recordlist.java

本光盘是《J2ME无线移动游戏开发》一书的配套光盘

package ch12;

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

class RecordList
    extends List
    implements CommandListener {
  //声明一个Display对象
  private Display aDisplay;

  //声明一个Displayable对象承载父窗体
  private Displayable parent;

  //声明一个确认按钮Command对象
  private Command okCommand;

  //声明一个返回上一级窗体按钮Command对象
  private Command backCommand;

  //声明一个代表记录详细信息的窗体对象
  private Form detailForm;

  //声明一个自定义的记录存储类对象
  private RecordDB rdb;

  //声明一个装载记录的向量
  private Vector vectorRecord;

  //声明一个装载记录的枚举集
  private Enumeration enumerationVector;

  //声明一个自定义的记录对象
  private Record record;

  //记录排序的方式，按姓名或按ID号
  private int sortBy;

  /*
    1.构造器
   */
  public RecordList(Display d, Displayable p, int _sortBy) {
    super(null, Choice.IMPLICIT);
    sortBy = _sortBy;
    aDisplay = d;
    parent = p;
    initList();

    okCommand = new Command("确认", Command.OK, 1);
    backCommand = new Command("返回", Command.BACK, 1);
    addCommand(backCommand);
    addCommand(okCommand);
    setCommandListener(this);
  }

  /*
    2.初始化列表
   */
  public void initList() {
    rdb = new RecordDB();
    //根据指定排序方式，获得Record对象
    vectorRecord = rdb.getAllRecords(sortBy);
    enumerationVector = vectorRecord.elements();
    rdb.closeRS();
    setTitle("记录列表");
    while (enumerationVector.hasMoreElements()) {
      record = (Record) enumerationVector.nextElement();
      if (record.getID() < 10) {
        append("0" + record.getID() + "|" + record.getName(), null);
      }
      else {
        append(record.getID() + "|" + record.getName(), null);
      }
    }

  }

  /*
   3.响应按钮事件
   */
  public void commandAction(Command c, Displayable s) {
    if (c == backCommand) {
      aDisplay.setCurrent(parent);
    }
    else if (c == okCommand) {
      detailForm = new RecordInfoForm(aDisplay, parent,
                                      this.getString(this.getSelectedIndex()));
      aDisplay.setCurrent(detailForm);
    }
  }
}