Android SoundPool:播放结束时收到通知

时间:2010-12-14 05:03:26

标签: android soundpool

这个声音很简单,我无法弄清楚为什么我找不到答案lol

我有一个有效的声音池类(感谢教程和我做过的一些调整),它工作正常。

现在的问题是我希望能够随机改变我的背景音乐。 (并不总是在循环中有相同的音乐,但有2或3,当一个完成时,我会播放其他2个中的一个)。

问题是我找不到通知音乐播放完毕的方法。

有什么想法吗?

杰森

5 个答案:

答案 0 :(得分:15)

这就是我的所作所为:

启动上,我使用MediaPlayer获取每次声音点击的长度:

private long getSoundDuration(int rawId){
   MediaPlayer player = MediaPlayer.create(context, rawId);
   int duration = player.getDuration();
   return duration;
}

并将声音加上持续时间存储在一起(在DTO类型的对象中)。

答案 1 :(得分:12)

据我所知,无法用SoundPool完成。

我知道唯一能提供完成通知的音频'播放器'是 MediaPlayer - 它比SoundPool更复杂,但允许设置OnCompletionListener在播放完成时得到通知。

答案 2 :(得分:5)

我有超过100个短声音片段,SoundPool是我的最佳选择。我想在另一个剪辑完成播放后播放一个剪辑。一旦发现没有onCompletionListener()等价,我选择实现runnable。这对我有用,因为第一个声音长度在1到2秒之间,因此我将runnable的持续时间设置为2000.希望它们能够在这个类上工作,因为它有很大的潜力!

答案 3 :(得分:3)

与SoundPool相比,MediaPlayer又重又慢,但SoundPool没有setOnCompletionListener。为了解决这个问题,我使用setOnCompletionListener从SoundPool实现了custom class

用法:类似于MediaPlayer

创建:

SoundPoolPlayer mPlayer = SoundPoolPlayer.create(context, resId);
mPlayer.setOnCompletionListener(
    new MediaPlayer.OnCompletionListener() {
        @Override
        public void onCompletion(MediaPlayer mp) {  //mp will be null here
            Log.d("debug", "completed");
        }
    };
);
mPlayer.play();

暂停:

mPlayer.pause();

车站:

mPlayer.stop();

履历:

mPlayer.resume();

IsPlaying模块:

mPlayer.isPlaying();

欢迎任何拉动请求。我只在这里实现了我需要的东西。

答案 4 :(得分:1)

我遇到了类似的问题,并创建了一个SoundPool队列,该队列使要播放的声音排队,并在每种声音完成播放时通知。它在Kotlin中,但是应该很容易翻译成Java。

class SoundPoolQueue(private val context: Context, maxStreams: Int) {
    companion object {
        private const val LOG_TAG = "SoundPoolQueue"
        private const val SOUND_POOL_HANDLER_THREAD_NAME = "SoundPoolQueueThread"
        private const val ACTION_PLAY_SOUND = 1

        @JvmStatic
        fun getSoundDuration(context: Context, soundResId: Int) : Long {
            val assetsFileDescriptor = context.resources.openRawResourceFd(soundResId)
            val mediaMetadataRetriever = MediaMetadataRetriever()

            mediaMetadataRetriever.setDataSource(
                    assetsFileDescriptor.fileDescriptor,
                    assetsFileDescriptor.startOffset,
                    assetsFileDescriptor.length)

            val durationString = mediaMetadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION)
            val duration = durationString.toLong()

            logDebug("SoundPoolQueue::getSoundDuration(): Sound duration millis: $durationString")

            assetsFileDescriptor.close()
            return duration
        }

        @JvmStatic
        private fun logDebug(message: String) {
            if(!BuildConfig.DEBUG) {
                return
            }

            Log.d(LOG_TAG, message)
        }
    }

    private var soundPool = if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        val attrs = AudioAttributes.Builder()
                .setUsage(AudioAttributes.USAGE_NOTIFICATION_EVENT)
                .setContentType(AudioAttributes.CONTENT_TYPE_SPEECH)
                .build()

        SoundPool.Builder()
                .setMaxStreams(maxStreams)
                .setAudioAttributes(attrs)
                .build()
    }
    else {
        @Suppress("DEPRECATION")
        SoundPool(maxStreams, AudioManager.STREAM_NOTIFICATION, 0)
    }

    var soundPoolQueueListener : SoundPoolQueueListener? = null

    private val soundPoolHandlerThread = SoundPoolQueueThread().apply { start() }
    private val soundPoolSoundsSparseArray = SparseArray<SoundPoolSound>()
    private val soundPoolSoundsQueue = LinkedList<SoundPoolSound>()

    fun addSound(soundResId: Int, leftVolume: Float, rightVolume: Float, priority: Int, loop: Boolean, rate: Float) {
        val durationMillis = getSoundDuration(context = context, soundResId = soundResId)
        val soundId = soundPool.load(context, soundResId, priority)

        soundPoolSoundsSparseArray.put(soundResId,
                SoundPoolSound(durationMillis, soundResId, soundId, leftVolume, rightVolume, priority, loop, rate))
    }

    fun playSound(soundResId: Int) {
        logDebug("SoundPoolQueue::playSound()")
        soundPoolSoundsQueue.add(soundPoolSoundsSparseArray[soundResId])
        soundPoolHandlerThread.handler?.sendEmptyMessage(ACTION_PLAY_SOUND)
    }

    inner class SoundPoolQueueThread : HandlerThread(SOUND_POOL_HANDLER_THREAD_NAME) {
        var handler: Handler? = null

        override fun onLooperPrepared() {
            super.onLooperPrepared()

            handler = object : Handler(looper) {
                override fun handleMessage(msg: Message) {
                    super.handleMessage(msg)

                    if(msg.what == ACTION_PLAY_SOUND && handler!!.hasMessages(ACTION_PLAY_SOUND)) {
                        return
                    }

                    if(soundPoolSoundsQueue.isEmpty()) {
                        logDebug("SoundPoolHandlerThread: queue is empty.")
                        handler!!.removeMessages(ACTION_PLAY_SOUND)
                        return
                    }

                    logDebug("SoundPoolHandlerThread: Playing sound!")
                    logDebug("SoundPoolHandlerThread: ${soundPoolSoundsQueue.size} sounds left for playing.")

                    val soundPoolSound = soundPoolSoundsQueue.pop()
                    soundPool.play(soundPoolSound.soundPoolSoundId,
                            soundPoolSound.leftVolume,
                            soundPoolSound.rightVolume,
                            soundPoolSound.priority,
                            if(soundPoolSound.loop) { 1 } else { 0 },
                            soundPoolSound.rate)

                    try {
                        Thread.sleep(soundPoolSound.duration)
                    }
                    catch (ex: InterruptedException) { }

                    //soundPoolQueueListener?.onSoundPlaybackCompleted(soundPoolSound.soundResId)
                    sendEmptyMessage(0)
                }
            }
        }
    }

    interface SoundPoolQueueListener {
        fun onSoundPlaybackCompleted(soundResId: Int)
    }
}

随附的数据类

data class SoundPoolSound(val duration: Long,
                      val soundResId: Int,
                      val soundPoolSoundId: Int,
                      val leftVolume: Float,
                      val rightVolume: Float,
                      val priority: Int,
                      val loop: Boolean,
                      val rate: Float)

当声音在

中播放完毕时,您会收到通知
onSoundPlaybackCompleted(soundResId: Int)

具有已完成播放声音的资源ID。

用法示例:

 private class SoundPoolRunnable implements Runnable {
        @Override
        public void run() {
            LogUtils.debug(SerializableNames.LOG_TAG, "SoundPoolRunnable:run(): Initializing sounds!");

            m_soundPoolPlayer = new SoundPoolQueue(GSMSignalMonitorApp.this, 1);
            m_soundPoolPlayer.setSoundPoolQueueListener(new SoundPoolQueue.SoundPoolQueueListener() {
                @Override
                public void onSoundPlaybackCompleted(int soundResId)
                {
                    LogUtils.debug(SerializableNames.LOG_TAG, "onSoundPlaybackCompleted() " + soundResId);
                }
            });

            m_soundPoolPlayer.addSound(R.raw.gsm_signal_lost, 0.2f, 0.2f, 1, false, 1.0f);
            m_soundPoolPlayer.addSound(R.raw.gsm_signal_restored, 0.2f, 0.2f, 1, false, 1.0f);
            m_soundPoolPlayer.addSound(R.raw.gsm_signal_low, 0.2f, 0.2f, 1, false, 1.0f);

            m_soundPoolPlayer.addSound(R.raw.gsm_signal_lost_ru, 0.2f, 0.2f, 1, false, 1.0f);
            m_soundPoolPlayer.addSound(R.raw.gsm_signal_restored_ru, 0.2f, 0.2f, 1, false, 1.0f);
            m_soundPoolPlayer.addSound(R.raw.gsm_signal_low_ru, 0.2f, 0.2f, 1, false, 1.0f);
        }
    }

希望它会有所帮助:)