SoundPool 的使用

package com.pecuyu.soundpooltest; import android.content.Context; import android.media.AudioAttributes; import android.media.AudioManager; import android.media.SoundPool; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.util.Log; import android.view.View; import android.widget.SeekBar; /** * @author pecuyu * @date 2018.9.18 */ public class MainActivity extends AppCompatActivity implements SoundPool.OnLoadCompleteListener { private static final String TAG = MainActivity.class.getSimpleName(); private SoundPool mSoundPool; private static final int DEFAULT_INVALID_SOUND_ID = -Integer.MAX_VALUE; private static final int DEFAULT_INVALID_STREAM_ID = -Integer.MAX_VALUE; private int mSoundId = DEFAULT_INVALID_SOUND_ID; private int mStreamID = DEFAULT_INVALID_STREAM_ID; private SeekBar mLeftVolumeBar, mRightVolumeBar, mRateBar; // 调节左右volume的 seekbar private AudioManager mAudioManager; private float mCruLeftVolume, mCurRightVolume; // 用于设置sound pool的左右volume值 0~1f private int mVolumeBarMax; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mLeftVolumeBar = findViewById(R.id.id_sk_left_vloume); mRightVolumeBar = findViewById(R.id.id_sk_right_vloume); mRateBar = findViewById(R.id.id_sk_rate); mRateBar.setProgress(50); mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE); float volumeRate = getVolumeRate(); mCruLeftVolume = volumeRate; mCurRightVolume = volumeRate; //计算位置 mVolumeBarMax = mLeftVolumeBar.getMax(); int position = (int) (mVolumeBarMax * volumeRate); mRightVolumeBar.setProgress(position); mLeftVolumeBar.setProgress(position); mLeftVolumeBar.setOnSeekBarChangeListener(mSeekBarListener); mRightVolumeBar.setOnSeekBarChangeListener(mSeekBarListener); mRateBar.setOnSeekBarChangeListener(mSeekBarListener); } private OnSeekBarChangeListenerAdapter mSeekBarListener = new OnSeekBarChangeListenerAdapter() { @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { super.onProgressChanged(seekBar, progress, fromUser); if (mSoundPool == null) return; // mSoundPool may not be initialized then float volume = progress * 1.0f / mVolumeBarMax; switch (seekBar.getId()) { case R.id.id_sk_left_vloume: // 设置左 volume mCruLeftVolume = volume; mSoundPool.setVolume(mStreamID, mCruLeftVolume, mCurRightVolume); break; case R.id.id_sk_right_vloume: // 设置又 volume mCurRightVolume = volume; mSoundPool.setVolume(mStreamID, mCruLeftVolume, mCurRightVolume); break; case R.id.id_sk_rate: float rate = 0.5f + progress * 1.0f / mVolumeBarMax * 1.5f; mSoundPool.setRate(mStreamID, rate); break; } } }; /** * 计算volume当前占比 * 比如当前是10 , 范围是 0~15 * * @return rate */ private float getVolumeRate() { if (mAudioManager != null) { int streamVolume = mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC); //int streamMinVolume = mAudioManager.getStreamMinVolume(AudioManager.STREAM_MUSIC); int streamMaxVolume = mAudioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC); Log.d(TAG, "streamVolume=" + streamVolume + "," + //" streamMinVolume=" + streamMinVolume + " streamMaxVolume=" + streamMaxVolume); return streamVolume * 1.0f / streamMaxVolume; } return 0; } /** * 创建SoundPool */ private void createSoundPoolIfNeeded() { if (mSoundPool == null) { // 5.0 及 之后 if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) { AudioAttributes audioAttributes = null; audioAttributes = new AudioAttributes.Builder() .setUsage(AudioAttributes.USAGE_MEDIA) .setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION) .build(); mSoundPool = new SoundPool.Builder() .setMaxStreams(16) .setAudioAttributes(audioAttributes) .build(); } else { // 5.0 以前 mSoundPool = new SoundPool(16, AudioManager.STREAM_MUSIC, 0); // 创建SoundPool } mSoundPool.setOnLoadCompleteListener(this); // 设置加载完成监听 } } /** * 播放:如果资源还没有加载,则可能会有一小段等待时间 */ private void playMayWait() { createSoundPoolIfNeeded(); if (mSoundId == DEFAULT_INVALID_SOUND_ID) { // mSoundId is invalid ,load from res raw for once before mSoundPool is released mSoundId = mSoundPool.load(getApplicationContext(), R.raw.autotest, 1); // 加载音频资源 } else { // reuse the loaded res if (mStreamID == DEFAULT_INVALID_STREAM_ID) onLoadComplete(mSoundPool, 0, 0); // manually call this method when there is a valid mSoundId } } /** * 停止播放 */ private void stop() { if (mSoundPool != null) { mSoundPool.stop(mStreamID); mStreamID = DEFAULT_INVALID_STREAM_ID; } } /** * 释放资源 */ private void releaseSoundPool() { if (mSoundPool != null) { mSoundPool.autoPause(); mSoundPool.unload(mSoundId); mSoundId = DEFAULT_INVALID_SOUND_ID; mSoundPool.release(); mSoundPool = null; } } @Override public void onLoadComplete(SoundPool soundPool, int sampleId, int status) { if (mSoundPool != null) { if (mStreamID == DEFAULT_INVALID_STREAM_ID) mStreamID = mSoundPool.play(mSoundId, mCruLeftVolume, mCurRightVolume, 16, -1, 1.0f); } } public void play(View view) { playMayWait(); } public void pause(View view) { if (mSoundPool != null) { mSoundPool.pause(mStreamID); } } public void resume(View view) { if (mSoundPool != null) { mSoundPool.resume(mStreamID); } } public void stop(View view) { stop(); } @Override protected void onDestroy() { super.onDestroy(); releaseSoundPool(); } }