Archive for November, 2009

Which Storage Devices Are Considered Removable?

AIR 2 has the ability to detect the mounting and un-mounting of storage volumes like flash drives, hard drives, some types of digital cameras, etc. (to see this in action, see A Demonstration of the New Storage Volume APIs in AIR 2). This feature basically piggybacks off of the operating system’s detection of storage devices. In other words, if the OS thinks something is a mass storage device, AIR will also recognize it as such and throw a StorageVolumeChangeEvent. If the OS does not recognize the device as a storage volume, AIR will not react to it. (Note: it is possible to detect and communicate with any type of peripheral in AIR 2 using external processes launched with the new NativeProcess API; the StorageVolume APIs are only for, well, storage volumes.)

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Demonstration of Gesture APIs in AIR 2

I don’t have a multi-touch computer (yet), but I do have a MacBook with a multi-touch trackpad which means I can write AIR 2 applications that incorporate gestures. The video below demonstrates a few of the new gesture APIs in AIR 2:

The code below shows how to indicate that you want to receive gesture events (as opposed to multi-touch, or no touch events at all), and registers for zoom, rotate, and pan gesture events (the watch variable refers to a Sprite which contains the bitmap image of the watch):

Multitouch.inputMode = MultitouchInputMode.GESTURE;
watch.addEventListener(TransformGestureEvent.GESTURE_ZOOM, onZoom);
watch.addEventListener(TransformGestureEvent.GESTURE_ROTATE, onRotate);
watch.addEventListener(TransformGestureEvent.GESTURE_PAN, onPan);

The three functions below show responding to each of the gesture events:

private function onZoom(e:TransformGestureEvent):void
var watch:Sprite = as Sprite;
watch.scaleX *= e.scaleX;
watch.scaleY *= e.scaleY;

private function onRotate(e:TransformGestureEvent):void
var watch:Sprite = as Sprite;
watch.rotation += e.rotation;

private function onPan(e:TransformGestureEvent):void
var watch:Sprite = as Sprite;
var watchBitmap:Bitmap = watch.getChildAt(0) as Bitmap;
watchBitmap.x += e.offsetX;
watchBitmap.y += e.offsetY;

For much more information on how multi-touch and gestures work in both AIR 2 and Flash Player 10.1 (including OS and hardware support, which gestures are supported where, and a thorough review of the APIs), and to download sample code, see Multi-touch and Gesture Support on the Flash Platform. Or, if you just want to see the code for this sample, you can download it here.

AIR 2 Public Beta Resources

The AIR 2 public beta is now live! Below are all the links you’ll need to learn more and get started:

Adobe Labs

Adobe Developer Center

Adobe TV

This Blog


A Demonstration of Encrypted Socket Support in AIR 2

I’ve been wanting to write my own email notifier in AIR for a long time, but without support for encrypted sockets, it wasn’t easy to do. But now that AIR 2 added the new SecureSocket class, I was able to write a pretty functional email notifier in just a couple of days:

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A Demonstration of the NativeProcess APIs in AIR 2

SearchCentral uses the new NativeProcess APIs in AIR 2 in order to integrate with Spotlight and provide very fast local file system search. Here’s a demo:

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A Demonstration of the New Storage Volume APIs in AIR 2

Below is a screencast of an application I wrote called FileTile in order to validate the new storage volume APIs in AIR 2:

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A Demonstration of the ServerSocket API in AIR 2

In order to validate the new ServerSocket APIs in AIR 2, I wrote an application called HTTPeek. HTTPeek is a proxy server that sits between your browser and the network, and can show you HTTP request and response headers. It can handle compressed content, chunked content, binary content, etc. Check out the video below to see it in action:

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Some Interesting AIR Marketplace Statistics

A little over a year ago, I wrote a Python script to screen scrape the entire Adobe AIR Marketplace, download all the listed AIR applications, crack open the installers, and extract some statistics. My primary interest was how many HTML-based AIR applications were listed versus SWF-based applications, but I recorded some other interesting stats, as well.

I ran the script again the other day (after some updating since screen scraping scripts always break), and here’s what I found:

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