在使用 ReactNative 的最新 AndroidX 版本的 Android 应用程序中使用 Unity 作为库时如何解决“找不到 libmain.so”

Question

我们有一个 ReactNative 应用程序，它已经成功地将基于react-native-unity-view 的Unity集成为一个库。但是，在 ReactNative 上关于 AndroidX 和最新 SDK 更改的最新更新之后，我们遇到了问题"libmain.so not found"。此异常发生在第一次尝试显示 Unity-View 时。

SO 上有一个类似的问题，请不要标记为重复，因为我们的方法可能不同且特别，因为我们在这里提供了更多详细信息。

GitHub 上有一个正在运行且仍在运行的示例（基于 ReactNative 0.57）：https : //github.com/f111fei/react-native-unity-demo。只要这个项目基于 ReactNative 0.57 及其适当的 gradle-settings，一切正常。但是，一旦我们升级到最新的 ReactNative 版本（例如甚至 0.60），这为我们提供了一个与旧版本非常不同的 android 文件夹），问题就会发生在应用程序崩溃时。（我们还尝试从头开始设置所有内容，以排除此问题是由于升级引起的可能性。使用 RN 0.57 一切仍然正常，而使用 RN 0.60 及更高版本则不行）

例外情况如下：

E Unity   : Failed to load 'libmain.so', the application will terminate.
D AndroidRuntime: Shutting down VM
E AndroidRuntime: FATAL EXCEPTION: main
E AndroidRuntime: Process: com.rnunitydemo, PID: 16887
E AndroidRuntime: java.lang.UnsatisfiedLinkError: dalvik.system.PathClassLoader[DexPathList[[zip file "/data/app/com.rnunitydemo-bKGyotdcwjVnBxuR9zLE4Q==/base.apk"],nativeLibraryDirectories=[/data/app/com.rnunitydemo-bKGyotdcwjVnBxuR9zLE4Q==/lib/arm64, /data/app/com.rnunitydemo-bKGyotdcwjVnBxuR9zLE4Q==/base.apk!/lib/arm64-v8a, /system/lib64, /product/lib64]]] couldn't find "libmain.so"

首先，我将列出发生崩溃的最新版本的 android-folder 和 gradle-files。之后，我将列出一切正常的文件：

不工作（较新）版本

./android/build.gradle:

buildscript {
    ext {
        buildToolsVersion = "28.0.3"
        minSdkVersion = 16
        compileSdkVersion = 28
        targetSdkVersion = 28
    }
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath("com.android.tools.build:gradle:3.4.2")
    }
}

allprojects {
    repositories {
        mavenLocal()
        maven {
            // All of React Native (JS, Obj-C sources, Android binaries) is installed from npm
            url("$rootDir/../node_modules/react-native/android")
        }
        maven {
            // Android JSC is installed from npm
            url("$rootDir/../node_modules/jsc-android/dist")
        }

        google()
        jcenter()
        maven { url 'https://jitpack.io' }
    }
}

./android/settings.gradle:

rootProject.name = 'rnunitydemo'

apply from: file("../node_modules/@react-native-community/cli-platform-android/native_modules.gradle"); applyNativeModulesSettingsGradle(settings)

include ":UnityExport"
project(":UnityExport").projectDir = file("./UnityExport")


include ':app'

./android/app/build.gradle：

apply plugin: "com.android.application"

import com.android.build.OutputFile

project.ext.react = [
    entryFile: "index.js",
    enableHermes: false,  // clean and rebuild if changing
]

apply from: "../../node_modules/react-native/react.gradle"

def enableSeparateBuildPerCPUArchitecture = false

def enableProguardInReleaseBuilds = false

def jscFlavor = 'org.webkit:android-jsc:+'

def enableHermes = project.ext.react.get("enableHermes", false);

android {
    compileSdkVersion rootProject.ext.compileSdkVersion

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    defaultConfig {
        applicationId "com.rnunitydemo"
        minSdkVersion rootProject.ext.minSdkVersion
        targetSdkVersion rootProject.ext.targetSdkVersion
        versionCode 1
        versionName "1.0"
    }
    splits {
        abi {
            reset()
            enable enableSeparateBuildPerCPUArchitecture
            universalApk false  // If true, also generate a universal APK
            include "armeabi-v7a", "x86", "arm64-v8a", "x86_64"
        }
    }
    signingConfigs {
        debug {
            storeFile file('debug.keystore')
            storePassword 'android'
            keyAlias 'androiddebugkey'
            keyPassword 'android'
        }
    }
    buildTypes {
        debug {
            signingConfig signingConfigs.debug
        }
        release {
            signingConfig signingConfigs.debug
            minifyEnabled enableProguardInReleaseBuilds
            proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"
        }
    }
    // applicationVariants are e.g. debug, release
    applicationVariants.all { variant ->
        variant.outputs.each { output ->
            // For each separate APK per architecture, set a unique version code as described here:
            // https://developer.android.com/studio/build/configure-apk-splits.html
            def versionCodes = ["armeabi-v7a": 1, "x86": 2, "arm64-v8a": 3, "x86_64": 4]
            def abi = output.getFilter(OutputFile.ABI)
            if (abi != null) {  // null for the universal-debug, universal-release variants
                output.versionCodeOverride =
                        versionCodes.get(abi) * 1048576 + defaultConfig.versionCode
            }

        }
    }
}

dependencies {
    implementation fileTree(dir: "libs", include: ["*.jar"])
    implementation "com.facebook.react:react-native:+"  // From node_modules

    if (enableHermes) {
        def hermesPath = "../../node_modules/hermes-engine/android/";
        debugImplementation files(hermesPath + "hermes-debug.aar")
        releaseImplementation files(hermesPath + "hermes-release.aar")
    } else {
        implementation jscFlavor
    }
}

task copyDownloadableDepsToLibs(type: Copy) {
    from configurations.compile
    into 'libs'
}

apply from: file("../../node_modules/@react-native-community/cli-platform-android/native_modules.gradle"); applyNativeModulesAppBuildGradle(project)

./android/UnityExport/build.gradle：

// GENERATED BY UNITY. REMOVE THIS COMMENT TO PREVENT OVERWRITING WHEN EXPORTING AGAIN

buildscript {
    repositories {
        google()
        jcenter()
    }

    dependencies {
        classpath("com.android.tools.build:gradle:3.4.2")
    }
}

allprojects {
    repositories {
        google()
        jcenter()
        flatDir {
            dirs 'libs'
        }
    }
}

apply plugin: 'com.android.library'


dependencies {
    api fileTree(include: ['*.jar'], dir: 'libs')
}

android {
    compileSdkVersion 28
    buildToolsVersion '28.0.2'

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    defaultConfig {
        minSdkVersion 16
        targetSdkVersion 28
        ndk {
            abiFilters 'armeabi-v7a', 'x86'
        }
        multiDexEnabled true
        versionCode 1
        versionName '0.1'
    }

    lintOptions {
        abortOnError false
    }

    aaptOptions {
        noCompress = ['.unity3d', '.ress', '.resource', '.obb']
        ignoreAssetsPattern = "!.svn:!.git:!.ds_store:!*.scc:.*:!CVS:!thumbs.db:!picasa.ini:!*~"
    }

    buildTypes {
        debug {
            minifyEnabled false
            useProguard false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-unity.txt'
            signingConfig signingConfigs.debug
            jniDebuggable true
        }
        release {
            minifyEnabled false
            useProguard false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-unity.txt'
            signingConfig signingConfigs.debug
        }
    }

    packagingOptions {
        doNotStrip '*/armeabi-v7a/*.so'
        doNotStrip '*/x86/*.so'
    }


}

一旦 Unity 启动，上述所有这些文件都会导致崩溃（“libmain.so not found”）。

工作（旧）版本

在我们之前的版本中，正如它可以在 GitHub 上找到的那样，一切正常：

./android/build.gradle:

buildscript {
    ext {
        buildToolsVersion = "27.0.3"
        minSdkVersion = 16
        compileSdkVersion = 27
        targetSdkVersion = 26
        supportLibVersion = "27.1.1"
    }
    repositories {
        jcenter()
        google()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.4'
    }
}

allprojects {
    repositories {
        mavenLocal()
        jcenter()
        google()
        maven {
            // All of React Native (JS, Obj-C sources, Android binaries) is installed from npm
            url "$rootDir/../node_modules/react-native/android"
        }
        flatDir {
            dirs project(':UnityExport').file('libs')
        }
    }
}

task wrapper(type: Wrapper) {
    gradleVersion = '4.4'
    distributionUrl = distributionUrl.replace("bin", "all")
}

./android/settings.gradle:

rootProject.name = 'rnunitydemo'
include ':react-native-unity-view'
project(':react-native-unity-view').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-unity-view/android')

include ":UnityExport"
project(":UnityExport").projectDir = file("./UnityExport")

include ':app'

./android/app/build.gradle：

apply plugin: "com.android.application"

import com.android.build.OutputFile

project.ext.react = [
    entryFile: "index.js"
]

apply from: "../../node_modules/react-native/react.gradle"

def enableSeparateBuildPerCPUArchitecture = false

/**
 * Run Proguard to shrink the Java bytecode in release builds.
 */
def enableProguardInReleaseBuilds = false

android {
    compileSdkVersion rootProject.ext.compileSdkVersion
    buildToolsVersion rootProject.ext.buildToolsVersion

    defaultConfig {
        applicationId "com.rnunitydemo"
        minSdkVersion rootProject.ext.minSdkVersion
        targetSdkVersion rootProject.ext.targetSdkVersion
        versionCode 1
        versionName "1.0"
        ndk {
            abiFilters "armeabi-v7a", "x86"
        }
    }

    lintOptions {
        checkReleaseBuilds false
        // Or, if you prefer, you can continue to check for errors in release builds,
        // but continue the build even when errors are found:
        abortOnError false
    }

    splits {
        abi {
            reset()
            enable enableSeparateBuildPerCPUArchitecture
            universalApk false  // If true, also generate a universal APK
            include "armeabi-v7a", "x86"
        }
    }

    signingConfigs {
        release {
            // storeFile file(MYAPP_RELEASE_STORE_FILE)
            // storePassword MYAPP_RELEASE_STORE_PASSWORD
            // keyAlias MYAPP_RELEASE_KEY_ALIAS
            // keyPassword MYAPP_RELEASE_KEY_PASSWORD
        }
    }

    buildTypes {
        debug {
            manifestPlaceholders = [
                "DEBUGGABLE": "true"
            ]
        }
        release {
            manifestPlaceholders = [
                "DEBUGGABLE": "false"
            ]
            minifyEnabled enableProguardInReleaseBuilds
            proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"
            signingConfig signingConfigs.release
        }
    }
    // applicationVariants are e.g. debug, release
    applicationVariants.all { variant ->
        variant.outputs.each { output ->
            // For each separate APK per architecture, set a unique version code as described here:
            // http://tools.android.com/tech-docs/new-build-system/user-guide/apk-splits
            def versionCodes = ["armeabi-v7a":1, "x86":2]
            def abi = output.getFilter(OutputFile.ABI)
            if (abi != null) {  // null for the universal-debug, universal-release variants
                output.versionCodeOverride =
                        versionCodes.get(abi) * 1048576 + defaultConfig.versionCode
            }
        }
    }
}

dependencies {
    compile project(':react-native-unity-view')
    implementation fileTree(dir: "libs", include: ["*.jar"])
    implementation "com.android.support:appcompat-v7:${rootProject.ext.supportLibVersion}"
    implementation "com.facebook.react:react-native:+"  // From node_modules
}

// Run this once to be able to run the application with BUCK
// puts all compile dependencies into folder libs for BUCK to use
task copyDownloadableDepsToLibs(type: Copy) {
    from configurations.compile
    into 'libs'
}

./android/UnityExport/build.gradle：

(same as above)

在官方的 Unity2D-Forums 中还有一些根据这个问题的其他报告，但没有任何可行的解决方案。根据评论，我们知道在build.gradle -Files（来自我们的应用程序和来自 UnityExport 的 build-gradle）中使用了相同的abiFilter -Setting ，但它也没有解决问题。

有人可以帮忙吗？

** 更新 **

开发机系统信息：

System:
    OS: macOS Mojave 10.14.6
    CPU: (16) x64 Intel(R) Core(TM) i9-9980HK CPU @ 2.40GHz
    Memory: 112.35 MB / 32.00 GB
    Shell: 5.0.11 - /usr/local/bin/bash

  SDKs:
    iOS SDK:
      Platforms: iOS 13.2, DriverKit 19.0, macOS 10.15, tvOS 13.2, watchOS 6.1
    Android SDK:
      API Levels: 23, 25, 26, 27, 28, 29
      Build Tools: 23.0.1, 25.0.0, 25.0.1, 25.0.2, 26.0.1, 27.0.3, 28.0.3, 29.0.0, 29.0.2
      System Images: android-29 | Google APIs Intel x86 Atom
      Android NDK: 20.0.5594570
  IDEs:
    Android Studio: 3.5 AI-191.8026.42.35.5900203
    Xcode: 11.2.1/11B500 - /usr/bin/xcodebuild
  Binaries:
    Node: 10.17.0 - /usr/local/opt/node@10/bin/node
    Yarn: 1.16.0 - /usr/local/bin/yarn
    npm: 6.11.3 - /usr/local/opt/node@10/bin/npm
    Watchman: 4.9.0 - /usr/local/bin/watchman
  npmPackages:
    react: 16.9.0 => 16.9.0
    react-native: 0.61.4 => 0.61.4
  npmGlobalPackages:
    react-native-cli: 2.0.1

Answer 1

我现在可以自己回答了。该问题是由不兼容 ARM64 的 Unity 导出引起的，除非手动应用多个设置。方法如下：

Bevor 为 Android 构建，我们需要在“播放器设置”中调整一些设置，以使 ARM64 可用：

1. 将“脚本后端”从 Mono 切换到 ILCPP，这使我们能够：
2. 在目标架构下选择“ARM64”

如果您在构建时遇到“未找到 NDK”之类的错误，请确保 Unity 已下载并安装了自己的 NDK 副本：

记住所有这些将使我们能够链接到这些库而不会找不到“libmain.so”。

Answer 2

请将以下行添加到您的 string.xml 中

<string name="game_view_content_description">Game view</string>

之后将以下代码段添加到您的应用程序级别的 gradle 文件中

defaultConfig {
        ndk {
            abiFilters 'armeabi-v7a', 'x86'
        }
    }

就是这样。享受编码！！