getContacts.kt

class PhoneContactModel {

    var id: Int = 0
    var name: String = ""
    var number: String = ""
    var isSelected: Boolean = false
    var viewType: Int = 1
    var headerName = ""
}



private fun loadContacts() {

        val contentUri = ContactsContract.Contacts.CONTENT_URI
        val id = ContactsContract.Contacts._ID
        val displayName = ContactsContract.Contacts.DISPLAY_NAME
        val hasPhoneNumber = ContactsContract.Contacts.HAS_PHONE_NUMBER

        val phoneContentUri = ContactsContract.CommonDataKinds.Phone.CONTENT_URI
        val phoneContactId = ContactsContract.CommonDataKinds.Phone.CONTACT_ID
        val number = ContactsContract.CommonDataKinds.Phone.NUMBER
        val cursor = contentResolver.query(contentUri, null, null, null, null)

        if (cursor.count > 0 && cursor.moveToFirst()) {

            while (!cursor.isAfterLast) {
                val contactId = cursor.getString(cursor.getColumnIndex(id))
                val name = cursor.getString(cursor.getColumnIndex(displayName))

                val hasNumber = Integer.parseInt(cursor.getString(cursor.getColumnIndex(hasPhoneNumber)))
                if (hasNumber > 0) {
                    val model = PhoneContactModel()
                    model.name = name

                    //This is to read multiple phone numbers associated with the same contact
                    val phoneCursor = contentResolver.query(phoneContentUri, null, phoneContactId + " = ?", arrayOf(contactId), null)
                    while (phoneCursor.moveToNext()) {
                        val phoneNumber = phoneCursor.getString(phoneCursor.getColumnIndex(number))
                        model.number = phoneNumber
                    }
                    model.isSelected = false
                    items.add(model)
                    phoneCursor.close()
                }
                cursor.moveToNext()
            }

            cursor.close()
            inviteContactAdapter.notifyDataSetChanged()
            if (items.size > 0) {
                startActivity(Intent(this, InvitationsActivity::class.java))
                finish()
            } else {
                Utils.infoDialog(this, "", getString(R.string.contacts_not_found), false)
            }
        } else {
            Utils.infoDialog(this, "", getString(R.string.contacts_not_found), false)
        }
    }