alarmmidlet.java

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package com.j2medev.ch7.push;

import java.util.Calendar;
import java.util.Date;
import javax.microedition.midlet.MIDlet;
import javax.microedition.lcdui.*;
import javax.microedition.io.*;

public class AlarmMIDlet extends MIDlet implements CommandListener {
    
    private Display display = null;
    private Form form = null;
    private AlarmModel model = null;
    private Date set = null;
    private DateField date = new DateField("启动时间",DateField.DATE_TIME);
    public static final Command exitCommand = new Command("退出",Command.EXIT, 1);
    public static final Command okCommand = new Command("注册",Command.OK,2);
    public static final Command stopCommand = new Command("停止",Command.EXIT, 1);
    public static final String className = "com.j2medev.ch7.push.AlarmMIDlet";
    
    protected void startApp(){
        if(display == null){
            display = Display.getDisplay(this);
            form = new Form("PUSH注册");
            Date now = new Date();
            date.setDate(now);
            form.append(date);
            form.addCommand(okCommand);
            form.addCommand(exitCommand);
            form.setCommandListener(this);
            model = new AlarmModel();
            String snow = model.readDate();
            if(snow != null){//RMS中存在以前注册的时间
                Date tnow = new Date();
                String s = AlarmModel.getString(tnow);
                //判断当前时间是否与注册时间相同
                if(snow.equals(s)){
                    //相等，代表时PUSH注册唤醒了MIDlet
                    Form f = new Form("闹钟");
                    f.append("闹钟响起来咯");
                    f.addCommand(stopCommand);
                    f.setCommandListener(this);
                    //播放声音
                    model.playSound();
                    display.setCurrent(f);
                    return;
                }
            }
        }
        //非PUSH注册唤醒MIDlet情况下，显示主界面
        display.setCurrent(form);
    }
    protected void pauseApp() {  
    }
    protected void destroyApp(boolean arg0){
        //释放资源
        display = null;
        model.release();
    }
    //响应用户动作
    public void commandAction(Command cmd,Displayable displayable){
        if(cmd == exitCommand){
            destroyApp(true);
            notifyDestroyed();
        }else if(cmd == okCommand){
            //在新线程中注册，避免堵塞。事实上在Nokia 7610中测试主线程注册也可以
            set = date.getDate();
            new Thread(new AlarmSetter()).start();
        }else if(cmd == stopCommand){
           model.stopSound();
           display.setCurrent(form);
        }
    }
    
    class AlarmSetter implements Runnable{
        public void run(){
            try {
                //将闹钟设置时间存储到RMS中
                model.writeDate(set);
                //注册时钟
                PushRegistry.registerAlarm(className,set.getTime());
                Alert alert = new Alert("完成提示");
                alert.setTimeout(2000);
                alert.setString("您已经成功设置了闹钟");
                alert.setType(AlertType.CONFIRMATION);
                display.setCurrent(alert, form);
            } catch(Exception e) {
                e.printStackTrace();
            }
        }
    }
    
}