ListViewActivity.kt

package com.example.myapplication

import android.os.Bundle
import android.util.Log
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.BaseAdapter
import android.widget.ListView
import android.widget.TextView
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity

class ListViewActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_list_view)

        val carList = ArrayList<CarForList>()
        for (i in 0 until 50) {
            carList.add(CarForList("" + i + " 번째 자동차", "" + i + "순위 엔진"))

        }
        val adapter = ListViewAdapter(carList, LayoutInflater.from(this@ListViewActivity))
        val listview : ListView = findViewById(R.id.listview)
        listview.adapter = adapter
        listview.setOnItemClickListener { parent, view, position, id ->
            val carName = (adapter.getItem(position) as CarForList).name
            val carEngine = (adapter.getItem(position) as CarForList).engine

            Toast.makeText(this@ListViewActivity, carName + "" + carEngine, Toast.LENGTH_SHORT ).show()

        }

    }
}

class ListViewAdapter(
    val carForList : ArrayList<CarForList>,
    val layoutInflater: LayoutInflater
) : BaseAdapter() {
    override fun getCount(): Int {
        // 그리고자 하는 아이템 리스트의 전체 갯수
        return carForList.size
    }

    override fun getItem(position: Int): Any {
        // 그리고자 하는 아이템 리스트의 하나 (포지션에 해당하는)
        return carForList.get(position)
    }

    override fun getItemId(position: Int): Long {
        // 해당 포지션에 위치해 있는 아이템뷰의 아이디 설정
        return position.toLong()
    }

    override fun getView(position: Int, convertView: View?, parent: ViewGroup?): View {

        val view : View
        val holder : ViewHolder

        if (convertView == null) {
            Log.d("convert", "1")
            view = layoutInflater.inflate(R.layout.item_view, null)
            holder = ViewHolder()

            holder.carName = view.findViewById(R.id.car_name)
            holder.carEngine = view.findViewById(R.id.car_engine)

            view.tag = holder
        }else {
            Log.d("convert", "2")
            holder = convertView.tag as ViewHolder
            view = convertView
        }
        holder.carName?.setText(carForList.get(position).name)
        holder.carEngine?.setText(carForList.get(position).engine)
        return view

    }

}

class ViewHolder{
    var carName : TextView? = null
    var carEngine : TextView? = null

}