React Native Android构建报错：:app:processDebugResources失败，android:attr/lStar缺失

几天前还能正常运行React Native应用，现在执行yarn run android时构建失败，核心报错为未找到资源android:attr/lStar，尝试修改build.gradle、重新克隆项目均无效。

报错详情 #

本次构建使用了已弃用的Gradle特性，与Gradle 7.0不兼容。
使用'--warning-mode all'查看具体弃用警告。
请参阅https://docs.gradle.org/6.2/userguide/command_line_interface.html#sec:command_line_warnings
212个可执行任务：3个已执行，209个已是最新状态
警告：将新命名空间http://schemas.android.com/repository/android/common/02映射到旧命名空间http://schemas.android.com/repository/android/common/01
警告：将新命名空间http://schemas.android.com/repository/android/generic/02映射到旧命名空间http://schemas.android.com/repository/android/generic/01
警告：将新命名空间http://schemas.android.com/sdk/android/repo/addon2/02映射到旧命名空间http://schemas.android.com/sdk/android/repo/addon2/01
警告：将新命名空间http://schemas.android.com/sdk/android/repo/repository2/02映射到旧命名空间http://schemas.android.com/sdk/android/repo/repository2/01
警告：将新命名空间http://schemas.android.com/sdk/android/repo/sys-img2/02映射到旧命名空间http://schemas.android.com/sdk/android/repo/sys-img2/01

构建失败：出现异常。

* 错误原因：
任务':app:processDebugResources'执行失败。
> 执行com.android.build.gradle.internal.tasks.Workers$ActionFacade时出现失败
  > Android资源链接失败
    C:\Users\username\.gradle\caches\transforms-2\files-2.1\eb9f77e0d5be7277e1d87bb123b4de4c\core-1.7.0\res\values\values.xml:105:5-114:25: AAPT: 错误：未找到资源android:attr/lStar。

当前使用的build.gradle配置 #

项目根目录/android/build.gradle #

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    ext.kotlin_version = '1.3.71'
    ext {
        buildToolsVersion = "30.0.2"
        minSdkVersion = 21
        compileSdkVersion = 30
        targetSdkVersion = 30
    }
    repositories {
        google()
        mavenCentral()
        jcenter()
    }
    dependencies {
        classpath("com.android.tools.build:gradle:3.5.3")
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'com.google.gms:google-services:4.3.8'
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        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")
        }

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

        flatDir {
            dirs 'libs'
        }
    }
}

项目根目录/android/app/build.gradle #

apply plugin: "com.android.application"
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'com.google.gms.google-services'

import com.android.build.OutputFile

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

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

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.rectnativetemplate"
        minSdkVersion rootProject.ext.minSdkVersion
        targetSdkVersion rootProject.ext.targetSdkVersion
        versionCode 4
        versionName "${System.env.VERSION}" ?: "1.0"
        missingDimensionStrategy 'react-native-camera', 'general'
        multiDexEnabled true
    }
    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'
        }
        release {
            if (project.hasProperty('MYAPP_RELEASE_STORE_FILE')) {
                storeFile file(MYAPP_RELEASE_STORE_FILE)
                storePassword MYAPP_RELEASE_STORE_PASSWORD
                keyAlias MYAPP_RELEASE_KEY_ALIAS
                keyPassword MYAPP_RELEASE_KEY_PASSWORD
            }
        }
    }
    buildTypes {
        debug {
            signingConfig signingConfigs.debug
        }
        release {
            // Caution! In production, you need to generate your own keystore file.
            // see https://reactnative.dev/docs/signed-apk-android.
            signingConfig signingConfigs.release
            minifyEnabled enableProguardInReleaseBuilds
            proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"
        }
    }

    packagingOptions {
        pickFirst "lib/armeabi-v7a/libc++_shared.so"
        pickFirst "lib/arm64-v8a/libc++_shared.so"
        pickFirst "lib/x86/libc++_shared.so"
        pickFirst "lib/x86_64/libc++_shared.so"
    }

    // 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 platform('com.google.firebase:firebase-bom:28.3.0')
    implementation 'com.google.firebase:firebase-analytics'
    implementation fileTree(dir: "libs", include: ["*.jar"])
    //noinspection GradleDynamicVersion
    implementation "com.facebook.react:react-native:+"  // From node_modules

    implementation "androidx.swiperefreshlayout:swiperefreshlayout:1.0.0"

    debugImplementation("com.facebook.flipper:flipper:${FLIPPER_VERSION}") {
      exclude group:'com.facebook.fbjni'
    }

    debugImplementation("com.facebook.flipper:flipper-network-plugin:${FLIPPER_VERSION}") {
        exclude group:'com.facebook.flipper'
        exclude group:'com.squareup.okhttp3', module:'okhttp'
    }

    debugImplementation("com.facebook.flipper:flipper-fresco-plugin:${FLIPPER_VERSION}") {
        exclude group:'com.facebook.flipper'
    }

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

    implementation(name: 'amazon-chime-sdk', ext: 'aar')
    implementation(name: 'amazon-chime-sdk-media', ext: 'aar')

    implementation 'com.google.code.gson:gson:2.8.6'
    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.3'
    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.3'
    implementation 'androidx.core:core-ktx:1.1.0'
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
}

// 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'
}

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

//Vector Icons
apply from: "../../node_modules/react-native-vector-icons/fonts.gradle"

解决方案 #

原因说明 #

android:attr/lStar是Android 12（API 31）新增的属性，当项目依赖的androidx.core:core-ktx自动升级到1.7.0及以上版本时，会引用该属性，但当前项目的compileSdkVersion为30，导致资源找不到。

步骤1：升级编译和目标SDK版本 #

修改项目根目录/android/build.gradle中的ext配置：

ext {
    buildToolsVersion = "31.0.0"
    minSdkVersion = 21
    compileSdkVersion = 31
    targetSdkVersion = 31
}

步骤2：升级Android Gradle插件版本 #

修改根目录/android/build.gradle中buildscript的dependencies部分，将Gradle插件版本升级到与compileSdk 31兼容的版本，比如：

classpath("com.android.tools.build:gradle:7.0.4")

步骤3：限制androidx.core版本（可选，若不想升级SDK） #

如果暂时不想升级到API 31，可在android/app/build.gradle的dependencies中强制指定androidx.core:core-ktx为1.6.0版本（该版本未引入lStar属性）：

implementation("androidx.core:core-ktx:1.6.0") {
    force = true
}

替换原有的implementation 'androidx.core:core-ktx:1.1.0'。

步骤4：清理缓存并重新构建 #

执行以下命令清理缓存后重新构建：

./gradlew clean
yarn cache clean
rm -rf node_modules && yarn install
yarn run android

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