Here is a class that scales to fit all devices. In the 'resizeHandler' method, you can use 'stage.stageWidth' or 'stage.stageHeight' to calculate proper scaling according to the device screen size.

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package  {
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import flash.display.MovieClip;
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import flash.events.Event;
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import flash.display.StageAlign; //for air android resizing
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import flash.display.StageScaleMode; //for air android resizing
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import flash.system.Capabilities; //used to get screen dimensions
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public class fusion0 extends MovieClip {
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	public function fusion0() {
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		// constructor code
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		stage.scaleMode = StageScaleMode.NO_SCALE;//for air android resizing
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		stage.align = StageAlign.TOP_LEFT;//for air android resizing
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		stage.addEventListener(Event.RESIZE, resizeHandler);//for air android resizing
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		stage.dispatchEvent(new Event(Event.RESIZE));//for air android resizing
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		}
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function resizeHandler(event:Event=null):void
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		{
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		/* scale code ... */
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		}
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	}
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}