diff --git a/app/src/main/java/io/legado/app/App.kt b/app/src/main/java/io/legado/app/App.kt
index 8565ceb9e..fed02381c 100644
--- a/app/src/main/java/io/legado/app/App.kt
+++ b/app/src/main/java/io/legado/app/App.kt
@@ -15,9 +15,9 @@ import io.legado.app.constant.AppConst.channelIdReadAloud
 import io.legado.app.constant.AppConst.channelIdWeb
 import io.legado.app.data.AppDatabase
 import io.legado.app.help.ActivityHelp
+import io.legado.app.help.AppConfig
 import io.legado.app.help.CrashHandler
 import io.legado.app.help.ReadBookConfig
-import io.legado.app.help.isNightTheme
 import io.legado.app.lib.theme.ThemeStore
 import io.legado.app.ui.book.read.page.ChapterProvider
 import io.legado.app.utils.getCompatColor
@@ -50,7 +50,7 @@ class App : Application() {
         }
 
         if (!ThemeStore.isConfigured(this, versionCode)) applyTheme()
-        initNightTheme()
+        initNightMode()
 
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) createChannelId()
 
@@ -67,7 +67,7 @@ class App : Application() {
      * 更新主题
      */
     fun applyTheme() {
-        if (isNightTheme) {
+        if (AppConfig.isNightTheme) {
             ThemeStore.editTheme(this)
                 .primaryColor(
                     getPrefInt("colorPrimaryNight", getCompatColor(R.color.shine_color))
@@ -98,11 +98,11 @@ class App : Application() {
     fun applyDayNight() {
         ReadBookConfig.upBg()
         applyTheme()
-        initNightTheme()
+        initNightMode()
     }
 
-    private fun initNightTheme() {
-        val targetMode = if (isNightTheme) {
+    private fun initNightMode() {
+        val targetMode = if (AppConfig.isNightTheme) {
             AppCompatDelegate.MODE_NIGHT_YES
         } else {
             AppCompatDelegate.MODE_NIGHT_NO
diff --git a/app/src/main/java/io/legado/app/constant/Theme.kt b/app/src/main/java/io/legado/app/constant/Theme.kt
index 975eaa802..b8587997b 100644
--- a/app/src/main/java/io/legado/app/constant/Theme.kt
+++ b/app/src/main/java/io/legado/app/constant/Theme.kt
@@ -1,14 +1,13 @@
 package io.legado.app.constant
 
-import io.legado.app.App
-import io.legado.app.help.isNightTheme
+import io.legado.app.help.AppConfig
 
 enum class Theme {
     Dark, Light, Auto;
 
     companion object {
         fun getTheme(): Theme {
-            return if (App.INSTANCE.isNightTheme) {
+            return if (AppConfig.isNightTheme) {
                 Dark
             } else Light
         }
diff --git a/app/src/main/java/io/legado/app/help/AppConfig.kt b/app/src/main/java/io/legado/app/help/AppConfig.kt
new file mode 100644
index 000000000..8190cfd79
--- /dev/null
+++ b/app/src/main/java/io/legado/app/help/AppConfig.kt
@@ -0,0 +1,41 @@
+package io.legado.app.help
+
+import io.legado.app.App
+import io.legado.app.constant.PreferKey
+import io.legado.app.utils.getPrefBoolean
+import io.legado.app.utils.getPrefInt
+import io.legado.app.utils.putPrefBoolean
+import io.legado.app.utils.putPrefInt
+
+object AppConfig {
+
+    var isNightTheme: Boolean
+        get() = App.INSTANCE.getPrefBoolean("isNightTheme")
+        set(value) {
+            App.INSTANCE.putPrefBoolean("isNightTheme", value)
+        }
+
+    var isTransparentStatusBar: Boolean
+        get() = App.INSTANCE.getPrefBoolean("transparentStatusBar")
+        set(value) {
+            App.INSTANCE.putPrefBoolean("transparentStatusBar", value)
+        }
+
+    var isShowRSS: Boolean
+        get() = App.INSTANCE.getPrefBoolean(PreferKey.showRss)
+        set(value) {
+            App.INSTANCE.putPrefBoolean(PreferKey.showRss, value)
+        }
+
+    var threadCount: Int
+        get() = App.INSTANCE.getPrefInt(PreferKey.threadCount)
+        set(value) {
+            App.INSTANCE.putPrefInt(PreferKey.threadCount, value)
+        }
+
+    var autoDarkMode: Boolean
+        get() = App.INSTANCE.getPrefBoolean(PreferKey.autoDarkMode)
+        set(value) {
+            App.INSTANCE.putPrefBoolean(PreferKey.autoDarkMode, value)
+        }
+}
diff --git a/app/src/main/java/io/legado/app/help/PrefExtensions.kt b/app/src/main/java/io/legado/app/help/PrefExtensions.kt
deleted file mode 100644
index 4b8daf1e4..000000000
--- a/app/src/main/java/io/legado/app/help/PrefExtensions.kt
+++ /dev/null
@@ -1,21 +0,0 @@
-package io.legado.app.help
-
-import android.content.Context
-import io.legado.app.constant.PreferKey
-import io.legado.app.utils.getPrefBoolean
-import io.legado.app.utils.getPrefInt
-
-val Context.isNightTheme: Boolean
-    get() = getPrefBoolean("isNightTheme")
-
-val Context.isTransparentStatusBar: Boolean
-    get() = getPrefBoolean("transparentStatusBar", true)
-
-val Context.isShowRSS: Boolean
-    get() = getPrefBoolean(PreferKey.showRss, true)
-
-val Context.threadCount: Int
-    get() = getPrefInt(PreferKey.threadCount, 16)
-
-val Context.autoDarkMode: Boolean
-    get() = getPrefBoolean(PreferKey.autoDarkMode, true)
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/help/ReadBookConfig.kt b/app/src/main/java/io/legado/app/help/ReadBookConfig.kt
index 328433c3c..311093c13 100644
--- a/app/src/main/java/io/legado/app/help/ReadBookConfig.kt
+++ b/app/src/main/java/io/legado/app/help/ReadBookConfig.kt
@@ -111,7 +111,7 @@ object ReadBookConfig {
         var textSize: Int = 15
     ) {
         fun setBg(bgType: Int, bg: String) {
-            if (App.INSTANCE.isNightTheme) {
+            if (AppConfig.isNightTheme) {
                 bgTypeNight = bgType
                 bgStrNight = bg
             } else {
@@ -121,7 +121,7 @@ object ReadBookConfig {
         }
 
         fun setTextColor(color: Int) {
-            if (App.INSTANCE.isNightTheme) {
+            if (AppConfig.isNightTheme) {
                 textColorNight = "#${color.hexString}"
             } else {
                 textColor = "#${color.hexString}"
@@ -129,7 +129,7 @@ object ReadBookConfig {
         }
 
         fun setStatusIconDark(isDark: Boolean) {
-            if (App.INSTANCE.isNightTheme) {
+            if (AppConfig.isNightTheme) {
                 darkStatusIconNight = isDark
             } else {
                 darkStatusIcon = isDark
@@ -137,7 +137,7 @@ object ReadBookConfig {
         }
 
         fun statusIconDark(): Boolean {
-            return if (App.INSTANCE.isNightTheme) {
+            return if (AppConfig.isNightTheme) {
                 darkStatusIconNight
             } else {
                 darkStatusIcon
@@ -145,17 +145,17 @@ object ReadBookConfig {
         }
 
         fun textColor(): Int {
-            return if (App.INSTANCE.isNightTheme) Color.parseColor(textColorNight)
+            return if (AppConfig.isNightTheme) Color.parseColor(textColorNight)
             else Color.parseColor(textColor)
         }
 
         fun bgStr(): String {
-            return if (App.INSTANCE.isNightTheme) bgStrNight
+            return if (AppConfig.isNightTheme) bgStrNight
             else bgStr
         }
 
         fun bgType(): Int {
-            return if (App.INSTANCE.isNightTheme) bgTypeNight
+            return if (AppConfig.isNightTheme) bgTypeNight
             else bgType
         }
 
diff --git a/app/src/main/java/io/legado/app/lib/theme/ATH.kt b/app/src/main/java/io/legado/app/lib/theme/ATH.kt
index 91c7fcda2..c625e1807 100644
--- a/app/src/main/java/io/legado/app/lib/theme/ATH.kt
+++ b/app/src/main/java/io/legado/app/lib/theme/ATH.kt
@@ -16,8 +16,7 @@ import androidx.recyclerview.widget.RecyclerView
 import androidx.viewpager.widget.ViewPager
 import com.google.android.material.bottomnavigation.BottomNavigationView
 import io.legado.app.R
-import io.legado.app.help.isNightTheme
-import io.legado.app.help.isTransparentStatusBar
+import io.legado.app.help.AppConfig
 import io.legado.app.utils.getCompatColor
 import kotlinx.android.synthetic.main.activity_main.view.*
 import org.jetbrains.anko.backgroundColor
@@ -37,7 +36,7 @@ object ATH {
     }
 
     fun setStatusBarColorAuto(activity: Activity, fullScreen: Boolean) {
-        val isTransparentStatusBar = activity.isTransparentStatusBar
+        val isTransparentStatusBar = AppConfig.isTransparentStatusBar
         setStatusBarColor(
             activity,
             ThemeStore.statusBarColor(activity, isTransparentStatusBar),
@@ -131,14 +130,14 @@ object ATH {
     fun setTint(
         view: View,
         @ColorInt color: Int,
-        isDark: Boolean = view.context.isNightTheme
+        isDark: Boolean = AppConfig.isNightTheme
     ) {
         TintHelper.setTintAuto(view, color, false, isDark)
     }
 
     fun setBackgroundTint(
         view: View, @ColorInt color: Int,
-        isDark: Boolean = view.context.isNightTheme
+        isDark: Boolean = AppConfig.isNightTheme
     ) {
         TintHelper.setTintAuto(view, color, true, isDark)
     }
@@ -206,7 +205,7 @@ object ATH {
                 .setSelectedColor(ThemeStore.accentColor(bottom_navigation_view.context)).create()
             itemIconTintList = colorStateList
             itemTextColor = colorStateList
-            itemBackgroundResource = when(context.isNightTheme) {
+            itemBackgroundResource = when (AppConfig.isNightTheme) {
                 true -> R.drawable.item_bg_dark
                 false -> R.drawable.item_bg_light
             }
diff --git a/app/src/main/java/io/legado/app/service/DownloadService.kt b/app/src/main/java/io/legado/app/service/DownloadService.kt
index 6770f7db7..9c2e7a2f3 100644
--- a/app/src/main/java/io/legado/app/service/DownloadService.kt
+++ b/app/src/main/java/io/legado/app/service/DownloadService.kt
@@ -9,10 +9,10 @@ import io.legado.app.base.BaseService
 import io.legado.app.constant.Action
 import io.legado.app.constant.AppConst
 import io.legado.app.constant.Bus
+import io.legado.app.help.AppConfig
 import io.legado.app.help.BookHelp
 import io.legado.app.help.IntentHelp
 import io.legado.app.help.coroutine.Coroutine
-import io.legado.app.help.threadCount
 import io.legado.app.model.WebBook
 import io.legado.app.utils.postEvent
 import kotlinx.coroutines.Dispatchers.IO
@@ -21,7 +21,7 @@ import java.util.concurrent.Executors
 
 class DownloadService : BaseService() {
     private var searchPool =
-        Executors.newFixedThreadPool(App.INSTANCE.threadCount).asCoroutineDispatcher()
+        Executors.newFixedThreadPool(AppConfig.threadCount).asCoroutineDispatcher()
     private var tasks: ArrayList<Coroutine<*>> = arrayListOf()
     private val handler = Handler()
     private var runnable: Runnable = Runnable { upDownload() }
diff --git a/app/src/main/java/io/legado/app/ui/book/read/Help.kt b/app/src/main/java/io/legado/app/ui/book/read/Help.kt
index 9d1be9f0c..939377cb1 100644
--- a/app/src/main/java/io/legado/app/ui/book/read/Help.kt
+++ b/app/src/main/java/io/legado/app/ui/book/read/Help.kt
@@ -9,8 +9,8 @@ import android.view.Window
 import android.view.WindowManager
 import io.legado.app.App
 import io.legado.app.constant.PreferKey
+import io.legado.app.help.AppConfig
 import io.legado.app.help.ReadBookConfig
-import io.legado.app.help.isTransparentStatusBar
 import io.legado.app.lib.theme.ATH
 import io.legado.app.lib.theme.ThemeStore
 import io.legado.app.utils.getPrefBoolean
@@ -43,7 +43,7 @@ object Help {
         } else {
             ATH.setLightStatusBarAuto(
                 activity,
-                ThemeStore.statusBarColor(activity, activity.isTransparentStatusBar)
+                ThemeStore.statusBarColor(activity, AppConfig.isTransparentStatusBar)
             )
         }
     }
diff --git a/app/src/main/java/io/legado/app/ui/book/read/ReadMenu.kt b/app/src/main/java/io/legado/app/ui/book/read/ReadMenu.kt
index 972f89cb7..0583056cd 100644
--- a/app/src/main/java/io/legado/app/ui/book/read/ReadMenu.kt
+++ b/app/src/main/java/io/legado/app/ui/book/read/ReadMenu.kt
@@ -11,7 +11,7 @@ import androidx.core.view.isVisible
 import io.legado.app.App
 import io.legado.app.R
 import io.legado.app.constant.PreferKey
-import io.legado.app.help.isNightTheme
+import io.legado.app.help.AppConfig
 import io.legado.app.lib.theme.accentColor
 import io.legado.app.lib.theme.buttonDisabledColor
 import io.legado.app.service.help.ReadBook
@@ -42,7 +42,7 @@ class ReadMenu : FrameLayout {
     init {
         callBack = activity as? CallBack
         inflate(context, R.layout.view_read_menu, this)
-        if (context.isNightTheme) {
+        if (AppConfig.isNightTheme) {
             fabNightTheme.setImageResource(R.drawable.ic_daytime)
         } else {
             fabNightTheme.setImageResource(R.drawable.ic_brightness)
@@ -145,7 +145,7 @@ class ReadMenu : FrameLayout {
 
         //夜间模式
         fabNightTheme.onClick {
-            context.putPrefBoolean("isNightTheme", !context.isNightTheme)
+            context.putPrefBoolean("isNightTheme", !AppConfig.isNightTheme)
             App.INSTANCE.applyDayNight()
         }
 
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 00148a7fd..125204062 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
@@ -6,8 +6,8 @@ import io.legado.app.base.BaseViewModel
 import io.legado.app.constant.PreferKey
 import io.legado.app.data.entities.SearchBook
 import io.legado.app.data.entities.SearchKeyword
+import io.legado.app.help.AppConfig
 import io.legado.app.help.coroutine.Coroutine
-import io.legado.app.help.threadCount
 import io.legado.app.model.WebBook
 import io.legado.app.utils.getPrefBoolean
 import io.legado.app.utils.getPrefString
@@ -18,7 +18,7 @@ import java.util.concurrent.Executors
 
 class SearchViewModel(application: Application) : BaseViewModel(application) {
     private var searchPool =
-        Executors.newFixedThreadPool(context.threadCount).asCoroutineDispatcher()
+        Executors.newFixedThreadPool(AppConfig.threadCount).asCoroutineDispatcher()
     private var task: Coroutine<*>? = null
     var callBack: CallBack? = null
     var searchKey: String = ""
diff --git a/app/src/main/java/io/legado/app/ui/changesource/ChangeSourceViewModel.kt b/app/src/main/java/io/legado/app/ui/changesource/ChangeSourceViewModel.kt
index 81dfcebe9..3b16a4359 100644
--- a/app/src/main/java/io/legado/app/ui/changesource/ChangeSourceViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/changesource/ChangeSourceViewModel.kt
@@ -8,8 +8,8 @@ import io.legado.app.R
 import io.legado.app.base.BaseViewModel
 import io.legado.app.data.entities.Book
 import io.legado.app.data.entities.SearchBook
+import io.legado.app.help.AppConfig
 import io.legado.app.help.coroutine.Coroutine
-import io.legado.app.help.threadCount
 import io.legado.app.model.WebBook
 import kotlinx.coroutines.Dispatchers.IO
 import kotlinx.coroutines.Dispatchers.Main
@@ -20,7 +20,7 @@ import java.util.concurrent.Executors
 
 class ChangeSourceViewModel(application: Application) : BaseViewModel(application) {
     private var searchPool =
-        Executors.newFixedThreadPool(context.threadCount).asCoroutineDispatcher()
+        Executors.newFixedThreadPool(AppConfig.threadCount).asCoroutineDispatcher()
     var callBack: CallBack? = null
     val searchStateData = MutableLiveData<Boolean>()
     var name: String = ""
diff --git a/app/src/main/java/io/legado/app/ui/config/OtherConfigFragment.kt b/app/src/main/java/io/legado/app/ui/config/OtherConfigFragment.kt
index 07a5a641d..2645002fe 100644
--- a/app/src/main/java/io/legado/app/ui/config/OtherConfigFragment.kt
+++ b/app/src/main/java/io/legado/app/ui/config/OtherConfigFragment.kt
@@ -12,8 +12,8 @@ import io.legado.app.App
 import io.legado.app.R
 import io.legado.app.constant.Bus
 import io.legado.app.constant.PreferKey
+import io.legado.app.help.AppConfig
 import io.legado.app.help.BookHelp
-import io.legado.app.help.threadCount
 import io.legado.app.lib.theme.ATH
 import io.legado.app.receiver.SharedReceiverActivity
 import io.legado.app.ui.filechooser.FileChooserDialog
@@ -61,7 +61,7 @@ class OtherConfigFragment : PreferenceFragmentCompat(),
                 .setTitle(getString(R.string.threads_num_title))
                 .setMaxValue(999)
                 .setMinValue(1)
-                .setValue(requireContext().threadCount)
+                .setValue(AppConfig.threadCount)
                 .show {
                     requireContext().putPrefInt(PreferKey.threadCount, it)
                     findPreference<Preference>(PreferKey.threadCount)?.summary =
@@ -125,7 +125,7 @@ class OtherConfigFragment : PreferenceFragmentCompat(),
             PreferKey.downloadPath -> getPrefString(PreferKey.downloadPath)
                 ?: App.INSTANCE.getExternalFilesDir(null)?.absolutePath
                 ?: App.INSTANCE.cacheDir.absolutePath
-            PreferKey.threadCount -> requireContext().threadCount
+            PreferKey.threadCount -> AppConfig.threadCount
             else -> getPrefString(key) ?: ""
         }
     }
diff --git a/app/src/main/java/io/legado/app/ui/main/MainActivity.kt b/app/src/main/java/io/legado/app/ui/main/MainActivity.kt
index 0b47b24f6..bdaf72031 100644
--- a/app/src/main/java/io/legado/app/ui/main/MainActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/main/MainActivity.kt
@@ -16,8 +16,8 @@ import io.legado.app.R
 import io.legado.app.base.VMBaseActivity
 import io.legado.app.constant.Bus
 import io.legado.app.constant.PreferKey
+import io.legado.app.help.AppConfig
 import io.legado.app.help.coroutine.Coroutine
-import io.legado.app.help.isShowRSS
 import io.legado.app.help.storage.Backup
 import io.legado.app.lib.theme.ATH
 import io.legado.app.service.BaseReadAloudService
@@ -47,7 +47,7 @@ class MainActivity : VMBaseActivity<MainViewModel>(R.layout.activity_main),
         view_pager_main.adapter = TabFragmentPageAdapter(supportFragmentManager)
         view_pager_main.addOnPageChangeListener(this)
         bottom_navigation_view.setOnNavigationItemSelectedListener(this)
-        bottom_navigation_view.menu.findItem(R.id.menu_rss).isVisible = isShowRSS
+        bottom_navigation_view.menu.findItem(R.id.menu_rss).isVisible = AppConfig.isShowRSS
         upVersion()
     }
 
@@ -68,10 +68,10 @@ class MainActivity : VMBaseActivity<MainViewModel>(R.layout.activity_main),
             fragmentList.add(RssFragment())
             fragmentList.add(MyFragment())
         }
-        if (isShowRSS && fragmentList.size < 4) {
+        if (AppConfig.isShowRSS && fragmentList.size < 4) {
             fragmentList.add(2, RssFragment())
         }
-        if (!isShowRSS && fragmentList.size == 4) {
+        if (!AppConfig.isShowRSS && fragmentList.size == 4) {
             fragmentList.removeAt(2)
         }
     }
@@ -89,7 +89,7 @@ class MainActivity : VMBaseActivity<MainViewModel>(R.layout.activity_main),
         pagePosition = position
         when (position) {
             0, 1, 3 -> bottom_navigation_view.menu.getItem(position).isChecked = true
-            2 -> if (isShowRSS) {
+            2 -> if (AppConfig.isShowRSS) {
                 bottom_navigation_view.menu.getItem(position).isChecked = true
             } else {
                 bottom_navigation_view.menu.getItem(3).isChecked = true
@@ -147,10 +147,10 @@ class MainActivity : VMBaseActivity<MainViewModel>(R.layout.activity_main),
             recreate()
         }
         observeEvent<String>(Bus.SHOW_RSS) {
-            bottom_navigation_view.menu.findItem(R.id.menu_rss).isVisible = isShowRSS
+            bottom_navigation_view.menu.findItem(R.id.menu_rss).isVisible = AppConfig.isShowRSS
             upFragmentList()
             view_pager_main.adapter?.notifyDataSetChanged()
-            if (isShowRSS) {
+            if (AppConfig.isShowRSS) {
                 view_pager_main.setCurrentItem(3, false)
             }
         }
@@ -168,7 +168,7 @@ class MainActivity : VMBaseActivity<MainViewModel>(R.layout.activity_main),
         }
 
         override fun getCount(): Int {
-            return if (isShowRSS) 4 else 3
+            return if (AppConfig.isShowRSS) 4 else 3
         }
 
     }