J2ME手机开发--播放声音文件的完整源代码

//可以在你的j2me项目中,用这个类文件来播放声音
//使用方法:
// source = new Source("1.mid");
// source.start();
//我的手机不支持mp3,^_^,没关系,我自己写个程序来放歌听,只是效果差点.

import javax.microedition.media.*;
import javax.microedition.media.Player;
import javax.microedition.media.control.VolumeControl;
import java.io.*;
/**
* @author
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
*/
public class Source implements PlayerListener{

Player p;
VolumeControl volC;

/**
* @param filename 声音文件名称
*/
public Source(String fileName) {
super();
// TODO Auto-generated constructor stub

//定义用来读取声音文件的InputStream
InputStream is = getClass().getResourceAsStream(fileName);
if(is == null){
System.out.println("Error happens: InputStream not found " + fileName);
}

try {
p = Manager.createPlayer(is, "audio/midi");
if(p == null){
System.out.println("Error handler happens: InputStream " + fileName);
}else{
p.addPlayerListener(this);

//"具现"播放器
p.realize();
//预取播放器
p.prefetch();
//将播放器设置为无限次播放
p.setLoopCount(-1);

System.out.println("Realized Player: " + fileName);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
System.out.println(e);
} catch (MediaException e) {
// TODO Auto-generated catch block
e.printStackTrace();
System.out.println(e);
}

//从播放器中获取音量控件
volC = (VolumeControl)p.getControl("VolumeControl");
}

/**关闭播放器
*/
public void destroy(){
if(p != null){
p.close();
}
}

/**
* 从"媒体当前播放到的时刻"开始播放
*/
public void start(){
if(p != null){
try {
p.start();
} catch (MediaException e) {
// TODO Auto-generated catch block
e.printStackTrace();
System.out.println(e);
}
}
}

/**
* 停止当前播放器，注意当调用stop时
* 播放器不会重绕到开头
*/
public void stop(){
if(p != null && p.getState() == Player.STARTED){
try {
p.stop();
System.out.println("The Player stoped here:" + p.getMediaTime());
} catch (MediaException e) {
// TODO Auto-generated catch block
e.printStackTrace();
System.out.println(e);
}
}
}

/**
* 将媒体当前播放到的时刻设置为负值
* 使媒体重绕到开头位置开始播放
*/
public void rewind(){
if(p != null & p.getState() == Player.PREFETCHED){
try {
p.setMediaTime(-1);
p.start();
} catch (MediaException e) {
// TODO Auto-generated catch block
e.printStackTrace();
System.out.println(e);
}
}
}

/**更新播放器的音量
* @param level
* @return
*/
public int setLevel(int level){
return volC.setLevel(level);
}

/** 响应PlayerListener接口的预定义标准事件
* @see javax.microedition.media.PlayerListener#playerUpdate

(javax.microedition.media.Player, java.lang.String, java.lang.Object)
*/
public void playerUpdate(Player p, String event, Object eventData){
// TODO Auto-generated method stub
if(event == STARTED){
System.out.println("MySound Player STARTED");
}else if(event == CLOSED){
System.out.println("MySound Player CLOSED");
}else if(event == END_OF_MEDIA){
System.out.println("MySound Player END_OF_MEDIA");
}else if(event == ERROR){
System.out.println("MySound Player ERROR");
}else if(event == VOLUME_CHANGED){
System.out.println("MySound Player VOLUME_CHANGED");
}else if(event == DURATION_UPDATED){
System.out.println("MySound Player DURATION_UPDATED");
}
}
}