shadows/framework/src/main/java/org/robolectric/shadows/ShadowAudioManager.java
@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);
    }
  }
@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);
    }
  }
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.