RuntimeDPIProvider  - AS3 Flex

<?xml version="1.0" encoding="utf-8"?>
<s:ViewNavigatorApplication xmlns:fx="http://ns.adobe.com/mxml/2009" 
        xmlns:s="library://ns.adobe.com/flex/spark"
        firstView="views.RuntimeDPIProviderAppView" 
        applicationDPI="160" runtimeDPIProvider="RuntimeDPIProviderExample" >
    <fx:Declarations>
        <!-- Place non-visual elements (e.g., services, value objects) here -->
    </fx:Declarations>
</s:ViewNavigatorApplication>

package
{
import flash.system.Capabilities;

import mx.core.DPIClassification;
import mx.core.RuntimeDPIProvider;

public class RuntimeDPIProviderExample extends RuntimeDPIProvider
{
    public function RuntimeDPIProviderExample()
    {
    }
    
    override public function get runtimeDPI():Number
    {
        // A tablet reporting an incorrect DPI of 240.
        if (Capabilities.screenDPI == 240 &&
            Capabilities.screenResolutionX == 600 &&
            Capabilities.screenResolutionY == 1024)
        {
            return DPIClassification.DPI_160;
        }
        
        return super.runtimeDPI;
    }
}
}