Android PhotosLoader in Scala

PhotosLoader1.scala

import scala.actor._

class PhotosLoader extends Actor {
	
	override def act() {
		loop {
			react {
				case photoToLoad:PhotoToLoad => 
						val bmp = getBitmap(photoToLoad.url)
						if(bmp != null) {
							cache.put(photoToLoad.url, bmp)
						}
						
						val expectedURL = photoToLoad.imageView.getTag.asInstanceOf[String]
						
						if (expectedURL.equals(photoToLoad.url)) {
							photoToLoad.bitmap = bmp;
							val a = photoToLoad.imageView.getContext().asInstanceOf[Activity]
							a.runOnUiThread(photoToLoad)
						}
					}
				}
			}
		}
	}
}