ViewHodlers.kt

class SaleGoodHolder(itemView: View, callback: Callback) : BaseHolder(itemView, callback) {

    @BindView(R.id.sale_item_name)
    lateinit var name: TextView

    @BindView(R.id.sale_item_sale_amount)
    lateinit var saleAmount: TextView

    @BindView(R.id.sale_item_price)
    lateinit var price: TextView

    init {
        unbinder = ButterKnife.bind(this, itemView)
    }

    override fun bindData(data: Good) {
        this.data = data

        name.text = data.name
        saleAmount.text = "${data.saleAmount}"
        price.text = "${data.calculatePrice()}"

        itemView.setOnClickListener {
            callback.onSaleGoodClick(data)
        }
    }
}

class NormalGoodHolder(itemView: View, callback: Callback) : BaseHolder(itemView, callback) {

    @BindView(R.id.normal_item_name)
    lateinit var name: TextView

    @BindView(R.id.normal_item_price)
    lateinit var price: TextView

    init {
        unbinder = ButterKnife.bind(this, itemView)
    }

    override fun bindData(data: Good) {
        this.data = data

        name.text = data.name
        price.text = "${data.price}"

        itemView.setOnClickListener {
            callback.onNormalGoodClick(data)
        }
    }
}