gameactioncanvas.java

j2me的程序

import javax.microedition.lcdui.*;

public class GameActionCanvas
    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){
    int gameAction = getGameAction(keyCode);
    switch(gameAction) {
      case UP:aMessage = "上";
              break;
      case DOWN:aMessage = "下";
                break;
      case LEFT:aMessage = "左";
                break;
      case RIGHT:aMessage = "右";
                 break;
      case FIRE:aMessage = "发送";
                break;
      case GAME_A: aMessage = "GAME_A";
                   break;
      case GAME_B: aMessage = "GAME_B";
                   break;
      case GAME_C: aMessage = "GAME_C";
                   break;
      case GAME_D: aMessage = "GAME_D";
                   break;
      default:aMessage = "";
              break;
    }
    repaint();
  }

}