音效

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音频效果：
   android.media.audiofx.AudioEffect--》

    Equalizer----均衡器
    Virtualizer---视觉器
    BassBoost-----低音增强
    PresetReverb----混响预置---多在音乐场景中应用--参数包括PRESET_LARGEHALL,PRESET_PLATE,PRESET_LARGEROOM,PRESET_SMALLROOM
    EnvironmentalReverb---环境混响---多在游戏场景中应用--参数包括散射、反射水平、反射延迟、混响延迟

private MediaPlayer mMediaPlayer;
    private Visualizer mVisualizer;
    private Equalizer mEqualizer;

setVolumeControlStream(AudioManager.STREAM_MUSIC);

mMediaPlayer = MediaPlayer.create(this, R.raw.test_cbr);
mMediaPlayer.start();

mEqualizer = new Equalizer(0, mMediaPlayer.getAudioSessionId());
        mEqualizer.setEnabled(true);
//获取均衡器波段数
     short bands = mEqualizer.getNumberOfBands();

        final short minEQLevel = mEqualizer.getBandLevelRange()[0];
        final short maxEQLevel = mEqualizer.getBandLevelRange()[1];

      minEQLevel / 100=>   -15 dB
      maxEQLevel / 100=>    15 dB

//显示频率（中间频率）单位：HZ
  mEqualizer.getCenterFreq(band) / 1000

进度条显示：
     SeekBar bar = new SeekBar(this);
            bar.setLayoutParams(layoutParams);
            bar.setMax(maxEQLevel - minEQLevel);      //1500-（-1500）=3000
            bar.setProgress(mEqualizer.getBandLevel(band));//当前显示进度
   bar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
                public void onProgressChanged(SeekBar seekBar, int progress,
                        boolean fromUser) {
                    mEqualizer.setBandLevel(band, (short) (progress + minEQLevel));//设置均衡器的值

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