choicelist.java

手机版的旅游信息系统

package com.wy.ch16;

import java.util.*;

import javax.microedition.lcdui.*;
public class ChoiceList extends MemoryList implements CommandListener {
    private Vector travelInfo;
    private Command OKCommand;
    private Command QuitCommand;
    private Command BackCommand;
    public ChoiceList(Displayable l,Vector i) {
        super("请选择", l);
        travelInfo=i;
        QuitCommand = new Command("退出", Command.EXIT, 1);
        BackCommand = new Command("后退", Command.BACK, 2);
        this.addCommand(QuitCommand);
        this.addCommand(BackCommand);
        if ((travelInfo == null) || (travelInfo.size() == 0)) {
            this.setTitle("没有相关的旅游信息");
        } else {
            for (int j = 0; j <travelInfo.size(); j++) {
                TravelInfo travelinfo=(TravelInfo)travelInfo.elementAt(j);
                StringBuffer info = new StringBuffer();
                info.append("公司：");
                info.append(travelinfo.getAgency());
                info.append(" 时间：");
                info.append(travelinfo.getTime());
                info.append(" 价格：");
                info.append(travelinfo.getPrice());
                this.append(info.toString(), null);
            } //for
            OKCommand = new Command("确定", Command.OK, 1);
            this.addCommand(OKCommand);
        } //else
        this.setCommandListener(this);
    }
    
    public void commandAction(Command command, Displayable displayable) {
        if (command == QuitCommand) {
            MainMIDlet.getInstance().notifyDestroyed();
        }
        if (command == BackCommand) {
            Display.getDisplay(MainMIDlet.getInstance()).setCurrent(
                    getDisplayable());
        }
        if (command == OKCommand) {
            int selected = getSelectedIndex();
            String id=((TravelInfo)travelInfo.elementAt(selected)).getId();
            Display.getDisplay(MainMIDlet.getInstance()).setCurrent(new CardList(id, this));
        }
    }
    
}