AutoML_convert_to_bytes.kt

private fun getBytesFromBitmap(bitmap: Bitmap): ByteArray {
        val stream = ByteArrayOutputStream()
        bitmap.compress(CompressFormat.JPEG, 70, stream)
        return stream.toByteArray()
}

val bitmap = MediaStore.Images.Media.getBitmap(this.contentResolver, contentURI)

Toast.makeText(this@MainActivity, "Image Saved!", Toast.LENGTH_SHORT).show()
imageView.setImageBitmap(bitmap)

val imgString = Base64.encodeToString(getBytesFromBitmap(bitmap),Base64.NO_WRAP)