Recycler View 사용방법

xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
       />
</LinearLayout>

recyclerview.xml

재사용 되는 화면 정의

AdapterClass.kt

class MyAdapter(val mItems: MutableList<MyItem>) : RecyclerView.Adapter<MyAdapter.Holder>() {

    interface ItemClick {
        fun onClick(view : View, position : Int)
    }

    var itemClick : ItemClick? = null

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): Holder {
        val binding = ItemRecyclerviewBinding.inflate(LayoutInflater.from(parent.context), parent, false)
        return Holder(binding)
    }

    override fun onBindViewHolder(holder: Holder, position: Int) {
        holder.itemView.setOnClickListener {  //클릭이벤트추가부분
            itemClick?.onClick(it, position)
        }
        holder.iconImageView.setImageResource(mItems[position].aIcon)
        holder.name.text = mItems[position].aName
        holder.age.text = mItems[position].aAge
    }

    override fun getItemId(position: Int): Long {
        return position.toLong()
    }

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

    inner class Holder(val binding: ItemRecyclerviewBinding) : RecyclerView.ViewHolder(binding.root) {
        val iconImageView = binding.iconItem
        val name = binding.textItem1
        val age = binding.textItem2
    }
}

MainActivity.kt

class MainActivity : AppCompatActivity() {

    private lateinit var binding: ActivityMainBinding

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)

        // 데이터 원본 준비
        val dataList = mutableListOf<MyItem>()
        dataList.add(MyItem(R.drawable.sample_0, "Bella", "1"))
        dataList.add(MyItem(R.drawable.sample_1, "Charlie", "2"))
        dataList.add(MyItem(R.drawable.sample_2, "Daisy", "1.5"))
        dataList.add(MyItem(R.drawable.sample_3, "Duke", "1"))
        dataList.add(MyItem(R.drawable.sample_4, "Max", "2"))
        dataList.add(MyItem(R.drawable.sample_5, "Happy", "4"))
        dataList.add(MyItem(R.drawable.sample_6, "Luna", "3"))
        dataList.add(MyItem(R.drawable.sample_7, "Bob", "2"))

        binding.recyclerView.adapter = MyAdapter(dataList)

        val adapter = MyAdapter(dataList)
        binding.recyclerView.adapter = adapter
        binding.recyclerView.layoutManager = LinearLayoutManager(this)

        adapter.itemClick = object : MyAdapter.ItemClick {
            override fun onClick(view: View, position: Int) {
                val name: String = dataList[position].aName
                Toast.makeText(this@MainActivity," $name 선택!", Toast.LENGTH_SHORT).show()
            }
        }
    }
}