do hw

app/src/main/java/ru/otus/cryptosample/coins/feature/CoinListFragment.kt

@@ -11,6 +11,7 @@ import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.lifecycleScope
 import androidx.lifecycle.repeatOnLifecycle
 import androidx.recyclerview.widget.GridLayoutManager
+import androidx.recyclerview.widget.RecyclerView
 import kotlinx.coroutines.launch
 import ru.otus.cryptosample.CoinsSampleApp
 import ru.otus.cryptosample.coins.feature.adapter.CoinsAdapter
@@ -30,6 +31,8 @@ class CoinListFragment : Fragment() {
 
     private lateinit var coinsAdapter: CoinsAdapter
 
+    private val sharedPool = RecyclerView.RecycledViewPool()
+
     override fun onAttach(context: Context) {
         super.onAttach(context)
 
@@ -59,14 +62,15 @@ class CoinListFragment : Fragment() {
     }
 
     private fun setupRecyclerView() {
-        coinsAdapter = CoinsAdapter()
+        coinsAdapter = CoinsAdapter(sharedPool)
 
         val gridLayoutManager = GridLayoutManager(requireContext(), 2)
         gridLayoutManager.spanSizeLookup = object : GridLayoutManager.SpanSizeLookup() {
             override fun getSpanSize(position: Int): Int {
                 return when (coinsAdapter.getItemViewType(position)) {
                     0 -> 2 // Category header spans full width
                     1 -> 1 // Coin item spans half width
+                    2 -> 2
                     else -> 1
                 }
             }
@@ -75,6 +79,7 @@ class CoinListFragment : Fragment() {
         binding.recyclerView.apply {
             layoutManager = gridLayoutManager
             adapter = coinsAdapter
+            setRecycledViewPool(sharedPool)
         }
     }
 

app/src/main/java/ru/otus/cryptosample/coins/feature/adapter/CoinHorizontalAdapter.kt

@@ -0,0 +1,38 @@
+package ru.otus.cryptosample.coins.feature.adapter
+
+import android.view.LayoutInflater
+import android.view.ViewGroup
+import androidx.recyclerview.widget.DiffUtil
+import androidx.recyclerview.widget.ListAdapter
+import androidx.recyclerview.widget.RecyclerView
+import ru.otus.cryptosample.coins.feature.CoinState
+import ru.otus.cryptosample.databinding.ItemCoinBinding
+import ru.otus.cryptosample.databinding.ItemCoinHorizontalListBinding
+
+class CoinHorizontalAdapter :
+    ListAdapter<CoinState, CoinViewHolder>(DiffCallback) {
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): CoinViewHolder {
+        val binding = ItemCoinBinding.inflate(
+            LayoutInflater.from(parent.context),
+            parent,
+            false
+        )
+        return CoinViewHolder(binding)
+    }
+
+    override fun onBindViewHolder(holder: CoinViewHolder, position: Int) {
+        holder.bind(getItem(position))
+    }
+}
+
+object DiffCallback : DiffUtil.ItemCallback<CoinState>() {
+
+    override fun areItemsTheSame(oldItem: CoinState, newItem: CoinState): Boolean {
+        return oldItem.id == newItem.id
+    }
+
+    override fun areContentsTheSame(oldItem: CoinState, newItem: CoinState): Boolean {
+        return oldItem == newItem
+    }
+}

app/src/main/java/ru/otus/cryptosample/coins/feature/adapter/CoinsAdapter.kt

@@ -4,14 +4,20 @@ import android.view.LayoutInflater
 import android.view.ViewGroup
 import androidx.recyclerview.widget.RecyclerView
 import ru.otus.cryptosample.coins.feature.CoinCategoryState
+import ru.otus.cryptosample.coins.feature.CoinState
 import ru.otus.cryptosample.databinding.ItemCategoryHeaderBinding
 import ru.otus.cryptosample.databinding.ItemCoinBinding
+import ru.otus.cryptosample.databinding.ItemCoinHorizontalListBinding
 
-class CoinsAdapter : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
+class CoinsAdapter(
+    private val sharedPool: RecyclerView.RecycledViewPool
+) : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
 
     companion object {
         private const val VIEW_TYPE_CATEGORY = 0
         private const val VIEW_TYPE_COIN = 1
+
+        private const val VIEW_TYPE_COINS_HORIZONTAL = 2
     }
 
     private var items = listOf<CoinsAdapterItem>()
@@ -21,8 +27,14 @@ class CoinsAdapter : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
 
         categories.forEach { category ->
             adapterItems.add(CoinsAdapterItem.CategoryHeader(category.name))
-            category.coins.forEach { coin ->
-                adapterItems.add(CoinsAdapterItem.CoinItem(coin))
+            if (category.coins.size > 10) {
+                adapterItems.add(
+                    CoinsAdapterItem.CoinItemsHorizontalRV(category.coins)
+                )
+            } else {
+                category.coins.forEach { coin ->
+                    adapterItems.add(CoinsAdapterItem.CoinItem(coin))
+                }
             }
         }
 
@@ -36,6 +48,7 @@ class CoinsAdapter : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
         return when (items[position]) {
             is CoinsAdapterItem.CategoryHeader -> VIEW_TYPE_CATEGORY
             is CoinsAdapterItem.CoinItem -> VIEW_TYPE_COIN
+            is CoinsAdapterItem.CoinItemsHorizontalRV -> VIEW_TYPE_COINS_HORIZONTAL
         }
     }
 
@@ -55,10 +68,18 @@ class CoinsAdapter : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
                     false
                 )
             )
+            VIEW_TYPE_COINS_HORIZONTAL -> CoinsHorizontalViewHolder( binding =
+                ItemCoinHorizontalListBinding.inflate(
+                    LayoutInflater.from(parent.context),
+                    parent,
+                    false
+                ),
+                sharedPool = sharedPool
+            )
             else -> throw IllegalArgumentException("Unknown view type: $viewType")
         }
     }
-    
+
     override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
         when (val item = items[position]) {
             is CoinsAdapterItem.CategoryHeader -> {
@@ -67,6 +88,10 @@ class CoinsAdapter : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
             is CoinsAdapterItem.CoinItem -> {
                 (holder as CoinViewHolder).bind(item.coin)
             }
+
+            is CoinsAdapterItem.CoinItemsHorizontalRV -> {
+                (holder as CoinsHorizontalViewHolder).bind(item.coinsList)
+            }
         }
     }
 }

app/src/main/java/ru/otus/cryptosample/coins/feature/adapter/CoinsAdapterItem.kt

@@ -4,5 +4,6 @@ import ru.otus.cryptosample.coins.feature.CoinState
 
 sealed class CoinsAdapterItem {
     data class CategoryHeader(val categoryName: String) : CoinsAdapterItem()
+    data class CoinItemsHorizontalRV(val coinsList: List<CoinState>) : CoinsAdapterItem()
     data class CoinItem(val coin: CoinState) : CoinsAdapterItem()
 }

app/src/main/java/ru/otus/cryptosample/coins/feature/adapter/CoinsHorizontalViewHolder.kt

@@ -0,0 +1,31 @@
+package ru.otus.cryptosample.coins.feature.adapter
+
+import androidx.core.content.ContextCompat
+import androidx.core.view.isVisible
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
+import coil.load
+import ru.otus.cryptosample.R
+import ru.otus.cryptosample.coins.feature.CoinState
+import ru.otus.cryptosample.databinding.ItemCoinBinding
+import ru.otus.cryptosample.databinding.ItemCoinHorizontalListBinding
+
+class CoinsHorizontalViewHolder(
+    private val binding: ItemCoinHorizontalListBinding,
+   private val sharedPool: RecyclerView.RecycledViewPool
+) : RecyclerView.ViewHolder(binding.root) {
+
+    private val adapter = CoinHorizontalAdapter()
+
+    init {
+        binding.recyclerHorizontal.layoutManager =
+            LinearLayoutManager(binding.root.context, LinearLayoutManager.HORIZONTAL, false)
+
+        binding.recyclerHorizontal.adapter = adapter
+        //binding.recyclerHorizontal.setRecycledViewPool(sharedPool) тут краш ClassCastException
+    }
+
+    fun bind(items: List<CoinState>) {
+        adapter.submitList(items)
+    }
+}

app/src/main/res/layout/item_coin_horizontal_list.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.recyclerview.widget.RecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/recycler_horizontal"
+    android:layout_width="wrap_content"
+    android:layout_marginTop="12dp"
+    android:layout_height="wrap_content" />