[refactor] 운동모아보기 뷰 listadapter로 변경

app/src/main/java/sopt/motivoo/presentation/exercise/ExerciseAdapter.kt

@@ -2,15 +2,14 @@ package sopt.motivoo.presentation.exercise
 
 import android.view.LayoutInflater
 import android.view.ViewGroup
+import androidx.recyclerview.widget.DiffUtil
+import androidx.recyclerview.widget.ListAdapter
 import androidx.recyclerview.widget.RecyclerView
 import sopt.motivoo.databinding.ItemExerciseBinding
 import sopt.motivoo.databinding.ItemExerciseNoticeBinding
 import sopt.motivoo.domain.entity.exercise.ExerciseData.ExerciseItemInfo
 
-class ExerciseAdapter(private val userType: String) :
-    RecyclerView.Adapter<RecyclerView.ViewHolder>() {
-    private var exerciseItemInfoList: List<ExerciseItemInfo> = emptyList()
-
+class ExerciseAdapter(private val userType: String) : ListAdapter<ExerciseItemInfo, RecyclerView.ViewHolder>(diffUtil) {
     override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
         val inflater = LayoutInflater.from(parent.context)
         return when (viewType) {
@@ -29,33 +28,42 @@ class ExerciseAdapter(private val userType: String) :
     override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
         when (holder) {
             is ExerciseNoticeViewHolder -> {
-                val noticeInfo = exerciseItemInfoList[position]
+                val noticeInfo = currentList[position]
                 holder.onBind(noticeInfo as ExerciseItemInfo.NoticeItemInfo)
             }
 
             is ExerciseEachDateInfoViewHolder -> {
-                val dateExerciseInfo = exerciseItemInfoList[position]
+                val dateExerciseInfo = currentList[position]
                 holder.onBind(dateExerciseInfo as ExerciseItemInfo.EachDateItemInfo, userType)
             }
         }
     }
 
     override fun getItemViewType(position: Int): Int {
-        return when (exerciseItemInfoList[position]) {
+        return when (currentList[position]) {
             is ExerciseItemInfo.NoticeItemInfo -> NOTICE_INFO_TYPE
             is ExerciseItemInfo.EachDateItemInfo -> DATE_EXERCISE_INFO_TYPE
         }
     }
 
-    override fun getItemCount() = exerciseItemInfoList.size
-
-    fun updateItemList(exerciseList: List<ExerciseItemInfo>) {
-        this.exerciseItemInfoList = exerciseList.toList()
-        notifyDataSetChanged()
-    }
-
     companion object {
         const val NOTICE_INFO_TYPE = 0
         const val DATE_EXERCISE_INFO_TYPE = 1
+
+        val diffUtil = object : DiffUtil.ItemCallback<ExerciseItemInfo>() {
+            override fun areItemsTheSame(
+                oldItem: ExerciseItemInfo,
+                newItem: ExerciseItemInfo
+            ): Boolean {
+                return oldItem == newItem
+            }
+
+            override fun areContentsTheSame(
+                oldItem: ExerciseItemInfo,
+                newItem: ExerciseItemInfo
+            ): Boolean {
+                return oldItem == newItem
+            }
+        }
     }
 }

app/src/main/java/sopt/motivoo/presentation/exercise/ExerciseFragment.kt

@@ -79,7 +79,9 @@ class ExerciseFragment : BindingFragment<FragmentExerciseBinding>(R.layout.fragm
 
     private fun initAdapter(exerciseData: ExerciseData) {
         val adapter = ExerciseAdapter(userType = exerciseData.userType)
-        adapter.updateItemList(exerciseList = exerciseData.exerciseItemInfoList)
+        exerciseViewModel.exerciseHistoryInfoList.observe(binding.lifecycleOwner!!) {
+            adapter.submitList(it.toMutableList())
+        }
         binding.rvExerciseEachDateExercise.adapter = adapter
     }
 

app/src/main/java/sopt/motivoo/presentation/exercise/ExerciseViewModel.kt

@@ -19,6 +19,11 @@ class ExerciseViewModel @Inject constructor(
     private val networkRepository: NetworkRepository,
 ) : ViewModel() {
 
+    private val _exerciseHistoryInfoList = ArrayList<ExerciseData.ExerciseItemInfo>()
+    val exerciseHistoryInfoList: MutableLiveData<ArrayList<ExerciseData.ExerciseItemInfo>> by lazy {
+        MutableLiveData<ArrayList<ExerciseData.ExerciseItemInfo>>()
+    }
+
     private val _exerciseHistoryInfo = MutableLiveData<UiState<ExerciseData>>(UiState.Loading)
     val exerciseHistoryInfo: LiveData<UiState<ExerciseData>> = _exerciseHistoryInfo