Unity报错‘Exception: Field SDK_INT or type signature not found’的原因与修复

启动Unity项目时触发如下错误：

Exception: Field SDK_INT or type signature not found

完整报错日志：

Exception: Field SDK_INT or type signature  not found
UnityEngine._AndroidJNIHelper.GetFieldID (System.IntPtr jclass, System.String fieldName, System.String signature, System.Boolean isStatic) (at <25cc22fd49c34daaa956e67f0a66ab9d>:0)
UnityEngine.AndroidJNIHelper.GetFieldID (System.IntPtr javaClass, System.String fieldName, System.String signature, System.Boolean isStatic) (at <25cc22fd49c34daaa956e67f0a66ab9d>:0)
UnityEngine._AndroidJNIHelper.GetFieldID[ReturnType] (System.IntPtr jclass, System.String fieldName, System.Boolean isStatic) (at <25cc22fd49c34daaa956e67f0a66ab9d>:0)
UnityEngine.AndroidJNIHelper.GetFieldID[FieldType] (System.IntPtr jclass, System.String fieldName, System.Boolean isStatic) (at <25cc22fd49c34daaa956e67f0a66ab9d>:0)
UnityEngine.AndroidJavaObject._GetStatic[FieldType] (System.String fieldName) (at <25cc22fd49c34daaa956e67f0a66ab9d>:0)
UnityEngine.AndroidJavaObject.GetStatic[FieldType] (System.String fieldName) (at <25cc22fd49c34daaa956e67f0a66ab9d>:0)
UnityEngine.AdaptivePerformance.Google.Android.GoogleAndroidAdaptivePerformanceSubsystem+GoogleAndroidAdaptivePerformanceSubsystemProvider+NativeApi.GetApiLevel () (at ./Library/PackageCache/com.unity.adaptiveperformance.google.android@4fcdb811ad90/Runtime/Provider/GoogleAndroidAdaptivePerformanceSubsystem.cs:392)
UnityEngine.AdaptivePerformance.Google.Android.GoogleAndroidAdaptivePerformanceSubsystem+GoogleAndroidAdaptivePerformanceSubsystemProvider+NativeApi.IsAvailable () (at ./Library/PackageCache/com.unity.adaptiveperformance.google.android@4fcdb811ad90/Runtime/Provider/GoogleAndroidAdaptivePerformanceSubsystem.cs:401)
UnityEngine.AdaptivePerformance.Google.Android.GoogleAndroidAdaptivePerformanceSubsystem.RegisterDescriptor () (at ./Library/PackageCache/com.unity.adaptiveperformance.google.android@4fcdb811ad90/Runtime/Provider/GoogleAndroidAdaptivePerformanceSubsystem.cs:35)

环境信息 #

• Unity版本：6000.0.41f1
• Android SDK版本：34.0.0
• Android NDK版本：27.2.12479018

已确认SDK安装完整且路径正确，提供了Player Settings和External Tools截图，Plane.cs与PlaneGeneratorScript.cs脚本与问题无关。

原因分析 #

该错误由Unity的com.unity.adaptiveperformance.google.android包通过JNI访问Android系统Build.VERSION.SDK_INT字段失败导致，核心诱因包括：

1. Adaptive Performance包版本与Unity 6.x不兼容
2. Android SDK对应API等级的Platform组件未正确安装
3. Player Settings中API等级配置与已安装SDK不匹配
4. 包内部JNI调用的类型签名存在兼容性问题

修复方法 #

• 适配Adaptive Performance包版本：
  打开Package Manager，找到com.unity.adaptiveperformance.google.android包，更新至官方适配Unity 6.x的版本，或回退到经测试兼容的稳定版本。
• 检查SDK Platform组件：
  打开Android Studio的SDK Manager，确认已安装与项目目标API等级一致的Platform组件（如目标API为34则需安装Android 14 Platform）。
• 调整Player Settings配置：
  进入Edit > Project Settings > Player > Android，将Minimum API Level、Target API Level设置为已安装的SDK版本，同时确认JDK、SDK、NDK路径指向正确目录。
• 清理项目缓存：
  删除项目根目录下的Library、Temp、obj文件夹，重启Unity后等待资源重新导入。
• 临时禁用Adaptive Performance包：
  若无需该功能，可在Package Manager中移除com.unity.adaptiveperformance.google.android包，验证项目是否能正常启动，确认问题来源。

内容的提问来源于stack exchange，提问作者Вадим Ткаченко