DemoApplication.java

package iphonedemo;

import org.xmlvm.iphone.CGRect;
import org.xmlvm.iphone.UIApplication;
import org.xmlvm.iphone.UILabel;
import org.xmlvm.iphone.UIScreen;
import org.xmlvm.iphone.UITextAlignment;
import org.xmlvm.iphone.UIView;
import org.xmlvm.iphone.UIWindow;

/**
 *
 * @author avh4
 */
public class DemoApplication extends UIApplication {

    @Override
    public void applicationDidFinishLaunching(UIApplication arg0) {
        UIScreen screen = UIScreen.mainScreen();
        CGRect rect = screen.getApplicationFrame();
        UIWindow window = new UIWindow(rect);

        rect.origin.x = rect.origin.y = 0;
        UIView mainView = new UIView(rect);
        window.addSubview(mainView);

        UILabel title = new UILabel(rect);
        title.setText("Hello World!");
        title.setTextAlignment(UITextAlignment.Center);
        mainView.addSubview(title);

        window.makeKeyAndVisible();

    }
}

Main.java

package iphonedemo;

import org.xmlvm.iphone.UIApplication;

/**
 *
 * @author avh4
 */
public class Main {

    public static void main(String args[])
    {
        UIApplication.main(args, DemoApplication.class);
    }

}

Painter.java

package iphonedemo;

import java.util.Set;
import org.xmlvm.iphone.CGContext;
import org.xmlvm.iphone.CGRect;
import org.xmlvm.iphone.UITouch;
import org.xmlvm.iphone.UIView;

/**
 *
 * @author avh4
 */
public class Painter extends UIView {

    public Painter(CGRect windowRect) {
        super(windowRect);
    }

    boolean color = false;

    @Override
    public void drawRect(CGRect rect) {
        float black[] = { 0, 0, 0, 1 };
        float blue[] = { 0, 0, 1, 1 };
        CGContext g = CGContext.UICurrentContext();
        if (color)
        {
            g.setFillColor(blue);
        }
        else
        {
            g.setFillColor(black);
        }
        g.fillRect(rect);
    }

    @Override
    public boolean touchedInsideView(Set<UITouch> touches) {
        color = !color;
        setNeedsDisplay();
        return super.touchedInsideView(touches);
    }

}