keyeventscanvas.java

j2me的程序

import javax.microedition.lcdui.*;

public class KeyEventsCanvas
    extends Canvas {

  int width = 0;
  int height = 0;
  String aMessage = "[请按键]";

  public void paint(Graphics g) {
    width  = getWidth();
    height = getHeight();

    g.setGrayScale(255);
	g.fillRect(0,0,width-1,height-1);
	g.setGrayScale(0);
    g.drawRect(0,0,width-1,height-1);

    g.drawString(aMessage,10,10,Graphics.TOP|Graphics.LEFT);
  }

  protected void keyPressed(int keyCode){
	  aMessage = getKeyName(keyCode);
      if(aMessage.equals("2"))
        aMessage = "数字2已被按下";

	  repaint();
  }

}