maincanvas.java

用J2ME写的一个益智类手机游戏。玩家回答问题

package mindsurf;

import javax.microedition.lcdui.*;
import com.nokia.mid.ui.FullCanvas;

/*main菜单界面*/
public class MainCanvas extends FullCanvas{
  Display display;
  private Image main[]=new Image[2];
  private int index=1;
  public MainCanvas(Display display) {
    this.display = display;
    try {
      main[0]=Image.createImage("/res/main.png");
      main[1]=Image.createImage("/res/shouzhi.png");
    }
    catch (Exception e) {}
  }

  protected void paint(Graphics g) {
   g.drawImage(main[0],0,0,Graphics.LEFT | Graphics.TOP);
   g.drawImage(main[1],20,28+index*15,Graphics.LEFT | Graphics.TOP);
 }

 protected void keyPressed(int keyCode){
     //按下的是数字键2
     if(keyCode == Canvas.KEY_NUM2){
       //判断是否移动到第一个选项
       if(index == 1){
         index = 4;
       }else{
         index--;
       }
     }
     //按下的是数字键8
     if(keyCode == Canvas.KEY_NUM8){
       //判断是否移动到第四个选项
       if(index == 4){
         index = 1;
       }else{
         index++;
       }
     }
     //重新绘制屏幕
     repaint();

     //如果按下数字键5
     if(keyCode == Canvas.KEY_NUM5){
       //根据选择的不同显示不同的界面
       switch(index){
         case 1:
                display.setCurrent(new StartCanvas(display));
                System.gc();
           break;
         case 2:
                display.setCurrent(new IntroCanvas(display));
                System.gc();
           break;
         case 3:display.setCurrent(new GaofenCanvas(display));

                System.gc();
           break;
         case 4:
           IqMIDlet.quitApp();
       }
     }
   }
}