Best practice for setting or detecting screen size?

Question

Hi All,
Trying to determine a best practice for setting or detecting the screen size. For playbook and iOS, I can set them. But for Android, the number of devices is too large so I'd rather detect. My first choice is to use the stage.stageHeight and stage.stageWidth. This works fine if I set my stage properties with standard meta data:
[SWF(height="320", width="480", frameRate="64", backgroundColor="#010101")]
However, if I use the application descriptor file to set the stage dimentions (as suggested by Christian Cantrell here http://www.adobe.com/devnet/flash/articles/authoring_for_multiple_screen_sizes.html)
<initialWindow>
<aspectRatio>landscape</aspectRatio>
<autoOrients>false</autoOrients>
<width>320</width>
<height>480</height>
<fullScreen>true</fullScreen>
</initialWindow>
Then the stage.stageHeight and stage.stageWidth are not the correct numbers when my main class is added to the stage. Sometime after the main class is added to the stage, then those numbers are fine. Is there an event I can wait for to know that the stage.stageHeight and stage.stageWidth are correct?
Thanks in advance!

Answer 1

Hi Lee,
Thanks for the quick response! However, for some reason the heightPercent & widthPercent metadata tags are not working as expected for me.
I have a wrapper class that I target for compiling, WagErgApplePhone.as where I've got my metadata
[SWF(heightPercent="100%", widthPercent="100%", frameRate="64", backgroundColor="#010101")]
sets some stage properties
stage.quality=StageQuality.LOW;
stage.scaleMode = StageScaleMode.NO_SCALE;
stage.align = StageAlign.TOP_LEFT;
and instantiates my main class
var main:Main = new Main();
addChild(main);
my main class constructor even waits for the stage
public function Main(){
if (stage) init();
else addEventListener(Event.ADDED_TO_STAGE, init);
in my init function, stage.stageHeight traces out as 375 (expecting 320).
i have a function which is called via a button press event by the user, and stage.stageHeight traces out correctly (320) there. that's what makes me think that if i wait long enough, i can get the correct stageHeight before init/drawing. but i'm not sure what event to listen for, or if there's another trick.
if i use Capabilities.screenResolutionX and Capabilities.screenResolutionY the correct values are provided for mobile, but these values are not useful for the desktop and web version of the app. if there's no other solution, i'll execute different code depending on platform.
again, for reference, my app descriptor:
<initialWindow>
<aspectRatio>landscape</aspectRatio>
<autoOrients>false</autoOrients>
<width>320</width>
<height>480</height>
<content>bin-iOS/WagErgApplePhone.swf</content>
<title>WAG ERG</title>
<fullScreen>true</fullScreen>
<renderMode>cpu</renderMode>
</initialWindow>
looking forward to any other ideas to try out & thanks so much for your thoughts! if you want to really dig in, this is an opensource project at code.google.com/p/wag-erg/