React Native集成AR类Unity项目安卓构建报错：找不到UnityARCore等依赖

问题背景 #

我有一个基于react-native-unity的React Native应用，用<UnityView>组件加载导出的Unity项目。用简单Unity项目导出安卓包放入unity/builds/android/unityLibrary目录后，构建成功且能正常显示Unity内容，但用AR Foundation示例项目导出的安卓包时，安卓构建失败，提示找不到arcore_client、UnityARCore、ARPresto、unityandroidpermissions等依赖。

报错信息 #

FAILURE: Build failed with an exception.

What went wrong:
Could not determine the dependencies of task ':unityLibrary:compileDebugAidl'.
Could not resolve all task dependencies for configuration ':unityLibrary:debugCompileClasspath'.
Could not find :arcore_client:.
Required by:
project :unityLibrary
Could not find :UnityARCore:.
Required by:
project :unityLibrary
Could not find :ARPresto:.
Required by:
project :unityLibrary
Could not find :unityandroidpermissions:.
Required by:
project :unityLibrary

当前配置 #

项目根目录build.gradle #

buildscript {
    ext {
        buildToolsVersion = "33.0.0"
        minSdkVersion = 22
        compileSdkVersion = 33
        targetSdkVersion = 33

        // We use NDK 23 which has both M1 support and is the side-by-side NDK version from AGP.
        ndkVersion = "23.1.7779620"
        
    }
    repositories {
        google()
        mavenCentral()
        flatDir {
            dirs "${project(':unityLibrary').projectDir}/libs"
        }
    }
    dependencies {
        classpath("com.android.tools.build:gradle")
        classpath("com.facebook.react:react-native-gradle-plugin")
    }

}

项目根目录settings.gradle #

rootProject.name = 'projectName'
apply from: file("../node_modules/@react-native-community/cli-platform-android/native_modules.gradle"); applyNativeModulesSettingsGradle(settings)
include ':app'
includeBuild('../node_modules/@react-native/gradle-plugin')
include ':unityLibrary'
project(':unityLibrary').projectDir=new File('../unity/builds/android/unityLibrary')
include ':unityLibrary:xrmanifest.androidlib'

文件结构 #

解决方法 #

1. 补充依赖仓库配置
   AR Foundation项目依赖Google和Unity的专属Maven仓库，需要在项目根目录的build.gradle中添加同级的allprojects块（若原本没有），配置仓库地址：

   allprojects {
       repositories {
           google()
           mavenCentral()
           maven { url "https://maven.unity3d.com" }
           flatDir {
               dirs "${project(':unityLibrary').projectDir}/libs"
           }
       }
   }
   

2. 检查Unity导出的依赖文件
   确认AR Foundation项目导出后，unity/builds/android/unityLibrary/libs目录下存在arcore_client.aar、UnityARCore.aar等相关依赖文件。若缺失，重新导出Unity项目时，确保已正确安装并启用AR Foundation和ARCore插件。

3. 完善子模块引入
   打开Unity导出的安卓项目中的settings.gradle，把里面除unityLibrary外的子模块引入语句复制到React Native项目的settings.gradle中，示例：

   include ':unityLibrary:GoogleARCore'
   include ':unityLibrary:UnityARCore'
   include ':unityLibrary:ARPresto'
   include ':unityLibrary:unityandroidpermissions'
   

4. 清理并重新构建
   进入安卓目录执行以下命令，清理旧构建文件后重新编译：

   cd android
   ./gradlew clean
   ./gradlew assembleDebug
   

内容的提问来源于stack exchange，提问作者Chris