diff --git a/app/src/main/java/io/legado/app/ui/filechooser/utils/ConvertUtils.kt b/app/src/main/java/io/legado/app/ui/filechooser/utils/ConvertUtils.kt
index 0e0ae30a8..0d9c2dd81 100644
--- a/app/src/main/java/io/legado/app/ui/filechooser/utils/ConvertUtils.kt
+++ b/app/src/main/java/io/legado/app/ui/filechooser/utils/ConvertUtils.kt
@@ -11,7 +11,6 @@ import java.io.IOException
 import java.io.InputStream
 import java.io.InputStreamReader
 import java.text.DecimalFormat
-import java.util.*
 
 /**
  * 数据类型转换、单位转换
@@ -51,10 +50,6 @@ object ConvertUtils {
         }
     }
 
-    fun toString(objects: Array<Any>): String {
-        return Arrays.deepToString(objects)
-    }
-
     fun toString(objects: Array<Any>, tag: String): String {
         val sb = StringBuilder()
         for (`object` in objects) {
diff --git a/app/src/main/java/io/legado/app/ui/filechooser/utils/FileUtils.kt b/app/src/main/java/io/legado/app/ui/filechooser/utils/FileUtils.kt
index 5506fe8ab..71e838cae 100644
--- a/app/src/main/java/io/legado/app/ui/filechooser/utils/FileUtils.kt
+++ b/app/src/main/java/io/legado/app/ui/filechooser/utils/FileUtils.kt
@@ -80,7 +80,7 @@ object FileUtils {
         }
         for (dir in dirs) {
             val file = dir.absoluteFile
-            if (!ConvertUtils.toString(excludeDirs).contains(file.name)) {
+            if (!excludeDirs.contentDeepToString().contains(file.name)) {
                 dirList.add(file)
             }
         }
@@ -193,8 +193,8 @@ object FileUtils {
         val file = File(startDirPath)
         return file.listFiles { dir, name ->
             //返回当前目录所有以某些扩展名结尾的文件
-            val extension = FileUtils.getExtension(name)
-            ConvertUtils.toString(allowExtensions).contains(extension)
+            val extension = getExtension(name)
+            allowExtensions.contentDeepToString().contains(extension)
         }
     }