背景音乐

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我们使用android自带的播放器功能做一个背景音乐，主要我们可以使用隐式Intent来调用它：通过传入一个Action为ACTION_VIEW同时，指定Data为所要播放的Audio的Uri对象，并指定格式信息，调用播放器来播放该Audio。

集体的实现

1、界面

2、AudioService.java（多线程实现后台音乐播放）

</pre><pre name="code" class="java">    * 多线程实现后台播放背景音乐的service       */      import android.app.Service;      import android.content.Intent;      import android.media.MediaPlayer;      import android.os.Binder;      import android.os.IBinder;            public class AudioService extends Service implements              MediaPlayer.OnCompletionListener {          // 实例化MediaPlayer对象          MediaPlayer player;          private final IBinder binder = new AudioBinder();                @Override          public IBinder onBind(Intent intent) {              return binder;          }                public void onCreate() {              super.onCreate();              // 从raw文件夹中获取一个应用自带的mp3文件              player = MediaPlayer.create(this, R.raw.qq);              player.setOnCompletionListener(this);              player.setLooping(true);          }                @Override          public int onStartCommand(Intent intent, int flags, int startId) {              super.onStartCommand(intent, flags, startId);              if (!player.isPlaying()) {                  new MusicPlayThread().start();              }              else player.isPlaying();              return START_STICKY;          }                          /**          * 当Audio播放完的时候触发该动作          */          public void onCompletion(MediaPlayer mp) {              stopSelf();// 结束了，则结束Service                }                public void onDestroy() {              super.onDestroy();              if (player.isPlaying()) {                  player.stop();              }              player.release();          }                // 为了和Activity交互，我们需要定义一个Binder对象          public class AudioBinder extends Binder {              // 返回Service对象              public AudioService getService() {                  return AudioService.this;              }          }                private class MusicPlayThread extends Thread {              public void run() {                  if (!player.isPlaying()) {                      player.start();                  }              }          }               }

    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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