itemstateevent_midlet.java

本光盘是《J2ME无线移动游戏开发》一书的配套光盘

package ch04;

import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;

public class ItemStateEvent_MIDlet
    extends MIDlet
    implements ItemStateListener {

  //声明一个Display对象
  Display display;

  //声明一个窗体对象
  Form form;

  //声明两个文本域对象
  TextField t1, t2;

  /*
   1.构造器
   */
  public ItemStateEvent_MIDlet() {
    form = new Form("复制文字");
    t1 = new TextField("源 文 字：", "", 60, TextField.ANY);
    t2 = new TextField("目标文字：", "", 60, TextField.ANY);
    form.append(t1);
    form.append(t2);
    display = Display.getDisplay(this);
    display.setCurrent(form);
    form.setItemStateListener(this);
  }

  /*
   2.响应条目状态改变事件
   */
  public void itemStateChanged(Item item) {
    t2.setString(t1.getString());
  }

  //启动应用程序
  public void startApp() throws MIDletStateChangeException {
  }

  //挂起应用程序
  public void pauseApp() {
    display = null;
  }

  //撤销应用程序
  public void destroyApp(boolean unconditional) {
    notifyDestroyed();
  }

}