diff --git a/app/src/main/assets/updateLog.md b/app/src/main/assets/updateLog.md
index 3302fbfff..80066583d 100644
--- a/app/src/main/assets/updateLog.md
+++ b/app/src/main/assets/updateLog.md
@@ -3,6 +3,10 @@
 * 旧版数据导入教程：
 * 先在旧版阅读(2.x)中进行备份，然后在新版阅读(3.x)【我的】->【备份与恢复】，选择【导入旧版本数据】。
 
+**2020/01/27**
+* 添加根据系统主题切换夜间模式
+* 合并Modificator提交的代码
+
 **2020/01/26**
 * 修复bug
 * 未加入书架可查看目录
diff --git a/app/src/main/java/io/legado/app/App.kt b/app/src/main/java/io/legado/app/App.kt
index ee3e4f5f6..64d6abf9d 100644
--- a/app/src/main/java/io/legado/app/App.kt
+++ b/app/src/main/java/io/legado/app/App.kt
@@ -15,13 +15,13 @@ 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.lib.theme.ThemeStore
 import io.legado.app.ui.book.read.page.ChapterProvider
 import io.legado.app.utils.getCompatColor
 import io.legado.app.utils.getPrefInt
-import io.legado.app.utils.isNightTheme
 
 @Suppress("DEPRECATION")
 class App : Application() {
@@ -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))
@@ -98,15 +98,16 @@ class App : Application() {
     fun applyDayNight() {
         ReadBookConfig.upBg()
         applyTheme()
-        initNightTheme()
+        initNightMode()
     }
 
-    private fun initNightTheme() {
-        val targetMode = if (isNightTheme) {
-            AppCompatDelegate.MODE_NIGHT_YES
-        } else {
-            AppCompatDelegate.MODE_NIGHT_NO
-        }
+    private fun initNightMode() {
+        val targetMode =
+            if (AppConfig.isNightTheme) {
+                AppCompatDelegate.MODE_NIGHT_YES
+            } else {
+                AppCompatDelegate.MODE_NIGHT_NO
+            }
         AppCompatDelegate.setDefaultNightMode(targetMode)
     }
 
diff --git a/app/src/main/java/io/legado/app/base/BaseActivity.kt b/app/src/main/java/io/legado/app/base/BaseActivity.kt
index 2517cc616..048036892 100644
--- a/app/src/main/java/io/legado/app/base/BaseActivity.kt
+++ b/app/src/main/java/io/legado/app/base/BaseActivity.kt
@@ -52,8 +52,8 @@ abstract class BaseActivity(
         } ?: super.onCreateOptionsMenu(menu)
     }
 
-    override fun onMenuOpened(featureId: Int, menu: Menu?): Boolean {
-        menu?.applyOpenTint(this)
+    override fun onMenuOpened(featureId: Int, menu: Menu): Boolean {
+        menu.applyOpenTint(this)
         return super.onMenuOpened(featureId, menu)
     }
 
diff --git a/app/src/main/java/io/legado/app/constant/PreferKey.kt b/app/src/main/java/io/legado/app/constant/PreferKey.kt
index 80efd5925..1cb5e2edc 100644
--- a/app/src/main/java/io/legado/app/constant/PreferKey.kt
+++ b/app/src/main/java/io/legado/app/constant/PreferKey.kt
@@ -21,4 +21,5 @@ object PreferKey {
     const val backupPath = "backupUri"
     const val threadCount = "threadCount"
     const val keepLight = "keep_light"
+    const val autoDarkMode = "autoDarkMode"
 }
\ No newline at end of file
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 40467a688..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.utils.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..f51d7b479
--- /dev/null
+++ b/app/src/main/java/io/legado/app/help/AppConfig.kt
@@ -0,0 +1,51 @@
+package io.legado.app.help
+
+import io.legado.app.App
+import io.legado.app.constant.PreferKey
+import io.legado.app.utils.*
+
+object AppConfig {
+
+    var isNightTheme: Boolean
+        get() {
+            return when (App.INSTANCE.getPrefString("themeMode", "0")) {
+                "1" -> false
+                "2" -> true
+                else -> App.INSTANCE.sysIsDarkMode()
+            }
+        }
+        set(value) {
+            if (value) {
+                App.INSTANCE.putPrefString("themeMode", "2")
+            } else {
+                App.INSTANCE.putPrefString("themeMode", "1")
+            }
+        }
+
+    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)
+        }
+
+    val isEInkMode: Boolean
+        get() = App.INSTANCE.getPrefBoolean("isEInkMode")
+}
diff --git a/app/src/main/java/io/legado/app/help/BookHelp.kt b/app/src/main/java/io/legado/app/help/BookHelp.kt
index ff5ee0b7d..2c1330b12 100644
--- a/app/src/main/java/io/legado/app/help/BookHelp.kt
+++ b/app/src/main/java/io/legado/app/help/BookHelp.kt
@@ -1,19 +1,19 @@
 package io.legado.app.help
 
+import android.net.Uri
+import androidx.documentfile.provider.DocumentFile
 import io.legado.app.App
 import io.legado.app.constant.PreferKey
 import io.legado.app.data.entities.Book
 import io.legado.app.data.entities.BookChapter
 import io.legado.app.data.entities.ReplaceRule
-import io.legado.app.utils.MD5Utils
-import io.legado.app.utils.getPrefInt
-import io.legado.app.utils.getPrefString
+import io.legado.app.utils.*
 import org.apache.commons.text.similarity.JaccardSimilarity
 import java.io.File
 import kotlin.math.min
 
 object BookHelp {
-
+    private const val cacheFolderName = "book_cache"
     private var downloadPath: String =
         App.INSTANCE.getPrefString(PreferKey.downloadPath)
             ?: App.INSTANCE.getExternalFilesDir(null)?.absolutePath
@@ -26,76 +26,127 @@ object BookHelp {
                         ?: App.INSTANCE.cacheDir.absolutePath
     }
 
+    private val downloadUri get() = Uri.parse(downloadPath)
+
+    private fun bookFolderName(book: Book): String {
+        return formatFolderName(book.name) + MD5Utils.md5Encode16(book.bookUrl)
+    }
+
+    private fun bookChapterName(bookChapter: BookChapter): String {
+        return String.format("%05d-%s", bookChapter.index, MD5Utils.md5Encode(bookChapter.title))
+    }
+
     private fun getBookCachePath(): String {
-        return "$downloadPath${File.separator}book_cache"
+        return "$downloadPath${File.separator}$cacheFolderName"
     }
 
     fun clearCache() {
-        FileHelp.deleteFile(getBookCachePath())
-        FileHelp.getFolder(getBookCachePath())
+        FileUtils.deleteFile(getBookCachePath())
+        FileUtils.getFolder(getBookCachePath())
     }
 
     @Synchronized
     fun saveContent(book: Book, bookChapter: BookChapter, content: String) {
         if (content.isEmpty()) return
-        FileHelp.getFolder(getBookFolder(book)).listFiles()?.forEach {
-            if (it.name.startsWith(String.format("%05d", bookChapter.index))) {
-                it.delete()
-                return@forEach
+        if (downloadUri.isDocumentUri(App.INSTANCE)) {
+            DocumentFile.fromTreeUri(App.INSTANCE, downloadUri)?.let {
+                DocumentUtils.createFileIfNotExist(
+                    it,
+                    "${bookChapterName(bookChapter)}.nb",
+                    subDirs = *arrayOf(cacheFolderName, bookFolderName(book))
+                )?.uri?.writeText(App.INSTANCE, content)
             }
+        } else {
+            FileUtils.createFileIfNotExist(
+                File(downloadPath),
+                subDirs = *arrayOf(cacheFolderName, bookFolderName(book))
+            ).listFiles()?.forEach {
+                if (it.name.startsWith(String.format("%05d", bookChapter.index))) {
+                    it.delete()
+                    return@forEach
+                }
+            }
+            FileUtils.createFileIfNotExist(
+                File(downloadPath),
+                "${bookChapterName(bookChapter)}.nb",
+                subDirs = *arrayOf(cacheFolderName, bookFolderName(book))
+            ).writeText(content)
         }
-        val filePath = getChapterPath(book, bookChapter)
-        val file = FileHelp.getFile(filePath)
-        file.writeText(content)
     }
 
     fun getChapterCount(book: Book): Int {
-        return FileHelp.getFolder(getBookFolder(book)).list()?.size ?: 0
+        if (downloadUri.isDocumentUri(App.INSTANCE)) {
+            DocumentFile.fromTreeUri(App.INSTANCE, downloadUri)?.let {
+                return DocumentUtils.createFileIfNotExist(
+                    it,
+                    subDirs = *arrayOf(cacheFolderName, bookFolderName(book))
+                )?.listFiles()?.size ?: 0
+            }
+        } else {
+            return FileUtils.createFileIfNotExist(
+                File(downloadPath),
+                subDirs = *arrayOf(cacheFolderName, bookFolderName(book))
+            ).list()?.size ?: 0
+        }
+        return 0
     }
 
     fun hasContent(book: Book, bookChapter: BookChapter): Boolean {
-        val filePath = getChapterPath(book, bookChapter)
-        runCatching {
-            val file = File(filePath)
-            if (file.exists()) {
-                return true
+        if (downloadUri.isDocumentUri(App.INSTANCE)) {
+            DocumentFile.fromTreeUri(App.INSTANCE, downloadUri)?.let {
+                return DocumentUtils.exists(
+                    it,
+                    "${bookChapterName(bookChapter)}.nb",
+                    subDirs = *arrayOf(cacheFolderName, bookFolderName(book))
+                )
             }
+        } else {
+            return FileUtils.exists(
+                File(downloadPath),
+                "${bookChapterName(bookChapter)}.nb",
+                subDirs = *arrayOf(cacheFolderName, bookFolderName(book))
+            )
         }
         return false
     }
 
     fun getContent(book: Book, bookChapter: BookChapter): String? {
-        val filePath = getChapterPath(book, bookChapter)
-        runCatching {
-            val file = File(filePath)
-            if (file.exists()) {
-                return file.readText()
+        if (downloadUri.isDocumentUri(App.INSTANCE)) {
+            DocumentFile.fromTreeUri(App.INSTANCE, downloadUri)?.let {
+                return DocumentUtils.createFileIfNotExist(
+                    it,
+                    "${bookChapterName(bookChapter)}.nb",
+                    subDirs = *arrayOf(cacheFolderName, bookFolderName(book))
+                )?.uri?.readText(App.INSTANCE)
             }
+        } else {
+            return FileUtils.createFileIfNotExist(
+                File(downloadPath),
+                "${bookChapterName(bookChapter)}.nb",
+                subDirs = *arrayOf(cacheFolderName, bookFolderName(book))
+            ).readText()
         }
         return null
     }
 
     fun delContent(book: Book, bookChapter: BookChapter) {
-        val filePath = getChapterPath(book, bookChapter)
-        kotlin.runCatching {
-            val file = File(filePath)
-            if (file.exists()) {
-                file.delete()
+        if (downloadUri.isDocumentUri(App.INSTANCE)) {
+            DocumentFile.fromTreeUri(App.INSTANCE, downloadUri)?.let {
+                DocumentUtils.createFileIfNotExist(
+                    it,
+                    "${bookChapterName(bookChapter)}.nb",
+                    subDirs = *arrayOf(cacheFolderName, bookFolderName(book))
+                )?.delete()
             }
+        } else {
+            FileUtils.createFileIfNotExist(
+                File(downloadPath),
+                "${bookChapterName(bookChapter)}.nb",
+                subDirs = *arrayOf(cacheFolderName, bookFolderName(book))
+            ).delete()
         }
     }
 
-    private fun getBookFolder(book: Book): String {
-        val bookFolder = formatFolderName(book.name + MD5Utils.md5Encode16(book.bookUrl))
-        return "${getBookCachePath()}${File.separator}$bookFolder"
-    }
-
-    private fun getChapterPath(book: Book, bookChapter: BookChapter): String {
-        val chapterFile =
-            String.format("%05d-%s", bookChapter.index, MD5Utils.md5Encode(bookChapter.title))
-        return "${getBookFolder(book)}${File.separator}$chapterFile.nb"
-    }
-
     private fun formatFolderName(folderName: String): String {
         return folderName.replace("[\\\\/:*?\"<>|.]".toRegex(), "")
     }
@@ -124,16 +175,16 @@ object BookHelp {
         }
 
         var newIndex = 0
-        val jaccardSimilarity = JaccardSimilarity()
+        val jSimilarity = JaccardSimilarity()
         var similarity = if (chapters.size > index) {
-            jaccardSimilarity.apply(title, chapters[index].title)
+            jSimilarity.apply(title, chapters[index].title)
         } else 0.0
         if (similarity == 1.0) {
             return index
         } else {
             for (i in 1..50) {
                 if (index - i in chapters.indices) {
-                    jaccardSimilarity.apply(title, chapters[index - i].title).let {
+                    jSimilarity.apply(title, chapters[index - i].title).let {
                         if (it > similarity) {
                             similarity = it
                             newIndex = index - i
@@ -144,7 +195,7 @@ object BookHelp {
                     }
                 }
                 if (index + i in chapters.indices) {
-                    jaccardSimilarity.apply(title, chapters[index + i].title).let {
+                    jSimilarity.apply(title, chapters[index + i].title).let {
                         if (it > similarity) {
                             similarity = it
                             newIndex = index + i
diff --git a/app/src/main/java/io/legado/app/help/FileHelp.kt b/app/src/main/java/io/legado/app/help/FileHelp.kt
deleted file mode 100644
index 5a7678563..000000000
--- a/app/src/main/java/io/legado/app/help/FileHelp.kt
+++ /dev/null
@@ -1,58 +0,0 @@
-package io.legado.app.help
-
-import io.legado.app.App
-import java.io.File
-import java.io.IOException
-
-object FileHelp {
-
-
-    //获取文件夹
-    fun getFolder(filePath: String): File {
-        val file = File(filePath)
-        //如果文件夹不存在，就创建它
-        if (!file.exists()) {
-            file.mkdirs()
-        }
-        return file
-    }
-
-    //获取文件
-    @Synchronized
-    fun getFile(filePath: String): File {
-        val file = File(filePath)
-        try {
-            if (!file.exists()) {
-                //创建父类文件夹
-                getFolder(file.parent)
-                //创建文件
-                file.createNewFile()
-            }
-        } catch (e: IOException) {
-            e.printStackTrace()
-        }
-        return file
-    }
-
-    fun getCachePath(): String {
-        return App.INSTANCE.externalCacheDir?.absolutePath
-            ?: App.INSTANCE.cacheDir.absolutePath
-    }
-
-    //递归删除文件夹下的数据
-    @Synchronized
-    fun deleteFile(filePath: String) {
-        val file = File(filePath)
-        if (!file.exists()) return
-
-        if (file.isDirectory) {
-            val files = file.listFiles()
-            files?.forEach { subFile ->
-                val path = subFile.path
-                deleteFile(path)
-            }
-        }
-        //删除文件
-        file.delete()
-    }
-}
\ No newline at end of file
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 9a41707a1..000000000
--- a/app/src/main/java/io/legado/app/help/PrefExtensions.kt
+++ /dev/null
@@ -1,13 +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.isShowRSS: Boolean
-    get() = getPrefBoolean(PreferKey.showRss, true)
-
-val Context.threadCount: Int
-    get() = getPrefInt(PreferKey.threadCount, 16)
\ 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/help/storage/Backup.kt b/app/src/main/java/io/legado/app/help/storage/Backup.kt
index 90bf3b9e2..8a635bafc 100644
--- a/app/src/main/java/io/legado/app/help/storage/Backup.kt
+++ b/app/src/main/java/io/legado/app/help/storage/Backup.kt
@@ -4,7 +4,6 @@ import android.content.Context
 import android.net.Uri
 import androidx.documentfile.provider.DocumentFile
 import io.legado.app.App
-import io.legado.app.help.FileHelp
 import io.legado.app.help.ReadBookConfig
 import io.legado.app.utils.DocumentUtils
 import io.legado.app.utils.FileUtils
@@ -48,37 +47,40 @@ object Backup {
             App.db.bookDao().allBooks.let {
                 if (it.isNotEmpty()) {
                     val json = GSON.toJson(it)
-                    FileHelp.getFile(backupPath + File.separator + "bookshelf.json").writeText(json)
+                    FileUtils.getFile(backupPath + File.separator + "bookshelf.json")
+                        .writeText(json)
                 }
             }
             App.db.bookGroupDao().all().let {
                 if (it.isNotEmpty()) {
                     val json = GSON.toJson(it)
-                    FileHelp.getFile(backupPath + File.separator + "bookGroup.json").writeText(json)
+                    FileUtils.getFile(backupPath + File.separator + "bookGroup.json")
+                        .writeText(json)
                 }
             }
             App.db.bookSourceDao().all.let {
                 if (it.isNotEmpty()) {
                     val json = GSON.toJson(it)
-                    FileHelp.getFile(backupPath + File.separator + "bookSource.json")
+                    FileUtils.getFile(backupPath + File.separator + "bookSource.json")
                         .writeText(json)
                 }
             }
             App.db.rssSourceDao().all.let {
                 if (it.isNotEmpty()) {
                     val json = GSON.toJson(it)
-                    FileHelp.getFile(backupPath + File.separator + "rssSource.json").writeText(json)
+                    FileUtils.getFile(backupPath + File.separator + "rssSource.json")
+                        .writeText(json)
                 }
             }
             App.db.replaceRuleDao().all.let {
                 if (it.isNotEmpty()) {
                     val json = GSON.toJson(it)
-                    FileHelp.getFile(backupPath + File.separator + "replaceRule.json")
+                    FileUtils.getFile(backupPath + File.separator + "replaceRule.json")
                         .writeText(json)
                 }
             }
             GSON.toJson(ReadBookConfig.configList)?.let {
-                FileHelp.getFile(backupPath + File.separator + ReadBookConfig.readConfigFileName)
+                FileUtils.getFile(backupPath + File.separator + ReadBookConfig.readConfigFileName)
                     .writeText(it)
             }
             Preferences.getSharedPreferences(App.INSTANCE, backupPath, "config")?.let { sp ->
@@ -111,7 +113,7 @@ object Backup {
                 doc?.let {
                     DocumentUtils.writeText(
                         context,
-                        FileHelp.getFile(backupPath + File.separator + fileName).readText(),
+                        FileUtils.getFile(backupPath + File.separator + fileName).readText(),
                         doc.uri
                     )
                 }
@@ -122,8 +124,8 @@ object Backup {
     private fun copyBackup() {
         try {
             for (fileName in backupFileNames) {
-                FileHelp.getFile(backupPath + File.separator + "bookshelf.json")
-                    .copyTo(FileHelp.getFile(legadoPath + File.separator + "bookshelf.json"), true)
+                FileUtils.getFile(backupPath + File.separator + "bookshelf.json")
+                    .copyTo(FileUtils.getFile(legadoPath + File.separator + "bookshelf.json"), true)
             }
         } catch (e: Exception) {
             e.printStackTrace()
diff --git a/app/src/main/java/io/legado/app/help/storage/Restore.kt b/app/src/main/java/io/legado/app/help/storage/Restore.kt
index 15c14051c..6741e6830 100644
--- a/app/src/main/java/io/legado/app/help/storage/Restore.kt
+++ b/app/src/main/java/io/legado/app/help/storage/Restore.kt
@@ -11,7 +11,6 @@ import com.jayway.jsonpath.ParseContext
 import io.legado.app.App
 import io.legado.app.constant.AppConst
 import io.legado.app.data.entities.*
-import io.legado.app.help.FileHelp
 import io.legado.app.help.ReadBookConfig
 import io.legado.app.utils.*
 import kotlinx.coroutines.Dispatchers.IO
@@ -38,7 +37,7 @@ object Restore {
                 for (fileName in Backup.backupFileNames) {
                     if (doc.name == fileName) {
                         DocumentUtils.readText(context, doc.uri)?.let {
-                            FileHelp.getFile(Backup.backupPath + File.separator + fileName)
+                            FileUtils.getFile(Backup.backupPath + File.separator + fileName)
                                 .writeText(it)
                         }
                     }
@@ -51,7 +50,7 @@ object Restore {
     suspend fun restore(path: String) {
         withContext(IO) {
             try {
-                val file = FileHelp.getFile(path + File.separator + "bookshelf.json")
+                val file = FileUtils.getFile(path + File.separator + "bookshelf.json")
                 val json = file.readText()
                 GSON.fromJsonArray<Book>(json)?.let {
                     App.db.bookDao().insert(*it.toTypedArray())
@@ -60,7 +59,7 @@ object Restore {
                 e.printStackTrace()
             }
             try {
-                val file = FileHelp.getFile(path + File.separator + "bookGroup.json")
+                val file = FileUtils.getFile(path + File.separator + "bookGroup.json")
                 val json = file.readText()
                 GSON.fromJsonArray<BookGroup>(json)?.let {
                     App.db.bookGroupDao().insert(*it.toTypedArray())
@@ -69,7 +68,7 @@ object Restore {
                 e.printStackTrace()
             }
             try {
-                val file = FileHelp.getFile(path + File.separator + "bookSource.json")
+                val file = FileUtils.getFile(path + File.separator + "bookSource.json")
                 val json = file.readText()
                 GSON.fromJsonArray<BookSource>(json)?.let {
                     App.db.bookSourceDao().insert(*it.toTypedArray())
@@ -78,7 +77,7 @@ object Restore {
                 e.printStackTrace()
             }
             try {
-                val file = FileHelp.getFile(path + File.separator + "rssSource.json")
+                val file = FileUtils.getFile(path + File.separator + "rssSource.json")
                 val json = file.readText()
                 GSON.fromJsonArray<RssSource>(json)?.let {
                     App.db.rssSourceDao().insert(*it.toTypedArray())
@@ -87,7 +86,7 @@ object Restore {
                 e.printStackTrace()
             }
             try {
-                val file = FileHelp.getFile(path + File.separator + "replaceRule.json")
+                val file = FileUtils.getFile(path + File.separator + "replaceRule.json")
                 val json = file.readText()
                 GSON.fromJsonArray<ReplaceRule>(json)?.let {
                     App.db.replaceRuleDao().insert(*it.toTypedArray())
@@ -97,7 +96,7 @@ object Restore {
             }
             try {
                 val file =
-                    FileHelp.getFile(path + File.separator + ReadBookConfig.readConfigFileName)
+                    FileUtils.getFile(path + File.separator + ReadBookConfig.readConfigFileName)
                 val configFile =
                     File(App.INSTANCE.filesDir.absolutePath + File.separator + ReadBookConfig.readConfigFileName)
                 if (file.exists()) {
@@ -126,7 +125,7 @@ object Restore {
         GlobalScope.launch(IO) {
             try {// 导入书架
                 val shelfFile =
-                    FileHelp.getFile(Backup.defaultPath + File.separator + "myBookShelf.json")
+                    FileUtils.getFile(Backup.defaultPath + File.separator + "myBookShelf.json")
                 val json = shelfFile.readText()
                 val importCount = importOldBookshelf(json)
                 withContext(Main) {
@@ -140,7 +139,7 @@ object Restore {
 
             try {// Book source
                 val sourceFile =
-                    FileHelp.getFile(Backup.defaultPath + File.separator + "myBookSource.json")
+                    FileUtils.getFile(Backup.defaultPath + File.separator + "myBookSource.json")
                 val json = sourceFile.readText()
                 val importCount = importOldSource(json)
                 withContext(Main) {
@@ -154,7 +153,7 @@ object Restore {
 
             try {// Replace rules
                 val ruleFile =
-                    FileHelp.getFile(Backup.defaultPath + File.separator + "myBookReplaceRule.json")
+                    FileUtils.getFile(Backup.defaultPath + File.separator + "myBookReplaceRule.json")
                 val json = ruleFile.readText()
                 val importCount = importOldReplaceRule(json)
                 withContext(Main) {
diff --git a/app/src/main/java/io/legado/app/help/storage/WebDavHelp.kt b/app/src/main/java/io/legado/app/help/storage/WebDavHelp.kt
index 7d905299d..fb2e09a15 100644
--- a/app/src/main/java/io/legado/app/help/storage/WebDavHelp.kt
+++ b/app/src/main/java/io/legado/app/help/storage/WebDavHelp.kt
@@ -2,10 +2,10 @@ package io.legado.app.help.storage
 
 import android.content.Context
 import io.legado.app.App
-import io.legado.app.help.FileHelp
 import io.legado.app.help.coroutine.Coroutine
 import io.legado.app.lib.webdav.WebDav
 import io.legado.app.lib.webdav.http.HttpAuth
+import io.legado.app.utils.FileUtils
 import io.legado.app.utils.ZipUtils
 import io.legado.app.utils.getPrefString
 import kotlinx.coroutines.Dispatchers.IO
@@ -17,9 +17,9 @@ import java.util.*
 import kotlin.math.min
 
 object WebDavHelp {
-    private val zipFilePath = FileHelp.getCachePath() + "/backup" + ".zip"
+    private val zipFilePath = FileUtils.getCachePath() + "/backup" + ".zip"
     private val unzipFilesPath by lazy {
-        FileHelp.getCachePath()
+        FileUtils.getCachePath()
     }
 
     private fun getWebDavUrl(): String? {
@@ -86,7 +86,7 @@ object WebDavHelp {
             for (i in 0 until paths.size) {
                 paths[i] = path + File.separator + paths[i]
             }
-            FileHelp.deleteFile(zipFilePath)
+            FileUtils.deleteFile(zipFilePath)
             if (ZipUtils.zipFiles(paths, zipFilePath)) {
                 WebDav(getWebDavUrl() + "legado").makeAsDir()
                 val putUrl = getWebDavUrl() + "legado/backup" +
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 46622b869..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
@@ -5,7 +5,6 @@ import android.app.Activity
 import android.app.ActivityManager
 import android.content.Context
 import android.graphics.Color
-import android.graphics.drawable.ColorDrawable
 import android.os.Build
 import android.view.View
 import android.view.View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR
@@ -17,9 +16,8 @@ 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.AppConfig
 import io.legado.app.utils.getCompatColor
-import io.legado.app.utils.isNightTheme
-import io.legado.app.utils.isTransparentStatusBar
 import kotlinx.android.synthetic.main.activity_main.view.*
 import org.jetbrains.anko.backgroundColor
 
@@ -38,7 +36,7 @@ object ATH {
     }
 
     fun setStatusBarColorAuto(activity: Activity, fullScreen: Boolean) {
-        val isTransparentStatusBar = activity.isTransparentStatusBar
+        val isTransparentStatusBar = AppConfig.isTransparentStatusBar
         setStatusBarColor(
             activity,
             ThemeStore.statusBarColor(activity, isTransparentStatusBar),
@@ -132,14 +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)
     }
@@ -207,11 +205,10 @@ object ATH {
                 .setSelectedColor(ThemeStore.accentColor(bottom_navigation_view.context)).create()
             itemIconTintList = colorStateList
             itemTextColor = colorStateList
-            itemBackground = ColorDrawable(ThemeStore.primaryColor(bottomBar.context))
-            /*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/service/HttpReadAloudService.kt b/app/src/main/java/io/legado/app/service/HttpReadAloudService.kt
index c2467c1eb..b12fef048 100644
--- a/app/src/main/java/io/legado/app/service/HttpReadAloudService.kt
+++ b/app/src/main/java/io/legado/app/service/HttpReadAloudService.kt
@@ -4,14 +4,10 @@ import android.app.PendingIntent
 import android.media.MediaPlayer
 import io.legado.app.constant.Bus
 import io.legado.app.data.api.IHttpPostApi
-import io.legado.app.help.FileHelp
 import io.legado.app.help.IntentHelp
 import io.legado.app.help.http.HttpHelper
 import io.legado.app.service.help.ReadBook
-import io.legado.app.utils.LogUtils
-import io.legado.app.utils.getPrefInt
-import io.legado.app.utils.getPrefString
-import io.legado.app.utils.postEvent
+import io.legado.app.utils.*
 import kotlinx.coroutines.Dispatchers.IO
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.isActive
@@ -65,7 +61,7 @@ class HttpReadAloudService : BaseReadAloudService(),
 
     private fun downloadAudio() {
         job = launch(IO) {
-            FileHelp.deleteFile(ttsFolder)
+            FileUtils.deleteFile(ttsFolder)
             for (index in 0 until contentList.size) {
                 if (isActive) {
                     val bytes = HttpHelper.getByteRetrofit("http://tts.baidu.com")
@@ -104,7 +100,7 @@ class HttpReadAloudService : BaseReadAloudService(),
     }
 
     private fun getSpeakFile(index: Int = nowSpeak): File {
-        return FileHelp.getFile("${ttsFolder}${File.separator}${index}.mp3")
+        return FileUtils.getFile("${ttsFolder}${File.separator}${index}.mp3")
     }
 
     private fun getAudioBody(content: String): Map<String, String> {
diff --git a/app/src/main/java/io/legado/app/ui/README.md b/app/src/main/java/io/legado/app/ui/README.md
index 18c04f014..a1a7a2313 100644
--- a/app/src/main/java/io/legado/app/ui/README.md
+++ b/app/src/main/java/io/legado/app/ui/README.md
@@ -1 +1,24 @@
-## 放置与界面有关的类
\ No newline at end of file
+## 放置与界面有关的类
+
+* about 关于界面
+* audio 音频播放界面
+* book\info 书籍信息查看
+* book\read 书籍阅读界面
+* book\search 搜索书籍界面
+* book\source 搜索书源界面
+* changecover 封面换源界面
+* changesource 换源界面
+* chapterlist 目录界面
+* config 配置界面
+* download 下载界面
+* explore 发现界面
+* filechooser 文件选择界面
+* importbook 书籍导入界面
+* main 主界面
+* qrcode 二维码扫描界面
+* replacerule 替换净化界面
+* rss\article 订阅条目界面
+* rss\read 订阅阅读界面
+* rss\source 订阅源界面
+* welcome 欢迎界面
+* widget 自定义插件
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/ui/book/info/BookInfoActivity.kt b/app/src/main/java/io/legado/app/ui/book/info/BookInfoActivity.kt
index fb689519c..57839f1c9 100644
--- a/app/src/main/java/io/legado/app/ui/book/info/BookInfoActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/book/info/BookInfoActivity.kt
@@ -98,8 +98,8 @@ class BookInfoActivity :
         return super.onCompatOptionsItemSelected(item)
     }
 
-    override fun onMenuOpened(featureId: Int, menu: Menu?): Boolean {
-        menu?.findItem(R.id.menu_can_update)?.isChecked =
+    override fun onMenuOpened(featureId: Int, menu: Menu): Boolean {
+        menu.findItem(R.id.menu_can_update)?.isChecked =
             viewModel.bookData.value?.canUpdate ?: true
         return super.onMenuOpened(featureId, menu)
     }
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 247349a60..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
@@ -9,11 +9,11 @@ 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.lib.theme.ATH
 import io.legado.app.lib.theme.ThemeStore
 import io.legado.app.utils.getPrefBoolean
-import io.legado.app.utils.isTransparentStatusBar
 
 
 object Help {
@@ -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 19729f20b..12bbb6d8b 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
@@ -11,6 +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.AppConfig
 import io.legado.app.lib.theme.accentColor
 import io.legado.app.lib.theme.buttonDisabledColor
 import io.legado.app.service.help.ReadBook
@@ -41,7 +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)
@@ -144,7 +145,7 @@ class ReadMenu : FrameLayout {
 
         //夜间模式
         fabNightTheme.onClick {
-            context.putPrefBoolean("isNightTheme", !context.isNightTheme)
+            AppConfig.isNightTheme = !AppConfig.isNightTheme
             App.INSTANCE.applyDayNight()
         }
 
diff --git a/app/src/main/java/io/legado/app/ui/book/read/config/BgTextConfigDialog.kt b/app/src/main/java/io/legado/app/ui/book/read/config/BgTextConfigDialog.kt
index 2b4a7dc4f..460e234c0 100644
--- a/app/src/main/java/io/legado/app/ui/book/read/config/BgTextConfigDialog.kt
+++ b/app/src/main/java/io/legado/app/ui/book/read/config/BgTextConfigDialog.kt
@@ -21,7 +21,6 @@ import io.legado.app.R
 import io.legado.app.base.adapter.ItemViewHolder
 import io.legado.app.base.adapter.SimpleRecyclerAdapter
 import io.legado.app.constant.Bus
-import io.legado.app.help.FileHelp
 import io.legado.app.help.ImageLoader
 import io.legado.app.help.ReadBookConfig
 import io.legado.app.help.permission.Permissions
@@ -174,7 +173,7 @@ class BgTextConfigDialog : DialogFragment() {
                                 var file = requireContext().getExternalFilesDir(null)
                                     ?: requireContext().filesDir
                                 file =
-                                    FileHelp.getFile(file.absolutePath + File.separator + "bg" + File.separator + doc.name)
+                                    FileUtils.getFile(file.absolutePath + File.separator + "bg" + File.separator + doc.name)
                                 DocumentUtils.readBytes(requireContext(), uri)?.let {
                                     file.writeBytes(it)
                                     ReadBookConfig.getConfig().setBg(2, file.absolutePath)
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 ae44ddaad..fb250fb46 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
@@ -76,7 +76,7 @@ class SearchActivity : VMBaseActivity<SearchViewModel>(R.layout.activity_book_se
                     !getPrefBoolean(PreferKey.precisionSearch)
                 )
                 precisionSearchMenuItem?.isChecked = getPrefBoolean(PreferKey.precisionSearch)
-                search_view.query.toString().trim()?.let {
+                search_view.query?.toString()?.trim()?.let {
                     search_view.setQuery(it, true)
                 }
             }
@@ -88,7 +88,7 @@ class SearchActivity : VMBaseActivity<SearchViewModel>(R.layout.activity_book_se
                 } else {
                     putPrefString("searchGroup", item.title.toString())
                 }
-                search_view.query.toString().trim()?.let {
+                search_view.query?.toString()?.trim()?.let {
                     search_view.setQuery(it, true)
                 }
             }
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/book/source/manage/BookSourceViewModel.kt b/app/src/main/java/io/legado/app/ui/book/source/manage/BookSourceViewModel.kt
index 6ae3bd977..5c75187bd 100644
--- a/app/src/main/java/io/legado/app/ui/book/source/manage/BookSourceViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/book/source/manage/BookSourceViewModel.kt
@@ -7,7 +7,6 @@ import io.legado.app.App
 import io.legado.app.base.BaseViewModel
 import io.legado.app.data.api.IHttpGetApi
 import io.legado.app.data.entities.BookSource
-import io.legado.app.help.FileHelp
 import io.legado.app.help.http.HttpHelper
 import io.legado.app.help.storage.Backup
 import io.legado.app.help.storage.OldRule
@@ -92,7 +91,7 @@ class BookSourceViewModel(application: Application) : BaseViewModel(application)
             }.let {
                 val json = GSON.toJson(it)
                 val file =
-                    FileHelp.getFile(Backup.exportPath + File.separator + "exportBookSource.json")
+                    FileUtils.getFile(Backup.exportPath + File.separator + "exportBookSource.json")
                 file.writeText(json)
             }
         }.onSuccess {
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..7a0d7fb0f 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
@@ -1,6 +1,8 @@
 package io.legado.app.ui.config
 
+import android.app.Activity.RESULT_OK
 import android.content.ComponentName
+import android.content.Intent
 import android.content.SharedPreferences
 import android.content.pm.PackageManager
 import android.os.Bundle
@@ -12,8 +14,10 @@ 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.help.permission.Permissions
+import io.legado.app.help.permission.PermissionsCompat
 import io.legado.app.lib.theme.ATH
 import io.legado.app.receiver.SharedReceiverActivity
 import io.legado.app.ui.filechooser.FileChooserDialog
@@ -26,7 +30,7 @@ class OtherConfigFragment : PreferenceFragmentCompat(),
     Preference.OnPreferenceChangeListener,
     SharedPreferences.OnSharedPreferenceChangeListener {
 
-    private val downloadPath = 25324
+    private val requestCodeDownloadPath = 25324
     private val packageManager = App.INSTANCE.packageManager
     private val componentName = ComponentName(
         App.INSTANCE,
@@ -61,18 +65,13 @@ 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 =
                         getString(R.string.threads_num, it.toString())
                 }
-            PreferKey.downloadPath -> FileChooserDialog.show(
-                childFragmentManager,
-                downloadPath,
-                mode = FileChooserDialog.DIRECTORY,
-                initPath = getPreferenceString(PreferKey.downloadPath).toString()
-            )
+            PreferKey.downloadPath -> selectDownloadPathSys()
             PreferKey.cleanCache -> {
                 BookHelp.clearCache()
                 toast(R.string.clear_cache_success)
@@ -125,7 +124,7 @@ 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) ?: ""
         }
     }
@@ -148,7 +147,49 @@ class OtherConfigFragment : PreferenceFragmentCompat(),
         }
     }
 
+    private fun selectDownloadPathSys() {
+        try {
+            val intent = Intent(Intent.ACTION_OPEN_DOCUMENT_TREE)
+            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+            startActivityForResult(intent, requestCodeDownloadPath)
+        } catch (e: Exception) {
+            selectDownloadPath()
+        }
+    }
+
+    private fun selectDownloadPath() {
+        PermissionsCompat.Builder(this)
+            .addPermissions(*Permissions.Group.STORAGE)
+            .rationale(R.string.tip_perm_request_storage)
+            .onGranted {
+                FileChooserDialog.show(
+                    childFragmentManager,
+                    requestCodeDownloadPath,
+                    mode = FileChooserDialog.DIRECTORY,
+                    initPath = getPreferenceString(PreferKey.downloadPath).toString()
+                )
+            }
+            .request()
+    }
+
     override fun onFilePicked(requestCode: Int, currentPath: String) {
-        putPrefString(PreferKey.downloadPath, currentPath)
+        if (requestCode == requestCodeDownloadPath) {
+            putPrefString(PreferKey.downloadPath, currentPath)
+        }
+    }
+
+    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
+        super.onActivityResult(requestCode, resultCode, data)
+        when (requestCode) {
+            requestCodeDownloadPath -> if (resultCode == RESULT_OK) {
+                data?.data?.let { uri ->
+                    requireContext().contentResolver.takePersistableUriPermission(
+                        uri,
+                        Intent.FLAG_GRANT_READ_URI_PERMISSION or Intent.FLAG_GRANT_WRITE_URI_PERMISSION
+                    )
+                    putPrefString(PreferKey.downloadPath, uri.toString())
+                }
+            }
+        }
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/ui/config/ThemeConfigFragment.kt b/app/src/main/java/io/legado/app/ui/config/ThemeConfigFragment.kt
index 4dff95998..2ee2f6621 100644
--- a/app/src/main/java/io/legado/app/ui/config/ThemeConfigFragment.kt
+++ b/app/src/main/java/io/legado/app/ui/config/ThemeConfigFragment.kt
@@ -10,6 +10,7 @@ import androidx.preference.PreferenceFragmentCompat
 import io.legado.app.App
 import io.legado.app.R
 import io.legado.app.constant.Bus
+import io.legado.app.help.AppConfig
 import io.legado.app.lib.dialogs.alert
 import io.legado.app.lib.dialogs.noButton
 import io.legado.app.lib.dialogs.yesButton
@@ -20,7 +21,7 @@ import io.legado.app.utils.*
 
 class ThemeConfigFragment : PreferenceFragmentCompat(), SharedPreferences.OnSharedPreferenceChangeListener {
 
-    val items = arrayOf("极简","曜夜","经典","黑白","A屏黑")
+    val items = arrayOf("极简", "曜夜", "经典", "黑白", "A屏黑")
 
     override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
         addPreferencesFromResource(R.xml.pref_config_theme)
@@ -110,31 +111,37 @@ class ThemeConfigFragment : PreferenceFragmentCompat(), SharedPreferences.OnShar
                                     putPrefInt("colorPrimary", getCompatColor(R.color.md_grey_100))
                                     putPrefInt("colorAccent", getCompatColor(R.color.lightBlue_color))
                                     putPrefInt("colorBackground", getCompatColor(R.color.md_grey_100))
-                                    putPrefBoolean("isNightTheme", false)
+                                    AppConfig.isNightTheme = false
                                 }
                                 1 -> {
                                     putPrefInt("colorPrimaryNight", getCompatColor(R.color.shine_color))
                                     putPrefInt("colorAccentNight", getCompatColor(R.color.lightBlue_color))
                                     putPrefInt("colorBackgroundNight", getCompatColor(R.color.shine_color))
-                                    putPrefBoolean("isNightTheme", true)
+                                    AppConfig.isNightTheme = true
                                 }
                                 2 -> {
                                     putPrefInt("colorPrimary", getCompatColor(R.color.md_light_blue_500))
                                     putPrefInt("colorAccent", getCompatColor(R.color.md_pink_800))
                                     putPrefInt("colorBackground", getCompatColor(R.color.md_grey_100))
-                                    putPrefBoolean("isNightTheme", false)
+                                    AppConfig.isNightTheme = false
                                 }
                                 3 -> {
                                     putPrefInt("colorPrimary", getCompatColor(R.color.white))
                                     putPrefInt("colorAccent", getCompatColor(R.color.black))
                                     putPrefInt("colorBackground", getCompatColor(R.color.white))
-                                    putPrefBoolean("isNightTheme", false)
+                                    AppConfig.isNightTheme = false
                                 }
                                 4 -> {
                                     putPrefInt("colorPrimaryNight", getCompatColor(R.color.black))
-                                    putPrefInt("colorAccentNight", getCompatColor(R.color.md_grey_600))
-                                    putPrefInt("colorBackgroundNight", getCompatColor(R.color.black))
-                                    putPrefBoolean("isNightTheme", true)
+                                    putPrefInt(
+                                        "colorAccentNight",
+                                        getCompatColor(R.color.md_grey_600)
+                                    )
+                                    putPrefInt(
+                                        "colorBackgroundNight",
+                                        getCompatColor(R.color.black)
+                                    )
+                                    AppConfig.isNightTheme = true
                                 }
                             }
                             App.INSTANCE.applyDayNight()
@@ -166,7 +173,7 @@ class ThemeConfigFragment : PreferenceFragmentCompat(), SharedPreferences.OnShar
     }
 
     private fun upTheme(isNightTheme: Boolean) {
-        if (this.isNightTheme == isNightTheme) {
+        if (AppConfig.isNightTheme == isNightTheme) {
             App.INSTANCE.applyTheme()
             recreateActivities()
         }
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
         }
 
     }
diff --git a/app/src/main/java/io/legado/app/ui/main/my/MyFragment.kt b/app/src/main/java/io/legado/app/ui/main/my/MyFragment.kt
index 6d79f55d4..d3ee247c7 100644
--- a/app/src/main/java/io/legado/app/ui/main/my/MyFragment.kt
+++ b/app/src/main/java/io/legado/app/ui/main/my/MyFragment.kt
@@ -200,7 +200,7 @@ class MyFragment : BaseFragment(R.layout.fragment_my_config) {
 
         override fun onSharedPreferenceChanged(sharedPreferences: SharedPreferences?, key: String?) {
             when (key) {
-                "isNightTheme" -> App.INSTANCE.applyDayNight()
+                "themeMode" -> App.INSTANCE.applyDayNight()
                 "webService" -> {
                     if (requireContext().getPrefBoolean("webService")) {
                         WebService.start(requireContext())
diff --git a/app/src/main/java/io/legado/app/ui/replacerule/ReplaceRuleViewModel.kt b/app/src/main/java/io/legado/app/ui/replacerule/ReplaceRuleViewModel.kt
index ba6bc2a61..60be30fae 100644
--- a/app/src/main/java/io/legado/app/ui/replacerule/ReplaceRuleViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/replacerule/ReplaceRuleViewModel.kt
@@ -6,9 +6,9 @@ import io.legado.app.App
 import io.legado.app.R
 import io.legado.app.base.BaseViewModel
 import io.legado.app.data.entities.ReplaceRule
-import io.legado.app.help.FileHelp
 import io.legado.app.help.storage.Backup
 import io.legado.app.help.storage.Restore
+import io.legado.app.utils.FileUtils
 import io.legado.app.utils.GSON
 import io.legado.app.utils.splitNotBlank
 import org.jetbrains.anko.toast
@@ -80,7 +80,7 @@ class ReplaceRuleViewModel(application: Application) : BaseViewModel(application
             }.let {
                 val json = GSON.toJson(it)
                 val file =
-                    FileHelp.getFile(Backup.exportPath + File.separator + "exportReplaceRule.json")
+                    FileUtils.getFile(Backup.exportPath + File.separator + "exportReplaceRule.json")
                 file.writeText(json)
             }
         }.onSuccess {
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 a8ca32fdd..894bed7a9 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
@@ -149,7 +149,7 @@ class ReadRssActivity : VMBaseActivity<ReadRssViewModel>(R.layout.activity_rss_r
             webView.settings.javaScriptEnabled = true
             webView.evaluateJavascript("document.documentElement.outerHTML") {
                 val html = StringEscapeUtils.unescapeJson(it)
-                viewModel.readAloud(Jsoup.clean(html, Whitelist()))
+                viewModel.readAloud(Jsoup.clean(html, Whitelist.none()))
             }
         }
     }
diff --git a/app/src/main/java/io/legado/app/ui/rss/read/ReadRssViewModel.kt b/app/src/main/java/io/legado/app/ui/rss/read/ReadRssViewModel.kt
index 5af6841e9..36a487a6c 100644
--- a/app/src/main/java/io/legado/app/ui/rss/read/ReadRssViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/rss/read/ReadRssViewModel.kt
@@ -85,17 +85,12 @@ class ReadRssViewModel(application: Application) : BaseViewModel(application),
     }
 
     fun clHtml(content: String): String {
-        return if (content.contains("<style>|style=".toRegex())) {
-            content
-        } else {
-            """
-                <style>
-                    img{max-width:100% !important; width:auto; height:auto;}
-                    video{object-fit:fill; max-width:100% !important; width:auto; height:auto;}
+        return """<style>
+                    img{max-width:100%; width:auto; height:auto;}
+                    video{object-fit:fill; max-width:100%; width:auto; height:auto;}
                     body{word-wrap:break-word; height:auto;max-width: 100%; width:auto;}
-                </style>$content
-             """
-        }
+                </style>
+                $content"""
     }
 
     override fun onInit(status: Int) {
diff --git a/app/src/main/java/io/legado/app/ui/rss/source/manage/RssSourceViewModel.kt b/app/src/main/java/io/legado/app/ui/rss/source/manage/RssSourceViewModel.kt
index c47bb8c9d..22c8f62f4 100644
--- a/app/src/main/java/io/legado/app/ui/rss/source/manage/RssSourceViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/rss/source/manage/RssSourceViewModel.kt
@@ -4,10 +4,10 @@ import android.app.Application
 import android.text.TextUtils
 import com.jayway.jsonpath.JsonPath
 import io.legado.app.App
+import io.legado.app.R
 import io.legado.app.base.BaseViewModel
 import io.legado.app.data.api.IHttpGetApi
 import io.legado.app.data.entities.RssSource
-import io.legado.app.help.FileHelp
 import io.legado.app.help.http.HttpHelper
 import io.legado.app.help.storage.Backup
 import io.legado.app.help.storage.Restore.jsonPath
@@ -65,7 +65,7 @@ class RssSourceViewModel(application: Application) : BaseViewModel(application)
             App.db.rssSourceDao().getRssSources(*ids.toTypedArray()).let {
                 val json = GSON.toJson(it)
                 val file =
-                    FileHelp.getFile(Backup.exportPath + File.separator + "exportRssSource.json")
+                    FileUtils.getFile(Backup.exportPath + File.separator + "exportRssSource.json")
                 file.writeText(json)
             }
         }.onSuccess {
@@ -123,6 +123,8 @@ class RssSourceViewModel(application: Application) : BaseViewModel(application)
                     App.db.rssSourceDao().insert(*it.toTypedArray())
                 }
             }
+        }.onSuccess {
+            finally.invoke(context.getString(R.string.success))
         }
     }
 
diff --git a/app/src/main/java/io/legado/app/ui/widget/font/FontSelectDialog.kt b/app/src/main/java/io/legado/app/ui/widget/font/FontSelectDialog.kt
index 420bc9233..5e57e79fc 100644
--- a/app/src/main/java/io/legado/app/ui/widget/font/FontSelectDialog.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/font/FontSelectDialog.kt
@@ -5,7 +5,6 @@ import android.app.Activity.RESULT_OK
 import android.content.Intent
 import android.net.Uri
 import android.os.Bundle
-import android.os.Environment
 import android.util.DisplayMetrics
 import android.view.LayoutInflater
 import android.view.MenuItem
@@ -18,13 +17,9 @@ import androidx.recyclerview.widget.LinearLayoutManager
 import io.legado.app.App
 import io.legado.app.R
 import io.legado.app.constant.PreferKey
-import io.legado.app.help.FileHelp
 import io.legado.app.help.permission.Permissions
 import io.legado.app.help.permission.PermissionsCompat
-import io.legado.app.utils.DocumentUtils
-import io.legado.app.utils.getPrefString
-import io.legado.app.utils.putPrefString
-import io.legado.app.utils.toast
+import io.legado.app.utils.*
 import kotlinx.android.synthetic.main.dialog_font_select.*
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers.IO
@@ -127,11 +122,11 @@ class FontSelectDialog : DialogFragment(),
     @SuppressLint("DefaultLocale")
     private fun getFontFiles(uri: Uri) {
         launch(IO) {
-            FileHelp.deleteFile(fontCacheFolder)
+            FileUtils.deleteFile(fontCacheFolder)
             DocumentFile.fromTreeUri(App.INSTANCE, uri)?.listFiles()?.forEach { file ->
                 if (file.name?.toLowerCase()?.matches(".*\\.[ot]tf".toRegex()) == true) {
                     DocumentUtils.readBytes(App.INSTANCE, file.uri)?.let {
-                        FileHelp.getFile(fontCacheFolder + file.name).writeBytes(it)
+                        FileUtils.getFile(fontCacheFolder + file.name).writeBytes(it)
                     }
                 }
             }
@@ -154,7 +149,7 @@ class FontSelectDialog : DialogFragment(),
     private fun getFontFilesOld() {
         try {
             val file =
-                File(Environment.getExternalStorageDirectory().absolutePath + File.separator + "Fonts")
+                File(FileUtils.getSdCardPath() + File.separator + "Fonts")
             file.listFiles { pathName ->
                 pathName.name.toLowerCase().matches(".*\\.[ot]tf".toRegex())
             }?.let {
@@ -167,7 +162,7 @@ class FontSelectDialog : DialogFragment(),
 
     override fun onClick(file: File) {
         launch(IO) {
-            file.copyTo(FileHelp.getFile(fontFolder + file.name), true).absolutePath.let { path ->
+            file.copyTo(FileUtils.getFile(fontFolder + file.name), true).absolutePath.let { path ->
                 val cb = (parentFragment as? CallBack) ?: (activity as? CallBack)
                 cb?.let {
                     if (it.curFontPath != path) {
diff --git a/app/src/main/java/io/legado/app/utils/ACache.kt b/app/src/main/java/io/legado/app/utils/ACache.kt
index 44f96631c..03a330d6a 100644
--- a/app/src/main/java/io/legado/app/utils/ACache.kt
+++ b/app/src/main/java/io/legado/app/utils/ACache.kt
@@ -171,7 +171,7 @@ class ACache private constructor(cacheDir: File, max_size: Long, max_count: Int)
      * @return JSONObject数据
      */
     fun getAsJSONObject(key: String): JSONObject? {
-        val json = getAsString(key)
+        val json = getAsString(key) ?: return null
         return try {
             JSONObject(json)
         } catch (e: Exception) {
@@ -311,17 +311,17 @@ class ACache private constructor(cacheDir: File, max_size: Long, max_count: Int)
     fun getAsObject(key: String): Any? {
         val data = getAsBinary(key)
         if (data != null) {
-            var bais: ByteArrayInputStream? = null
+            var bis: ByteArrayInputStream? = null
             var ois: ObjectInputStream? = null
             try {
-                bais = ByteArrayInputStream(data)
-                ois = ObjectInputStream(bais)
+                bis = ByteArrayInputStream(data)
+                ois = ObjectInputStream(bis)
                 return ois.readObject()
             } catch (e: Exception) {
                 e.printStackTrace()
             } finally {
                 try {
-                    bais?.close()
+                    bis?.close()
                 } catch (e: IOException) {
                     e.printStackTrace()
                 }
@@ -597,6 +597,7 @@ class ACache private constructor(cacheDir: File, max_size: Long, max_count: Int)
             val w = drawable.intrinsicWidth
             val h = drawable.intrinsicHeight
             // 取 drawable 的颜色格式
+            @Suppress("DEPRECATION")
             val config = if (drawable.opacity != PixelFormat.OPAQUE)
                 Bitmap.Config.ARGB_8888
             else
diff --git a/app/src/main/java/io/legado/app/utils/ContextExtensions.kt b/app/src/main/java/io/legado/app/utils/ContextExtensions.kt
index e53b33e30..d5fc85fdf 100644
--- a/app/src/main/java/io/legado/app/utils/ContextExtensions.kt
+++ b/app/src/main/java/io/legado/app/utils/ContextExtensions.kt
@@ -4,6 +4,7 @@ import android.annotation.SuppressLint
 import android.content.Context
 import android.content.Intent
 import android.content.res.ColorStateList
+import android.content.res.Configuration
 import android.graphics.Bitmap
 import android.graphics.drawable.Drawable
 import android.provider.Settings
@@ -126,11 +127,7 @@ fun Context.shareWithQr(title: String, text: String) {
     }
 }
 
-val Context.isNightTheme: Boolean
-    get() = getPrefBoolean("isNightTheme")
-
-val Context.isEInkMode: Boolean
-    get() = getPrefBoolean("isEInkMode")
-
-val Context.isTransparentStatusBar: Boolean
-    get() = getPrefBoolean("transparentStatusBar", true)
+fun Context.sysIsDarkMode(): Boolean {
+    val mode = resources.configuration.uiMode and Configuration.UI_MODE_NIGHT_MASK
+    return mode == Configuration.UI_MODE_NIGHT_YES
+}
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/utils/DocumentUtils.kt b/app/src/main/java/io/legado/app/utils/DocumentUtils.kt
index 3929874ef..3d1f53a58 100644
--- a/app/src/main/java/io/legado/app/utils/DocumentUtils.kt
+++ b/app/src/main/java/io/legado/app/utils/DocumentUtils.kt
@@ -2,9 +2,44 @@ package io.legado.app.utils
 
 import android.content.Context
 import android.net.Uri
+import androidx.documentfile.provider.DocumentFile
 
 object DocumentUtils {
 
+    fun exists(root: DocumentFile, fileName: String, vararg subDirs: String): Boolean {
+        val parent = getDirDocument(root, *subDirs) ?: return false
+        return parent.findFile(fileName)?.exists() ?: false
+    }
+
+    fun createFileIfNotExist(
+        root: DocumentFile,
+        fileName: String,
+        mimeType: String = "",
+        vararg subDirs: String
+    ): DocumentFile? {
+        val parent: DocumentFile? = createFileIfNotExist(root, *subDirs)
+        return parent?.createFile(mimeType, fileName)
+    }
+
+    fun createFileIfNotExist(root: DocumentFile, vararg subDirs: String): DocumentFile? {
+        var parent: DocumentFile? = root
+        for (subDirName in subDirs) {
+            val subDir = parent?.findFile(subDirName)
+                ?: parent?.createDirectory(subDirName)
+            parent = subDir
+        }
+        return parent
+    }
+
+    fun getDirDocument(root: DocumentFile, vararg subDirs: String): DocumentFile? {
+        var parent = root
+        for (subDirName in subDirs) {
+            val subDir = parent.findFile(subDirName)
+            parent = subDir ?: return null
+        }
+        return parent
+    }
+
     @JvmStatic
     @Throws(Exception::class)
     fun writeText(context: Context, data: String, fileUri: Uri): Boolean {
diff --git a/app/src/main/java/io/legado/app/utils/FileUtils.kt b/app/src/main/java/io/legado/app/utils/FileUtils.kt
index 39148fe76..3d9923448 100644
--- a/app/src/main/java/io/legado/app/utils/FileUtils.kt
+++ b/app/src/main/java/io/legado/app/utils/FileUtils.kt
@@ -4,86 +4,92 @@ import android.content.ContentUris
 import android.content.Context
 import android.net.Uri
 import android.os.Environment
-import android.os.storage.StorageManager
 import android.provider.DocumentsContract
 import android.provider.MediaStore
-import android.util.Log
-import androidx.core.content.ContextCompat
+import io.legado.app.App
 import java.io.File
 import java.io.IOException
-import java.lang.reflect.Array
-import java.util.*
 
 
 object FileUtils {
 
-    fun getFileByPath(filePath: String): File? {
-        return if (filePath.isBlank()) null else File(filePath)
+    fun exists(file: File, fileName: String, vararg subDirs: String): Boolean {
+        val filePath =
+            file.absolutePath + File.separator + subDirs.joinToString(File.separator) + File.separator + fileName
+        return File(filePath).exists()
     }
 
-    fun getSdCardPath(): String {
-        var sdCardDirectory = Environment.getExternalStorageDirectory().absolutePath
-
-        try {
-            sdCardDirectory = File(sdCardDirectory).canonicalPath
-        } catch (ioe: IOException) {
-            ioe.printStackTrace()
-        }
+    fun createFileIfNotExist(file: File, fileName: String, vararg subDirs: String): File {
+        val filePath =
+            file.absolutePath + File.separator + subDirs.joinToString(File.separator) + File.separator + fileName
+        return getFile(filePath)
+    }
 
-        return sdCardDirectory
+    fun createFileIfNotExist(file: File, vararg subDirs: String): File {
+        val filePath = file.absolutePath + File.separator + subDirs.joinToString(File.separator)
+        return getFolder(filePath)
     }
 
-    fun getStorageData(pContext: Context): ArrayList<String>? {
+    fun getCachePath(): String {
+        return App.INSTANCE.externalCacheDir?.absolutePath
+            ?: App.INSTANCE.cacheDir.absolutePath
+    }
 
-        val storageManager = pContext.getSystemService(Context.STORAGE_SERVICE) as StorageManager
+    //获取文件夹
+    fun getFolder(filePath: String): File {
+        val file = File(filePath)
+        //如果文件夹不存在，就创建它
+        if (!file.exists()) {
+            file.mkdirs()
+        }
+        return file
+    }
 
+    //获取文件
+    @Synchronized
+    fun getFile(filePath: String): File {
+        val file = File(filePath)
         try {
-            val getVolumeList = storageManager.javaClass.getMethod("getVolumeList")
-
-            val storageVolumeClazz = Class.forName("android.os.storage.StorageVolume")
-            val getPath = storageVolumeClazz.getMethod("getPath")
-
-            val invokeVolumeList = getVolumeList.invoke(storageManager)
-            val length = Array.getLength(invokeVolumeList)
-
-            val list = ArrayList<String>()
-            for (i in 0 until length) {
-                val storageVolume = Array.get(invokeVolumeList, i)//得到StorageVolume对象
-                val path = getPath.invoke(storageVolume) as String
-
-                list.add(path)
+            if (!file.exists()) {
+                //创建父类文件夹
+                file.parent?.let {
+                    getFolder(it)
+                }
+                //创建文件
+                file.createNewFile()
             }
-            return list
-        } catch (e: Exception) {
+        } catch (e: IOException) {
             e.printStackTrace()
         }
-
-        return null
+        return file
     }
 
-
-    fun getExtSdCardPaths(con: Context): ArrayList<String> {
-        val paths = ArrayList<String>()
-        val files = ContextCompat.getExternalFilesDirs(con, "external")
-        val firstFile = files[0]
-        for (file in files) {
-            if (file != null && file != firstFile) {
-                val index = file.absolutePath.lastIndexOf("/Android/data")
-                if (index < 0) {
-                    Log.w("", "Unexpected external file dir: " + file.absolutePath)
-                } else {
-                    var path = file.absolutePath.substring(0, index)
-                    try {
-                        path = File(path).canonicalPath
-                    } catch (e: IOException) {
-                        // Keep non-canonical path.
-                    }
-
-                    paths.add(path)
-                }
+    //递归删除文件夹下的数据
+    @Synchronized
+    fun deleteFile(filePath: String) {
+        val file = File(filePath)
+        if (!file.exists()) return
+
+        if (file.isDirectory) {
+            val files = file.listFiles()
+            files?.forEach { subFile ->
+                val path = subFile.path
+                deleteFile(path)
             }
         }
-        return paths
+        //删除文件
+        file.delete()
+    }
+
+    fun getSdCardPath(): String {
+        @Suppress("DEPRECATION")
+        var sdCardDirectory = Environment.getExternalStorageDirectory().absolutePath
+        try {
+            sdCardDirectory = File(sdCardDirectory).canonicalPath
+        } catch (ioe: IOException) {
+            ioe.printStackTrace()
+        }
+        return sdCardDirectory
     }
 
     fun getPath(context: Context, uri: Uri): String? {
@@ -96,6 +102,7 @@ object FileUtils {
                 val type = split[0]
 
                 if ("primary".equals(type, ignoreCase = true)) {
+                    @Suppress("DEPRECATION")
                     return Environment.getExternalStorageDirectory().toString() + "/" + split[1]
                 }
 
@@ -145,7 +152,7 @@ object FileUtils {
 
     private fun getDataColumn(
         context: Context, uri: Uri, selection: String?,
-        selectionArgs: kotlin.Array<String>?
+        selectionArgs: Array<String>?
     ): String? {
 
         val column = "_data"
diff --git a/app/src/main/java/io/legado/app/utils/FragmentExtensions.kt b/app/src/main/java/io/legado/app/utils/FragmentExtensions.kt
index f233929fb..b2379e89a 100644
--- a/app/src/main/java/io/legado/app/utils/FragmentExtensions.kt
+++ b/app/src/main/java/io/legado/app/utils/FragmentExtensions.kt
@@ -54,17 +54,9 @@ fun Fragment.getCompatDrawable(@DrawableRes id: Int): Drawable? = requireContext
 
 fun Fragment.getCompatColorStateList(@ColorRes id: Int): ColorStateList? = requireContext().getCompatColorStateList(id)
 
-val Fragment.isNightTheme: Boolean
-    get() = getPrefBoolean("isNightTheme")
-
-val Fragment.isTransparentStatusBar: Boolean
-    get() = getPrefBoolean("transparentStatusBar")
-
-
 inline fun <reified T : Activity> Fragment.startActivity(vararg params: Pair<String, Any?>) =
     AnkoInternals.internalStartActivity(requireActivity(), T::class.java, params)
 
-
 inline fun <reified T : Activity> Fragment.startActivityForResult(requestCode: Int, vararg params: Pair<String, Any?>) =
     startActivityForResult(AnkoInternals.createIntent(requireActivity(), T::class.java, params), requestCode)
 
diff --git a/app/src/main/java/io/legado/app/utils/LogUtils.kt b/app/src/main/java/io/legado/app/utils/LogUtils.kt
index 1662974a7..b6712ad4d 100644
--- a/app/src/main/java/io/legado/app/utils/LogUtils.kt
+++ b/app/src/main/java/io/legado/app/utils/LogUtils.kt
@@ -2,7 +2,6 @@ package io.legado.app.utils
 
 import android.annotation.SuppressLint
 import io.legado.app.App
-import io.legado.app.help.FileHelp
 import java.io.File
 import java.text.SimpleDateFormat
 import java.util.*
@@ -30,8 +29,8 @@ object LogUtils {
     }
 
     private val fileHandler by lazy {
-        val logFolder = FileHelp.getCachePath() + File.separator + "logs"
-        FileHelp.getFolder(logFolder)
+        val logFolder = FileUtils.getCachePath() + File.separator + "logs"
+        FileUtils.getFolder(logFolder)
         FileHandler(
             logFolder + File.separator + "app.log",
             10240,
diff --git a/app/src/main/java/io/legado/app/utils/StringExtensions.kt b/app/src/main/java/io/legado/app/utils/StringExtensions.kt
index 987a0fce8..19319d3ba 100644
--- a/app/src/main/java/io/legado/app/utils/StringExtensions.kt
+++ b/app/src/main/java/io/legado/app/utils/StringExtensions.kt
@@ -4,34 +4,41 @@ package io.legado.app.utils
 
 fun String?.safeTrim() = if (this.isNullOrBlank()) null else this.trim()
 
-fun String?.isAbsUrl() = if (this.isNullOrBlank()) false else this.startsWith("http://", true)
-        || this.startsWith("https://", true)
-
-fun String?.isJson(): Boolean = this?.run {
-    val str = this.trim()
-    when {
-        str.startsWith("{") && str.endsWith("}") -> true
-        str.startsWith("[") && str.endsWith("]") -> true
-        else -> false
-    }
-} ?: false
-
-fun String?.isJsonObject(): Boolean = this?.run {
-    val str = this.trim()
-    str.startsWith("{") && str.endsWith("}")
-} ?: false
-
-fun String?.isJsonArray(): Boolean = this?.run {
-    val str = this.trim()
-    str.startsWith("[") && str.endsWith("]")
-} ?: false
-
-fun String?.htmlFormat(): String = if (this.isNullOrBlank()) "" else
-    this.replace("(?i)<(br[\\s/]*|/*p\\b.*?|/*div\\b.*?)>".toRegex(), "\n")// 替换特定标签为换行符
-        .replace("<[script>]*.*?>|&nbsp;".toRegex(), "")// 删除script标签对和空格转义符
-        .replace("\\s*\\n+\\s*".toRegex(), "\n　　")// 移除空行,并增加段前缩进2个汉字
-        .replace("^[\\n\\s]+".toRegex(), "　　")//移除开头空行,并增加段前缩进2个汉字
-        .replace("[\\n\\s]+$".toRegex(), "") //移除尾部空行
+fun String?.isAbsUrl() =
+    this?.let {
+        it.startsWith("http://", true)
+                || it.startsWith("https://", true)
+    } ?: false
+
+fun String?.isJson(): Boolean =
+    this?.run {
+        val str = this.trim()
+        when {
+            str.startsWith("{") && str.endsWith("}") -> true
+            str.startsWith("[") && str.endsWith("]") -> true
+            else -> false
+        }
+    } ?: false
+
+fun String?.isJsonObject(): Boolean =
+    this?.run {
+        val str = this.trim()
+        str.startsWith("{") && str.endsWith("}")
+    } ?: false
+
+fun String?.isJsonArray(): Boolean =
+    this?.run {
+        val str = this.trim()
+        str.startsWith("[") && str.endsWith("]")
+    } ?: false
+
+fun String?.htmlFormat(): String =
+    this?.replace("(?i)<(br[\\s/]*|/*p\\b.*?|/*div\\b.*?)>".toRegex(), "\n")
+        ?.replace("<[script>]*.*?>|&nbsp;".toRegex(), "")
+        ?.replace("\\s*\\n+\\s*".toRegex(), "\n　　")
+        ?.replace("^[\\n\\s]+".toRegex(), "　　")
+        ?.replace("[\\n\\s]+$".toRegex(), "")
+        ?: ""
 
 fun String.splitNotBlank(vararg delimiter: String): Array<String> = run {
     this.split(*delimiter).map { it.trim() }.filterNot { it.isBlank() }.toTypedArray()
diff --git a/app/src/main/java/io/legado/app/utils/StringUtils.kt b/app/src/main/java/io/legado/app/utils/StringUtils.kt
index c9f80866f..95096c087 100644
--- a/app/src/main/java/io/legado/app/utils/StringUtils.kt
+++ b/app/src/main/java/io/legado/app/utils/StringUtils.kt
@@ -41,16 +41,18 @@ object StringUtils {
     //将时间转换成日期
     fun dateConvert(time: Long, pattern: String): String {
         val date = Date(time)
-        @SuppressLint("SimpleDateFormat") val format = SimpleDateFormat(pattern)
+        @SuppressLint("SimpleDateFormat")
+        val format = SimpleDateFormat(pattern)
         return format.format(date)
     }
 
     //将日期转换成昨天、今天、明天
     fun dateConvert(source: String, pattern: String): String {
-        @SuppressLint("SimpleDateFormat") val format = SimpleDateFormat(pattern)
+        @SuppressLint("SimpleDateFormat")
+        val format = SimpleDateFormat(pattern)
         val calendar = Calendar.getInstance()
         try {
-            val date = format.parse(source)
+            val date = format.parse(source) ?: return ""
             val curTime = calendar.timeInMillis
             calendar.time = date
             //将MISC 转换成 sec
@@ -62,13 +64,18 @@ object StringUtils {
             //如果没有时间
             if (oldHour == 0) {
                 //比日期:昨天今天和明天
-                if (difDate == 0L) {
-                    return "今天"
-                } else if (difDate < DAY_OF_YESTERDAY) {
-                    return "昨天"
-                } else {
-                    @SuppressLint("SimpleDateFormat") val convertFormat = SimpleDateFormat("yyyy-MM-dd")
-                    return convertFormat.format(date)
+                return when {
+                    difDate == 0L -> {
+                        "今天"
+                    }
+                    difDate < DAY_OF_YESTERDAY -> {
+                        "昨天"
+                    }
+                    else -> {
+                        @SuppressLint("SimpleDateFormat")
+                        val convertFormat = SimpleDateFormat("yyyy-MM-dd")
+                        convertFormat.format(date)
+                    }
                 }
             }
 
@@ -78,7 +85,8 @@ object StringUtils {
                 difHour < HOUR_OF_DAY -> difHour.toString() + "小时前"
                 difDate < DAY_OF_YESTERDAY -> "昨天"
                 else -> {
-                    @SuppressLint("SimpleDateFormat") val convertFormat = SimpleDateFormat("yyyy-MM-dd")
+                    @SuppressLint("SimpleDateFormat")
+                    val convertFormat = SimpleDateFormat("yyyy-MM-dd")
                     convertFormat.format(date)
                 }
             }
@@ -242,7 +250,7 @@ object StringUtils {
         val m = p.matcher(data)
         val buf = StringBuffer(data.length)
         while (m.find()) {
-            val ch = Integer.parseInt(m.group(1), 16).toChar().toString()
+            val ch = Integer.parseInt(m.group(1)!!, 16).toChar().toString()
             m.appendReplacement(buf, Matcher.quoteReplacement(ch))
         }
         m.appendTail(buf)
@@ -254,9 +262,9 @@ object StringUtils {
             "(?i)<(br[\\s/]*|/*p.*?|/*div.*?)>".toRegex(),
             "\n"
         )// 替换特定标签为换行符
-                .replace("<[script>]*.*?>|&nbsp;".toRegex(), "")// 删除script标签对和空格转义符
-                .replace("\\s*\\n+\\s*".toRegex(), "\n　　")// 移除空行,并增加段前缩进2个汉字
-                .replace("^[\\n\\s]+".toRegex(), "　　")//移除开头空行,并增加段前缩进2个汉字
-                .replace("[\\n\\s]+$".toRegex(), "") //移除尾部空行
+            .replace("<[script>]*.*?>|&nbsp;".toRegex(), "")// 删除script标签对和空格转义符
+            .replace("\\s*\\n+\\s*".toRegex(), "\n　　")// 移除空行,并增加段前缩进2个汉字
+            .replace("^[\\n\\s]+".toRegex(), "　　")//移除开头空行,并增加段前缩进2个汉字
+            .replace("[\\n\\s]+$".toRegex(), "") //移除尾部空行
     }
 }
diff --git a/app/src/main/java/io/legado/app/utils/UriExtensions.kt b/app/src/main/java/io/legado/app/utils/UriExtensions.kt
index 297a5a612..49b76b439 100644
--- a/app/src/main/java/io/legado/app/utils/UriExtensions.kt
+++ b/app/src/main/java/io/legado/app/utils/UriExtensions.kt
@@ -5,6 +5,9 @@ import android.net.Uri
 import androidx.documentfile.provider.DocumentFile
 import java.io.File
 
+fun Uri.isDocumentUri(context: Context): Boolean {
+    return DocumentFile.isDocumentUri(context, this)
+}
 
 @Throws(Exception::class)
 fun Uri.readBytes(context: Context): ByteArray? {
diff --git a/app/src/main/java/io/legado/app/utils/ViewExtensions.kt b/app/src/main/java/io/legado/app/utils/ViewExtensions.kt
index 81cdafe81..403f0d40c 100644
--- a/app/src/main/java/io/legado/app/utils/ViewExtensions.kt
+++ b/app/src/main/java/io/legado/app/utils/ViewExtensions.kt
@@ -24,7 +24,7 @@ private tailrec fun getCompatActivity(context: Context?): AppCompatActivity? {
 val View.activity: AppCompatActivity?
     get() = getCompatActivity(context)
 
-inline fun View.hideSoftInput() = run {
+fun View.hideSoftInput() = run {
     val imm = App.INSTANCE.getSystemService(Context.INPUT_METHOD_SERVICE) as? InputMethodManager
     imm?.let {
         imm.hideSoftInputFromWindow(this.windowToken, 0)
diff --git a/app/src/main/java/io/legado/app/utils/ZipUtils.kt b/app/src/main/java/io/legado/app/utils/ZipUtils.kt
index eab9951c7..44d547e5c 100644
--- a/app/src/main/java/io/legado/app/utils/ZipUtils.kt
+++ b/app/src/main/java/io/legado/app/utils/ZipUtils.kt
@@ -57,7 +57,7 @@ object ZipUtils {
             }
             return true
         } finally {
-            if (zos != null) {
+            zos?.let {
                 zos.finish()
                 zos.close()
             }
@@ -89,7 +89,7 @@ object ZipUtils {
             }
             return true
         } finally {
-            if (zos != null) {
+            zos?.let {
                 zos.finish()
                 zos.close()
             }
@@ -261,7 +261,7 @@ object ZipUtils {
         val files = ArrayList<File>()
         val zip = ZipFile(zipFile)
         val entries = zip.entries()
-        try {
+        zip.use {
             if (isSpace(keyword)) {
                 while (entries.hasMoreElements()) {
                     val entry = entries.nextElement() as ZipEntry
@@ -285,8 +285,6 @@ object ZipUtils {
                     }
                 }
             }
-        } finally {
-            zip.close()
         }
         return files
     }
diff --git a/app/src/main/res/values/arrays.xml b/app/src/main/res/values/arrays.xml
index 67bb70836..b8cea9e3b 100644
--- a/app/src/main/res/values/arrays.xml
+++ b/app/src/main/res/values/arrays.xml
@@ -63,6 +63,18 @@
         <item>@string/jf_convert_f</item>
     </string-array>
 
+    <string-array name="theme_mode">
+        <item>跟随系统</item>
+        <item>亮色主题</item>
+        <item>暗色主题</item>
+    </string-array>
+
+    <string-array name="theme_mode_v">
+        <item>0</item>
+        <item>1</item>
+        <item>2</item>
+    </string-array>
+
     <string-array name="NavBarColors">
         <item>自动</item>
         <item>黑色</item>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index d481ccdff..43a0e6019 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -433,6 +433,7 @@
     <string name="scan_qr_code">扫描二维码</string>
     <string name="click_on_selected_show_menu">选中时点击可弹出菜单</string>
     <string name="theme">主题</string>
+    <string name="theme_mode">主题模式</string>
     <string name="default_theme">默认主题</string>
     <string name="restore_default_theme">恢复主题为默认配色</string>
     <string name="join_qq_group">加入QQ群</string>
@@ -583,5 +584,7 @@
     <string name="text_too_long_qr_error">文字太多,生成二维码失败</string>
     <string name="share_rss_source">分享RSS源</string>
     <string name="share_book_source">分享书源</string>
+    <string name="auto_dark_mode">自动切换夜间模式</string>
+    <string name="auto_dark_mode_s">夜间模式跟随系统</string>
 
 </resources>
diff --git a/app/src/main/res/xml/pref_config_theme.xml b/app/src/main/res/xml/pref_config_theme.xml
index f9f3df963..4988e08bf 100644
--- a/app/src/main/res/xml/pref_config_theme.xml
+++ b/app/src/main/res/xml/pref_config_theme.xml
@@ -2,7 +2,6 @@
 <androidx.preference.PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto">
 
-
     <io.legado.app.lib.theme.prefs.ATESwitchPreference
         android:defaultValue="true"
         android:key="transparentStatusBar"
diff --git a/app/src/main/res/xml/pref_main.xml b/app/src/main/res/xml/pref_main.xml
index f59dff9f7..ea32b2865 100644
--- a/app/src/main/res/xml/pref_main.xml
+++ b/app/src/main/res/xml/pref_main.xml
@@ -12,10 +12,18 @@
         android:title="@string/replace_purify"
         app:iconSpaceReserved="false" />
 
+    <io.legado.app.lib.theme.prefs.ATEListPreference
+        android:defaultValue="0"
+        android:entries="@array/theme_mode"
+        android:entryValues="@array/theme_mode_v"
+        android:key="themeMode"
+        android:title="@string/theme_mode"
+        app:iconSpaceReserved="false" />
+
     <io.legado.app.lib.theme.prefs.ATESwitchPreference
         android:defaultValue="false"
-        android:key="isNightTheme"
-        android:title="@string/night_theme"
+        android:key="isEInkMode"
+        android:title="@string/eink_theme"
         app:iconSpaceReserved="false" />
 
     <io.legado.app.lib.theme.prefs.ATESwitchPreference