midp1eventstand_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 MIDP1EventStand_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;

  //声明一个代表按键信息的变量
  String text = "MIDP1.0标准按键测试";

  MIDP1EventStand_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(text, 0, height / 2, Graphics.LEFT | Graphics.TOP);
  }

  /*
   4.响应按键事件
   */
  protected void keyPressed(int keyCode) {
    switch (keyCode) {
      case KEY_NUM0:
        text = "您点击了数字键0！";
        break;
      case KEY_NUM1:
        text = "您点击了数字键1！";
        break;
      case KEY_NUM2:
        text = "您点击了数字键2！";
        break;
      case KEY_NUM3:
        text = "您点击了数字键3！";
        break;
      case KEY_NUM4:
        text = "您点击了数字键4！";
        break;
      case KEY_NUM5:
        text = "您点击了数字键5！";
        break;
      case KEY_NUM6:
        text = "您点击了数字键6！";
        break;
      case KEY_NUM7:
        text = "您点击了数字键7！";
        break;
      case KEY_NUM8:
        text = "您点击了数字键8！";
        break;
      case KEY_NUM9:
        text = "您点击了发射键9！";
        break;
      case KEY_STAR:
        text = "您点击了星号键！";
        break;
      case KEY_POUND:
        text = "您点击了井号键！";
        break;
    }
    repaint();
  }
}