NearbyConnectionsWalkieTalkie/app/src/manual/java/com/google/location/nearby/apps/walkietalkie/MainActivity.java [577:591]:
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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);
    }
  }
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NearbyConnectionsWalkieTalkie/app/src/automatic/java/com/google/location/nearby/apps/walkietalkie/MainActivity.java [484:498]:
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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);
    }
  }
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