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 5a30aba70..7925fccf8 100644
--- a/app/src/main/java/io/legado/app/help/BookHelp.kt
+++ b/app/src/main/java/io/legado/app/help/BookHelp.kt
@@ -9,11 +9,7 @@ import io.legado.app.data.entities.ReplaceRule
 import io.legado.app.help.coroutine.Coroutine
 import io.legado.app.model.analyzeRule.AnalyzeUrl
 import io.legado.app.model.localBook.LocalBook
-import io.legado.app.utils.FileUtils
-import io.legado.app.utils.MD5Utils
-import io.legado.app.utils.externalFilesDir
-import io.legado.app.utils.postEvent
-import io.legado.app.utils.NetworkUtils
+import io.legado.app.utils.*
 import kotlinx.coroutines.Dispatchers.IO
 import kotlinx.coroutines.Dispatchers.Main
 import kotlinx.coroutines.withContext
@@ -44,7 +40,7 @@ object BookHelp {
 
     fun clearCache() {
         FileUtils.deleteFile(
-            FileUtils.getPath(downloadDir, subDirs = *arrayOf(cacheFolderName))
+            FileUtils.getPath(downloadDir, subDirs = arrayOf(cacheFolderName))
         )
     }
 
@@ -73,7 +69,7 @@ object BookHelp {
         FileUtils.createFileIfNotExist(
             downloadDir,
             formatChapterName(bookChapter),
-            subDirs = *arrayOf(cacheFolderName, bookFolderName(book))
+            subDirs = arrayOf(cacheFolderName, bookFolderName(book))
         ).writeText(content)
         //保存图片
         content.split("\n").forEach {
@@ -95,24 +91,24 @@ object BookHelp {
             FileUtils.createFileIfNotExist(
                 downloadDir,
                 "${MD5Utils.md5Encode16(src)}${src.substringAfterLast(".").substringBefore(",")}",
-                subDirs = *arrayOf(cacheFolderName, bookFolderName(book), cacheImageFolderName)
+                subDirs = arrayOf(cacheFolderName, bookFolderName(book), cacheImageFolderName)
             ).writeBytes(it)
         }
     }
     
     fun getImage(book:Book, src:String): File {
         return FileUtils.getFile(
-                    downloadDir,
-                    "${MD5Utils.md5Encode16(src)}${src.substringAfterLast(".").substringBefore(",")}",
-                    subDirs = *arrayOf(cacheFolderName, bookFolderName(book), cacheImageFolderName)
-                )
+            downloadDir,
+            "${MD5Utils.md5Encode16(src)}${src.substringAfterLast(".").substringBefore(",")}",
+            subDirs = arrayOf(cacheFolderName, bookFolderName(book), cacheImageFolderName)
+        )
     }
 
     fun getChapterFiles(book: Book): List<String> {
         val fileNameList = arrayListOf<String>()
         FileUtils.createFolderIfNotExist(
             downloadDir,
-            subDirs = *arrayOf(cacheFolderName, bookFolderName(book))
+            subDirs = arrayOf(cacheFolderName, bookFolderName(book))
         ).list()?.let {
             fileNameList.addAll(it)
         }
@@ -126,7 +122,7 @@ object BookHelp {
             FileUtils.exists(
                 downloadDir,
                 formatChapterName(bookChapter),
-                subDirs = *arrayOf(cacheFolderName, bookFolderName(book))
+                subDirs = arrayOf(cacheFolderName, bookFolderName(book))
             )
         }
     }
@@ -138,7 +134,7 @@ object BookHelp {
             val file = FileUtils.getFile(
                 downloadDir,
                 formatChapterName(bookChapter),
-                subDirs = *arrayOf(cacheFolderName, bookFolderName(book))
+                subDirs = arrayOf(cacheFolderName, bookFolderName(book))
             )
             if (file.exists()) {
                 return file.readText()
@@ -154,7 +150,7 @@ object BookHelp {
             FileUtils.createFileIfNotExist(
                 downloadDir,
                 formatChapterName(bookChapter),
-                subDirs = *arrayOf(cacheFolderName, bookFolderName(book))
+                subDirs = arrayOf(cacheFolderName, bookFolderName(book))
             ).delete()
         }
     }
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 03ea7a84b..bb9a6327e 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
@@ -107,7 +107,7 @@ object Backup {
                         DocumentUtils.createFileIfNotExist(
                             treeDoc,
                             fileName,
-                            subDirs = *arrayOf("auto")
+                            subDirs = arrayOf("auto")
                         )?.writeBytes(context, file.readBytes())
                     } else {
                         treeDoc.findFile(fileName)?.delete()
diff --git a/app/src/main/java/io/legado/app/model/localBook/AnalyzeTxtFile.kt b/app/src/main/java/io/legado/app/model/localBook/AnalyzeTxtFile.kt
index f78471fb9..c4bfb6ea6 100644
--- a/app/src/main/java/io/legado/app/model/localBook/AnalyzeTxtFile.kt
+++ b/app/src/main/java/io/legado/app/model/localBook/AnalyzeTxtFile.kt
@@ -248,7 +248,7 @@ class AnalyzeTxtFile {
             val rootFile = App.INSTANCE.getExternalFilesDir(null)
                 ?: App.INSTANCE.externalCacheDir
                 ?: App.INSTANCE.cacheDir
-            FileUtils.createFolderIfNotExist(rootFile, subDirs = *arrayOf(folderName))
+            FileUtils.createFolderIfNotExist(rootFile, subDirs = arrayOf(folderName))
         }
 
         fun getContent(book: Book, bookChapter: BookChapter): String {
@@ -264,7 +264,7 @@ class AnalyzeTxtFile {
         private fun getBookFile(book: Book): File {
             if (book.bookUrl.isContentPath()) {
                 val uri = Uri.parse(book.bookUrl)
-                val bookFile = FileUtils.getFile(cacheFolder, book.originName, subDirs = *arrayOf())
+                val bookFile = FileUtils.getFile(cacheFolder, book.originName, subDirs = arrayOf())
                 if (!bookFile.exists()) {
                     bookFile.createNewFile()
                     DocumentUtils.readBytes(App.INSTANCE, uri)?.let {
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 d82f6bca0..047ab0cec 100644
--- a/app/src/main/java/io/legado/app/utils/FileUtils.kt
+++ b/app/src/main/java/io/legado/app/utils/FileUtils.kt
@@ -9,7 +9,7 @@ import java.io.IOException
 object FileUtils {
 
     fun exists(root: File, fileName: String, vararg subDirs: String): Boolean {
-        return getFile(root, fileName, subDirs = *subDirs).exists()
+        return getFile(root, fileName, subDirs = subDirs).exists()
     }
 
     fun createFileIfNotExist(root: File, fileName: String, vararg subDirs: String): File {
@@ -18,7 +18,7 @@ object FileUtils {
     }
 
     fun createFolderIfNotExist(root: File, vararg subDirs: String): File {
-        val filePath = getPath(root, subDirs = *subDirs)
+        val filePath = getPath(root, subDirs = subDirs)
         return createFolderIfNotExist(filePath)
     }
 
@@ -55,7 +55,7 @@ object FileUtils {
     }
 
     fun getDirFile(root: File, vararg subDirs: String): File {
-        val filePath = getPath(root, subDirs = *subDirs)
+        val filePath = getPath(root, subDirs = subDirs)
         return File(filePath)
     }