electiveui.java

用J2ME写的一个移动校园管理软件。我是看这个学习J2ME的。现在看来写得不是很好。

/*
 * ElectiveList.java
 *
 * Created on 2006年8月29日, 下午4:21
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package cn.edu.nwpu.MobileCampusClinet;
import cn.edu.nwpu.MobileCampusServer.ElectiveBean;
import java.util.Vector;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.MIDlet;

/**
 *
 * @author NickJava
 */
public class ElectiveUI extends List implements CommandListener{
    //可选修的选修课数组
    private Vector electiveArray;
    //用户选择的数组
    private boolean[] selectedArray;
    //用户选择的选修课名
    private String[] hasChoice;
    //查看选修课的详细信息的Form
    private Form showElective;
    //显示用户选择的选修课确认的Form
    private Form ensureInfo;
    //用户的ID
    private String userName;
    private Command seeCommand;
    private Command OKCommand;
    private Command backCommand;
    private MIDlet midlet;
    private Display display;
    private Displayable displayable;
    private GaugeObserverUI gaugeObserverUI;
    /** Creates a new instance of ElectiveList */
    public ElectiveUI(MIDlet midlet,Displayable displayable , Vector electiveArray , String userName){
        super("选修课列表", Choice.MULTIPLE);
        this.electiveArray=electiveArray;
        selectedArray=new boolean[electiveArray.size()];
        hasChoice=new String[5];
        showElective = new Form("选修课信息");
        ensureInfo = new Form("确认信息");
        OKCommand = new Command("确定",Command.OK , 5);
        backCommand = new Command("返回",Command.BACK,5);
        seeCommand = new Command("查看",Command.BACK,5);
        this.userName=userName;
        this.midlet=midlet;
        this.display=Display.getDisplay(midlet);
        this.displayable=displayable;
        gaugeObserverUI = new GaugeObserverUI();
        appendElective();
        addCommand(seeCommand);
        addCommand(OKCommand);
        setCommandListener(this);
    }
    //向屏幕添加选修课的名称
    public void appendElective(){
        for(int i=0 ; i<electiveArray.size();i++){
            ElectiveBean electiveName = (ElectiveBean) electiveArray.elementAt(i);
            append(electiveName.getElectiveName(),null);
        }
    }
    public void gaugeRun(Thread thread , String title , boolean stop){
        gaugeObserverUI.init(title,stop);
        display.setCurrent(gaugeObserverUI);
        thread.start();
    }
    //显示错误
    private void showError(String message, Displayable d){
        Alert alert=new Alert("Error");
        alert.setType(AlertType.ERROR);
        alert.setTimeout(Alert.FOREVER);
        alert.setString(message);
        display.setCurrent(alert,d);
    }
    //查看用户选择得选修课信息
    public void getElectiveForm(){
        //清屏
        showElective.deleteAll();
        this.getSelectedFlags(selectedArray);
        for(int i=0 ; i<electiveArray.size() ; i++){
            if(selectedArray[i]==true){
                ElectiveBean elective=(ElectiveBean)electiveArray.elementAt(i);
                showElective.append( new StringItem(elective.getElectiveName(), " \r\n总人数 :"+elective.getTotalNum()
                +" \r\n当前人数 :"+elective.getCurrentNum()
                +" \r\n上课地点 :"+elective.getPlace()
                +" \r\n时间 :"+elective.getTime()
                +" \r\n任课教师 :"+elective.getTeacher()));
            }
        }
        showElective.addCommand(backCommand);
        showElective.setCommandListener(this);
    }
    //让用户确认自己所选修的课程
    public void getEnsureInfo(){
        //清屏
        ensureInfo.deleteAll();
        this.getSelectedFlags(selectedArray);
        //用户可选修的选修课的数量
        int electiveNum=0;
        ensureInfo.append("用户ID :"+userName+" \r\n以下是您所选课程的详细清单 :");
        for(int i =0; i<electiveArray.size();i++){
            if(selectedArray[i]==true){
                ElectiveBean elective=(ElectiveBean)electiveArray.elementAt(i);
                if(electiveNum<5){
                hasChoice[electiveNum++]=elective.getElectiveName();
                 ensureInfo.append( new StringItem(elective.getElectiveName(), " \r\n总人数 :"+elective.getTotalNum()
                +" \r\n当前人数 :"+elective.getCurrentNum()
                +" \r\n上课地点 :"+elective.getPlace()
                +" \r\n时间 :"+elective.getTime()
                +" \r\n任课教师 :"+elective.getTeacher()));
                }
          }  
            
            ensureInfo.addCommand(OKCommand);
            ensureInfo.addCommand(backCommand);
            ensureInfo.setCommandListener(this);
        }
        
    }
    //开辟一个线程用于网络连接,处理选修课,如果操作成功向resultForm中添加成功信息
    public void addClass(final String username , final String[] electiveName){
        Thread thread = new Thread(){
            public void run(){
                try{
                    HTTPConnection hc=new HTTPConnection(gaugeObserverUI);
                    ResultForm resultForm = new ResultForm(midlet,displayable,electiveArray,userName);
                    for(int i=0 ; i<electiveName.length ; i++){
                        if(electiveName[i]!=null){
                            if(hc.addElective(username , electiveName[i])==true){
                                resultForm.append("\r\n");
                                resultForm.append(electiveName[i]+":操作成功");
                            }else{
                                resultForm.append("\r\n");
                                resultForm.append("\r\n"+electiveName[i]+":操作失败");
                            }
                        }
                    }
                    display.setCurrent(resultForm);
                    if(gaugeObserverUI!=null){
                        gaugeObserverUI=null;
                    }
                }catch(Exception e){
                    showError(e.getMessage(),ElectiveUI.this);
                }
            }
        };
        gaugeRun(thread,"正在进行数据同步",false);
    }
    //处理监听器
    public void commandAction(Command c,Displayable d){
        //当前屏幕
        if(d.equals(this)){
            if(c==seeCommand){
                getElectiveForm();
                display.setCurrent(showElective);
            }
            if(c==OKCommand){
                getEnsureInfo();
                display.setCurrent(ensureInfo);
            }
        }
        //查看屏幕
        if(d.equals(showElective)){
            if(c==backCommand){
                display.setCurrent(this);
            }
        }
        //确认屏幕
        if(d.equals(ensureInfo)){
            if(c==backCommand){
                display.setCurrent(this);
            }
            if(c==OKCommand){
                addClass(userName , hasChoice);
            }
            
        }
    }
    
}