SoundPool 音频播放 API 详解【示例】
官方文档
API 介绍
SoundPool(int maxStreams, int streamType, int srcQuality) This constructor was deprecated in API level 21. use SoundPool.Builder instead to create and configure a SoundPool instance- maxStream:同时播放的流的最大数量
- streamType:流的类型,一般为STREAM_MUSIC(具体在AudioManager类中列出)
- srcQuality:采样率转化质量,当前无效果,使用0作为默认值
对指定streamID的播放进行控制
- final void pause(int streamID) Pause a playback stream. 暂停播放
- Pause the stream specified by the streamID. This is the value returned by the play() function. If the stream is playing, it will be paused. If the stream is not playing (e.g. is stopped or was previously paused), calling this function will have no effect. 暂停streamID指定的流。 这是play()函数返回的值。 如果流正在播放,它将被暂停。 如果流未播放(例如,停止或先前已暂停),则调用此功能将不起作用。
- final void resume(int streamID) Resume a playback stream. 继续播放
- Resume the stream specified by the streamID. This is the value returned by the play() function. If the stream is paused, this will resume playback. If the stream was not previously paused, calling this function will have no effect.
- final void stop(int streamID) Stop a playback stream. 终止播放
- Stop the stream specified by the streamID. This is the value returned by the play() function. If the stream is playing, it will be stopped. It also releases any native resources associated with this stream. If the stream is not playing, it will have no effect.
对指定streamID的参数进行设置
- final void setLoop(int streamID, int loop) Set loop mode. 设置指定播放流的循环次数
- A loop value of -1 means loop forever, a value of 0 means don't loop, other values indicate the number of repeats, e.g. a value of 1 plays the audio twice. If the stream does not exist, it will have no effect.
- final void setPriority(int streamID, int priority) Change stream priority. 设置指定播放流的优先级
- Change the priority of the stream specified by the streamID. This is the value returned by the play() function. Affects the order in which streams are re-used to play new sounds. If the stream does not exist, it will have no effect.
- final void setRate(int streamID, float rate) Change playback rate. 设置指定播放流的播放速率
- The playback rate allows the application to vary the playback rate (pitch) of the sound. A value of 1.0 means playback at the original frequency. A value of 2.0 means playback twice as fast, and a value of 0.5 means playback at half speed. If the stream does not exist, it will have no effect.
- final void setVolume(int streamID, float leftVolume, float rightVolume) Set stream volume. 设置指定播放流的音量大小
- Sets the volume on the stream specified by the streamID. This is the value returned by the play() function. The value must be in the range of 0.0 to 1.0. If the stream does not exist, it will have no effect.
全部流的暂停播放与恢复播放
- final void autoPause() Pause all active streams.
- Pause all streams that are currently playing. This function iterates through all the active streams and pauses any that are playing. It also sets a flag so that any streams that are playing can be resumed by calling autoResume(). 暂停正在播放的所有流。 此函数遍历所有活动流并暂停播放任何正在播放的流。 它还设置一个标志,以便可以通过调用autoResume()来恢复正在播放的任何流。
- final void autoResume() Resume all previously active streams.
- Automatically resumes all streams that were paused in previous calls to autoPause().
资源释放
- final boolean unload(int soundID) Unload a sound from a sound ID. 卸载一个指定的音频资源
- Unloads the sound specified by the soundID. This is the value returned by the load() function. Returns true if the sound is successfully unloaded, false if the sound was already unloaded.
- final void release() Release the SoundPool resources. 释放所有资源
- Release all memory and native resources used by the SoundPool object. The SoundPool can no longer be used and the reference should be set to null.
设置监听
- void setOnLoadCompleteListener(SoundPool.OnLoadCompleteListener listener) Sets the callback hook for the OnLoadCompleteListener.
- void onLoadComplete(SoundPool soundPool, int sampleId, int status) Called when a sound has completed loading.
加载音频资源【load】
- 通过一个资源ID,int load(Context context, int resId, int priority)
- 通过指定的路径,int load(String path, int priority)
- 通过一个AssetFileDescriptor对象,int load(AssetFileDescriptor afd, int priority)
- 通过FileDescriptor,int load(FileDescriptor fd, long offset, long length, int priority)
- int ; i < array.length; i++) {
array[i] = i + "、" + array[i];
}
setListAdapter(new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, new ArrayList<>(Arrays.asList(array))));
soundPool = new SoundPool.Builder()
.setMaxStreams(5)
.setAudioAttributes(new AudioAttributes.Builder()
.setUsage(AudioAttributes.USAGE_MEDIA)
.setContentType(AudioAttributes.CONTENT_TYPE_MUSIC).build())
.build();
soundPool.setOnLoadCompleteListener((soundPool1, sampleId, status) -> {
Log.i("bqt", "【onLoadComplete】" + sampleId + " " + status);//status : 0 = success
});
new Thread(this::initReseResources).start();//在子线程中初始化,特别是当有大量资源需要初始化时
}
private void initReseResources() {
Context context = this.getApplicationContext();//不管使用哪个Context,退出当前Activity后都会且会在延迟几秒钟后停止播放
//0-6,通过一个资源ID:Context context, int resId, int priority
soundIdList.add(soundPool.load(context, R.raw.s1_message, 0));
soundIdList.add(soundPool.load(context, R.raw.s10_42kb, 0));
soundIdList.add(soundPool.load(context, R.raw.caravan_15s_59kb, 0));
soundIdList.add(soundPool.load(context, R.raw.s8_67kb, 0));
soundIdList.add(soundPool.load(context, R.raw.ljsw_35s_68kb, 0));
soundIdList.add(soundPool.load(context, R.raw.ljsw_49s_102kb, 0));
soundIdList.add(soundPool.load(context, R.raw.hellow_tomorrow_6s_237kb, 0));
//7,通过指定的路径:String path, int priority
soundIdList.add(soundIdList.size(), 0);//如果文件不存在,则就不能set,否则会throw IndexOutOfBoundsException
String path = Environment.getExternalStorageDirectory() + File.separator + "caravan.mp3";
soundIdList.set(soundIdList.size() - 1, soundPool.load(path, 0));//注意:add和set时传入的index是不一样的!
//8-9,通过AssetFileDescriptor:AssetFileDescriptor afd, int priority
try {
soundIdList.add(soundIdList.size(), 0);//为防止异常后后续的代码执行不到导致index错乱,我们在一开始就直接add两个
soundIdList.add(soundIdList.size(), 0);
AssetFileDescriptor afd = getAssets().openFd("voice/caravan_15s_59kb.mp3");//openNonAssetFd
soundIdList.set(soundIdList.size() - 2, soundPool.load(afd, 0));
//通过FileDescriptor:FileDescriptor fd, long offset, long length, int priority
FileDescriptor fd = afd.getFileDescriptor();
long offset = afd.getStartOffset(), length = afd.getLength();
Log.i("bqt", "【afd】offset=" + offset + ",length=" + length);//offset=40786180,length=60480
soundIdList.set(soundIdList.size() - 1, soundPool.load(fd, offset + length / 2, length / 2, 0));
} catch (IOException e) {
e.printStackTrace();
}
//10
soundIdList.add(soundPool.load(getResources().openRawResourceFd(R.raw.s1_global), 0));
}
@Override
protected void onDestroy() {
super.onDestroy();
soundPool.release();//释放所有资源
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
if (position <= 10) {
int soundID = soundIdList.get(position);
int loop = 0;//0 = no loop, -1 = loop forever
if (position == 0) loop = -1;
else if (position == 1) loop = 2;//3次
//播放指定soundID的音频:【int soundID】, float leftVolume, float rightVolume,int priority, 【int loop】, float rate
int streamID = soundPool.play(soundID, 1.0f, 1.0f, 1, loop, 1.0f);
Toast.makeText(this, "soundID=" + soundID + " streamID=" + streamID, Toast.LENGTH_SHORT).show();
//指定streamID的参数进行设置,这些参数都可以在播放时指定
soundPool.setLoop(streamID, 1);//实践证明,这里设置无效
switch (position) {
case 1:
soundPool.setRate(streamID, 1.5f);//大小并没有限制,但是一般不要小于0.5,不要大于1.5,否则声音严重失真
soundPool.setVolume(streamID, 1.0f, 0.1f);//只能降低,不能提高。The value must be in the range of 0.0 to 1.0
break;
case 2:
soundPool.setRate(streamID, 0.5f);
soundPool.setVolume(streamID, 0.1f, 1.0f);
break;
}
} else {
switch (position) {
case 11:
soundPool.autoPause();//可以多次调用,每次都是把当前正在播放的音乐暂停,并加入同一个列表中
break;
case 12:
soundPool.autoResume();//将所有暂停的音乐从暂停位置重新开始播放
break;
case 13:
Toast.makeText(this, "" + soundPool.unload(soundIdList.get(0)) + " " + soundPool.unload(soundIdList.get(1))
, Toast.LENGTH_SHORT).show();//unload并不能停止正在播放的音乐,特别是loop=-1的,仍会循环播放
break;
case 14:
soundPool.release();//会停止正在播放的所有音乐
break;
}
}
}
}
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