参考了一下网上别人写的，再使用的时候是放在新开的线程中来播放音乐的，后来发现每次进入Activity后就会重复开始一个音乐播放的声音。为了避免重复开启播放功能我在原来代码的基础上增加了单例模式。这样就避免了出现重复播放。

package com.liu.zhen.utils; import android.content.Context; import android.content.res.AssetFileDescriptor; import android.media.MediaPlayer; import android.util.Log; /** * * This class is used for controlling background music * */ public class BackgroundMusic { private static BackgroundMusic backgroundMusic = null; private static final String TAG = "Bg_Music"; private float mLeftVolume; private float mRightVolume; private Context mContext; private MediaPlayer mBackgroundMediaPlayer; private boolean mIsPaused; private String mCurrentPath; private BackgroundMusic(Context context) { this.mContext = context; initData(); } public static BackgroundMusic getInstance(Context context) { if (backgroundMusic == null) { backgroundMusic = new BackgroundMusic(context); } return backgroundMusic; } // 初始化一些数据 private void initData() { mLeftVolume = 0.5f; mRightVolume = 0.5f; mBackgroundMediaPlayer = null; mIsPaused = false; mCurrentPath = null; } /** * 根据path路径播放背景音乐 * * @param path * :assets中的音频路径 * @param isLoop * :是否循环播放 */ public void playBackgroundMusic(String path, boolean isLoop) { if (mCurrentPath == null) { // 这是第一次播放背景音乐--- it is the first time to play background music // 或者是执行end()方法后，重新被叫---or end() was called mBackgroundMediaPlayer = createMediaplayerFromAssets(path); mCurrentPath = path; } else { if (!mCurrentPath.equals(path)) { // 播放一个新的背景音乐--- play new background music // 释放旧的资源并生成一个新的----release old resource and create a new one if (mBackgroundMediaPlayer != null) { mBackgroundMediaPlayer.release(); } mBackgroundMediaPlayer = createMediaplayerFromAssets(path); // 记录这个路径---record the path mCurrentPath = path; } } if (mBackgroundMediaPlayer == null) { Log.e(TAG, "playBackgroundMusic: background media player is null"); } else { // 若果音乐正在播放或已近中断，停止它---if the music is playing or paused, stop it mBackgroundMediaPlayer.stop(); mBackgroundMediaPlayer.setLooping(isLoop); try { mBackgroundMediaPlayer.prepare(); mBackgroundMediaPlayer.seekTo(0); mBackgroundMediaPlayer.start(); this.mIsPaused = false; } catch (Exception e) { Log.e(TAG, "playBackgroundMusic: error state"); } } } /** * 停止播放背景音乐 */ public void stopBackgroundMusic() { if (mBackgroundMediaPlayer != null) { mBackgroundMediaPlayer.stop(); // should set the state, if not , the following sequence will be // error // play -> pause -> stop -> resume this.mIsPaused = false; } } /** * 暂停播放背景音乐 */ public void pauseBackgroundMusic() { if (mBackgroundMediaPlayer != null && mBackgroundMediaPlayer.isPlaying()) { mBackgroundMediaPlayer.pause(); this.mIsPaused = true; } } /** * 继续播放背景音乐 */ public void resumeBackgroundMusic() { if (mBackgroundMediaPlayer != null && this.mIsPaused) { mBackgroundMediaPlayer.start(); this.mIsPaused = false; } } /** * 重新播放背景音乐 */ public void rewindBackgroundMusic() { if (mBackgroundMediaPlayer != null) { mBackgroundMediaPlayer.stop(); try { mBackgroundMediaPlayer.prepare(); mBackgroundMediaPlayer.seekTo(0); mBackgroundMediaPlayer.start(); this.mIsPaused = false; } catch (Exception e) { Log.e(TAG, "rewindBackgroundMusic: error state"); } } } /** * 判断背景音乐是否正在播放 * * @return：返回的boolean值代表是否正在播放 */ public boolean isBackgroundMusicPlaying() { boolean ret = false; if (mBackgroundMediaPlayer == null) { ret = false; } else { ret = mBackgroundMediaPlayer.isPlaying(); } return ret; } /** * 结束背景音乐，并释放资源 */ public void end() { if (mBackgroundMediaPlayer != null) { mBackgroundMediaPlayer.release(); } // 重新“初始化数据” initData(); } /** * 得到背景音乐的“音量” * * @return */ public float getBackgroundVolume() { if (this.mBackgroundMediaPlayer != null) { return (this.mLeftVolume + this.mRightVolume) / 2; } else { return 0.0f; } } /** * 设置背景音乐的音量 * * @param volume * ：设置播放的音量，float类型 */ public void setBackgroundVolume(float volume) { this.mLeftVolume = this.mRightVolume = volume; if (this.mBackgroundMediaPlayer != null) { this.mBackgroundMediaPlayer.setVolume(this.mLeftVolume, this.mRightVolume); } } /** * create mediaplayer for music * * @param path * the path relative to assets * @return */ private MediaPlayer createMediaplayerFromAssets(String path) { MediaPlayer mediaPlayer = null; try { AssetFileDescriptor assetFileDescritor = mContext.getAssets() .openFd(path); mediaPlayer = new MediaPlayer(); mediaPlayer.setDataSource(assetFileDescritor.getFileDescriptor(), assetFileDescritor.getStartOffset(), assetFileDescritor.getLength()); mediaPlayer.prepare(); mediaPlayer.setVolume(mLeftVolume, mRightVolume); } catch (Exception e) { mediaPlayer = null; Log.e(TAG, "error: " + e.getMessage(), e); } return mediaPlayer; } }

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