You already know that you can use Flex 4.5 and Flash Builder 4.5 to build applications for Android and BlackBerry Tablet OS devices. Today we’re releasing an update to Flash Builder that will enable the exact same workflow to build iOS apps. You’ve probably see us demo this a million times already but today it’s here for you to start building your applications!

In this video I’m showing you have easy it is to do this and where to get all the developer and device certificates from.

The coolest thing is that you can now use the exact same code to build apps for Android, BlackBerry Tablet OS and iOS devices in one go! When you’re app is ready you only need to press the release build button to package your application for all these platforms.

“But my application won’t look native, Serge“. Well… I kinda like that. Flex gives you the freedom to make your application look however you want. But if you really need that native iOS feel then check out this Flex theme.

Want to find out more about Flash Builder 4.5? Then don’t forget to sign up for our Developer Week. It starts today and tomorrow I’ll be talking about mobile application development using Flex and Flash Builder 4.5.1.

If you already have Flash Builder 4.5 then go to the HELP menu and select SEARCH FOR FLASH BUILDER UPDATES to download the 4.5.1 update. If you haven’t upgraded to Flash Builder 4.5 yet then try it for 60 days. I guarantee you’ll love it. Oh… And yes… The iOS workflow also works on Windows!

I’m sure you all know that Flash Builder will enable you to build applications with Flex and/or ActionScript and then compile them for distribution on the Android Market. An upcoming version of Flash Builder will also enable the same workflow for iOS and BlackBerry Tablet OS applications. You’ll even be able to package these different types of installers in one go.

One of the many exciting new features in AIR 2 is the ability to create native installers. That gives your AIR 2 application the ability to talk to native code. In this video I’ll show you how to build native installers for Adobe AIR 2 using the command line, and I also explore how my Package Assistant app simplifies that process. The Package Assistant that I’m using in the video is an older version and I think you’ll find that the current version is even easier to use.

The states model has changed quite a bit in the Flex 4 framework but it’s a lot easier to use. In this video I show you just how easy it is to add different states and to add different behaviors and change properties based on the current state.

Also available on Adobe TV.

Last Friday I blogged about how HTML5 and Flash could also just work together. A few people have asked if they could get the source files. I just packaged and uploaded the FLA, ActionScript class and HTML files. Download the zip file here.

A few people have also noted that the demo doesn’t work across different platforms even when using the same browser. While I wanted to demonstrate how Flash and HTML5 can coexist and even complement each other, it is (sadly) also a demonstration on how HTML5 is being implemented differently across browsers and operating systems. Feel free to post a comment if you know about fixes or workarounds in the JavaScript to make it work on more browsers.