优化

app/src/main/java/io/legado/app/base/adapter/RecyclerAdapter.kt

@@ -5,16 +5,15 @@ import android.content.Context
 import android.util.SparseArray
 import android.view.LayoutInflater
 import android.view.ViewGroup
-import androidx.core.os.postDelayed
 import androidx.recyclerview.widget.DiffUtil
 import androidx.recyclerview.widget.GridLayoutManager
 import androidx.recyclerview.widget.RecyclerView
 import androidx.viewbinding.ViewBinding
 import io.legado.app.help.coroutine.Coroutine
 import io.legado.app.utils.buildMainHandler
-import kotlinx.coroutines.ensureActive
+import kotlinx.coroutines.withTimeoutOrNull
 import splitties.views.onLongClick
-import java.util.*
+import java.util.Collections
 
 /**
  * Created by Invincible on 2017/11/24.
@@ -152,9 +151,16 @@ abstract class RecyclerAdapter<ITEM, VB : ViewBinding>(protected val context: Co
             }
             diffJob?.cancel()
             diffJob = Coroutine.async {
-                val diffResult = DiffUtil.calculateDiff(callback)
-                ensureActive()
+                val diffResult = if (skipDiff) withTimeoutOrNull(500L) {
+                    DiffUtil.calculateDiff(callback)
+                } else {
+                    DiffUtil.calculateDiff(callback)
+                }
                 handler.post {
+                    if (diffResult == null) {
+                        setItems(items)
+                        return@post
+                    }
                     if (this@RecyclerAdapter.items.isNotEmpty()) {
                         this@RecyclerAdapter.items.clear()
                     }
@@ -165,12 +171,6 @@ abstract class RecyclerAdapter<ITEM, VB : ViewBinding>(protected val context: Co
                     onCurrentListChanged()
                 }
             }
-            if (skipDiff) handler.postDelayed(500) {
-                if (diffJob?.isCompleted == false) {
-                    diffJob?.cancel()
-                    setItems(items)
-                }
-            }
         }
     }
 

app/src/main/java/io/legado/app/ui/main/bookshelf/style1/books/BaseBooksAdapter.kt

@@ -10,8 +10,8 @@ import io.legado.app.data.entities.Book
 abstract class BaseBooksAdapter<VB : ViewBinding>(context: Context) :
     DiffRecyclerAdapter<Book, VB>(context) {
 
-    override val diffItemCallback: DiffUtil.ItemCallback<