Fetch pic data from Firebase

fetchPic.java

private fun poplulateViews(picId: String) {
    picReference = FirebaseFirestore.getInstance().collection("pics").document(picId)
    picReference.get()
        .addOnSuccessListener(this) { snap ->
            if (snap.exists()) {
                val ring = snap.toObject(Pic::class.java)
                val ref = FirebaseStorage.getInstance().getReference(pic.imagePath!!)
                Glide.with(this@AnswerPicActivity).load(ref).into(ivGuest)
            }
        }
        .addOnFailureListener(this) { e ->
            Log.e(TAG, "Cannot fetch pic $picId", e)
        }
}