diff --git a/app/src/main/java/io/legado/app/base/adapter/SimpleRecyclerAdapter.kt b/app/src/main/java/io/legado/app/base/adapter/DiffRecyclerAdapter.kt
similarity index 98%
rename from app/src/main/java/io/legado/app/base/adapter/SimpleRecyclerAdapter.kt
rename to app/src/main/java/io/legado/app/base/adapter/DiffRecyclerAdapter.kt
index d684449a4..ea96c3b61 100644
--- a/app/src/main/java/io/legado/app/base/adapter/SimpleRecyclerAdapter.kt
+++ b/app/src/main/java/io/legado/app/base/adapter/DiffRecyclerAdapter.kt
@@ -15,7 +15,7 @@ import kotlin.collections.ArrayList
  * Created by Invincible on 2017/12/15.
  */
 @Suppress("unused")
-abstract class SimpleRecyclerAdapter<ITEM, VB : ViewBinding>(protected val context: Context) :
+abstract class DiffRecyclerAdapter<ITEM, VB : ViewBinding>(protected val context: Context) :
     RecyclerView.Adapter<ItemViewHolder>() {
 
     val inflater: LayoutInflater = LayoutInflater.from(context)
diff --git a/app/src/main/java/io/legado/app/ui/book/changecover/CoverAdapter.kt b/app/src/main/java/io/legado/app/ui/book/changecover/CoverAdapter.kt
index 6132ca3dd..6801e0ebc 100644
--- a/app/src/main/java/io/legado/app/ui/book/changecover/CoverAdapter.kt
+++ b/app/src/main/java/io/legado/app/ui/book/changecover/CoverAdapter.kt
@@ -3,14 +3,14 @@ package io.legado.app.ui.book.changecover
 import android.content.Context
 import android.view.ViewGroup
 import androidx.recyclerview.widget.DiffUtil
+import io.legado.app.base.adapter.DiffRecyclerAdapter
 import io.legado.app.base.adapter.ItemViewHolder
-import io.legado.app.base.adapter.SimpleRecyclerAdapter
 import io.legado.app.data.entities.SearchBook
 import io.legado.app.databinding.ItemCoverBinding
 import org.jetbrains.anko.sdk27.listeners.onClick
 
 class CoverAdapter(context: Context, val callBack: CallBack) :
-    SimpleRecyclerAdapter<SearchBook, ItemCoverBinding>(context) {
+    DiffRecyclerAdapter<SearchBook, ItemCoverBinding>(context) {
 
     override val diffItemCallback: DiffUtil.ItemCallback<SearchBook>
         get() = object : DiffUtil.ItemCallback<SearchBook>() {
diff --git a/app/src/main/java/io/legado/app/ui/book/changesource/ChangeSourceAdapter.kt b/app/src/main/java/io/legado/app/ui/book/changesource/ChangeSourceAdapter.kt
index 48a9dfcc1..2db9cb239 100644
--- a/app/src/main/java/io/legado/app/ui/book/changesource/ChangeSourceAdapter.kt
+++ b/app/src/main/java/io/legado/app/ui/book/changesource/ChangeSourceAdapter.kt
@@ -7,8 +7,8 @@ import android.view.ViewGroup
 import androidx.appcompat.widget.PopupMenu
 import androidx.recyclerview.widget.DiffUtil
 import io.legado.app.R
+import io.legado.app.base.adapter.DiffRecyclerAdapter
 import io.legado.app.base.adapter.ItemViewHolder
-import io.legado.app.base.adapter.SimpleRecyclerAdapter
 import io.legado.app.data.entities.SearchBook
 import io.legado.app.databinding.ItemChangeSourceBinding
 import io.legado.app.utils.invisible
@@ -18,7 +18,7 @@ import org.jetbrains.anko.sdk27.listeners.onLongClick
 
 
 class ChangeSourceAdapter(context: Context, val callBack: CallBack) :
-    SimpleRecyclerAdapter<SearchBook, ItemChangeSourceBinding>(context) {
+    DiffRecyclerAdapter<SearchBook, ItemChangeSourceBinding>(context) {
 
     override val diffItemCallback: DiffUtil.ItemCallback<SearchBook>
         get() = object : DiffUtil.ItemCallback<SearchBook>() {
diff --git a/app/src/main/java/io/legado/app/ui/book/group/GroupManageDialog.kt b/app/src/main/java/io/legado/app/ui/book/group/GroupManageDialog.kt
index d0d237f7d..0e93876d9 100644
--- a/app/src/main/java/io/legado/app/ui/book/group/GroupManageDialog.kt
+++ b/app/src/main/java/io/legado/app/ui/book/group/GroupManageDialog.kt
@@ -16,8 +16,8 @@ import androidx.recyclerview.widget.RecyclerView
 import io.legado.app.App
 import io.legado.app.R
 import io.legado.app.base.BaseDialogFragment
+import io.legado.app.base.adapter.DiffRecyclerAdapter
 import io.legado.app.base.adapter.ItemViewHolder
-import io.legado.app.base.adapter.SimpleRecyclerAdapter
 import io.legado.app.data.entities.BookGroup
 import io.legado.app.databinding.DialogEditTextBinding
 import io.legado.app.databinding.DialogRecyclerViewBinding
@@ -137,7 +137,7 @@ class GroupManageDialog : BaseDialogFragment(), Toolbar.OnMenuItemClickListener
     }
 
     private inner class GroupAdapter(context: Context) :
-        SimpleRecyclerAdapter<BookGroup, ItemGroupManageBinding>(context),
+        DiffRecyclerAdapter<BookGroup, ItemGroupManageBinding>(context),
         ItemTouchCallback.Callback {
 
         private var isMoved = false
diff --git a/app/src/main/java/io/legado/app/ui/book/search/SearchAdapter.kt b/app/src/main/java/io/legado/app/ui/book/search/SearchAdapter.kt
index c3d77b2fe..732a5de4e 100644
--- a/app/src/main/java/io/legado/app/ui/book/search/SearchAdapter.kt
+++ b/app/src/main/java/io/legado/app/ui/book/search/SearchAdapter.kt
@@ -5,8 +5,8 @@ import android.os.Bundle
 import android.view.ViewGroup
 import androidx.recyclerview.widget.DiffUtil
 import io.legado.app.R
+import io.legado.app.base.adapter.DiffRecyclerAdapter
 import io.legado.app.base.adapter.ItemViewHolder
-import io.legado.app.base.adapter.SimpleRecyclerAdapter
 import io.legado.app.data.entities.SearchBook
 import io.legado.app.databinding.ItemSearchBinding
 import io.legado.app.utils.gone
@@ -14,7 +14,7 @@ import io.legado.app.utils.visible
 import org.jetbrains.anko.sdk27.listeners.onClick
 
 class SearchAdapter(context: Context, val callBack: CallBack) :
-    SimpleRecyclerAdapter<SearchBook, ItemSearchBinding>(context) {
+    DiffRecyclerAdapter<SearchBook, ItemSearchBinding>(context) {
 
     override val diffItemCallback: DiffUtil.ItemCallback<SearchBook>
         get() = object : DiffUtil.ItemCallback<SearchBook>() {
diff --git a/app/src/main/java/io/legado/app/ui/book/source/manage/BookSourceAdapter.kt b/app/src/main/java/io/legado/app/ui/book/source/manage/BookSourceAdapter.kt
index 949a86516..41e5a1819 100644
--- a/app/src/main/java/io/legado/app/ui/book/source/manage/BookSourceAdapter.kt
+++ b/app/src/main/java/io/legado/app/ui/book/source/manage/BookSourceAdapter.kt
@@ -11,8 +11,8 @@ import androidx.core.os.bundleOf
 import androidx.recyclerview.widget.DiffUtil
 import androidx.recyclerview.widget.RecyclerView
 import io.legado.app.R
+import io.legado.app.base.adapter.DiffRecyclerAdapter
 import io.legado.app.base.adapter.ItemViewHolder
-import io.legado.app.base.adapter.SimpleRecyclerAdapter
 import io.legado.app.data.entities.BookSource
 import io.legado.app.databinding.ItemBookSourceBinding
 import io.legado.app.lib.theme.backgroundColor
@@ -23,11 +23,53 @@ import io.legado.app.utils.visible
 import org.jetbrains.anko.sdk27.listeners.onClick
 
 class BookSourceAdapter(context: Context, val callBack: CallBack) :
-    SimpleRecyclerAdapter<BookSource, ItemBookSourceBinding>(context),
+    DiffRecyclerAdapter<BookSource, ItemBookSourceBinding>(context),
     Callback {
 
     override val diffItemCallback: DiffUtil.ItemCallback<BookSource>
-        get() = DiffCallBack()
+        get() = object : DiffUtil.ItemCallback<BookSource>() {
+
+            override fun areItemsTheSame(oldItem: BookSource, newItem: BookSource): Boolean {
+                return oldItem.bookSourceUrl == newItem.bookSourceUrl
+            }
+
+            override fun areContentsTheSame(oldItem: BookSource, newItem: BookSource): Boolean {
+                if (oldItem.bookSourceName != newItem.bookSourceName)
+                    return false
+                if (oldItem.bookSourceGroup != newItem.bookSourceGroup)
+                    return false
+                if (oldItem.enabled != newItem.enabled)
+                    return false
+                if (oldItem.enabledExplore != newItem.enabledExplore
+                    || oldItem.exploreUrl != newItem.exploreUrl
+                ) {
+                    return false
+                }
+                return true
+            }
+
+            override fun getChangePayload(oldItem: BookSource, newItem: BookSource): Any? {
+                val payload = Bundle()
+                if (oldItem.bookSourceName != newItem.bookSourceName) {
+                    payload.putString("name", newItem.bookSourceName)
+                }
+                if (oldItem.bookSourceGroup != newItem.bookSourceGroup) {
+                    payload.putString("group", newItem.bookSourceGroup)
+                }
+                if (oldItem.enabled != newItem.enabled) {
+                    payload.putBoolean("enabled", newItem.enabled)
+                }
+                if (oldItem.enabledExplore != newItem.enabledExplore
+                    || oldItem.exploreUrl != newItem.exploreUrl
+                ) {
+                    payload.putBoolean("showExplore", true)
+                }
+                if (payload.isEmpty) {
+                    return null
+                }
+                return payload
+            }
+        }
 
     private val selected = linkedSetOf<BookSource>()
 
diff --git a/app/src/main/java/io/legado/app/ui/book/source/manage/DiffCallBack.kt b/app/src/main/java/io/legado/app/ui/book/source/manage/DiffCallBack.kt
deleted file mode 100644
index 787e3a129..000000000
--- a/app/src/main/java/io/legado/app/ui/book/source/manage/DiffCallBack.kt
+++ /dev/null
@@ -1,49 +0,0 @@
-package io.legado.app.ui.book.source.manage
-
-import android.os.Bundle
-import androidx.recyclerview.widget.DiffUtil
-import io.legado.app.data.entities.BookSource
-
-class DiffCallBack : DiffUtil.ItemCallback<BookSource>() {
-
-    override fun areItemsTheSame(oldItem: BookSource, newItem: BookSource): Boolean {
-        return oldItem.bookSourceUrl == newItem.bookSourceUrl
-    }
-
-    override fun areContentsTheSame(oldItem: BookSource, newItem: BookSource): Boolean {
-        if (oldItem.bookSourceName != newItem.bookSourceName)
-            return false
-        if (oldItem.bookSourceGroup != newItem.bookSourceGroup)
-            return false
-        if (oldItem.enabled != newItem.enabled)
-            return false
-        if (oldItem.enabledExplore != newItem.enabledExplore
-            || oldItem.exploreUrl != newItem.exploreUrl
-        ) {
-            return false
-        }
-        return true
-    }
-
-    override fun getChangePayload(oldItem: BookSource, newItem: BookSource): Any? {
-        val payload = Bundle()
-        if (oldItem.bookSourceName != newItem.bookSourceName) {
-            payload.putString("name", newItem.bookSourceName)
-        }
-        if (oldItem.bookSourceGroup != newItem.bookSourceGroup) {
-            payload.putString("group", newItem.bookSourceGroup)
-        }
-        if (oldItem.enabled != newItem.enabled) {
-            payload.putBoolean("enabled", newItem.enabled)
-        }
-        if (oldItem.enabledExplore != newItem.enabledExplore
-            || oldItem.exploreUrl != newItem.exploreUrl
-        ) {
-            payload.putBoolean("showExplore", true)
-        }
-        if (payload.isEmpty) {
-            return null
-        }
-        return payload
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/ui/main/bookshelf/books/BaseBooksAdapter.kt b/app/src/main/java/io/legado/app/ui/main/bookshelf/books/BaseBooksAdapter.kt
index 034003538..538887c1c 100644
--- a/app/src/main/java/io/legado/app/ui/main/bookshelf/books/BaseBooksAdapter.kt
+++ b/app/src/main/java/io/legado/app/ui/main/bookshelf/books/BaseBooksAdapter.kt
@@ -4,14 +4,63 @@ import android.content.Context
 import androidx.core.os.bundleOf
 import androidx.recyclerview.widget.DiffUtil
 import androidx.viewbinding.ViewBinding
-import io.legado.app.base.adapter.SimpleRecyclerAdapter
+import io.legado.app.base.adapter.DiffRecyclerAdapter
 import io.legado.app.data.entities.Book
 
 abstract class BaseBooksAdapter<VB : ViewBinding>(context: Context) :
-    SimpleRecyclerAdapter<Book, VB>(context) {
+    DiffRecyclerAdapter<Book, VB>(context) {
 
     override val diffItemCallback: DiffUtil.ItemCallback<Book>
-        get() = BooksDiffCallBack()
+        get() = object : DiffUtil.ItemCallback<Book>() {
+
+            override fun areItemsTheSame(oldItem: Book, newItem: Book): Boolean {
+                return oldItem.name == newItem.name
+                        && oldItem.author == newItem.author
+            }
+
+            override fun areContentsTheSame(oldItem: Book, newItem: Book): Boolean {
+                return when {
+                    oldItem.durChapterTime != newItem.durChapterTime -> false
+                    oldItem.name != newItem.name -> false
+                    oldItem.author != newItem.author -> false
+                    oldItem.durChapterTitle != newItem.durChapterTitle -> false
+                    oldItem.latestChapterTitle != newItem.latestChapterTitle -> false
+                    oldItem.lastCheckCount != newItem.lastCheckCount -> false
+                    oldItem.getDisplayCover() != newItem.getDisplayCover() -> false
+                    oldItem.getUnreadChapterNum() != newItem.getUnreadChapterNum() -> false
+                    else -> true
+                }
+            }
+
+            override fun getChangePayload(oldItem: Book, newItem: Book): Any? {
+                val bundle = bundleOf()
+                if (oldItem.name != newItem.name) {
+                    bundle.putString("name", newItem.name)
+                }
+                if (oldItem.author != newItem.author) {
+                    bundle.putString("author", newItem.author)
+                }
+                if (oldItem.durChapterTitle != newItem.durChapterTitle) {
+                    bundle.putString("dur", newItem.durChapterTitle)
+                }
+                if (oldItem.latestChapterTitle != newItem.latestChapterTitle) {
+                    bundle.putString("last", newItem.latestChapterTitle)
+                }
+                if (oldItem.getDisplayCover() != newItem.getDisplayCover()) {
+                    bundle.putString("cover", newItem.getDisplayCover())
+                }
+                if (oldItem.lastCheckCount != newItem.lastCheckCount
+                    || oldItem.durChapterTime != newItem.durChapterTime
+                    || oldItem.getUnreadChapterNum() != newItem.getUnreadChapterNum()
+                    || oldItem.lastCheckCount != newItem.lastCheckCount
+                ) {
+                    bundle.putBoolean("refresh", true)
+                }
+                if (bundle.isEmpty) return null
+                return bundle
+            }
+
+        }
 
     fun notification(bookUrl: String) {
         for (i in 0 until itemCount) {
diff --git a/app/src/main/java/io/legado/app/ui/main/bookshelf/books/BooksDiffCallBack.kt b/app/src/main/java/io/legado/app/ui/main/bookshelf/books/BooksDiffCallBack.kt
deleted file mode 100644
index 5c5fcf62f..000000000
--- a/app/src/main/java/io/legado/app/ui/main/bookshelf/books/BooksDiffCallBack.kt
+++ /dev/null
@@ -1,56 +0,0 @@
-package io.legado.app.ui.main.bookshelf.books
-
-import androidx.core.os.bundleOf
-import androidx.recyclerview.widget.DiffUtil
-import io.legado.app.data.entities.Book
-
-class BooksDiffCallBack() : DiffUtil.ItemCallback<Book>() {
-
-    override fun areItemsTheSame(oldItem: Book, newItem: Book): Boolean {
-        return oldItem.name == newItem.name
-                && oldItem.author == newItem.author
-    }
-
-    override fun areContentsTheSame(oldItem: Book, newItem: Book): Boolean {
-        return when {
-            oldItem.durChapterTime != newItem.durChapterTime -> false
-            oldItem.name != newItem.name -> false
-            oldItem.author != newItem.author -> false
-            oldItem.durChapterTitle != newItem.durChapterTitle -> false
-            oldItem.latestChapterTitle != newItem.latestChapterTitle -> false
-            oldItem.lastCheckCount != newItem.lastCheckCount -> false
-            oldItem.getDisplayCover() != newItem.getDisplayCover() -> false
-            oldItem.getUnreadChapterNum() != newItem.getUnreadChapterNum() -> false
-            else -> true
-        }
-    }
-
-    override fun getChangePayload(oldItem: Book, newItem: Book): Any? {
-        val bundle = bundleOf()
-        if (oldItem.name != newItem.name) {
-            bundle.putString("name", newItem.name)
-        }
-        if (oldItem.author != newItem.author) {
-            bundle.putString("author", newItem.author)
-        }
-        if (oldItem.durChapterTitle != newItem.durChapterTitle) {
-            bundle.putString("dur", newItem.durChapterTitle)
-        }
-        if (oldItem.latestChapterTitle != newItem.latestChapterTitle) {
-            bundle.putString("last", newItem.latestChapterTitle)
-        }
-        if (oldItem.getDisplayCover() != newItem.getDisplayCover()) {
-            bundle.putString("cover", newItem.getDisplayCover())
-        }
-        if (oldItem.lastCheckCount != newItem.lastCheckCount
-            || oldItem.durChapterTime != newItem.durChapterTime
-            || oldItem.getUnreadChapterNum() != newItem.getUnreadChapterNum()
-            || oldItem.lastCheckCount != newItem.lastCheckCount
-        ) {
-            bundle.putBoolean("refresh", true)
-        }
-        if (bundle.isEmpty) return null
-        return bundle
-    }
-
-}
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/ui/rss/source/manage/DiffCallBack.kt b/app/src/main/java/io/legado/app/ui/rss/source/manage/DiffCallBack.kt
deleted file mode 100644
index 2945a9b95..000000000
--- a/app/src/main/java/io/legado/app/ui/rss/source/manage/DiffCallBack.kt
+++ /dev/null
@@ -1,35 +0,0 @@
-package io.legado.app.ui.rss.source.manage
-
-import android.os.Bundle
-import androidx.recyclerview.widget.DiffUtil
-import io.legado.app.data.entities.RssSource
-
-class DiffCallBack : DiffUtil.ItemCallback<RssSource>() {
-
-    override fun areItemsTheSame(oldItem: RssSource, newItem: RssSource): Boolean {
-        return oldItem.sourceUrl == newItem.sourceUrl
-    }
-
-    override fun areContentsTheSame(oldItem: RssSource, newItem: RssSource): Boolean {
-        return oldItem.sourceName == newItem.sourceName
-                && oldItem.sourceGroup == newItem.sourceGroup
-                && oldItem.enabled == newItem.enabled
-    }
-
-    override fun getChangePayload(oldItem: RssSource, newItem: RssSource): Any? {
-        val payload = Bundle()
-        if (oldItem.sourceName != newItem.sourceName) {
-            payload.putString("name", newItem.sourceName)
-        }
-        if (oldItem.sourceGroup != newItem.sourceGroup) {
-            payload.putString("group", newItem.sourceGroup)
-        }
-        if (oldItem.enabled != newItem.enabled) {
-            payload.putBoolean("enabled", newItem.enabled)
-        }
-        if (payload.isEmpty) {
-            return null
-        }
-        return payload
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/ui/rss/source/manage/RssSourceAdapter.kt b/app/src/main/java/io/legado/app/ui/rss/source/manage/RssSourceAdapter.kt
index 952e814f4..284149d37 100644
--- a/app/src/main/java/io/legado/app/ui/rss/source/manage/RssSourceAdapter.kt
+++ b/app/src/main/java/io/legado/app/ui/rss/source/manage/RssSourceAdapter.kt
@@ -9,8 +9,8 @@ import androidx.core.os.bundleOf
 import androidx.recyclerview.widget.DiffUtil
 import androidx.recyclerview.widget.RecyclerView
 import io.legado.app.R
+import io.legado.app.base.adapter.DiffRecyclerAdapter
 import io.legado.app.base.adapter.ItemViewHolder
-import io.legado.app.base.adapter.SimpleRecyclerAdapter
 import io.legado.app.data.entities.RssSource
 import io.legado.app.databinding.ItemRssSourceBinding
 import io.legado.app.lib.theme.backgroundColor
@@ -19,11 +19,39 @@ import io.legado.app.ui.widget.recycler.ItemTouchCallback
 import org.jetbrains.anko.sdk27.listeners.onClick
 
 class RssSourceAdapter(context: Context, val callBack: CallBack) :
-    SimpleRecyclerAdapter<RssSource, ItemRssSourceBinding>(context),
+    DiffRecyclerAdapter<RssSource, ItemRssSourceBinding>(context),
     ItemTouchCallback.Callback {
 
     override val diffItemCallback: DiffUtil.ItemCallback<RssSource>
-        get() = DiffCallBack()
+        get() = object : DiffUtil.ItemCallback<RssSource>() {
+
+            override fun areItemsTheSame(oldItem: RssSource, newItem: RssSource): Boolean {
+                return oldItem.sourceUrl == newItem.sourceUrl
+            }
+
+            override fun areContentsTheSame(oldItem: RssSource, newItem: RssSource): Boolean {
+                return oldItem.sourceName == newItem.sourceName
+                        && oldItem.sourceGroup == newItem.sourceGroup
+                        && oldItem.enabled == newItem.enabled
+            }
+
+            override fun getChangePayload(oldItem: RssSource, newItem: RssSource): Any? {
+                val payload = Bundle()
+                if (oldItem.sourceName != newItem.sourceName) {
+                    payload.putString("name", newItem.sourceName)
+                }
+                if (oldItem.sourceGroup != newItem.sourceGroup) {
+                    payload.putString("group", newItem.sourceGroup)
+                }
+                if (oldItem.enabled != newItem.enabled) {
+                    payload.putBoolean("enabled", newItem.enabled)
+                }
+                if (payload.isEmpty) {
+                    return null
+                }
+                return payload
+            }
+        }
 
     private val selected = linkedSetOf<RssSource>()