使用SoundPool 同時播放多個音訊
阿新 • • 發佈:2019-01-04
MediaPlayer 是多媒體包的一個 基本工具,但它一次只能處理一個音訊或 視訊檔案.
如果只有少量的音訊要播放,並且想要快速的效能,SoundPool 類可提供幫助, 它在底層使用了 MediaPlayer API
SoundPool 與 MediaPlayer 之間的一個區別是: SoundPool 是僅為處理本地媒體檔案而設計的
以下提供一個載入和播放 簡單聲音的示例.
當示例程式啟動時,建立 SoundPool 並向其中載入音取樣,然後開始播放它們,蟋蟀叫聲不停地迴圈播放,而其他取樣在一定延遲之後播放,然後將自身設定為在相同延遲之後再次播放,
主要程式碼如下:
@Override protected void onResume() { soundPool = new SoundPool(4, AudioManager.STREAM_MUSIC, SRC_QUALITY); soundPool.setOnLoadCompleteListener(this); aMgr = (AudioManager)this.getSystemService(Context.AUDIO_SERVICE); sid_background = soundPool.load(this, R.raw.crickets, PRIORITY); //蟋蟀 sid_chimp = soundPool.load(this, R.raw.chimp, PRIORITY);//黑猩猩 sid_rooster = soundPool.load(this, R.raw.rooster, PRIORITY);//公雞 sid_roar = soundPool.load(this, R.raw.roar, PRIORITY);//怒吼 try { AssetFileDescriptor afd = this.getAssets().openFd("dogbark.mp3"); // 狗叫聲 sid_bark = soundPool.load(afd.getFileDescriptor(), 0, afd.getLength(), PRIORITY); afd.close(); } catch (IOException e) { e.printStackTrace(); } //sid_bark = soundPool.load("/mnt/sdcard/dogbark.mp3", PRIORITY); super.onResume(); } @Override public void onLoadComplete(SoundPool sPool, int sid, int status) { Log.v("soundPool", "sid " + sid + " loaded with status " + status); final float currentVolume = ((float)aMgr.getStreamVolume(AudioManager.STREAM_MUSIC)) / ((float)aMgr.getStreamMaxVolume(AudioManager.STREAM_MUSIC)); if(status != 0) return; if(sid == sid_background) { if(sPool.play(sid, currentVolume, currentVolume, PRIORITY, -1, 1.0f) == 0) { Log.v("soundPool", "Failed to start sound"); } } else if(sid == sid_chimp) { queueSound(sid, 5000, currentVolume); } else if(sid == sid_rooster) { queueSound(sid, 6000, currentVolume); } else if(sid == sid_roar) { queueSound(sid, 12000, currentVolume); } else if(sid == sid_bark) { queueSound(sid, 7000, currentVolume); } } private void queueSound(final int sid, final long delay, final float volume) { new Handler().postDelayed(new Runnable() { @Override public void run() { if(soundPool == null) return; if(soundPool.play(sid, volume, volume,PRIORITY, 0, 1.0f) == 0) { Log.e("soundPool", "Failed to start sound (" + sid + ")"); } queueSound(sid, delay, volume); } }, delay); }