does flex support Portrait or landscape orientation in Flex Mobile Development

You can use resize event of the view or group of 100% size of application.

<s:View xmlns:fx="http://ns.adobe.com/mxml/2009"

         xmlns:s="library://ns.adobe.com/flex/spark"

         xmlns:mx="library://ns.adobe.com/flex/mx"

         resize="view1_resizeHandler(event)">

          protected function view1_resizeHandler(event:ResizeEvent):void

            {

                    if (getOrientationUniversal() == "portrait")

                    {   

                        changeToPortrair();

                    }

                    else

                    {

                        changeToLandscape();

                    }

             }

            public function getOrientationUniversal():String

            {

                //portrait

                if (height > width)

                    return "portrait";

                else

                    return "landscape";

            }