fix : DiffUtil과 ListAdapter 사용 #3

GO-SOPT-ANDROID · Apr 27, 2023 · 209a963 · 209a963
1 parent fb4aa20
commit 209a963
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Showing 2 changed files with 13 additions and 10 deletions.
diff --git a/app/src/main/java/org/android/go/sopt/presentation/main/home/DogAdapter.kt b/app/src/main/java/org/android/go/sopt/presentation/main/home/DogAdapter.kt
@@ -3,15 +3,15 @@ package org.android.go.sopt.presentation.main.home
 import android.content.Context
 import android.view.LayoutInflater
 import android.view.ViewGroup
+import androidx.recyclerview.widget.DiffUtil
+import androidx.recyclerview.widget.ListAdapter
 import androidx.recyclerview.widget.RecyclerView
 import org.android.go.sopt.data.Dog
 import org.android.go.sopt.databinding.ItemDogBinding
 
-class DogAdapter(context: Context) : RecyclerView.Adapter<DogAdapter.DogViewHolder>() {
+class DogAdapter(context: Context) : ListAdapter<Dog, DogAdapter.DogViewHolder>(DogDiffCallback()) {
     private val inflater by lazy { LayoutInflater.from(context) }
 
-    private var dogList: List<Dog> = emptyList()
-
     class DogViewHolder(private val binding: ItemDogBinding) :
         RecyclerView.ViewHolder(binding.root) {
         fun onBind(dog: Dog) {
@@ -26,14 +26,17 @@ class DogAdapter(context: Context) : RecyclerView.Adapter<DogAdapter.DogViewHold
         return DogViewHolder(binding)
     }
 
-    override fun getItemCount(): Int = dogList.size
-
     override fun onBindViewHolder(holder: DogViewHolder, position: Int) {
-        holder.onBind(dogList[position])
+        holder.onBind(getItem(position))
+    }
+}
+
+class DogDiffCallback : DiffUtil.ItemCallback<Dog>() {
+    override fun areItemsTheSame(oldItem: Dog, newItem: Dog): Boolean {
+        return oldItem.name == newItem.name
     }
 
-    fun setDogList(dogList: List<Dog>) {
-        this.dogList = dogList.toList()
-        notifyDataSetChanged()
+    override fun areContentsTheSame(oldItem: Dog, newItem: Dog): Boolean {
+        return oldItem == newItem
     }
 }
diff --git a/app/src/main/java/org/android/go/sopt/presentation/main/home/HomeFragment.kt b/app/src/main/java/org/android/go/sopt/presentation/main/home/HomeFragment.kt
@@ -29,7 +29,7 @@ class HomeFragment : Fragment() {
         super.onViewCreated(view, savedInstanceState)
         val titleAdapter = TitleAdapter(requireContext())
         val dogAdapter = DogAdapter(requireContext())
-        dogAdapter.setDogList(viewModel.mockDogList)
+        dogAdapter.submitList(viewModel.mockDogList)
         binding.rvHomeDog.adapter = ConcatAdapter(titleAdapter, dogAdapter)
     }