gistfile1.java

public interface ICallback<T> {
		public onComplete(Bitmap b);
		public onError();
	}

interface IRemoteBitmapService {
	

	public void <T> getBitmap(String url, ICallback<T> cbk);
}

...in Activity, assume mhandler and mImageView are members

mService.getBitmap("lemonparty.org/ifailatlife.png",new ICallback() {
	public onComplete(Bitmap bmp, Handler h) {
		mHandler.postRunnable(new Runnable() {
		mImageView.setBitmapDrawable(bmp);
	}
	public onError() {
		dosomething
	}
});