diff --git a/QuickLook.Plugin/QuickLook.Plugin.AppViewer/PackageParsers/Apk/ApiLevel.cs b/QuickLook.Plugin/QuickLook.Plugin.AppViewer/PackageParsers/Apk/ApiLevel.cs
index 056e0d5..d1dc4f0 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.AppViewer/PackageParsers/Apk/ApiLevel.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.AppViewer/PackageParsers/Apk/ApiLevel.cs
@@ -1,4 +1,21 @@
-using System.Collections.Generic;
+// Copyright © 2017-2025 QL-Win Contributors
+//
+// This file is part of QuickLook program.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System.Collections.Generic;
 
 namespace QuickLook.Plugin.AppViewer.PackageParsers.Apk;
 
@@ -14,6 +31,11 @@ public class ApiLevel
 
     public override string ToString()
     {
+        if (AndroidVersion == null || Codename == null || Release == null)
+        {
+            return $"API Level {APILevel}";
+        }
+
         return $"API Level {APILevel} ({AndroidVersion} {Codename} {Release})";
     }
 
@@ -27,9 +49,9 @@ public class ApiLevel
         return new ApiLevel
         {
             APILevel = apiLevel,
-            AndroidVersion = $"API Level {apiLevel}",
-            Codename = "Unknown",
-            Release = "Unknown"
+            AndroidVersion = null,
+            Codename = null,
+            Release = null,
         };
     }
 
@@ -40,7 +62,7 @@ public class ApiLevel
             APILevel = "35",
             AndroidVersion = "Android 15",
             Codename = "VanillaIceCream",
-            Release = "开发中（2025）"
+            Release = "2025"
         },
         ["34"] = new ApiLevel
         {