playmusic.java

一个播放音乐的J2ME程序,已调试成功,在Eclipse环境下编写,由J2ME模拟器仿真成功

import java.io.IOException;
import java.io.InputStream;
import javax.microedition.media.*;
import javax.microedition.media.Player;
import javax.microedition.media.PlayerListener;
import javax.microedition.media.control.VolumeControl;
//import javax.microedition.midlet.MIDlet;
//import javax.microedition.midlet.MIDletStateChangeException;
public  class playmusic implements PlayerListener {
	private Player player;
	private int i_LEVEL=500;//音量初始值
	private VolumeControl volumeControl;
	private String URL;
	private boolean b_cycle=false;//循环播放
	InputStream is; //输入流
	/*****************************************************
	功能：构造播放器
    输入：音乐文件路径
   *****************************************************/
	public playmusic(String url1) {
		URL = url1;
		String type="";
		is=getClass().getResourceAsStream(URL);//从url1获得播放资源的输入流
		try {
	        if(URL.endsWith("wma")||URL.endsWith("WMA"))
	        { //如果后缀名为wma
	        	type = "audio/x-wma";
	        }
	        else if(URL.endsWith("midi")||URL.endsWith("MIDI"))
	        { //如果后缀名为mid
	            type = "audio/midi";
	        }	
	        player = Manager.createPlayer(is,type); //管理程序创建一个播放器格式为audio/x-wav
	      }
		catch(MediaException ex)
			{
			System.out.println(ex.toString());	
			}
		catch (IOException ex) 
			{
			System.out.println(ex.toString());
			}
	  
	}
	public void getUrl(String url) {
	    URL = url;
	  }
	  /*****************************************************
	     功能：播放声音
	     输入：1.无
	          2.音量
	     输出：无
	    *****************************************************/
	public void play(){
	    try {
	      if(player != null && player.getState() == Player.STARTED) { 
	    	 
	    	  player.close();
	    	  player = null;
	      	}
	      player.realize();
	      player.start(); //开始播放
	      SetVolume(player, i_LEVEL); //设置音量(Player对象，音量大小)
	    	}
	    catch (MediaException ex) 
	    	{
	    	System.out.println(ex.toString());
	    	}
	  }
	public void play(int i_LEVEL){
	    try {
	    	player.start(); //开始播放
	    	SetVolume(player, i_LEVEL); //设置音量(Player对象，音量大小)
	    	}
	    catch (MediaException ex) 
	    	{
	    	System.out.println(ex.toString());
	    	}
	  	}
	public void play(int i_LEVEL,boolean cycle){
	    play(i_LEVEL);
	    player.addPlayerListener(this);
	    b_cycle = cycle;
	  }
	public void playerUpdate(Player player, String string, Object object) {
		if (string == "endOfMedia" && b_cycle==true) {
			try {
					player.start();
				}
	      catch (MediaException ex) {}
	    }
	  }
	/*****************************************************
    功能：停止音乐
 *****************************************************/
	public void stopPlayer(){
		try {
			player.stop();
		}
		catch (MediaException ex) {
		}
	}
/*****************************************************
   功能：关闭音乐
*****************************************************/
	public void closeAllPlayer(){
		if(player != null){
			player.close();
			player = null;
		}
	}
/*****************************************************
   功能：设置音量
   输入：Player对象
        音量级别(0-100)
   输出：无
  *****************************************************/
	private void SetVolume(Player player,int i_Level){
		volumeControl = (VolumeControl)player.getControl("VolumeControl");//获控制设置为音量控制
		volumeControl.setLevel(i_Level);//设置音量
	}
}