NearbyConnectionsWalkieTalkie/app/src/automatic/java/com/google/location/nearby/apps/walkietalkie/MainActivity.java [484:548]:
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  private void startRecording() {
    logV("startRecording()");
    try {
      ParcelFileDescriptor[] payloadPipe = ParcelFileDescriptor.createPipe();

      // Send the first half of the payload (the read side) to Nearby Connections.
      send(Payload.fromStream(payloadPipe[0]));

      // Use the second half of the payload (the write side) in AudioRecorder.
      mRecorder = new AudioRecorder(payloadPipe[1]);
      mRecorder.start();
    } catch (IOException e) {
      logE("startRecording() failed", e);
    }
  }

  /** Stops streaming sound from the microphone. */
  private void stopRecording() {
    logV("stopRecording()");
    if (mRecorder != null) {
      mRecorder.stop();
      mRecorder = null;
    }
  }

  /** @return True if currently streaming from the microphone. */
  private boolean isRecording() {
    return mRecorder != null && mRecorder.isRecording();
  }

  /** {@see ConnectionsActivity#getRequiredPermissions()} */
  @Override
  protected String[] getRequiredPermissions() {
    return join(
        super.getRequiredPermissions(),
        Manifest.permission.RECORD_AUDIO);
  }

  /** Joins 2 arrays together. */
  private static String[] join(String[] a, String... b) {
    String[] join = new String[a.length + b.length];
    System.arraycopy(a, 0, join, 0, a.length);
    System.arraycopy(b, 0, join, a.length, b.length);
    return join;
  }

  /**
   * Queries the phone's contacts for their own profile, and returns their name. Used when
   * connecting to another device.
   */
  @Override
  protected String getName() {
    return mName;
  }

  /** {@see ConnectionsActivity#getServiceId()} */
  @Override
  public String getServiceId() {
    return SERVICE_ID;
  }

  /** {@see ConnectionsActivity#getStrategy()} */
  @Override
  public Strategy getStrategy() {
    return STRATEGY;
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NearbyConnectionsWalkieTalkie/app/src/manual/java/com/google/location/nearby/apps/walkietalkie/MainActivity.java [577:641]:
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  private void startRecording() {
    logV("startRecording()");
    try {
      ParcelFileDescriptor[] payloadPipe = ParcelFileDescriptor.createPipe();

      // Send the first half of the payload (the read side) to Nearby Connections.
      send(Payload.fromStream(payloadPipe[0]));

      // Use the second half of the payload (the write side) in AudioRecorder.
      mRecorder = new AudioRecorder(payloadPipe[1]);
      mRecorder.start();
    } catch (IOException e) {
      logE("startRecording() failed", e);
    }
  }

  /** Stops streaming sound from the microphone. */
  private void stopRecording() {
    logV("stopRecording()");
    if (mRecorder != null) {
      mRecorder.stop();
      mRecorder = null;
    }
  }

  /** @return True if currently streaming from the microphone. */
  private boolean isRecording() {
    return mRecorder != null && mRecorder.isRecording();
  }

  /** {@see ConnectionsActivity#getRequiredPermissions()} */
  @Override
  protected String[] getRequiredPermissions() {
    return join(
        super.getRequiredPermissions(),
        Manifest.permission.RECORD_AUDIO);
  }

  /** Joins 2 arrays together. */
  private static String[] join(String[] a, String... b) {
    String[] join = new String[a.length + b.length];
    System.arraycopy(a, 0, join, 0, a.length);
    System.arraycopy(b, 0, join, a.length, b.length);
    return join;
  }

  /**
   * Queries the phone's contacts for their own profile, and returns their name. Used when
   * connecting to another device.
   */
  @Override
  protected String getName() {
    return mName;
  }

  /** {@see ConnectionsActivity#getServiceId()} */
  @Override
  public String getServiceId() {
    return SERVICE_ID;
  }

  /** {@see ConnectionsActivity#getStrategy()} */
  @Override
  public Strategy getStrategy() {
    return STRATEGY;
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