recordinfoform.java

本光盘是《J2ME无线移动游戏开发》一书的配套光盘

package ch12;

import javax.microedition.lcdui.*;

public class RecordInfoForm
    extends Form
    implements CommandListener {
  //声明一个Display对象
  private Display display;

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

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

  //声明一个构成菜单项的删除按钮Command对象
  private Command deleteCommand;

  //声明一个构成菜单项的修改按钮Command对象
  private Command modifyCommand;

  //声明一个代表记录中ID号的StringItem
  private StringItem idItem;

  //声明一个代表记录中姓名的StringItem
  private StringItem nameItem;

  //声明一个代表记录中积分的StringItem
  private StringItem scoreItem;

  //声明一个代表记录中排名的StringItem
  private StringItem rankItem;

  //声明一个代表记录中日期的StringItem
  private StringItem dateItem;

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

  //声明一个代表ID号的字符串
  private String stringID;

  //声明一个代表ID号的整型值
  private int id;

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

  //声明一个代表记录中ID号临时变量
  private int _id;

  //声明一个代表记录中姓名的临时变量
  private String _name;

  //声明一个代表记录中积分的临时变量
  private String _score;

  //声明一个代表记录中排名的临时变量
  private String _rank;

  //声明一个代表记录中日期的临时变量
  private String _date;

  /*
    1.构造器
   */
  public RecordInfoForm(Display d, Displayable p, String idAndName) {
    super("记录详细信息");
    display = d;
    parent = p;
    backCommand = new Command("返回", Command.BACK, 1);
    deleteCommand = new Command("删除", Command.SCREEN, 2);
    modifyCommand = new Command("修改", Command.SCREEN, 2);
    addCommand(backCommand);
    addCommand(deleteCommand);
    addCommand(modifyCommand);
    setCommandListener(this);

    rdb = new RecordDB();
    //从idAndName中取出id
    stringID = idAndName.substring(0, 2);
    id = Integer.parseInt(stringID);
    record = rdb.getRecord(id);

    _id = record.getID();
    _name = record.getName();
    _score = record.getScore();
    _rank = record.getRank();
    _date = record.getDate();
    //注意StringItem和String的区别：前者可以建立一个具有label标签、内容的。后者没有标签，只有内容
    idItem = new StringItem("ID:", _id + "");
    nameItem = new StringItem("姓名:", _name);
    scoreItem = new StringItem("积分:", _score);
    rankItem = new StringItem("名次:", _rank);
    dateItem = new StringItem("日期:", _date);

    append(idItem);
    append(nameItem);
    append(scoreItem);
    append(rankItem);
    append(dateItem);
  }

  /*
   2.响应按钮事件
   */
  public void commandAction(Command c, Displayable s) {
    if (c == backCommand) {
      display.setCurrent(parent);
    }
    else if (c == deleteCommand) {
      DeleteRecordForm dff = new DeleteRecordForm(display, parent, _id, _name,
                                                  _score, _rank, _date);
      display.setCurrent(dff);
    }
    else if (c == modifyCommand) {
      ModifyRecordForm mff = new ModifyRecordForm(display, parent, _id, _name,
                                                  _score, _rank, _date);
      display.setCurrent(mff);
    }
  }
}