RecyclerView, recycledViewPool 的实现

sunnyswag · Feb 26, 2023 · d1c822b · d1c822b
1 parent 046541a
commit d1c822b
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diff --git a/app/src/main/java/com/example/recycledviewpooldemo/RecycledViewPoolTest.kt b/app/src/main/java/com/example/recycledviewpooldemo/RecycledViewPoolTest.kt
@@ -0,0 +1,27 @@
+package com.example.recycledviewpooldemo
+
+import android.util.Log
+import androidx.recyclerview.widget.RecyclerView
+
+class RecycledViewPoolTest: RecyclerView.RecycledViewPool() {
+
+    override fun putRecycledView(scrap: RecyclerView.ViewHolder?) {
+        super.putRecycledView(scrap)
+        Log.d(TAG, "putRecycledView: scrap.hashCode(): ${scrap?.hashCode()}")
+    }
+
+    override fun getRecycledView(viewType: Int): RecyclerView.ViewHolder? {
+        return super.getRecycledView(viewType).also {
+            Log.d(TAG, "getRecycledView: it.hashCode(): ${it?.hashCode()}")
+        }
+    }
+
+    override fun clear() {
+        Log.d(TAG, "clear: ")
+        super.clear()
+    }
+
+    companion object {
+        private const val TAG = "RecycledViewPoolTest"
+    }
+}
diff --git a/app/src/main/java/com/example/recycledviewpooldemo/ViewPagerItemFragment.kt b/app/src/main/java/com/example/recycledviewpooldemo/ViewPagerItemFragment.kt
@@ -5,13 +5,18 @@ import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import androidx.fragment.app.Fragment
+import androidx.lifecycle.ViewModelProvider
 import androidx.recyclerview.widget.LinearLayoutManager
 import com.example.recycledviewpooldemo.adapter.RecyclerViewAdapter
 import com.example.recycledviewpooldemo.databinding.ViewpagerItemBinding
+import com.example.recycledviewpooldemo.viewmodel.RecyclerViewItemViewModel
 
 class ViewPagerItemFragment: Fragment() {
 
     lateinit var binding: ViewpagerItemBinding
+    private val viewModel by lazy {
+        ViewModelProvider(requireActivity()).get(RecyclerViewItemViewModel::class.java)
+    }
 
     override fun onCreateView(
         inflater: LayoutInflater,
@@ -25,12 +30,18 @@ class ViewPagerItemFragment: Fragment() {
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
         binding.rvRoot.apply {
+            setRecycledViewPool(viewModel.viewPool)
             adapter = RecyclerViewAdapter()
             layoutManager = LinearLayoutManager(context)
             setItemViewCacheSize(0)
         }
     }
 
+    override fun onDestroy() {
+        super.onDestroy()
+        viewModel.clearViewPool()
+    }
+
     companion object {
         private const val TAG = "ViewPagerItemFragment"
 

diff --git a/app/src/main/java/com/example/recycledviewpooldemo/viewmodel/RecyclerViewItemViewModel.kt b/app/src/main/java/com/example/recycledviewpooldemo/viewmodel/RecyclerViewItemViewModel.kt
@@ -0,0 +1,21 @@
+package com.example.recycledviewpooldemo.viewmodel
+
+import androidx.lifecycle.ViewModel
+import com.example.recycledviewpooldemo.RecycledViewPoolTest
+
+class RecyclerViewItemViewModel: ViewModel() {
+
+    var viewPool = RecycledViewPoolTest().apply {
+        setMaxRecycledViews(0, 10)
+    }
+        private set
+
+    fun clearViewPool() {
+        viewPool.clear()
+    }
+
+    override fun onCleared() {
+        super.onCleared()
+        viewPool.clear()
+    }
+}