locationform.java

手机版的旅游信息系统

package com.wy.ch16;

import javax.microedition.lcdui.*;
import java.util.*;

public class LocationForm extends Form implements CommandListener {
    private Command OKCommand;
    private Command QuitCommand;
    private TextField locationField;
    private DateField d;
    public LocationForm() {
        super("输入地点");
        locationField = new TextField("请输入地点", null, 10, TextField.ANY);
        d = new DateField("旅行开始日期", DateField.DATE);
        Date date=new Date();
        d.setDate(date);
        d.setLayout(Item.LAYOUT_CENTER);
        OKCommand = new Command("确定", Command.OK, 1);
        QuitCommand = new Command("退出", Command.EXIT, 1);
        this.append(locationField);
        this.append(d);
        this.addCommand(OKCommand);
        this.addCommand(QuitCommand);
        this.setCommandListener(this);
    }
    
    public void commandAction(Command command, Displayable displayable) {
        if (command == QuitCommand) {
            MainMIDlet.getInstance().notifyDestroyed();
        }
        if (command == OKCommand) {
            if (locationField.getString().equals("")) {
                Alert a = new Alert("错误");
                a.setType(AlertType.WARNING);
                a.setString("请输入目的地点");
                a.setTimeout(Alert.FOREVER);
                Display.getDisplay(MainMIDlet.getInstance()).setCurrent(a);
            } else {
                Alert a = new Alert("请等待");
                a.setType(AlertType.INFO);
                a.setString("正在联网，请稍候");
                a.setTimeout(Alert.FOREVER);
                Display.getDisplay(MainMIDlet.getInstance()).setCurrent(a);
                String location = locationField.getString();
                
                String date=d.getDate().toString();
                int index=0;
                int beginindex=0;
                int endindex=0;
                String year="";
                String month="";
                String day="";
                for(int i=0;i<date.length();i++){
                    if(date.charAt(i)==' '){
                        index++;
                        beginindex=endindex;
                        endindex=i;
                        if(index==2){
                            month=date.substring(beginindex+1,endindex);
                        }if(index==3){
                            day=date.substring(beginindex+1,endindex);
                        }
                    }
                    year=date.substring(endindex+1,date.length());
                }
                
                String months[]={"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"};
                for(int i=0;i<months.length;i++){
                    if(month.equals(months[i])){
                        month=new Integer(i+1).toString();
                        break;
                    }
                }
                
                if(day.startsWith("0")){
                    day=day.substring(1);
                }
                
                date=year+"-"+month+"-"+day;
                new QueryThread(location,date, this).start();
            }
        }
    }
}