listexclusivemidlet.java

来自「<j2me 开发精解> 詹建光著 里所有的源码。对J2me的开发相当」· Java 代码 · 共 47 行

package com.j2medev.sample.chapter3;

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

public class ListExclusiveMidlet extends MIDlet implements CommandListener {
    
    private String[] elements = {"SUN中国技术社区", "java.net", "J2ME开发网"};
    //根据elements的内容初始化list
    private List list = new List("优秀站点", List.EXCLUSIVE, elements, null);
    private Command okCommand = new Command("选择", Command.OK,  1);
    private Display display = null;
    
    public ListExclusiveMidlet() {
        //为List添加Command并注册监听器
        list.addCommand(okCommand);
        list.setCommandListener(this);
    }
    
    public void startApp() {
        if(display==null) {
            display = Display.getDisplay(this);
            display.setCurrent(list);
        }else{
            display.setCurrent(list);
        }
    }
    
    public void pauseApp() {
    }
    
    public void destroyApp(boolean unconditional) {
    }
    
    public void commandAction(Command cmd, Displayable displayable) {
        if(cmd==okCommand) {
            //查询用户选择的List选项
            int selectedIndex = list.getSelectedIndex();
            String item = list.getString(selectedIndex);
            Alert alert = new Alert("系统确认", "您选择了"+item, null, AlertType.CONFIRMATION);
            alert.setTimeout(2000);
            display.setCurrent(alert, list);
        }
    }
    
}