centerstring.java

来自「《精通JAVA手机游戏与应用程序设计》随书光盘」· Java 代码 · 共 45 行

import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;


public class CenterString extends MIDlet implements CommandListener {

	private Command exitCommand;
	private CenterStringCanvas sg;

	public CenterString() {
		exitCommand = new Command("Exit", Command.EXIT, 1);
		sg = new CenterStringCanvas();
		sg.addCommand(exitCommand);
		sg.setCommandListener(this);
		Display.getDisplay(this).setCurrent(sg);
		
	}
	protected void startApp(){
	}

	protected void pauseApp() {
	}

	protected void destroyApp(boolean arg0){		
	}
	public void commandAction(Command c, Displayable d) {
		if (c == exitCommand) {			
			destroyApp(false);			
			notifyDestroyed();
		}
	}	
}

class CenterStringCanvas extends Canvas{
	
	protected void paint(Graphics g) {		
		g.drawString("Center String", this.getWidth()/2, this.getHeight()/2,
				Graphics.BOTTOM|Graphics.HCENTER);
	
	}
	
}