Getting Mobile Device (Correct) Screen Size

Question

I have some confusion over getting the screen size of a mobile device. I measured the following:
var hsa:AlertObject = new AlertObject();
hsa.alertMessage = "screen w:" +  this.stage.fullScreenWidth + "  h:" + this.stage.fullScreenHeight + "\n" +
                    "capscreen w: " + capmc.width + " h:" + capmc.height + "\n" +                    
                    "capabilites w: " + Capabilities.screenResolutionX + " h: " + Capabilities.screenResolutionY;
hsa.open(this, false);
I ran this on an iPod touch 4 which has a resolution of 960 X 640. The above code gives me:
screen = 480 X 320
capscreen (a movie clip I load that is scaled to the full screen and is displaying properly) = 1548.85 X 677 (I presume the original dimensions my designer gave the SWF).
Capabilities = 480 X 320
Note that 480 X 320 is precisely half of the actual screen dimensions of an iPod Touch 4. Can someone please tell me why. And, given that capscreen is displaying (properly) at the time I take these measurements and display results, why is capscreen reporting larger than the actual dimensions of the device? Also, my app orrientation is landscape only and yet the dimensions I'm getting are that width is < height which means the device is reporting in portrait mode.
If I just need to check for iOS and then double dimensions, that's fine. But, I don't want to do that for this iPod Touch test to find it works differently on other iOS devices.
I know that all of my screens are on the stage, BTW. I know this because I get the AlertObject to show me alerts by pressing one of the buttons of a loaded screen I am measuring - and the button is not enabled until all SWF's are finished loading and being added to stage.

Answer 1

<?xml version="1.0" encoding="utf-8"?>
<s:View xmlns:fx="http://ns.adobe.com/mxml/2009"
        xmlns:s="library://ns.adobe.com/flex/spark" title="NewCappoCamera" actionBarVisible="false" xmlns:mx="library://ns.adobe.com/flex/mx">
    <fx:Declarations>
        <!-- Place non-visual elements (e.g., services, value objects) here -->
    </fx:Declarations>
    <fx:Script>
        <![CDATA[
private function loadSWF():void {
pictureButtons.load();
pictureButtons.content.addEventListener(Event.ADDED, loadComplete);
//initCamera();
private var mc:MovieClip;
private var hasBeenInit:Boolean = false;
private function loadComplete(event:Event):void{
event.target.removeEventListener(Event.ADDED, loadComplete);
if(event.target is MovieClip && mc == null) {
mc = MovieClip(event.target);
mc.play();
if(event.target.name == "acceptPicBtn") {
acceptButton = SimpleButton(event.target);
acceptButton.enabled = false;
else if(event.target.name == "retakePicBtn") {
retakeButton = SimpleButton(event.target);
retakeButton.addEventListener(MouseEvent.CLICK, retakeClicked);
retakeButton.enabled = false;
else if(event.target.name == "takePicBtn") {
cameraButton = SimpleButton(event.target);
cameraButton.addEventListener(MouseEvent.CLICK, cameraButtonPressed);
if(cameraButton != null && acceptButton != null
&& retakeButton != null && cameraButton != null && mc != null && !hasBeenInit) {
mc.stop();
pictureButtons.endEffectsStarted();
hasBeenInit = true;
initCamera();
//private var numTimes:uint = 0;
private function initCamera():void {
cameraButton.visible = true;
cameraButton.enabled = true;
acceptButton.enabled = false;
retakeButton.enabled = false;
acceptButton.visible = false;
retakeButton.visible = false;
//front camera loads if they have one and it's an iOS device.
var a:Array = Camera.names;
var camName:String = "";
var isAndroid:Boolean = false;
for(var i:uint = 0; i < a.length; i++) {
camName = a[i];
if(camName.indexOf("Front") != -1) {
break;
//test if android as right now only the back camera
///works on that platform.
if(Capabilities.version.indexOf('AND') != -1) {
this.camera = Camera.getCamera();
isAndroid = true;
else if(camName.indexOf("Front") != -1 &&
!isAndroid) {
this.camera = Camera.getCamera("1");
else {
this.camera = Camera.getCamera();
if(!Camera.isSupported) {
//todo
if(camera.muted) {
//todo
//following works on droid but is not working in iPod...
//camera.setMode(
//pictureButtons.contentWidth + this.width,
//pictureButtons.contentHeight + this.height, 30, true);
//the code below works on both platforms.
var ch:Number = Capabilities.screenResolutionY;
var cw:Number = Capabilities.screenResolutionX;
var vidh:Number = ch;
var vidw:Number = cw;
if(ch > cw) {
//in this case, the device must be registering in the portrait mode
//multiply eveything by 2 and switch orrientation...
vidw = ch * 2;
vidh = cw * 2;
camera.setMode(vidw, vidh, 30, false);
//android dimensions have to be doubled no matter what
else if(!(ch < cw) && isAndroid) {
vidw = cw * 2;
vidh = ch * 2;
camera.setMode(vidw, vidh, 30, false);
else {
//otherwise, everything should already be double and there's no need to switch
//width and height like there is above.
//need to test that this remains the case with ipod but can't seem to get ipod
//orientation to report other than "rotatedRight" no matter how the device is held.
camera.setMode(vidw, vidh, 30);
vidComponent.height = vidh;
vidComponent.width = vidw;
this.video = new Video();
video.width = vidComponent.width;
video.height = vidComponent.height;
video.attachCamera(camera);
vidComponent.addChild(video);
vidComponent.visible = true;
]]>
</fx:Script>
<mx:UIComponent id="vidComponent" x="0" y="0" width="100%" height="100%"/>
    <s:Image id="capturedImage" x="0" y="0"
             width="100%" height="100%"
             visible="false"/>
    <s:SWFLoader
        id="pictureButtons"
        x="0" y="0"
        width="100%" height="100%"
        scaleContent="true"
        source="@Embed('assets/SignUpPicButtons.swf')"
        creationComplete="{loadSWF()}" autoLoad="false"
        />   
    <s:SWFLoader
        id="busyLoader"
        x="0" y="0"
        width="100%" height="100%"
        scaleContent="true"
        source="@Embed('assets/CheckingSWF.swf')"
        autoLoad="false"
        />
    <s:SWFLoader
        id="invisibleBusy"
        x="0" y="0"
        width="100%" height="100%"
        scaleContent="true"
        source="@Embed('assets/InvCheckingSWF.swf')"
        autoLoad="false"
        />
</s:View>
Let me know if you want the SWF's required to run this code.