Android下的一个音乐播放工具类

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import android.content.Context;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.SoundPool;

import com.ruanko.shengji4Android.R;
import com.ruanko.shengji4Android.model.SysSetting;

public class MusicPlayer implements MediaPlayer.OnCompletionListener, MediaPlayer.OnErrorListener {
	private Context context;
	private MediaPlayer bgPlayer;  //播放背景音乐的播放器
	private SoundPool actionMusicPlayer;  //播放音效的播放器
	private int source_da,source_givecard,source_start,source_win,source_calllord;  //各种音效的source

	public MusicPlayer(Context context) {  //初始化
		this.context = context;
		this.actionMusicPlayer = new SoundPool(10, AudioManager.STREAM_SYSTEM,5);  //这里指定声音池的最大音频流数目为10，声音品质为5大家可以自己测试感受下效果
		this.source_da = actionMusicPlayer.load(context, R.raw.da, 0);
		this.source_givecard = actionMusicPlayer.load(context, R.raw.givecard, 0);
		this.source_start = actionMusicPlayer.load(context, R.raw.start, 0);
		this.source_win = actionMusicPlayer.load(context, R.raw.win, 0);
		this.source_calllord = actionMusicPlayer.load(context, R.raw.calllord, 0);
	}

	public void onCompletion(MediaPlayer mp) {  //音频文件播放完成时自动调用

	}

	public boolean onError(MediaPlayer mp, int what, int extra) {  //音频文件播放发生错误时自动调用
		return false;
	}

	public void playBgSound(int paramInt) {  //播放背景音乐，paramInt为音频文件ID
		if(!SysSetting.getInstance(context).isBgSound()) {  //SysSetting为一个单例类，是我自己定义的，用于保存本应用程序相关设置，isBgSound()为得到是否开启背景音乐设置
			return;
		}

		stopSound(bgPlayer);

		try {
			MediaPlayer mediaPlayer = MediaPlayer.create(context, paramInt);
			bgPlayer = mediaPlayer;
			bgPlayer.setOnCompletionListener(this);
			bgPlayer.setLooping(true);  //设置是否循环，一般背景音乐都设为true
			bgPlayer.start();
		} catch (IllegalStateException e) {
			e.printStackTrace();
		} 
	}

	public MediaPlayer getBackGroundPlayer() {
		return this.bgPlayer;
	}

	public void stopBgSound() {  //停止背景音乐的播放
		if(bgPlayer == null) 
			return;
		if(bgPlayer.isPlaying())
			bgPlayer.stop();
		bgPlayer.release();
		bgPlayer = null;
	}

	private void playSound(int source) {  //如果系统设置中开启了音效，则播放相关的音频文件
		if(SysSetting.getInstance(context).isEffectSound()) {
			actionMusicPlayer.play(source, 1, 1, 0, 0, 1);
		}
	}

	public void playHitCardSound() {
		playSound(source_da);
	}

	public void playGiveCardSound() {
		playSound(source_givecard);
	}

	public void playStartSound() {
		playSound(source_start);
	}

	public void playWinSound() {
		playSound(source_win);
	}

	public void playCalllordSound() {
		playSound(source_calllord);
	}
}

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public static MusicPlayer musicPlayer;

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		if(musicPlayer == null) {
			SysSetting.getInstance(getApplicationContext()).load();  //加载系统设置，SysSetting为我自己定义的一个类，由于代码较长，就不给出了
			musicPlayer = new MusicPlayer(getApplicationContext());
			musicPlayer.playBgSound(R.raw.welcome);  //播放背景音乐
		}