NearbyConnectionsWalkieTalkie/app/src/automatic/java/com/google/location/nearby/apps/walkietalkie/MainActivity.java [111:127]:
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  private final GestureDetector mGestureDetector =
      new GestureDetector(KeyEvent.KEYCODE_VOLUME_DOWN, KeyEvent.KEYCODE_VOLUME_UP) {
        @Override
        protected void onHold() {
          logV("onHold");
          startRecording();
        }

        @Override
        protected void onRelease() {
          logV("onRelease");
          stopRecording();
        }
      };

  /** For recording audio as the user speaks. */
  @Nullable private AudioRecorder mRecorder;
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NearbyConnectionsWalkieTalkie/app/src/manual/java/com/google/location/nearby/apps/walkietalkie/MainActivity.java [118:134]:
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  private final GestureDetector mGestureDetector =
      new GestureDetector(KeyEvent.KEYCODE_VOLUME_DOWN, KeyEvent.KEYCODE_VOLUME_UP) {
        @Override
        protected void onHold() {
          logV("onHold");
          startRecording();
        }

        @Override
        protected void onRelease() {
          logV("onRelease");
          stopRecording();
        }
      };

  /** For recording audio as the user speaks. */
  @Nullable private AudioRecorder mRecorder;
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