优化

app/src/main/java/io/legado/app/ui/config/OtherConfigFragment.kt

@@ -80,9 +80,7 @@ class OtherConfigFragment : PreferenceFragmentCompat(),
                 }
             PreferKey.cleanCache -> {
                 BookHelp.clearCache()
-                requireActivity().cacheDir.listFiles()?.forEach {
-                    it.delete()
-                }
+                FileUtils.deleteFile(requireActivity().cacheDir.absolutePath)
                 toast(R.string.clear_cache_success)
             }
             PreferKey.defaultCover -> {

app/src/main/java/io/legado/app/ui/main/MainViewModel.kt

@@ -81,11 +81,7 @@ class MainViewModel(application: Application) : BaseViewModel(application) {
 
     fun postLoad() {
         execute {
-            FileUtils.getDirFile(context.cacheDir, "Fonts").let {
-                if (it.exists()) {
-                    it.delete()
-                }
-            }
+            FileUtils.deleteFile(FileUtils.getPath(context.cacheDir, "Fonts"))
         }
     }
 }