diff --git a/app/src/main/java/io/legado/app/ui/book/local/ImportBookActivity.kt b/app/src/main/java/io/legado/app/ui/book/local/ImportBookActivity.kt
index f706a0c56..df335d8ca 100644
--- a/app/src/main/java/io/legado/app/ui/book/local/ImportBookActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/book/local/ImportBookActivity.kt
@@ -4,7 +4,6 @@ import android.annotation.SuppressLint
 import android.net.Uri
 import android.os.Build
 import android.os.Bundle
-import android.provider.DocumentsContract
 import android.view.Menu
 import android.view.MenuItem
 import androidx.activity.viewModels
@@ -31,7 +30,6 @@ import kotlinx.coroutines.flow.collect
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import java.io.File
-import java.util.*
 
 /**
  * 导入本地书籍界面
@@ -43,7 +41,7 @@ class ImportBookActivity : VMBaseActivity<ActivityImportBookBinding, ImportBookV
 
     override val binding by viewBinding(ActivityImportBookBinding::inflate)
     override val viewModel by viewModels<ImportBookViewModel>()
-
+    private val bookFileRegex = Regex("(?i).*\\.(txt|epub|umd)")
     private var rootDoc: DocumentFile? = null
     private val subDocs = arrayListOf<DocumentFile>()
     private val adapter by lazy { ImportBookAdapter(this, this) }
@@ -191,17 +189,11 @@ class ImportBookActivity : VMBaseActivity<ActivityImportBookBinding, ImportBookV
         adapter.clearItems()
         launch(IO) {
             runCatching {
-                val docList = DocumentUtils.listFiles(lastDoc.uri)
-                for (i in docList.lastIndex downTo 0) {
-                    val item = docList[i]
-                    if (item.name.startsWith(".")) {
-                        docList.removeAt(i)
-                    } else if (!item.isDir
-                        && !item.name.endsWith(".txt", true)
-                        && !item.name.endsWith(".epub", true)
-                        && !item.name.endsWith(".umd", true)
-                    ) {
-                        docList.removeAt(i)
+                val docList = DocumentUtils.listFiles(lastDoc.uri) { item ->
+                    when {
+                        item.name.startsWith(".") -> false
+                        item.isDir -> true
+                        else -> item.name.matches(bookFileRegex)
                     }
                 }
                 docList.sortWith(compareBy({ !it.isDir }, { it.name }))
@@ -217,36 +209,24 @@ class ImportBookActivity : VMBaseActivity<ActivityImportBookBinding, ImportBookV
     private fun upFiles() {
         binding.tvEmptyMsg.gone()
         binding.tvPath.text = path.replace(sdPath, "SD")
-        val docList = arrayListOf<DocItem>()
-        File(path).listFiles()?.forEach {
-            if (it.isDirectory) {
-                if (!it.name.startsWith("."))
-                    docList.add(
-                        DocItem(
-                            it.name,
-                            DocumentsContract.Document.MIME_TYPE_DIR,
-                            it.length(),
-                            Date(it.lastModified()),
-                            Uri.fromFile(it)
-                        )
-                    )
-            } else if (it.name.endsWith(".txt", true)
-                || it.name.endsWith(".epub", true)
-                || it.name.endsWith(".umd", true)
-            ) {
-                docList.add(
-                    DocItem(
-                        it.name,
-                        it.extension,
-                        it.length(),
-                        Date(it.lastModified()),
-                        Uri.fromFile(it)
-                    )
-                )
+        adapter.clearItems()
+        launch(IO) {
+            kotlin.runCatching {
+                val docList = DocumentUtils.listFiles(path) {
+                    when {
+                        it.name.startsWith(".") -> false
+                        it.isDirectory -> true
+                        else -> it.name.matches(bookFileRegex)
+                    }
+                }
+                docList.sortWith(compareBy({ !it.isDir }, { it.name }))
+                withContext(Main) {
+                    adapter.setItems(docList)
+                }
+            }.onFailure {
+                toastOnUi("获取文件列表出错\n${it.localizedMessage}")
             }
         }
-        docList.sortWith(compareBy({ !it.isDir }, { it.name }))
-        adapter.setItems(docList)
     }
 
     /**
@@ -298,7 +278,7 @@ class ImportBookActivity : VMBaseActivity<ActivityImportBookBinding, ImportBookV
         }
     }
 
-    private val find: (docItem: DocItem) -> Unit = {
+    private val find: (docItem: FileDoc) -> Unit = {
         launch {
             adapter.addItem(it)
         }
diff --git a/app/src/main/java/io/legado/app/ui/book/local/ImportBookAdapter.kt b/app/src/main/java/io/legado/app/ui/book/local/ImportBookAdapter.kt
index 75364291d..8180f1e7c 100644
--- a/app/src/main/java/io/legado/app/ui/book/local/ImportBookAdapter.kt
+++ b/app/src/main/java/io/legado/app/ui/book/local/ImportBookAdapter.kt
@@ -13,7 +13,7 @@ import io.legado.app.utils.*
 
 
 class ImportBookAdapter(context: Context, val callBack: CallBack) :
-    RecyclerAdapter<DocItem, ItemImportBookBinding>(context) {
+    RecyclerAdapter<FileDoc, ItemImportBookBinding>(context) {
     var selectedUris = hashSetOf<String>()
     var checkableCount = 0
     private var bookFileNames = arrayListOf<String>()
@@ -29,7 +29,7 @@ class ImportBookAdapter(context: Context, val callBack: CallBack) :
     override fun convert(
         holder: ItemViewHolder,
         binding: ItemImportBookBinding,
-        item: DocItem,
+        item: FileDoc,
         payloads: MutableList<Any>
     ) {
         binding.run {
diff --git a/app/src/main/java/io/legado/app/ui/book/local/ImportBookViewModel.kt b/app/src/main/java/io/legado/app/ui/book/local/ImportBookViewModel.kt
index 209e3bf3b..e5ffa13da 100644
--- a/app/src/main/java/io/legado/app/ui/book/local/ImportBookViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/book/local/ImportBookViewModel.kt
@@ -5,8 +5,8 @@ import android.net.Uri
 import androidx.documentfile.provider.DocumentFile
 import io.legado.app.base.BaseViewModel
 import io.legado.app.model.localBook.LocalBook
-import io.legado.app.utils.DocItem
 import io.legado.app.utils.DocumentUtils
+import io.legado.app.utils.FileDoc
 import io.legado.app.utils.isContentScheme
 import io.legado.app.utils.toastOnUi
 import java.io.File
@@ -45,12 +45,11 @@ class ImportBookViewModel(application: Application) : BaseViewModel(application)
     fun scanDoc(
         documentFile: DocumentFile,
         isRoot: Boolean,
-        find: (docItem: DocItem) -> Unit,
+        find: (docItem: FileDoc) -> Unit,
         finally: (() -> Unit)? = null
     ) {
         kotlin.runCatching {
-            val docList = DocumentUtils.listFiles(documentFile.uri)
-            docList.forEach { docItem ->
+            DocumentUtils.listFiles(documentFile.uri).forEach { docItem ->
                 if (docItem.isDir) {
                     DocumentFile.fromSingleUri(context, docItem.uri)?.let {
                         scanDoc(it, false, find)
@@ -72,7 +71,7 @@ class ImportBookViewModel(application: Application) : BaseViewModel(application)
     fun scanFile(
         file: File,
         isRoot: Boolean,
-        find: (docItem: DocItem) -> Unit,
+        find: (docItem: FileDoc) -> Unit,
         finally: (() -> Unit)? = null
     ) {
         file.listFiles()?.forEach {
@@ -82,9 +81,9 @@ class ImportBookViewModel(application: Application) : BaseViewModel(application)
                 || it.name.endsWith(".epub", true)
             ) {
                 find(
-                    DocItem(
+                    FileDoc(
                         it.name,
-                        it.extension,
+                        it.isDirectory,
                         it.length(),
                         Date(it.lastModified()),
                         Uri.parse(it.absolutePath)
diff --git a/app/src/main/java/io/legado/app/ui/widget/font/FontAdapter.kt b/app/src/main/java/io/legado/app/ui/widget/font/FontAdapter.kt
index ad526c69e..8f4777220 100644
--- a/app/src/main/java/io/legado/app/ui/widget/font/FontAdapter.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/font/FontAdapter.kt
@@ -13,7 +13,7 @@ import java.io.File
 import java.net.URLDecoder
 
 class FontAdapter(context: Context, curFilePath: String, val callBack: CallBack) :
-    RecyclerAdapter<DocItem, ItemFontBinding>(context) {
+    RecyclerAdapter<FileDoc, ItemFontBinding>(context) {
 
     private val curName = URLDecoder.decode(curFilePath, "utf-8")
         .substringAfterLast(File.separator)
@@ -25,12 +25,12 @@ class FontAdapter(context: Context, curFilePath: String, val callBack: CallBack)
     override fun convert(
         holder: ItemViewHolder,
         binding: ItemFontBinding,
-        item: DocItem,
+        item: FileDoc,
         payloads: MutableList<Any>
     ) {
         binding.run {
             kotlin.runCatching {
-                val typeface: Typeface? = if (item.isContentPath) {
+                val typeface: Typeface? = if (item.isContentScheme) {
                     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                         context.contentResolver
                             .openFileDescriptor(item.uri, "r")
@@ -67,6 +67,6 @@ class FontAdapter(context: Context, curFilePath: String, val callBack: CallBack)
     }
 
     interface CallBack {
-        fun onClick(docItem: DocItem)
+        fun onClick(docItem: FileDoc)
     }
 }
\ No newline at end of file
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 0db688205..3a1002d8b 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
@@ -126,29 +126,18 @@ class FontSelectDialog : BaseDialogFragment(R.layout.dialog_font_select),
         }
     }
 
-    private fun getLocalFonts(): ArrayList<DocItem> {
-        val fontItems = arrayListOf<DocItem>()
-        val fontDir =
-            FileUtils.createFolderIfNotExist(requireContext().externalFiles, "font")
-        fontDir.listFiles { pathName ->
-            pathName.name.lowercase(Locale.getDefault()).matches(fontRegex)
-        }?.forEach {
-            fontItems.add(
-                DocItem(
-                    it.name,
-                    it.extension,
-                    it.length(),
-                    Date(it.lastModified()),
-                    Uri.parse(it.absolutePath)
-                )
-            )
+    private fun getLocalFonts(): ArrayList<FileDoc> {
+        val path = FileUtils.getPath(requireContext().externalFiles, "font")
+        return DocumentUtils.listFiles(path) {
+            it.name.matches(fontRegex)
         }
-        return fontItems
     }
 
     private fun loadFontFiles(doc: DocumentFile) {
         execute {
-            val fontItems = DocumentUtils.listFiles(doc.uri, fontRegex)
+            val fontItems = DocumentUtils.listFiles(doc.uri) {
+                it.name.matches(fontRegex)
+            }
             mergeFontItems(fontItems, getLocalFonts())
         }.onSuccess {
             adapter.setItems(it)
@@ -169,7 +158,9 @@ class FontSelectDialog : BaseDialogFragment(R.layout.dialog_font_select),
 
     private fun loadFontFiles(path: String) {
         execute {
-            val fontItems = DocumentUtils.listFiles(path, fontRegex)
+            val fontItems = DocumentUtils.listFiles(path) {
+                it.name.matches(fontRegex)
+            }
             mergeFontItems(fontItems, getLocalFonts())
         }.onSuccess {
             adapter.setItems(it)
@@ -179,9 +170,9 @@ class FontSelectDialog : BaseDialogFragment(R.layout.dialog_font_select),
     }
 
     private fun mergeFontItems(
-        items1: ArrayList<DocItem>,
-        items2: ArrayList<DocItem>
-    ): List<DocItem> {
+        items1: ArrayList<FileDoc>,
+        items2: ArrayList<FileDoc>
+    ): List<FileDoc> {
         val items = ArrayList(items1)
         items2.forEach { item2 ->
             var isInFirst = false
@@ -200,7 +191,7 @@ class FontSelectDialog : BaseDialogFragment(R.layout.dialog_font_select),
         }
     }
 
-    override fun onClick(docItem: DocItem) {
+    override fun onClick(docItem: FileDoc) {
         execute {
             FileUtils.deleteFile(fontFolder.absolutePath)
             callBack?.selectFont(docItem.uri.toString())
diff --git a/app/src/main/java/io/legado/app/utils/DocumentExtensions.kt b/app/src/main/java/io/legado/app/utils/DocumentExtensions.kt
index 1d77b2655..15c2e6336 100644
--- a/app/src/main/java/io/legado/app/utils/DocumentExtensions.kt
+++ b/app/src/main/java/io/legado/app/utils/DocumentExtensions.kt
@@ -95,8 +95,8 @@ object DocumentUtils {
     }
 
     @Throws(Exception::class)
-    fun listFiles(uri: Uri, regex: Regex? = null): ArrayList<DocItem> {
-        val docList = arrayListOf<DocItem>()
+    fun listFiles(uri: Uri, filter: ((file: FileDoc) -> Boolean)? = null): ArrayList<FileDoc> {
+        val docList = arrayListOf<FileDoc>()
         var cursor: Cursor? = null
         try {
             val childrenUri = DocumentsContract
@@ -118,16 +118,15 @@ object DocumentUtils {
                 val dci = cursor.getColumnIndex(DocumentsContract.Document.COLUMN_LAST_MODIFIED)
                 if (cursor.moveToFirst()) {
                     do {
-                        val name = cursor.getString(nci)
-                        if (regex == null || regex.matches(name)) {
-                            val item = DocItem(
-                                name = name,
-                                attr = cursor.getString(mci),
-                                size = cursor.getLong(sci),
-                                date = Date(cursor.getLong(dci)),
-                                uri = DocumentsContract
-                                    .buildDocumentUriUsingTree(uri, cursor.getString(ici))
-                            )
+                        val item = FileDoc(
+                            name = cursor.getString(nci),
+                            isDir = cursor.getString(mci) == DocumentsContract.Document.MIME_TYPE_DIR,
+                            size = cursor.getLong(sci),
+                            date = Date(cursor.getLong(dci)),
+                            uri = DocumentsContract
+                                .buildDocumentUriUsingTree(uri, cursor.getString(ici))
+                        )
+                        if (filter == null || filter.invoke(item)) {
                             docList.add(item)
                         }
                     } while (cursor.moveToNext())
@@ -140,18 +139,16 @@ object DocumentUtils {
     }
 
     @Throws(Exception::class)
-    fun listFiles(path: String, regex: Regex? = null): ArrayList<DocItem> {
-        val docItems = arrayListOf<DocItem>()
+    fun listFiles(path: String, filter: ((file: File) -> Boolean)? = null): ArrayList<FileDoc> {
+        val docItems = arrayListOf<FileDoc>()
         val file = File(path)
         file.listFiles { pathName ->
-            regex?.let {
-                pathName.name.matches(it)
-            } ?: true
+            filter?.invoke(pathName) ?: true
         }?.forEach {
             docItems.add(
-                DocItem(
+                FileDoc(
                     it.name,
-                    it.extension,
+                    it.isDirectory,
                     it.length(),
                     Date(it.lastModified()),
                     Uri.parse(it.absolutePath)
@@ -163,18 +160,14 @@ object DocumentUtils {
 
 }
 
-data class DocItem(
+data class FileDoc(
     val name: String,
-    val attr: String,
+    val isDir: Boolean,
     val size: Long,
     val date: Date,
     val uri: Uri
 ) {
-    val isDir: Boolean by lazy {
-        DocumentsContract.Document.MIME_TYPE_DIR == attr
-    }
-
-    val isContentPath get() = uri.isContentScheme()
+    val isContentScheme get() = uri.isContentScheme()
 }
 
 @Throws(Exception::class)