Adobe Flex Supports the 4th of the known mobile Platforms.

Adobe announced that,

Adobe Flex applications are running on ,Android,IPhone,IPad and Blackberry Playbook by don't need to redevelopment.

http://blogs.adobe.com/flashplatform/2011/06/build-mobile-apps-for-android-devices-blackberry-playbook-iphone-and-ipad-today.html