KlugDeviceType

<extensions>
    <extensionID>com.klug.devicetype</extensionID>
</extensions>

import com.klug.devicetype.DeviceType;

var type:DeviceType = DeviceType.getInstance();

// the same answer in portrait and landscape, available before the first layout
if ( !type.isSupported )     useDesktopLayout();   // other platforms: deviceType is ""
else if ( type.isTablet )   useTabletLayout();    // Android: 600 dp or more · iOS: iPad
else                        usePhoneLayout();

// dp on Android, points on iOS; -1 where not available
var sw:int = type.smallestWidthDp;
var columns:int;

if ( sw >= 720 )        columns = 3;   // large tablet
else if ( sw >= 600 )   columns = 2;   // small tablet
else                    columns = 1;   // phone, or -1: not available

buildGrid( columns );

import flash.events.Event;

var current:String = type.deviceType;

// every read asks the system again, nothing is cached
stage.addEventListener( Event.RESIZE, function( e:Event ):void {
    var now:String = type.deviceType;
    if ( now == current ) return;   // a rotation alone never changes it
    current = now;
    rebuildLayout( now );            // Android: opening a foldable can turn "phone" into "tablet"
});

// iOS: isTablet follows the device (iPad) and does not change;
// smallestWidthDp follows the screen the app is shown on