[코틀린코드연습장] RecycleView 뭐에다 쓰는건가

listView를 대신할 목적으로 RecycleView를 쓰라고 하는데,영 귀찮은게 많다. 

네이버를 좀 찾아서 찾긴했는데, 

초보자에게는 영 헤깔리는 부분이 많다. 

최대한 간결하게 작성한 코드이다. 

[메인액티비티.kt]

class MainActivity : AppCompatActivity() {
    
    data class Color(val name: String, val food: String, val photo: String)

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        var colorList = arrayListOf<Color>(
                Color("RED", "Like Strawberry", "red"),
                Color("Blue", "Like SkyCake", "blue"),
                Color("Purple", "Like Grape", "purple")
        )

        var adapter = Adapter(this, colorList) {color ->  
            Toast.makeText(this, "선택한 색상은 ${color.name}이고, 이 색상의 과일은 ${color.food}입니다.",Toast.LENGTH_SHORT).show()
        }
        recycleView.adapter = adapter

        var lm = LinearLayoutManager(this)
        recycleView.layoutManager = lm
        recycleView.setHasFixedSize(true)
    }
}

[아답터.kt]

class Adapter(val context : Context, val colorList : ArrayList<MainActivity.Color>,
              val itemClick : (MainActivity.Color) -> Unit) : RecyclerView.Adapter<Adapter.Holder>() {

    override fun getItemCount(): Int {
        return colorList.size
    }

    override fun onCreateViewHolder(p0: ViewGroup, p1: Int): Holder {
        var view = LayoutInflater.from(context).inflate(R.layout.recycle_layout, null)
        return Holder(view, itemClick)
    }

    override fun onBindViewHolder(p0: Holder, p1: Int) {
        p0?.bind(colorList[p1], context)
    }

    inner class Holder(itemView: View?, itemClick: (MainActivity.Color) -> Unit) : RecyclerView.ViewHolder(itemView!!){
        val txt1 = itemView?.findViewById<TextView>(R.id.textView2)
        val txt2 = itemView?.findViewById<TextView>(R.id.textView3)
        val image = itemView?.findViewById<ImageView>(R.id.imageView)

        fun bind(colorList: MainActivity.Color, context: Context) {

            var imageID = context.resources.getIdentifier(colorList.photo, "drawable", context.packageName)
            image?.setImageResource(imageID)
            txt1?.text = colorList.name
            txt2?.text = colorList.food

            itemView?.setOnClickListener { itemClick(colorList) }
        }
    }
}