Read contacts and display it in a recyclerview in Kotlin

Question

I am trying to read contacts from ContactsContract in Kotin. But it's not showing any of the contact in the recyclerview. The noticeable thing is that the java version of this code is working fine.

So, I here is my Kotlin code for reading the contact:

private var adapter: ContactsAdapter? = null
private var myContacts : MutableList<MyContacts> = ArrayList()

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)

    // code for recyclerview and adapter and checkPermission
    val itemDecoration = DividerItemDecoration(this, DividerItemDecoration.VERTICAL)
    recycler_view.layoutManager = LinearLayoutManager(this)
    recycler_view.addItemDecoration(itemDecoration)
    adapter = ContactsAdapter(myContacts)
    recycler_view.hasFixedSize()
    recycler_view.adapter = ContactsAdapter(myContacts)

    checkPermission()
}

private fun loadContactFromProvider() {
    showProgressBar()
    val contentResolver = contentResolver
    val cursor = contentResolver.query(CONTENT_URI, null, null, null, DISPLAY_NAME)

    if (cursor != null && cursor.count > 0) {
        while (cursor.moveToNext()) {
            val id = cursor.getString(cursor.getColumnIndex(ID))
            val name = cursor.getString(cursor.getColumnIndex(DISPLAY_NAME))
            val hasPhoneNumber = cursor.getInt(cursor.getColumnIndex(HAS_PHONE_NUMBER))
            val contacts = MyContacts()

            if (hasPhoneNumber > 0) {
                contacts.contactName = name
                val phoneCursor = contentResolver.query(PHONE_URI, arrayOf(NUMBER), "$PHONE_ID = ?", arrayOf(id), null)
                val phoneNumbers = ArrayList<String>()
                phoneCursor!!.moveToFirst()
                while (!phoneCursor.isAfterLast) {
                    val phoneNumber = phoneCursor.getString(phoneCursor.getColumnIndex(NUMBER)).replace(" ", "")
                    phoneNumbers.add(phoneNumber)
                    phoneCursor.moveToNext()
                }
                contacts.contactNumber = phoneNumbers
                phoneCursor.close()
            }
            val inputStream = ContactsContract.Contacts.openContactPhotoInputStream(contentResolver, ContentUris.withAppendedId(CONTENT_URI, id.toLong()))
            if (inputStream != null) {
                val bitmap = BitmapFactory.decodeStream(inputStream)
                contacts.contactImage = bitmap?.toString()
            } else {
                contacts.contactImage = vectorDrawableToBitmap(R.drawable.ic_person)?.toString()
            }

            log(contacts.contactName + " " + contacts.contactNumber.toString() + " " + contacts.contactImage.toString())
            myContacts.add(contacts)
        }
        adapter?.notifyDataSetChanged()
        cursor.close()
    }
}

The log details are also fine, they are showing the full contact list. But I am unable to see it in the recyclerview. The constant field like ID, DISPLAY_NAME etc. are already defined in the companion object.

Kotlin code for RecyclerViewAdapter is:

class ContactsAdapter(private val contactList: MutableList<MyContacts>): RecyclerView.Adapter<ContactsAdapter.ContactViewHolder>() {

override fun onCreateViewHolder(viewGroup: ViewGroup, position: Int): ContactViewHolder {
    val view = LayoutInflater.from(viewGroup.context).inflate(R.layout.contact_item_layout,viewGroup,false)
    return ContactViewHolder(view)
}

override fun onBindViewHolder(holder: ContactViewHolder, position: Int) {
    val contact = contactList[position]
    holder.name!!.text = contact.contactName
    holder.mobile!!.text = contact.contactNumber[0]
    Glide.with(holder.itemView.context)
            .load(contact.contactImage)
            .into(holder.image)
}

override fun getItemCount(): Int = contactList.size

class ContactViewHolder(itemView: View): RecyclerView.ViewHolder(itemView){
    var image : ImageView = itemView.find(R.id.contact_image) as ImageView
    var name : TextView? = itemView.find(R.id.contact_name) as TextView
    var mobile : TextView? = itemView.find(R.id.contact_mobile) as TextView
}

}

Any help would be appreciated.

Thankyou