email  = result.result.email;
    mainAppBox.removeAllChildren();
    mainAppBox.addChild(mainTabs1);
   }else{
    Alert.show('Invalid user name or password');
   }
  }
  
  public function goToError(fault:FaultEvent):void{ 
   Alert.show("Server - " + fault.fault.faultString, "Error" );
  }
  
  private function checkVersion():void{
   versionTest.send();
  }  
  // Check Results of HTTPService
  private function testVersion(event:ResultEvent):void{
   latestVersion = event.result.latestVersion;
   latestFileName = event.result.latestFileName;
   latestDetails = event.result.latestDetails;
    if(thisVersionNo < latestVersion){
    Alert.show("There is an update available, would you like to get it now?\n\nDetails:\n"+latestDetails, "New Update", 3, this, alertClickHandler);
    } else {
     mainAppBox.visible=true;
     mainAppBox.includeInLayout = true;
     if(fromPref){
      Alert.show("There are no new updates available", "Information");
     }
    }
  }

  private function alertClickHandler(event:CloseEvent):void {
         if (event.detail==Alert.YES){
             getUpdate();
             showProgress.visible = true;
             trace("getUpdate");
            } else{
             mainAppBox.visible=true;
     mainAppBox.includeInLayout = true;
            }
        }
       
     // Download the updated .air file
  private function getUpdate():void{
   urlString = "http://weburl.com/versions/;
    urlReq = new URLRequest(urlString);
    urlStream.addEventListener(Event.COMPLETE, loaded);
    urlStream.addEventListener(ProgressEvent.PROGRESS, progressHandler);
    urlStream.load(urlReq);
  }
  
  // Handle urlStream ProgressEvent
  private function progressHandler(event:ProgressEvent):void {
    trace("Download Progress "+(event.bytesLoaded*100)/event.bytesTotal+"%");
    downloadProgress.setProgress(event.bytesLoaded, event.bytesTotal)
  }
  
  // Handle urlStream COMPLETE Event and call writeAirFile()
  private function loaded(event:Event):void {
   urlStream.readBytes(fileData, 0, urlStream.bytesAvailable);
   trace("urlStream");
      writeAirFile();
  }
  
  // Write air file to disk and store in appStorageDirectory
  private function writeAirFile():void {
   var file:File = File.applicationStorageDirectory.resolvePath(latestFileName);
   var fileStream:FileStream = new FileStream();
      fileStream.addEventListener(Event.CLOSE, fileClosed);
      fileStream.openAsync(file, FileMode.WRITE);
      fileStream.writeBytes(fileData, 0, fileData.length);
   fileStream.close();
  }
  
  // Handle CLOSE Event when file write has completed and call update to update application install
  private function fileClosed(event:Event):void {
   trace("fileClosed");
   Alert.show("Update is Downloaded and ready to Install.You can Install now .\n\nNote:\nInstallation will automatically restart the application.", "Install Update", 3, this, alertInstallHandler);  
   showProgress.visible = false;
  }
  
  private function alertInstallHandler(event:CloseEvent):void {
      if (event.detail==Alert.YES){
          var updater:Updater = new Updater();
          var airFile:File = File.applicationStorageDirectory.resolvePath(latestFileName);
     var version:String = String(latestVersion);
    updater.update(airFile, version);
         }else{
          this.parentApplication.updateFileAvailable = true;
         }
  }
  private function stopDown():void {
  // Alert.show("This will stop downloading update. You won't be able to resume.\nYou can later update the application from 'Preferences'.", "Stop Update", 3, this, alertStopDownHandler);    
  }

 Here is the version.xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<latestVersion>1.09</latestVersion>
<latestFileName>authorManLive.air</latestFileName>
<latestDetails>Updates from the admin. Password field changed for testing.</latestDetails>