Unity安卓打包报错：当前上下文中不存在‘FileUtil’的解决咨询

Hey there! Let's break down why you're hitting this error and how to fix it with a reliable alternative.

The Root Cause #

FileUtil is part of the UnityEditor namespace — these classes are only meant to run inside the Unity Editor, not in your compiled Android app. When you build for Android, Unity strips out all Editor-specific code, which is why the method works in the editor but throws an error during packaging. Adding using System.IO; didn't help because you were still trying to call an Editor-only utility.

The Alternative: Use System.IO.Directory #

Instead of FileUtil, use the standard .NET Directory class from System.IO — it's fully supported in runtime builds (including Android) and does exactly what you need. Here's how to rewrite your Delete method:

using System.IO; // Keep this using directive, it's required for Directory

public void Delete() { 
    P = EventSystem.current.currentSelectedGameObject.transform; 
    // Use Path.Combine to safely build cross-platform paths (avoids slash issues)
    string targetFolderPath = Path.Combine(Application.persistentDataPath, "ARPortal", P.parent.gameObject.name);
    
    // Check if the folder exists before trying to delete it (prevents errors)
    if (Directory.Exists(targetFolderPath))
    {
        // The second parameter "true" tells it to delete all files/subfolders recursively
        Directory.Delete(targetFolderPath, true);
    }
    
    P.gameObject.SetActive(false); 
    P.parent.GetChild(4).gameObject.SetActive(true); // Simplified redundant transform access
    counter = 0; 
}

Extra Tips #

• Path Safety: Path.Combine is better than string concatenation because it automatically handles platform-specific path separators (like / vs \).
• Permissions: For Android, make sure you've enabled necessary file access permissions in Unity's Player Settings. Using Application.persistentDataPath usually doesn't require extra permissions, but double-check scoped storage settings if targeting Android 10+.
• Editor vs Runtime: Always remember: any class under UnityEditor is for editor tools only. Stick to System.IO or Unity's runtime file utilities (like File/Directory) for code that runs in your published app.

内容的提问来源于stack exchange，提问作者Starboi97