How to set default card without any selection - kotlin

Question

I am developing e-commerce app in which users can set multiple options for address. Which by default they have to select every time. Each address have a separate address id which helps in identification of address selected. To reduce extra click of users i want to make first address i.e. address id present on position 0 as default selected address. Different address are present in different material card view so you can easily select one of them. My app screen shot is present as below.
enter image description here
My code is as following
import android.content.Context
import android.util.Log
import android.util.TypedValue
import android.view.LayoutInflater
import android.view.ViewGroup
import androidx.recyclerview.widget.RecyclerView
import com.google.android.material.card.MaterialCardView
import com.sbhs.stone.R
import com.sbhs.stone.data.UserData
import com.sbhs.stone.databinding.LayoutAddressCardBinding
import com.sbhs.stone.ui.getCompleteAddress
private const val TAG = "AddressAdapter"
class AddressAdapter(
private val context: Context,
addresses: List<UserData.Address>,
private val isSelect: Boolean,
) :
RecyclerView.Adapter<AddressAdapter.ViewHolder>() {
lateinit var onClickListener: OnClickListener
var data: List<UserData.Address> = addresses
var lastCheckedAddress: String? = null
private var lastCheckedCard: MaterialCardView? = null
var selectedAddressPos = -1
inner class ViewHolder(private var binding: LayoutAddressCardBinding) :
RecyclerView.ViewHolder(binding.root) {
fun bind(address: UserData.Address, position: Int) {
binding.addressCard.isChecked = position == selectedAddressPos
binding.addressPersonNameTv.text =
context.getString(R.string.person_name, address.fName, address.lName)
binding.addressCompleteAddressTv.text = getCompleteAddress(address)
binding.addressMobileTv.text = address.phoneNumber
if (isSelect) {
binding.addressCard.setOnClickListener {
onCardClick(position, address.addressId, it as MaterialCardView)
}
}
//binding.addressCard.setOnFocusChangeListener { view: View, b: Boolean ->
// onCardClick(0, address.addressId, 0 as MaterialCardView)
//}
binding.addressEditBtn.setOnClickListener {
onClickListener.onEditClick(address.addressId)
}
binding.addressDeleteBtn.setOnClickListener {
onClickListener.onDeleteClick(address.addressId)
notifyDataSetChanged()
}
}
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
return ViewHolder(
LayoutAddressCardBinding.inflate(
LayoutInflater.from(parent.context),
parent,
false
)
)
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
holder.bind(data[position], position)
}
override fun getItemCount(): Int = data.size
interface OnClickListener {
fun onEditClick(addressId: String)
fun onDeleteClick(addressId: String)
}
private fun onCardClick(position: Int, addressTd: String, card: MaterialCardView) {
if (addressTd != lastCheckedAddress) {
card.apply {
strokeColor = context.getColor(R.color.blue_accent_300)
isChecked = true
strokeWidth = TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_DIP,
2F,
resources.displayMetrics
).toInt()
}
lastCheckedCard?.apply {
strokeColor = context.getColor(R.color.light_gray)
isChecked = false
strokeWidth = TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_DIP,
1F,
resources.displayMetrics
).toInt()
}
lastCheckedAddress = addressTd
lastCheckedCard = card
selectedAddressPos = position
Log.d(TAG, "onCardClick: selected address = $addressTd")
}
}
}
So in above code i want to make selectedAddressPos = 0, & last checked Address as addressTd of address present on position 0. Remember my address can be null so this condition should only applied when address is non-null. Please help me i am new in coding. The information about user address are stored in firebase. so i cant make any card as default from xml.
I tried to make selectedAddressPos as 0 at time of initiation but it will only show it in app and no address id is taken.