InvoicesAdapter.kt

package com.danielmalone.dansinvoicing

import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.recyclerview.widget.DiffUtil
import androidx.recyclerview.widget.ListAdapter
import androidx.recyclerview.widget.RecyclerView
import kotlinx.android.synthetic.main.invoice_row.view.*

class InvoicesAdapter : ListAdapter<Invoice, InvoicesAdapter.ViewHolder>(InvoicesDiff()) {

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
        val inflater = LayoutInflater.from(parent.context)
        return ViewHolder(inflater.inflate(R.layout.invoice_row, parent, false))
    }

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        holder.bind(getItem(position))
    }

    class ViewHolder(view: View) : RecyclerView.ViewHolder(view) {

        fun bind(invoice: Invoice) {
            itemView.invoiceTitle.text = invoice.title
            itemView.invoiceClient.text = invoice.client
            itemView.invoiceDate.text = invoice.date
        }
    }
}

class InvoicesDiff : DiffUtil.ItemCallback<Invoice>() {

    override fun areItemsTheSame(oldItem: Invoice, newItem: Invoice): Boolean {
        return oldItem.id == newItem.id
    }

    override fun areContentsTheSame(oldItem: Invoice, newItem: Invoice): Boolean {
        return areItemsTheSame(oldItem, newItem)
    }
}