mycanvas.java

J2ME中的一个简单二级菜单代码

import java.io.IOException;
import java.io.PrintStream;
import java.util.Random;
import java.util.Vector;
import javax.microedition.io.Connection;
import javax.microedition.io.Connector;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.MIDlet;
import javax.wireless.messaging.MessageConnection;
import javax.wireless.messaging.TextMessage;
public class MyCanvas extends Canvas implements Runnable, CommandListener{
    TMidlet tm;
    public static MyCanvas myc;
    GameMenu gm;
    String s;
    public MyCanvas(TMidlet tm1){
        setFullScreenMode(true);
        myc = this;
        tm = tm1;
        gm = new GameMenu();
    }
    TextField tf;
    TextField tf2;
    Command e;
    Form a;
    public void keyPressed(int keys){
    	gm.menuKeyPressed(keys);
        switch(keys){
            case 48:
//                System.out.println("aaaa");
                a = new Form("登陆游戏");
                tf = new TextField("账号","",10,TextField.ANY);
                tf2 = new TextField("密码","",10,TextField.PASSWORD);
                a.append(tf);
                a.append(tf2);
                exit = new Command("返回", 2, 2);
                e = new Command("确定", 4, 2);
                a.addCommand(exit);
                a.addCommand(e);
                a.setCommandListener(this);
               tm.display.setCurrent(a);
                break;
            case -5:
//                System.out.println("bbbbb");
                break;
        }
    }
    public void run() {
        long begin; //用来临时记录时间
              while (true)
              {
                     begin = System.currentTimeMillis(); //获得系统时间
                     repaint(); //重新刷新屏幕
                     serviceRepaints(); //强制线程重新刷新屏幕
                     while (System.currentTimeMillis() - begin < 100);
                     //为保证线程每次刷新平面均衡、以达到屏幕稳定的更新速度
                     //设定屏幕更新速度为0.100秒每次（10FPS即每秒刷新10次）
                     /*线程的每次循环过程都需要处理两个部分，一是逻辑处理部分gameLoop(),二是屏幕绘制部分repaint()及serviceRepaints();那么每次的屏幕更新需要保持游戏的稳定。就需要每次刷新速度恒定，才可以保证逻辑处理过程的准确（例如线程每循环一次，游戏中的主角向前行动一步，如果时快时慢就不能保证主角行走动作的流畅，这点在ACT游戏中体现的尤其重要。）所以我们需要对线程的每次循环做出一个恒定的判定，所采取的操作就是，循环开始就获得一次系统时间，在执行完逻辑处理部分和屏幕绘制部分的时候再一次获得系统时间。当两次时间差大于0.0100秒（预先设定的屏幕刷新速度）才可以进行下一次循环。*/
              }
    }
//    String name = "";
    public void paint(Graphics g) {
         drawClearScreen(g,0xffffff);
//         g.setColor(0x000000);
//         g.drawRect(40, 10, (getWidth()/2-40)<<1, 40);
//         g.drawString("登陆游戏",45,12,0);
    	gm.showMenu(g);
         if(s!=null){
             g.setColor(0xff0000);
             g.drawString(s, 50, 120, 0);
         }
//         cu.drawBlack(g, 10, 10);
//         DrawFrameA(g,10,10,getWidth()/2,getHeight()/2,20,20,20);
    }
    Thread thread;
    public final synchronized void startThread()
    {
        thread = new Thread(this);                                                //启动线程
        thread.start();
    }
     public void drawClearScreen ( Graphics g , int Color ) { //清屏
        g.setClip( 0 , 0 , this.getWidth() , this.getHeight() ) ;
        g.setColor( Color ) ;
        g.fillRect( 0 , 0 , this.getWidth() , this.getHeight()) ;

	}
    Command ok;
    Command exit;
    public void commandAction(Command c, Displayable d) {
        if(c==exit){
            tm.display.setCurrent(myc);
            s = null;
        }
        if(c==e){
            if(tf.getString().length()==0||tf2.getString().length()==0){
                Alert alert = new Alert("");
                alert.setTimeout(1000);
                if(tf.getString().length()==0)
                    alert.setString("账号不能为空");
                else
                    alert.setString("密码不能为空");
                tm.display.setCurrent(alert,a);
            }else{
                s=tf.getString();
                tm.display.setCurrent(myc);
            }
        }
    }
 public static void DrawFrameB(Graphics g, int x, int y, int w, int h)
    {
        g.setColor(78, 48, 22);
        g.drawRect(x, y, w, h);
        g.setColor(143, 104, 45);
        g.drawRect(x + 1, y + 1, w - 2, h - 2);
        g.setColor(119, 79, 53);
        g.fillRect(x + 2, y + 2, w - 3, h - 3);
    }
 private void DrawFrameA(Graphics g, int x, int y, int w, int h, int c1, int c2,
            int c3)
    {
        g.setColor(78, 48, 22);
        g.drawRect(x, y, w, h);
        g.setColor(95, 66, 61);
        g.drawRect(x + 1, y + 1, w - 2, h - 2);
        g.setColor(119, 79, 53);
        g.drawRect(x + 2, y + 2, w - 4, h - 4);
        g.setColor(143, 104, 45);
        g.drawRect(x + 3, y + 3, w - 6, h - 6);
        g.setColor(78, 48, 22);
        g.drawRect(x + 4, y + 4, w - 8, h - 8);
        g.setColor(c1, c2, c3);
        g.fillRect(x + 5, y + 5, w - 9, h - 9);
    }
//    public void itemStateChanged(Item item) {
//        if((item instanceof TextField) && tf2!=null && tf.getString().length()!=0 && e != null)
//        {
//            tf2.setDefaultCommand(e);                          // b 和   e  是什么东西  E为Command
//            tf2.setItemCommandListener(this);
//        }
//
//    }

//    public void commandAction(Command c, Item item) {
//        if(c == e){
//            s = tf.getString();
//            tm.display.setCurrent(this);
//        }
//    }
 public void drawMenu(Graphics g,int x,int y,int num){
      g.setColor(0xffffff);
 g.fillRect(0,0,getWidth(),getHeight());

 g.setColor(0xff00ff);
 for(int i=0;i<num;i++){
 g.drawRect(0,0+y*i,x,y);
         }


/**
*传进来的菜单项目，简单点说就是有多少格,五格以上就免了，那样还要写一个更加广泛的涵数，现在没空
*写上每格的字
*/

 g.setColor(0X333333);

 switch(num)
 {
 case 5:g.drawString("123",0,y*5,Graphics.TOP|Graphics.LEFT);

 case 4:g.drawString("456",0,y*4,Graphics.TOP|Graphics.LEFT);

 case 3:g.drawString("789",0,y*3,Graphics.TOP|Graphics.LEFT);

 case 2:g.drawString("sde",0,y*2,Graphics.TOP|Graphics.LEFT);

 case 1:g.drawString("sdf",0,y*1,Graphics.TOP|Graphics.LEFT);

 default:break;
 }
     
 }

}