diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index c16b1cfe4..f0b344d72 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -272,6 +272,7 @@
         <!-- WebView界面 -->
         <activity
             android:name=".ui.browser.WebViewActivity"
+            android:configChanges="locale|keyboardHidden|orientation|screenSize|smallestScreenSize|screenLayout"
             android:launchMode="standard" />
         <!-- 书源登录 -->
         <activity
diff --git a/app/src/main/java/io/legado/app/data/dao/BookSourceDao.kt b/app/src/main/java/io/legado/app/data/dao/BookSourceDao.kt
index f0a689843..ccd2b13d8 100644
--- a/app/src/main/java/io/legado/app/data/dao/BookSourceDao.kt
+++ b/app/src/main/java/io/legado/app/data/dao/BookSourceDao.kt
@@ -116,7 +116,7 @@ interface BookSourceDao {
     @Query("select * from book_sources where enabled = 1 and bookSourceType = :type")
     fun getEnabledByType(type: Int): List<BookSource>
 
-    @get:Query("select * from book_sources where trim(bookUrlPattern) <> '' order by enabled desc, customOrder")
+    @get:Query("select * from book_sources where enabled = 1 and trim(bookUrlPattern) <> '' order by enabled desc, customOrder")
     val hasBookUrlPattern: List<BookSource>
 
     @get:Query("select * from book_sources where bookSourceGroup is null or bookSourceGroup = ''")
diff --git a/app/src/main/java/io/legado/app/help/CrashHandler.kt b/app/src/main/java/io/legado/app/help/CrashHandler.kt
index 0de9105a7..b72d9c944 100644
--- a/app/src/main/java/io/legado/app/help/CrashHandler.kt
+++ b/app/src/main/java/io/legado/app/help/CrashHandler.kt
@@ -62,6 +62,9 @@ class CrashHandler(val context: Context) : Thread.UncaughtExceptionHandler {
                 //获取系统信息
                 map["MANUFACTURER"] = Build.MANUFACTURER
                 map["BRAND"] = Build.BRAND
+                map["MODEL"] = Build.MODEL
+                map["SDK_INT"] = Build.VERSION.SDK_INT.toString()
+                map["RELEASE"] = Build.VERSION.RELEASE
                 //获取app版本信息
                 AppConst.appInfo.let {
                     map["versionName"] = it.versionName
diff --git a/app/src/main/java/io/legado/app/model/ReadBook.kt b/app/src/main/java/io/legado/app/model/ReadBook.kt
index 9f9a8222c..a3ef50de9 100644
--- a/app/src/main/java/io/legado/app/model/ReadBook.kt
+++ b/app/src/main/java/io/legado/app/model/ReadBook.kt
@@ -464,6 +464,9 @@ object ReadBook : CoroutineScope by MainScope() {
      * 预下载
      */
     private fun preDownload() {
+        if (AppConfig.preDownloadNum < 2) {
+            return
+        }
         Coroutine.async {
             //预下载
             val maxChapterIndex = durChapterIndex + AppConfig.preDownloadNum
diff --git a/app/src/main/java/io/legado/app/ui/book/cache/CacheViewModel.kt b/app/src/main/java/io/legado/app/ui/book/cache/CacheViewModel.kt
index 980564b18..459921c4a 100644
--- a/app/src/main/java/io/legado/app/ui/book/cache/CacheViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/book/cache/CacheViewModel.kt
@@ -71,7 +71,7 @@ class CacheViewModel(application: Application) : BaseViewModel(application) {
                         }
                     }
                     cacheChapters[book.bookUrl] = chapterCaches
-                    upAdapterLiveData.postValue(book.bookUrl)
+                    upAdapterLiveData.sendValue(book.bookUrl)
                 }
                 ensureActive()
             }
@@ -97,7 +97,7 @@ class CacheViewModel(application: Application) : BaseViewModel(application) {
         if (exportProgress.contains(book.bookUrl)) return
         exportProgress[book.bookUrl] = 0
         exportMsg.remove(book.bookUrl)
-        upAdapterLiveData.postValue(book.bookUrl)
+        upAdapterLiveData.sendValue(book.bookUrl)
         execute {
             mutex.withLock {
                 while (exportNumber > 0) {
@@ -260,7 +260,7 @@ class CacheViewModel(application: Application) : BaseViewModel(application) {
         if (exportProgress.contains(book.bookUrl)) return
         exportProgress[book.bookUrl] = 0
         exportMsg.remove(book.bookUrl)
-        upAdapterLiveData.postValue(book.bookUrl)
+        upAdapterLiveData.sendValue(book.bookUrl)
         execute {
             mutex.withLock {
                 while (exportNumber > 0) {
diff --git a/app/src/main/java/io/legado/app/ui/book/read/page/provider/ChapterProvider.kt b/app/src/main/java/io/legado/app/ui/book/read/page/provider/ChapterProvider.kt
index 4ced93007..bdcb20df0 100644
--- a/app/src/main/java/io/legado/app/ui/book/read/page/provider/ChapterProvider.kt
+++ b/app/src/main/java/io/legado/app/ui/book/read/page/provider/ChapterProvider.kt
@@ -650,6 +650,10 @@ object ChapterProvider {
             "0" -> doublePage = false
             "1" -> doublePage = true
             "2" -> {
+                doublePage = (viewWidth > viewHeight)
+                        && ReadBook.pageAnim() != 3
+            }
+            "3" -> {
                 doublePage = (viewWidth > viewHeight || appCtx.isPad)
                         && ReadBook.pageAnim() != 3
             }
diff --git a/app/src/main/java/io/legado/app/ui/book/search/SearchActivity.kt b/app/src/main/java/io/legado/app/ui/book/search/SearchActivity.kt
index d48ffc8ad..6bb262baa 100644
--- a/app/src/main/java/io/legado/app/ui/book/search/SearchActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/book/search/SearchActivity.kt
@@ -17,6 +17,7 @@ import androidx.recyclerview.widget.RecyclerView
 import com.google.android.flexbox.FlexboxLayoutManager
 import io.legado.app.R
 import io.legado.app.base.VMBaseActivity
+import io.legado.app.constant.AppLog
 import io.legado.app.constant.PreferKey
 import io.legado.app.data.appDb
 import io.legado.app.data.entities.Book
@@ -32,7 +33,9 @@ import io.legado.app.utils.viewbindingdelegate.viewBinding
 import kotlinx.coroutines.Dispatchers.IO
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.catch
 import kotlinx.coroutines.flow.conflate
+import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import splitties.init.appCtx
@@ -288,6 +291,17 @@ class SearchActivity : VMBaseActivity<ActivityBookSearchBinding, SearchViewModel
                 groups = it
             }
         }
+        launch {
+            appDb.bookDao.flowAll().conflate().map { books ->
+                books.map { "${it.name}-${it.author}" }
+            }.catch { e ->
+                AppLog.put("加载书架数据失败", e)
+            }.collect {
+                viewModel.bookshelf.clear()
+                viewModel.bookshelf.addAll(it)
+                viewModel.upAdapterLiveData.postValue("isInBookshelf")
+            }
+        }
     }
 
     /**
diff --git a/app/src/main/java/io/legado/app/ui/book/search/SearchViewModel.kt b/app/src/main/java/io/legado/app/ui/book/search/SearchViewModel.kt
index 95678b484..cb8330bb2 100644
--- a/app/src/main/java/io/legado/app/ui/book/search/SearchViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/book/search/SearchViewModel.kt
@@ -10,14 +10,10 @@ import io.legado.app.data.entities.SearchKeyword
 import io.legado.app.help.config.AppConfig
 import io.legado.app.model.webBook.SearchModel
 import kotlinx.coroutines.Dispatchers.IO
-import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.channels.awaitClose
 import kotlinx.coroutines.flow.callbackFlow
 import kotlinx.coroutines.flow.flowOn
-import kotlinx.coroutines.flow.mapLatest
-import kotlinx.coroutines.launch
 
-@OptIn(ExperimentalCoroutinesApi::class)
 class SearchViewModel(application: Application) : BaseViewModel(application) {
     val bookshelf = hashSetOf<String>()
     val upAdapterLiveData = MutableLiveData<String>()
@@ -61,18 +57,6 @@ class SearchViewModel(application: Application) : BaseViewModel(application) {
         }
     }.flowOn(IO)
 
-    init {
-        viewModelScope.launch {
-            appDb.bookDao.flowAll().mapLatest { books ->
-                books.map { "${it.name}-${it.author}" }
-            }.collect {
-                bookshelf.clear()
-                bookshelf.addAll(it)
-                upAdapterLiveData.postValue("isInBookshelf")
-            }
-        }
-    }
-
     /**
      * 开始搜索
      */
diff --git a/app/src/main/java/io/legado/app/ui/book/source/edit/BookSourceEditActivity.kt b/app/src/main/java/io/legado/app/ui/book/source/edit/BookSourceEditActivity.kt
index d13483a5c..e18d86807 100644
--- a/app/src/main/java/io/legado/app/ui/book/source/edit/BookSourceEditActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/book/source/edit/BookSourceEditActivity.kt
@@ -17,6 +17,7 @@ import io.legado.app.data.appDb
 import io.legado.app.data.entities.BookSource
 import io.legado.app.data.entities.rule.*
 import io.legado.app.databinding.ActivityBookSourceEditBinding
+import io.legado.app.databinding.DialogEditTextBinding
 import io.legado.app.help.config.LocalConfig
 import io.legado.app.lib.dialogs.SelectItem
 import io.legado.app.lib.dialogs.alert
@@ -140,6 +141,7 @@ class BookSourceEditActivity :
                     }
                 }
             }
+            R.id.menu_set_source_variable -> setSourceVariable()
         }
         return super.onCompatOptionsItemSelected(item)
     }
@@ -171,7 +173,12 @@ class BookSourceEditActivity :
 
     override fun finish() {
         val source = getSource()
-        if (!source.equal(viewModel.bookSource ?: BookSource())) {
+        val source2 = viewModel.bookSource ?: BookSource().apply {
+            enabledExplore = true
+            enabledCookieJar = true
+            enabledReview = true
+        }
+        if (!source.equal(source2)) {
             alert(R.string.exit) {
                 setMessage(R.string.exit_no_save)
                 positiveButton(R.string.yes)
@@ -569,4 +576,30 @@ class BookSourceEditActivity :
         showDialogFragment(TextDialog(mdText, TextDialog.Mode.MD))
     }
 
+    private fun setSourceVariable() {
+        launch {
+            val source = viewModel.bookSource
+            if (source == null) {
+                toastOnUi("书源不存在")
+                return@launch
+            }
+            val variable = withContext(IO) { source.getVariable() }
+            alert(R.string.set_source_variable) {
+                setMessage(source.getDisplayVariableComment("源变量可在js中通过source.getVariable()获取"))
+                val alertBinding = DialogEditTextBinding.inflate(layoutInflater).apply {
+                    editView.hint = "source variable"
+                    editView.setText(variable)
+                }
+                customView { alertBinding.root }
+                okButton {
+                    viewModel.bookSource?.setVariable(alertBinding.editView.text?.toString())
+                }
+                cancelButton()
+                neutralButton(R.string.delete) {
+                    viewModel.bookSource?.setVariable(null)
+                }
+            }
+        }
+    }
+
 }
diff --git a/app/src/main/java/io/legado/app/ui/book/source/manage/BookSourceActivity.kt b/app/src/main/java/io/legado/app/ui/book/source/manage/BookSourceActivity.kt
index 0863f4382..4663434f6 100644
--- a/app/src/main/java/io/legado/app/ui/book/source/manage/BookSourceActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/book/source/manage/BookSourceActivity.kt
@@ -1,12 +1,11 @@
 package io.legado.app.ui.book.source.manage
 
 import android.annotation.SuppressLint
-import android.content.Context
-import android.hardware.display.DisplayManager
 import android.os.Bundle
 import android.view.*
 import androidx.activity.viewModels
 import androidx.appcompat.app.AlertDialog
+import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.widget.PopupMenu
 import androidx.appcompat.widget.SearchView
 import androidx.core.os.bundleOf
@@ -70,9 +69,7 @@ class BookSourceActivity : VMBaseActivity<ActivityBookSourceBinding, BookSourceV
     private var sort = Sort.Default
     private var sortAscending = true
     private var snackBar: Snackbar? = null
-    private val displayManager by lazy {
-        getSystemService(Context.DISPLAY_SERVICE) as DisplayManager
-    }
+    private var isPaused = false
     private val qrResult = registerForActivityResult(QrCodeResult()) {
         it ?: return@registerForActivityResult
         showDialogFragment(ImportBookSourceDialog(it))
@@ -516,7 +513,7 @@ class BookSourceActivity : VMBaseActivity<ActivityBookSourceBinding, BookSourceV
                     delay(300L)
                 }
             }.collect {
-                if (isScreenOn()) {
+                if (SystemUtils.isScreenOn() && !isPaused) {
                     if (lastItem == 0) {
                         adapter.notifyItemRangeChanged(
                             0,
@@ -552,11 +549,14 @@ class BookSourceActivity : VMBaseActivity<ActivityBookSourceBinding, BookSourceV
         }
     }
 
-    private fun isScreenOn(): Boolean {
-        return displayManager.displays.any {
-            it ?: return@any false
-            it.state != Display.STATE_OFF
-        }
+    override fun onPause() {
+        super.onPause()
+        isPaused = true
+    }
+
+    override fun onResume() {
+        super.onResume()
+        isPaused = false
     }
 
     override fun upCountView() {
diff --git a/app/src/main/java/io/legado/app/ui/book/toc/rule/TxtTocRuleActivity.kt b/app/src/main/java/io/legado/app/ui/book/toc/rule/TxtTocRuleActivity.kt
index acd54556f..1e973becc 100644
--- a/app/src/main/java/io/legado/app/ui/book/toc/rule/TxtTocRuleActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/book/toc/rule/TxtTocRuleActivity.kt
@@ -75,6 +75,11 @@ class TxtTocRuleActivity : VMBaseActivity<ActivityTxtTocRuleBinding, TxtTocRuleV
         return super.onCompatCreateOptionsMenu(menu)
     }
 
+    override fun onPrepareOptionsMenu(menu: Menu?): Boolean {
+        menu?.findItem(R.id.menu_split_long_chapter)?.isVisible = false
+        return super.onPrepareOptionsMenu(menu)
+    }
+
     override fun onCompatOptionsItemSelected(item: MenuItem): Boolean {
         when (item.itemId) {
             R.id.menu_add -> showDialogFragment(TxtTocRuleEditDialog())
diff --git a/app/src/main/java/io/legado/app/ui/book/toc/rule/TxtTocRuleAdapter.kt b/app/src/main/java/io/legado/app/ui/book/toc/rule/TxtTocRuleAdapter.kt
index 71da2bfdf..01643e40a 100644
--- a/app/src/main/java/io/legado/app/ui/book/toc/rule/TxtTocRuleAdapter.kt
+++ b/app/src/main/java/io/legado/app/ui/book/toc/rule/TxtTocRuleAdapter.kt
@@ -73,6 +73,7 @@ class TxtTocRuleAdapter(context: Context, private val callBack: CallBack) :
             getItem(holder.layoutPosition)?.let {
                 if (buttonView.isPressed) {
                     it.enable = isChecked
+                    callBack.update(it)
                 }
             }
         }
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 71952b9f7..3d4d87a0a 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
@@ -152,6 +152,18 @@ class BooksFragment() : BaseFragment(R.layout.fragment_books),
         }
     }
 
+    override fun onPause() {
+        super.onPause()
+        upLastUpdateTimeJob?.cancel()
+        booksFlowJob?.cancel()
+    }
+
+    override fun onResume() {
+        super.onResume()
+        startLastUpdateTimeJob()
+        upRecyclerData()
+    }
+
     private fun startLastUpdateTimeJob() {
         upLastUpdateTimeJob?.cancel()
         if (!AppConfig.showLastUpdateTime) {
@@ -159,7 +171,9 @@ class BooksFragment() : BaseFragment(R.layout.fragment_books),
         }
         upLastUpdateTimeJob = launch {
             while (isActive) {
-                booksAdapter.upLastUpdateTime()
+                if (SystemUtils.isScreenOn()) {
+                    booksAdapter.upLastUpdateTime()
+                }
                 delay(30 * 1000)
             }
         }
diff --git a/app/src/main/java/io/legado/app/ui/rss/read/ReadRssActivity.kt b/app/src/main/java/io/legado/app/ui/rss/read/ReadRssActivity.kt
index 4e72e0f93..00038de4c 100644
--- a/app/src/main/java/io/legado/app/ui/rss/read/ReadRssActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/rss/read/ReadRssActivity.kt
@@ -215,6 +215,7 @@ class ReadRssActivity : VMBaseActivity<ActivityRssReadBinding, ReadRssViewModel>
     }
 
     override fun upStarMenu() {
+        starMenuItem?.isVisible = viewModel.rssArticle != null
         if (viewModel.rssStar != null) {
             starMenuItem?.setIcon(R.drawable.ic_star)
             starMenuItem?.setTitle(R.string.in_favorites)
diff --git a/app/src/main/java/io/legado/app/utils/MutableLiveDataExtensions.kt b/app/src/main/java/io/legado/app/utils/MutableLiveDataExtensions.kt
new file mode 100644
index 000000000..c4fc6be6e
--- /dev/null
+++ b/app/src/main/java/io/legado/app/utils/MutableLiveDataExtensions.kt
@@ -0,0 +1,13 @@
+package io.legado.app.utils
+
+import android.os.Handler
+import android.os.Looper
+import androidx.lifecycle.MutableLiveData
+
+private val mainHandler by lazy { Handler(Looper.getMainLooper()) }
+
+fun <T> MutableLiveData<T>.sendValue(value: T) {
+    mainHandler.post {
+        this@sendValue.value = value
+    }
+}
diff --git a/app/src/main/java/io/legado/app/utils/SystemUtils.kt b/app/src/main/java/io/legado/app/utils/SystemUtils.kt
index 8d077201f..4ac96eaae 100644
--- a/app/src/main/java/io/legado/app/utils/SystemUtils.kt
+++ b/app/src/main/java/io/legado/app/utils/SystemUtils.kt
@@ -5,6 +5,8 @@ import android.app.Activity
 import android.content.Intent
 import android.net.Uri
 import android.provider.Settings
+import android.view.Display
+import splitties.systemservices.displayManager
 import splitties.systemservices.powerManager
 
 
@@ -28,4 +30,9 @@ object SystemUtils {
         }
     }
 
+    fun isScreenOn(): Boolean {
+        return displayManager.displays.filterNotNull().any {
+            it.state != Display.STATE_OFF
+        }
+    }
 }
diff --git a/app/src/main/res/layout/item_search.xml b/app/src/main/res/layout/item_search.xml
index 862f242ce..fcb67d9f9 100644
--- a/app/src/main/res/layout/item_search.xml
+++ b/app/src/main/res/layout/item_search.xml
@@ -27,8 +27,8 @@
         android:scaleType="centerCrop"
         android:src="@color/md_green_600"
         android:visibility="invisible"
-        app:layout_constraintRight_toRightOf="@id/iv_cover"
-        app:layout_constraintTop_toTopOf="@id/iv_cover" />
+        app:layout_constraintLeft_toRightOf="@id/iv_cover"
+        app:layout_constraintTop_toTopOf="@id/tv_name" />
 
     <io.legado.app.ui.widget.text.BadgeView
         android:id="@+id/bv_originCount"
@@ -48,16 +48,17 @@
         android:textColor="@color/primaryText"
         android:textSize="16sp"
         app:layout_constraintEnd_toStartOf="@id/bv_originCount"
-        app:layout_constraintStart_toEndOf="@+id/iv_cover"
+        app:layout_constraintStart_toEndOf="@+id/iv_in_bookshelf"
         app:layout_constraintTop_toTopOf="parent" />
 
     <LinearLayout
         android:layout_width="0dp"
         android:layout_height="0dp"
+        android:layout_marginStart="8dp"
         android:orientation="vertical"
         android:layout_marginTop="3dp"
         app:layout_constraintBottom_toBottomOf="@id/iv_cover"
-        app:layout_constraintLeft_toLeftOf="@+id/tv_name"
+        app:layout_constraintLeft_toRightOf="@+id/iv_cover"
         app:layout_constraintRight_toRightOf="@id/tv_name"
         app:layout_constraintTop_toBottomOf="@+id/tv_name">
 
diff --git a/app/src/main/res/menu/source_edit.xml b/app/src/main/res/menu/source_edit.xml
index 140c935b2..28690ffb5 100644
--- a/app/src/main/res/menu/source_edit.xml
+++ b/app/src/main/res/menu/source_edit.xml
@@ -42,6 +42,11 @@
         android:title="@string/paste_source"
         app:showAsAction="never" />
 
+    <item
+        android:id="@+id/menu_set_source_variable"
+        android:title="@string/set_source_variable"
+        app:showAsAction="never" />
+
     <item
         android:id="@+id/menu_qr_code_camera"
         android:title="@string/import_by_qr_code"
diff --git a/app/src/main/res/values-zh/arrays.xml b/app/src/main/res/values-zh/arrays.xml
index f88cb19ae..b29ea4d04 100644
--- a/app/src/main/res/values-zh/arrays.xml
+++ b/app/src/main/res/values-zh/arrays.xml
@@ -28,7 +28,8 @@
     <string-array name="double_page_title">
         <item>全局单页</item>
         <item>全局双页</item>
-        <item>横屏双页/竖屏单页</item>
+        <item>横屏双页</item>
+        <item>平板/横屏双页</item>
     </string-array>
 
     <string-array name="NavBarColors">
diff --git a/app/src/main/res/values/array_values.xml b/app/src/main/res/values/array_values.xml
index e0b0a88dc..1b7e135ff 100644
--- a/app/src/main/res/values/array_values.xml
+++ b/app/src/main/res/values/array_values.xml
@@ -38,6 +38,7 @@
         <item>0</item>
         <item>1</item>
         <item>2</item>
+        <item>3</item>
     </string-array>
 
     <string-array name="progress_bar_behavior_value">
diff --git a/app/src/main/res/values/arrays.xml b/app/src/main/res/values/arrays.xml
index 6c5608372..72146bce7 100644
--- a/app/src/main/res/values/arrays.xml
+++ b/app/src/main/res/values/arrays.xml
@@ -65,7 +65,8 @@
 	<string-array name="double_page_title">
 		<item>全局单页</item>
 		<item>全局双页</item>
-		<item>横屏双页 竖屏单页</item>
+		<item>横屏双页</item>
+		<item>平板/横屏双页</item>
 	</string-array>
 
 	<string-array name="progress_bar_behavior_title">