diff --git a/app/src/main/java/io/legado/app/model/localBook/EpubFile.kt b/app/src/main/java/io/legado/app/model/localBook/EpubFile.kt
index 506331ca8..f71ee340e 100644
--- a/app/src/main/java/io/legado/app/model/localBook/EpubFile.kt
+++ b/app/src/main/java/io/legado/app/model/localBook/EpubFile.kt
@@ -348,7 +348,10 @@ class EpubFile(var book: Book) {
         durIndex = 0
         while (i < contents.size) {
             val content = contents[i]
-            if (!content.mediaType.toString().contains("htm")) continue
+            if (!content.mediaType.toString().contains("htm")) {
+                i++
+                continue
+            }
             /**
              * 检索到第一章href停止
              * completeHref可能有fragment(#id) 必须去除
diff --git a/app/src/main/java/io/legado/app/ui/main/bookshelf/BaseBookshelfFragment.kt b/app/src/main/java/io/legado/app/ui/main/bookshelf/BaseBookshelfFragment.kt
index c4a18d6fa..bdc5d5f4e 100644
--- a/app/src/main/java/io/legado/app/ui/main/bookshelf/BaseBookshelfFragment.kt
+++ b/app/src/main/java/io/legado/app/ui/main/bookshelf/BaseBookshelfFragment.kt
@@ -9,7 +9,6 @@ import androidx.lifecycle.LiveData
 import io.legado.app.R
 import io.legado.app.base.VMBaseFragment
 import io.legado.app.constant.EventBus
-import io.legado.app.constant.PreferKey
 import io.legado.app.data.appDb
 import io.legado.app.data.entities.Book
 import io.legado.app.data.entities.BookGroup
@@ -137,7 +136,7 @@ abstract class BaseBookshelfFragment(layoutId: Int) : VMBaseFragment<BookshelfVi
     @SuppressLint("InflateParams")
     fun configBookshelf() {
         alert(titleResource = R.string.bookshelf_layout) {
-            val bookshelfLayout = getPrefInt(PreferKey.bookshelfLayout)
+            val bookshelfLayout = AppConfig.bookshelfLayout
             val bookshelfSort = AppConfig.bookshelfSort
             val alertBinding =
                 DialogBookshelfConfigBinding.inflate(layoutInflater)
diff --git a/app/src/main/java/io/legado/app/ui/main/bookshelf/style1/BookshelfFragment1.kt b/app/src/main/java/io/legado/app/ui/main/bookshelf/style1/BookshelfFragment1.kt
index e24bebd89..432df984c 100644
--- a/app/src/main/java/io/legado/app/ui/main/bookshelf/style1/BookshelfFragment1.kt
+++ b/app/src/main/java/io/legado/app/ui/main/bookshelf/style1/BookshelfFragment1.kt
@@ -11,7 +11,6 @@ import androidx.fragment.app.FragmentManager
 import androidx.fragment.app.FragmentStatePagerAdapter
 import com.google.android.material.tabs.TabLayout
 import io.legado.app.R
-import io.legado.app.constant.PreferKey
 import io.legado.app.data.appDb
 import io.legado.app.data.entities.Book
 import io.legado.app.data.entities.BookGroup
@@ -126,7 +125,7 @@ class BookshelfFragment1() : BaseBookshelfFragment(R.layout.fragment_bookshelf1)
     override fun onTabUnselected(tab: TabLayout.Tab) = Unit
 
     override fun onTabSelected(tab: TabLayout.Tab) {
-        putPrefInt(PreferKey.saveTabPosition, tab.position)
+        AppConfig.saveTabPosition = tab.position
     }
 
     override fun gotoTop() {
diff --git a/app/src/main/java/io/legado/app/ui/main/bookshelf/style1/books/BooksFragment.kt b/app/src/main/java/io/legado/app/ui/main/bookshelf/style1/books/BooksFragment.kt
index 5a31a761a..f81984c43 100644
--- a/app/src/main/java/io/legado/app/ui/main/bookshelf/style1/books/BooksFragment.kt
+++ b/app/src/main/java/io/legado/app/ui/main/bookshelf/style1/books/BooksFragment.kt
@@ -13,7 +13,6 @@ import io.legado.app.R
 import io.legado.app.base.BaseFragment
 import io.legado.app.constant.AppLog
 import io.legado.app.constant.EventBus
-import io.legado.app.constant.PreferKey
 import io.legado.app.data.appDb
 import io.legado.app.data.entities.Book
 import io.legado.app.data.entities.BookGroup
@@ -52,9 +51,7 @@ class BooksFragment() : BaseFragment(R.layout.fragment_books),
 
     private val binding by viewBinding(FragmentBooksBinding::bind)
     private val activityViewModel by activityViewModels<MainViewModel>()
-    private val bookshelfLayout by lazy {
-        getPrefInt(PreferKey.bookshelfLayout)
-    }
+    private val bookshelfLayout by lazy { AppConfig.bookshelfLayout }
     private val booksAdapter: BaseBooksAdapter<*> by lazy {
         if (bookshelfLayout == 0) {
             BooksAdapterList(requireContext(), this)
diff --git a/app/src/main/java/io/legado/app/ui/main/bookshelf/style2/BookshelfFragment2.kt b/app/src/main/java/io/legado/app/ui/main/bookshelf/style2/BookshelfFragment2.kt
index 38fcf7c3b..a3bdf239b 100644
--- a/app/src/main/java/io/legado/app/ui/main/bookshelf/style2/BookshelfFragment2.kt
+++ b/app/src/main/java/io/legado/app/ui/main/bookshelf/style2/BookshelfFragment2.kt
@@ -12,7 +12,6 @@ import androidx.recyclerview.widget.RecyclerView
 import io.legado.app.R
 import io.legado.app.constant.AppLog
 import io.legado.app.constant.EventBus
-import io.legado.app.constant.PreferKey
 import io.legado.app.data.appDb
 import io.legado.app.data.entities.Book
 import io.legado.app.data.entities.BookGroup
@@ -53,9 +52,7 @@ class BookshelfFragment2() : BaseBookshelfFragment(R.layout.fragment_bookshelf2)
     }
 
     private val binding by viewBinding(FragmentBookshelf2Binding::bind)
-    private val bookshelfLayout by lazy {
-        getPrefInt(PreferKey.bookshelfLayout)
-    }
+    private val bookshelfLayout by lazy { AppConfig.bookshelfLayout }
     private val booksAdapter: BaseBooksAdapter<*> by lazy {
         if (bookshelfLayout == 0) {
             BooksAdapterList(requireContext(), this)
@@ -123,8 +120,10 @@ class BookshelfFragment2() : BaseBookshelfFragment(R.layout.fragment_bookshelf2)
     @SuppressLint("NotifyDataSetChanged")
     private fun initBooksData() {
         if (groupId == -100L) {
-            binding.titleBar.title = getString(R.string.bookshelf)
-            binding.refreshLayout.isEnabled = true
+            if (isAdded) {
+                binding.titleBar.title = getString(R.string.bookshelf)
+                binding.refreshLayout.isEnabled = true
+            }
         } else {
             bookGroups.firstOrNull {
                 groupId == it.groupId
@@ -156,10 +155,12 @@ class BookshelfFragment2() : BaseBookshelfFragment(R.layout.fragment_bookshelf2)
             }.flowOn(Dispatchers.Default).catch {
                 AppLog.put("书架更新出错", it)
             }.conflate().collect { list ->
-                books = list
-                booksAdapter.notifyDataSetChanged()
-                binding.tvEmptyMsg.isGone = getItemCount() > 0
-                delay(100)
+                if (isAdded) {
+                    books = list
+                    booksAdapter.notifyDataSetChanged()
+                    binding.tvEmptyMsg.isGone = getItemCount() > 0
+                    delay(100)
+                }
             }
         }
     }
diff --git a/modules/book/src/main/java/me/ag2s/epublib/domain/MediaTypes.java b/modules/book/src/main/java/me/ag2s/epublib/domain/MediaTypes.java
index ff6233d15..227409590 100644
--- a/modules/book/src/main/java/me/ag2s/epublib/domain/MediaTypes.java
+++ b/modules/book/src/main/java/me/ag2s/epublib/domain/MediaTypes.java
@@ -1,6 +1,6 @@
 package me.ag2s.epublib.domain;
 
-import java.util.HashMap;
+import java.util.LinkedHashMap;
 import java.util.Map;
 
 import me.ag2s.epublib.util.StringUtil;
@@ -60,7 +60,7 @@ public class MediaTypes {
             SMIL, PLS, JAVASCRIPT, MP3, MP4, OGG, UNKNOWN
     };
 
-    public static final Map<String, MediaType> mediaTypesByName = new HashMap<>();
+    public static final Map<String, MediaType> mediaTypesByName = new LinkedHashMap<>();
 
     static {
         for (MediaType mediaType : mediaTypes) {