capture.kt

 private fun capture() {
        // Create output file to hold the image
        val photoFile = createFile(outputFolder, FILENAME, PHOTO_EXTENSION)

        // Create output options object which contains file + metadata
        val outputOptions = ImageCapture.OutputFileOptions.Builder(photoFile)
            .build()

        imageCapture.takePicture(outputOptions, Executors.newSingleThreadExecutor(),
            object : ImageCapture.OnImageSavedCallback {
                override fun onImageSaved(output: ImageCapture.OutputFileResults) {
                    captureFileUri = output.savedUri ?: Uri.fromFile(photoFile)
                    Log.d(TAG, "Photo capture succeeded: $captureFileUri")
                }
                override fun onError(exception: ImageCaptureException) {
                    Log.e(TAG, "Photo capture exception: $exception")
                }
            })
    }