TestAdapter.kt

class TestListAdapter(private val context: Context) : RecyclerView.Adapter<TestListAdapter.ViewHolder>(){
    
    private val data: MutableList<TestModel> = mutableListOf()
    
    override fun getItemCount(): Int = data.count()
    
    override fun onCreateViewHolder(parent: ViewGroup, p1: Int): ViewHolder {
        val view = LayoutInflater.from(context).inflate(R.layout.list_Test, parent ,false)
        return ViewHolder(view)
    }
    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        holder.bindItem(data[position])
    }
    
    /* Method to update adapter data */
    private fun update(d: List<TestModel>){
        data.addAll(d)
        notifyDataSetChanged()
    }
    
    class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
        fun bindItem(test: TestModel){
            //var name: TextView = itemView.findViewById<TextView>(R.id.CatName)
            //name.text = test.name
            // you don't need to make findViewById
            itemView.CatName.text = test.name // <- just do this
        }
    }
    
}