alarmmodel.java

<j2me 开发精解> 詹建光著 里所有的源码。对J2me的开发相当有帮助

package com.j2medev.ch7.push;

import java.io.IOException;
import java.io.InputStream;
import java.util.Calendar;
import java.util.Date;
import javax.microedition.media.Manager;
import javax.microedition.media.MediaException;
import javax.microedition.media.Player;
import javax.microedition.rms.RecordStore;
import javax.microedition.rms.RecordStoreException;

public class AlarmModel {
    
    private RecordStore rs = null;
    private Player player = null;
    
    public AlarmModel() {
        try{
           rs = RecordStore.openRecordStore("alarm",true);
        }catch(RecordStoreException ex){
            ex.printStackTrace();
        }
    }
    //写入记录
    public void writeDate(Date date){
        String s = AlarmModel.getString(date);
        try{
            int num = rs.getNumRecords();
            if(num == 0){
                rs.addRecord(s.getBytes(), 0, s.getBytes().length);
            }else{
                rs.setRecord(1, s.getBytes(), 0, s.getBytes().length);
            }
        }catch(RecordStoreException ex){
            ex.printStackTrace();
        }
    }
    //读取RMS中的记录
    public String readDate(){
        String date = null;
        try{
            int num = rs.getNumRecords();
            if(num == 0){
                return date;
            }else{
                byte[] data = rs.getRecord(1);//每次都读取id为1的记录
                return new String(data);
            }
        }catch(RecordStoreException ex){
            return null;
        }
    }
    //关闭rs
    public void closeRecordStore(){
        if(rs != null){
            try{
                rs.closeRecordStore();
            }catch(RecordStoreException ex){
               //处理异常 
            }
        }
    }
    
    public void release(){
        closeRecordStore();
        stopSound();
    }
    
    public void playSound(){
        InputStream is = this.getClass().getResourceAsStream("/pattern.mid");
        if(is != null){
            try{
                //创建播放器，播放闹钟铃声
                player = Manager.createPlayer(is, "audio/midi");
                player.setLoopCount(-1);//无限次循环播放
                player.start();
            }catch(IOException ex){
                ex.printStackTrace();
            }
            catch(MediaException mex){
                mex.printStackTrace();
            }
        }
    }
    
    public void stopSound(){
        if(player != null){
            try{
                //停止播放器
                player.stop();
                player = null;
            }catch(MediaException me){
                //处理异常
            } 
        }
    }
    //将Date转换为String，精确到分钟
    public static String getString(Date d){
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(d);
        String s = ""+calendar.get(Calendar.YEAR)+calendar.get(Calendar.MONTH)+
                calendar.get(Calendar.DAY_OF_MONTH)+calendar.get(Calendar.HOUR_OF_DAY)+
                calendar.get(Calendar.MINUTE);
        return s;
    }
}