Read Data From Firestore

ReadDataFromFirestore

private fun readDataFromFirestore(){
        mFirestore = FirebaseFirestore.getInstance()
        mFirestore.firestoreSettings = FirebaseFirestoreSettings.Builder().build()

        mFirestore
                .collection("student_info").document("student_list")
                .get()
                .addOnSuccessListener { document ->
                    try {
                        if (document != null) {
                            studentInfo = document.toObject(StudentInfo::class.java) ?: StudentInfo()

                            initListView()
                            Toast.makeText(mContext, "DocumentSnapshot read successfully!", Toast.LENGTH_LONG).show()
                        } else {
                            Toast.makeText(mContext, "No such document!", Toast.LENGTH_LONG).show()
                        }
                    }catch (ex: Exception){
                        Log.e(TAG, ex.message)
                    }
                }.addOnFailureListener {
                    e -> Log.e(TAG, "Error writing document", e)
                }
    }

what is initlistview()?
can you add initlistview code..?