"할일관리 어플" #2 recyclerview

//MainActivity.kt

class MainActivity : AppCompatActivity() {
    private lateinit var binding: ActivityMainBinding //viewBinder

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        //viewBinder setting
        binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)

        //recyclerview setting
        setupRecyclerview()
    }

    private fun setupRecyclerview(){
        binding.contentMain.mainRecyclerView.apply {
            layoutManager = LinearLayoutManager(context)
            adapter = CustomAdapter(createDayToDoList()){dayToDo, position ->
                Toast.makeText(
                    this@MainActivity,
                    "item${dayToDo.subCategory} 클릭",
                    Toast.LENGTH_SHORT
                ).show()
            }
        }
    }

    private fun createDayToDoList() : ArrayList<DayToDo>{ //test Data
        return arrayListOf<DayToDo>(
            DayToDo(
                "대단원1",
                "소단원1",
                false
            ),DayToDo(
                "대단원1",
                "소단원2",
                true
            ),DayToDo(
                "대단원2",
                "소단원3",
                false
            ),DayToDo(
                "대단원3",
                "소단원4",
                false
            ),DayToDo(
                "대단원3",
                "소단원4",
                false
            ),DayToDo(
                "대단원3",
                "소단원4",
                false
            ),DayToDo(
                "대단원3",
                "소단원4",
                false
            )
        )
    }
}

//CustomAdapter.kt

class DayToDo (var mainCategory: String, var subCategory: String, var isDone:Boolean)

class CustomAdapter (//main(일별) recyclerivew
    private val dayToDoList: ArrayList<DayToDo>,
    private val listener: (DayToDo,Int)->Unit //클릭이벤트 처리
) :
    RecyclerView.Adapter<CustomAdapter.ViewHolder>(){

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder { //recyclerview 생성시 호출
        val v = MainListItemBinding.inflate(LayoutInflater.from(parent.context),parent,false)
        return ViewHolder(v)
    }

    override fun onBindViewHolder(holder: ViewHolder, position: Int) { //특정 position의 데이터를 bind하기 위해 호출
        holder.bindItem(dayToDoList[position])
        holder.itemView.setOnClickListener{
            listener(dayToDoList[position],position)
        }
    }

    override fun getItemCount(): Int { //recyclerview 아이탬 개수를 얻기위해 호출
        return dayToDoList.size
    }

    class ViewHolder(var listItemBinding: MainListItemBinding) : //recyclerview의 한 아이탬을 대변함
            RecyclerView.ViewHolder(listItemBinding.root){
                fun bindItem(todo : DayToDo){
                    listItemBinding.mainItemCheck.setChecked(todo.isDone)
                    listItemBinding.mainItemTxtMainCategory.setText(todo.mainCategory)
                    listItemBinding.mainItemTxtSubCategory.setText(todo.subCategory)
                }
            }
    }

<!-- content_main.xml -->
<androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/background"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/purple_200">

        <TextView
            android:id="@+id/main_txt_date"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginLeft="16dp"
            android:layout_marginTop="8dp"
            android:layout_marginBottom="8dp"
            android:text="@string/main_txt_date"
            android:textColor="@color/white"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <TextView
            android:id="@+id/main_txt_complete"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="8dp"
            android:layout_marginEnd="8dp"
            android:layout_marginRight="8dp"
            android:layout_marginBottom="8dp"
            android:text="@string/main_txt_complete"
            android:textColor="@color/white"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toStartOf="@+id/main_txt_listSize"
            app:layout_constraintTop_toTopOf="parent" />

        <TextView
            android:id="@+id/main_txt_listSize"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="8dp"
            android:layout_marginEnd="16dp"
            android:layout_marginRight="16dp"
            android:layout_marginBottom="8dp"
            android:text="@string/main_txt_listSize"
            android:textColor="@color/white"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

참고

https://tutorialwing.com/android-recyclerview-using-kotlin-with-example/

Android RecyclerView Using Kotlin With Example - Tutorialwing

https://developer.android.com/jetpack/androidx/releases/recyclerview

RecyclerView  |  Android 개발자  |  Android Developers