midp1eventkeyname_canvas.java

本光盘是《J2ME无线移动游戏开发》一书的配套光盘

package ch04;

import javax.microedition.lcdui.*;

public class MIDP1EventKeyName_Canvas
    extends Canvas {

  //声明一个代表屏幕宽度的int型属性变量
  private int width;

  //声明一个代表屏幕高度的int型属性变量
  private int height;

  //声明一个代表按键名称的变量
  String text = "";

  //声明一个代表按键代码的变量
  String text1 = "";

  MIDP1EventKeyName_Canvas() {
    width = getWidth();
    height = getHeight();
    repaint();
  }

  /*
   3.实现paint()方法
   */
  protected void paint(Graphics g) {
    g.setColor(0xffffff);
    g.fillRect(0, 0, width, height);
    g.setColor(0x000000);
    g.drawString("您点击的按键名称是：" + text, 0, height / 3,
                 Graphics.LEFT | Graphics.TOP);
    g.drawString("您点击的按键代码是：" + text1, 0, height * 2 / 3,
                 Graphics.LEFT | Graphics.TOP);
  }

  /*
   4.响应按键事件
   */
  protected void keyPressed(int keyCode) {
    text = getKeyName(keyCode);
    text1 = new String().valueOf(getGameAction(keyCode));
    repaint();
  }
}