Android Camera2 API Raw Setup

This android tutorial series is about explaining how to do the android camera2 api raw setup. Where the android application will be capturing raw images.

Get Code

This code has been based on the android camera2 api app tutorial series that can be found here

The code to start this tutorial is on github here

https://github.com/mobapptuts/recyclerview_image_gallery.git Tag camera2-write-swap-fix

or you can run this command

git clone –branch camera2-write-swap-fix https://github.com/mobapptuts/recyclerview_image_gallery.git

The code changes will be provided in part 2 of this android tutorial series.

Code Samples

Add helper methods for comparing image size & array mode check

Helper method jpeg & raw image size comparisons

private static class CompareSizeByArea implements Comparator<Size> {

        @Override
        public int compare(Size lhs, Size rhs) {
            return Long.signum((long) lhs.getWidth() * lhs.getHeight() -
                    (long) rhs.getWidth() * rhs.getHeight());
        }
    }

Helper method used to check if a camera mode is supported or not

private static Boolean contains(int[] modes, int mode) {
        if(modes == null) {
            return false;
        }
        for(int i : modes) {
            if(i == mode) {
                return true;
            }
        }
        return false;
    }

Creating folders & files for Raw

Create an activity member for the raw folder

private File mRawGalleryFolder;

Create a file for the captured raw image

private static File mRawImageFile;

Create separate folders for both the jpeg and raw images

private void createImageGallery() {
        File storageDirectory = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
        mGalleryFolder = new File(storageDirectory, "JPEG Images");
        mRawGalleryFolder = new File(storageDirectory, "Raw Images");
        if(!mGalleryFolder.exists()) {
            mGalleryFolder.mkdirs();
        }
        if(!mRawGalleryFolder.exists()) {
            mRawGalleryFolder.mkdirs();
        }
    }

Add a method for creating the file for the raw image

File createRawImageFile() throws IOException {

       String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
       String imageFileName = "RAW_" + timeStamp + "_";

       File image = File.createTempFile(imageFileName, ".dng", mRawGalleryFolder);
       mImageFileLocation = image.getAbsolutePath();

       return image;

   }

CameraCharacteristics setup

Create an activity member for camera characteristics

private CameraCharacteristics mCameraCharacteristics;

Initialise the camera characteristics member inside the setupCamera method

mCameraCharacteristics = cameraCharacteristics;

Create Image Reader & image available listener for capturing raw

Initial configuration inside the setupCamera method

Check the camera device supports raw

if(!contains(cameraCharacteristics.get(CameraCharacteristics.REQUEST_AVAILABLE_CAPABILITIES),
                       CameraCharacteristics.REQUEST_AVAILABLE_CAPABILITIES_RAW)) {
                   continue;
               }

Find the largest raw image size

Size largestRawImageSize = Collections.max(
                        Arrays.asList(map.getOutputSizes(ImageFormat.RAW_SENSOR)),
                        new CompareSizeByArea());

Create a new instance of the image reader & image available listener for the raw images.

mRawImageReader = ImageReader.newInstance(largestRawImageSize.getWidth(),
                        largestRawImageSize.getHeight(),
                        ImageFormat.RAW_SENSOR,
                        1);
                mRawImageReader.setOnImageAvailableListener(mOnRawImageAvailableListener,
                        mBackgroundHandler);

Add the raw image reader surface to the create capture session inside the cameraCreate PreviewSession method

mCameraDevice.createCaptureSession(Arrays.asList(previewSurface, mImageReader.getSurface(),
                            mRawImageReader.getSurface()),

That’s the end of the setup portion of the android camera2 api raw application select here for the capture portion of the android tutorial.