Method to create an image file on an Android device.

ImageFragment.kt

private fun createImageFile(filename: String): File? {
        val storageDir: File? = getExternalFilesDir(Environment.DIRECTORY_PICTURES)
        return File.createTempFile(
            filename, /* name */
            null, /* suffix can be null */
            storageDir /* directory */
        ).apply {
            // Save a file: path for use with ACTION_VIEW intents
            currentPhotoPath = absolutePath
        }
    }