[FIX] 코스 발견 / 내가 그린 코스 업로드 시, 단일 선택만 가능하도록 변경

app/src/main/java/com/runnect/runnect/presentation/discover/pick/DiscoverPickActivity.kt

@@ -71,7 +71,7 @@ class DiscoverPickActivity :
         binding.ivDiscoverPickFinish.setOnClickListener {
             if (it.isActivated) {
                 Intent(this, DiscoverUploadActivity::class.java).apply {
-                    putExtra(EXTRA_UPLOAD_COURSE, viewModel.currentSelectedCourse)
+                    putExtra(EXTRA_UPLOAD_COURSE, viewModel.selectedCourse)
                     startActivity(this)
                 }
                 applyScreenEnterAnimation()
@@ -146,7 +146,7 @@ class DiscoverPickActivity :
             onCourseItemClick = { isSelected, course ->
                 viewModel.apply {
                     updateCourseSelectState(isSelected)
-                    if (isSelected) saveCurrentSelectedCourse(course)
+                    if (isSelected) saveSelectedCourse(course)
                 }
             }
         ).apply {

app/src/main/java/com/runnect/runnect/presentation/discover/pick/DiscoverPickViewModel.kt

@@ -20,12 +20,12 @@ class DiscoverPickViewModel @Inject constructor(
     val courseGetState: LiveData<UiStateV2<List<DiscoverUploadCourse>?>>
         get() = _courseGetState
 
-    private val _courseSelectState = MutableLiveData<Boolean>()
+    private val _courseSelectState = MutableLiveData(false)
     val courseSelectState: LiveData<Boolean>
         get() = _courseSelectState
 
-    private var _currentSelectedCourse = DiscoverUploadCourse(-1, "", "", "")
-    val currentSelectedCourse get() = _currentSelectedCourse
+    private var _selectedCourse = DiscoverUploadCourse(-1, "", "", "")
+    val selectedCourse get() = _selectedCourse
 
     init {
         getMyCourseLoad()
@@ -59,7 +59,7 @@ class DiscoverPickViewModel @Inject constructor(
         _courseSelectState.value = isSelected
     }
 
-    fun saveCurrentSelectedCourse(course: DiscoverUploadCourse) {
-        _currentSelectedCourse = course
+    fun saveSelectedCourse(course: DiscoverUploadCourse) {
+        _selectedCourse = course
     }
 }

app/src/main/java/com/runnect/runnect/presentation/discover/pick/adapter/DiscoverPickAdapter.kt

@@ -1,7 +1,6 @@
 package com.runnect.runnect.presentation.discover.pick.adapter
 
 import android.view.LayoutInflater
-import android.view.View
 import android.view.ViewGroup
 import androidx.recyclerview.widget.ListAdapter
 import androidx.recyclerview.widget.RecyclerView
@@ -12,33 +11,38 @@ import com.runnect.runnect.util.callback.diff.ItemDiffCallback
 class DiscoverPickAdapter(
     private val onCourseItemClick: (Boolean, DiscoverUploadCourse) -> Unit
 ) : ListAdapter<DiscoverUploadCourse, DiscoverPickAdapter.DiscoverPickViewHolder>(diffUtil) {
+    private var selectedPosition = -1
+
     override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): DiscoverPickViewHolder {
         return DiscoverPickViewHolder(
-            binding = ItemDiscoverPickBinding.inflate(
+            ItemDiscoverPickBinding.inflate(
                 LayoutInflater.from(parent.context),
                 parent,
                 false
-            ),
-            onCourseItemClick = onCourseItemClick
+            )
         )
     }
 
     override fun onBindViewHolder(holder: DiscoverPickViewHolder, position: Int) {
-        holder.bind(currentList[position])
+        holder.bind(currentList[position], position)
     }
 
-    class DiscoverPickViewHolder(
-        private val binding: ItemDiscoverPickBinding,
-        private val onCourseItemClick: (Boolean, DiscoverUploadCourse) -> Unit
+    inner class DiscoverPickViewHolder(
+        private val binding: ItemDiscoverPickBinding
     ) : RecyclerView.ViewHolder(binding.root) {
-        fun bind(course: DiscoverUploadCourse) {
+        fun bind(course: DiscoverUploadCourse, position: Int) {
             binding.course = course
-            binding.ivItemDiscoverPickBackground.isSelected = false
 
-            binding.ivItemDiscoverPickBackground.setOnClickListener { view ->
-                view.isSelected = !view.isSelected
-                onCourseItemClick.invoke(view.isSelected, course)
+            binding.ivItemDiscoverPickBackground.setOnClickListener {
+                notifyItemChanged(selectedPosition) // 이전에 선택한 것은 해제
+                selectedPosition = absoluteAdapterPosition
+                notifyItemChanged(selectedPosition) // 새로 선택된 것은 활성화
+
+                onCourseItemClick.invoke(selectedPosition == position, course)
             }
+
+            // 단일 선택된 항목의 배경 활성화
+            binding.ivItemDiscoverPickBackground.isSelected = (selectedPosition == position)
         }
     }