private void init()

in react-native-pytorch-core/android/src/main/java/org/pytorch/rn/core/camera/CameraView.java [82:170]
68 lines of code
5 McCabe index (conditional complexity)

  private void init() {
    cameraProviderFuture = ProcessCameraProvider.getInstance(mReactContext.getCurrentActivity());

    // Initialize our background executor
    cameraExecutor = Executors.newSingleThreadExecutor();

    View mLayout = inflate(mReactContext, R.layout.activity_camera, this);

    mPreviewView = mLayout.findViewById(R.id.preview_view);
    mCaptureButton = mLayout.findViewById(R.id.capture_button);
    mFlipButton = mLayout.findViewById(R.id.flip_button);

    // Initialize drawables to change (inner circle stroke)
    mCaptureButtonLayerDrawable =
        (LayerDrawable)
            mReactContext
                .getResources()
                .getDrawable(R.drawable.camera_button, mReactContext.getTheme())
                .mutate();
    mCaptureButtonInnerCircle =
        (GradientDrawable)
            mCaptureButtonLayerDrawable.findDrawableByLayerId(R.id.camera_button_inner_circle);

    // Calculate pixel values of borders
    float density = mReactContext.getResources().getDisplayMetrics().density;
    int cameraButtonInnerBorderNormal = (int) (density * 18);
    int cameraButtonInnerBorderPressed = (int) (density * 24);

    // Initialize Value Animators and Listeners
    // grow means grow border so the circle shrinks
    pressAnimation =
        ValueAnimator.ofInt(cameraButtonInnerBorderNormal, cameraButtonInnerBorderPressed)
            .setDuration(DURATION);
    releaseAnimation =
        ValueAnimator.ofInt(cameraButtonInnerBorderPressed, cameraButtonInnerBorderNormal)
            .setDuration(DURATION);

    ValueAnimator.AnimatorUpdateListener animatorUpdateListener =
        new ValueAnimator.AnimatorUpdateListener() {
          @Override
          public void onAnimationUpdate(ValueAnimator updatedAnimation) {
            int animatedValue = (int) updatedAnimation.getAnimatedValue();
            mCaptureButtonInnerCircle.setStroke(animatedValue, Color.TRANSPARENT);
            mCaptureButton.setBackground(mCaptureButtonLayerDrawable);
          }
        };

    pressAnimation.addUpdateListener(animatorUpdateListener);
    releaseAnimation.addUpdateListener(animatorUpdateListener);

    mCaptureButton.setOnTouchListener(
        (v, e) -> {
          switch (e.getAction()) {
            case MotionEvent.ACTION_DOWN:
              pressAnimation.start();
              mCaptureButton.animate().scaleX(SCALE_BUTTON_BY).setDuration(DURATION);
              mCaptureButton.animate().scaleY(SCALE_BUTTON_BY).setDuration(DURATION);
              takePicture();
              break;
            case MotionEvent.ACTION_UP:
              releaseAnimation.start();
              mCaptureButton.animate().scaleX(1f).setDuration(DURATION);
              mCaptureButton.animate().scaleY(1f).setDuration(DURATION);
          }
          return false;
        });

    mFlipButton.setOnTouchListener(
        (v, e) -> {
          if (e.getAction() == MotionEvent.ACTION_DOWN) {
            flipCamera();
          }
          return false;
        });

    // The PreviewView has a width/height of 0/0. This was reported as an issue in the CameraX
    // issue tracker and is supposedly a bug in how React Native calculates children dimension.
    // A manual remeasure of the layout fixes this.
    // Link to issue: https://issuetracker.google.com/issues/177245493#comment8
    mPreviewView.setOnHierarchyChangeListener(new CameraView.ReactNativeCameraPreviewRemeasure());

    if (allPermissionsGranted()) {
      startCamera(); // start camera if permission has been granted by user
    } else {
      int REQUEST_CODE_PERMISSIONS = 200;
      ActivityCompat.requestPermissions(
          mReactContext.getCurrentActivity(), REQUIRED_PERMISSIONS, REQUEST_CODE_PERMISSIONS);
    }
  }