helloworld2.java

J2ME MIDP 2.0 无线设备编程的一些源码

//HelloWorld2.java file
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;

public class HelloWorld2 extends MIDlet implements CommandListener
{

    private Command exitCommand;
    private HelloWorldCanvas myCanvas;
    public HelloWorld2()
    {
        exitCommand =new Command("Exit",Command.EXIT,1);
        myCanvas =new HelloWorldCanvas();
        myCanvas.addCommand(exitCommand);
        myCanvas.setCommandListener(this);
    }
    protected void startApp(  ) throws MIDletStateChangeException
    {
        Display.getDisplay(this).setCurrent(myCanvas);
    }

    protected void pauseApp(  )
    {
    }

    protected void destroyApp( boolean p1 )
    {
    }

    public void commandAction(Command c,Displayable d)
    {
        if (c ==exitCommand)
        {
            destroyApp(false);
            notifyDestroyed();
        }
    }
    //internal class HelloWorldCanvas
    public class HelloWorldCanvas extends Canvas
    {
        private String textShow="Hello,World2!";
        public HelloWorldCanvas() 
        {
        }
  
        public void paint(Graphics g) 
        {
            g.setColor(0xffffff);
            g.fillRect(0, 0, getWidth(), getHeight());
            g.setColor(0x000000);
            g.drawString(textShow,0,0,Graphics.TOP|Graphics.LEFT);
            g.drawString(textShow,0,20,Graphics.TOP|Graphics.LEFT);
        }
  
        protected  void keyPressed(int keyCode) 
        {
        }
      
        protected  void keyReleased(int keyCode) 
        {
        }
      
        protected  void keyRepeated(int keyCode) 
        {
        }
      
        protected  void pointerDragged(int x, int y) 
        {
        }
      
        protected  void pointerPressed(int x, int y) 
        {
        }
      
        protected  void pointerReleased(int x, int y) 
        {
        }
    }
}