code: @TargetApi(VERSION_CODES.O)
    public void setActivePlaybackConfigurationsFor(List<AudioAttributes> audioAttributes) {
      activePlaybackConfigurations = new ArrayList<>(audioAttributes.size());
      for (AudioAttributes audioAttribute : audioAttributes) {
        Parcel p = Parcel.obtain();
        p.writeInt(0); // mPlayerIId
        p.writeInt(0); // mPlayerType
        p.writeInt(0); // mClientUid
        p.writeInt(0); // mClientPid
        p.writeInt(AudioPlaybackConfiguration.PLAYER_STATE_STARTED); // mPlayerState
        audioAttribute.writeToParcel(p, 0);
        p.writeStrongInterface(null);
        byte[] bytes = p.marshall();
        p.recycle();
        p = Parcel.obtain();
        p.unmarshall(bytes, 0, bytes.length);
        p.setDataPosition(0);
        AudioPlaybackConfiguration configuration =
            AudioPlaybackConfiguration.CREATOR.createFromParcel(p);
        p.recycle();
        activePlaybackConfigurations.add(configuration);
      }
    }
docs: Sets active playback configurations that will be served by {@link
  AudioManager#getActivePlaybackConfigurations}.
  
  <p>Note that there is no public {@link AudioPlaybackConfiguration} constructor, so the
  configurations returned are specified by their audio attributes only.