评估项目“:app”时出现问题。 > 无法对 null 对象调用 getAbsolutePath() 方法

我面临着 React Native 构建的问题。无法进一步进行，并且在任何地方都找不到解决方案。这是我的 build.gradle 文件

import org.apache.tools.ant.taskdefs.condition.Os


buildscript {
ext {
    buildToolsVersion = "31.0.0"
    minSdkVersion = 21
    compileSdkVersion = 31
    targetSdkVersion = 31 
    kotlinVersion = "1.5.31"


    if (findProperty('android.kotlinVersion')) {
        kotlinVersion = findProperty('android.kotlinVersion')
    }
    frescoVersion = findProperty('expo.frescoVersion') ?: '2.5.0'

    if (System.properties['os.arch'] == 'aarch64') {
        
        ndkVersion = '24.0.8215888'
    } else {
        
        ndkVersion = '21.4.7075529'
    }
}
repositories {
    google()
    mavenCentral()
}
dependencies {
    classpath('com.android.tools.build:gradle:7.3.0')
    classpath('com.facebook.react:react-native-gradle-plugin')
    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion"
    classpath('de.undercouch:gradle-download-task:4.1.2')
    classpath 'com.google.gms:google-services:4.3.13'
    
}}
allprojects {
repositories {
    mavenLocal()
    maven {
        
        url(new File(['node', '--print', "require.resolve('react-native/package.json')"].execute(null, rootDir).text.trim(), '../android'))
    }
    maven {
       
        url(new File(['node', '--print', "require.resolve('jsc-android/package.json')"].execute(null, rootDir).text.trim(), '../dist'))
    }

    google()
    mavenCentral {
       
        content {
            excludeGroup 'com.facebook.react'
        }
    }
    maven { url 'https://www.jitpack.io' }
    maven { url 'https://jcenter.bintray.com' }
}}

我的 app/build.gradle 是：

apply plugin: "com.android.application"

apply plugin: 'com.google.gms.google-services'

import com.android.build.OutputFile
import org.apache.tools.ant.taskdefs.condition.Os

def projectRoot = rootDir.getAbsoluteFile().getParentFile().getAbsolutePath()

project.ext.react = [
entryFile: ["node", "-e", "require('expo/scripts/resolveAppEntry')", projectRoot, "android"].execute(null, rootDir).text.trim(),
enableHermes: (findProperty('expo.jsEngine') ?: "jsc") == "hermes",
cliPath: new File(["node", "--print", "require.resolve('react-native/package.json')"].execute(null, rootDir).text.trim()).getParentFile().getAbsolutePath() + "/cli.js",
hermesCommand: new File(["node", "--print", "require.resolve('hermes-engine/package.json')"].execute(null, rootDir).text.trim()).getParentFile().getAbsolutePath() + "/%OS-BIN%/hermesc",
composeSourceMapsPath: new File(["node", "--print", "require.resolve('react-native/package.json')"].execute(null, rootDir).text.trim()).getParentFile().getAbsolutePath() + "/scripts/compose-source-maps.js",]

apply from: new File(["node", "--print", "require.resolve('react-native/package.json')"].execute(null, rootDir).text.trim(), "../react.gradle")

def enableSeparateBuildPerCPUArchitecture = false

def enableProguardInReleaseBuilds = (findProperty('android.enableProguardInReleaseBuilds') ?: false).toBoolean()

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

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

def reactNativeArchitectures() {
def value = project.getProperties().get("reactNativeArchitectures")
return value ? value.split(",") : ["armeabi-v7a", "x86", "x86_64", "arm64-v8a"]}

android {
ndkVersion rootProject.ext.ndkVersion
compileSdkVersion rootProject.ext.compileSdkVersion

defaultConfig {
    applicationId 'xxx.xxxx.xxxx'
    minSdkVersion rootProject.ext.minSdkVersion
    targetSdkVersion rootProject.ext.targetSdkVersion
    versionCode 1
    versionName "1.0.0"
    buildConfigField "boolean", "IS_NEW_ARCHITECTURE_ENABLED", isNewArchitectureEnabled().toString()

    if (isNewArchitectureEnabled()) {
        externalNativeBuild {
            ndkBuild {
                arguments "APP_PLATFORM=android-21",
                    "APP_STL=c++_shared",
                    "NDK_TOOLCHAIN_VERSION=clang",
                    "GENERATED_SRC_DIR=$buildDir/generated/source",
                    "PROJECT_BUILD_DIR=$buildDir",
                    "REACT_ANDROID_DIR=$rootDir/../node_modules/react-native/ReactAndroid",
                    "REACT_ANDROID_BUILD_DIR=$rootDir/../node_modules/react-native/ReactAndroid/build"
                cFlags "-Wall", "-Werror", "-fexceptions", "-frtti", "-DWITH_INSPECTOR=1"
                cppFlags "-std=c++17"
               
                targets "baseapp_appmodules"
                if (Os.isFamily(Os.FAMILY_WINDOWS)) {
                    arguments "NDK_APP_SHORT_COMMANDS=true"
                }
            }
        }
        if (!enableSeparateBuildPerCPUArchitecture) {
            ndk {
                abiFilters (*reactNativeArchitectures())
            }
        }
    }
}

if (isNewArchitectureEnabled()) {
    externalNativeBuild {
        ndkBuild {
            path "$projectDir/src/main/jni/Android.mk"
        }
    }
    def reactAndroidProjectDir = project(':ReactAndroid').projectDir
    def packageReactNdkDebugLibs = tasks.register("packageReactNdkDebugLibs", Copy) {
        dependsOn(":ReactAndroid:packageReactNdkDebugLibsForBuck")
        from("$reactAndroidProjectDir/src/main/jni/prebuilt/lib")
        into("$buildDir/react-ndk/exported")
    }
    def packageReactNdkReleaseLibs = tasks.register("packageReactNdkReleaseLibs", Copy) {
        dependsOn(":ReactAndroid:packageReactNdkReleaseLibsForBuck")
        from("$reactAndroidProjectDir/src/main/jni/prebuilt/lib")
        into("$buildDir/react-ndk/exported")
    }
    afterEvaluate {
        
        preDebugBuild.dependsOn(packageReactNdkDebugLibs)
        preReleaseBuild.dependsOn(packageReactNdkReleaseLibs)

        configureNdkBuildRelease.dependsOn(preReleaseBuild)
        configureNdkBuildDebug.dependsOn(preDebugBuild)
        reactNativeArchitectures().each { architecture ->
            tasks.findByName("configureNdkBuildDebug[${architecture}]")?.configure {
                dependsOn("preDebugBuild")
            }
            tasks.findByName("configureNdkBuildRelease[${architecture}]")?.configure {
                dependsOn("preReleaseBuild")
            }
        }
    }
}

splits {
    abi {
        reset()
        enable enableSeparateBuildPerCPUArchitecture
        universalApk false  
        include (*reactNativeArchitectures())
    }
}
signingConfigs {
    debug {
        storeFile file('debug.keystore')
        storePassword 'android'
        keyAlias 'androiddebugkey'
        keyPassword 'android'
    }
    release {
        if (project.hasProperty('MYAPP_UPLOAD_STORE_FILE')) {
            storeFile file(MYAPP_UPLOAD_STORE_FILE)
            storePassword MYAPP_UPLOAD_STORE_PASSWORD
            keyAlias MYAPP_UPLOAD_KEY_ALIAS
            keyPassword MYAPP_UPLOAD_KEY_PASSWORD
        }
    }
}
buildTypes {
    debug {
        signingConfig signingConfigs.debug
    }
    release {
        
        signingConfig signingConfigs.release
        minifyEnabled enableProguardInReleaseBuilds
        proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"
    }
}

applicationVariants.all { variant ->
    variant.outputs.each { output ->
        
        def versionCodes = ["armeabi-v7a": 1, "x86": 2, "arm64-v8a": 3, "x86_64": 4]
        def abi = output.getFilter(OutputFile.ABI)
        if (abi != null) {  
            output.versionCodeOverride =
                    versionCodes.get(abi) * 1048576 + defaultConfig.versionCode
        }

    }
}}

["pickFirsts", "excludes", "merges", "doNotStrip"].each { prop ->
// Split option: 'foo,bar' -> ['foo', 'bar']
def options = (findProperty("android.packagingOptions.$prop") ?: "").split(",");
// Trim all elements in place.
for (i in 0..<options.size()) options[i] = options[i].trim();
// `[] - ""` is essentially `[""].filter(Boolean)` removing all empty strings.
options -= ""

if (options.length > 0) {
    println "android.packagingOptions.$prop += $options ($options.length)"
    options.each {
        android.packagingOptions[prop] += it
    }
}}

dependencies {
implementation fileTree(dir: "libs", include: ["*.jar"])

implementation platform('com.google.firebase:firebase-bom:30.3.1')
implementation "com.facebook.react:react-native:+"  // From node_modules
implementation 'com.twitter.sdk.android:twitter-core:3.2.0'
implementation 'com.google.android.gms:play-services-auth:20.2.0'
implementation 'com.google.firebase:firebase-analytics'

def isGifEnabled = (findProperty('expo.gif.enabled') ?: "") == "true";
def isWebpEnabled = (findProperty('expo.webp.enabled') ?: "") == "true";
def isWebpAnimatedEnabled = (findProperty('expo.webp.animated') ?: "") == "true";
def frescoVersion = rootProject.ext.frescoVersion

if (isGifEnabled || isWebpEnabled) {
    implementation "com.facebook.fresco:fresco:${frescoVersion}"
    implementation "com.facebook.fresco:imagepipeline-okhttp3:${frescoVersion}"
}

if (isGifEnabled) {
    implementation "com.facebook.fresco:animated-gif:${frescoVersion}"
}

if (isWebpEnabled) {
    implementation "com.facebook.fresco:webpsupport:${frescoVersion}"
    if (isWebpAnimatedEnabled) {
        implementation "com.facebook.fresco:animated-webp:${frescoVersion}"
    }
}

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) {
    debugImplementation files(new File(["node", "--print", "require.resolve('hermes-engine/package.json')"].execute(null, rootDir).text.trim(), "../android/hermes-debug.aar"))
    releaseImplementation files(new File(["node", "--print", "require.resolve('hermes-engine/package.json')"].execute(null, rootDir).text.trim(), "../android/hermes-release.aar"))
} else {
    implementation jscFlavor
}}

if (isNewArchitectureEnabled()) {
configurations.all {
    resolutionStrategy.dependencySubstitution {
        substitute(module("com.facebook.react:react-native"))
                .using(project(":ReactAndroid")).because("On New Architecture we're building React Native from source")
    }
}}

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

apply from: new File(["node", "--print", "require.resolve('@react-native-community/cli-platform-android/package.json')"].execute(null, rootDir).text.trim(), "../native_modules.gradle");
applyNativeModulesAppBuildGradle(project)

def isNewArchitectureEnabled() {
return project.hasProperty("newArchEnabled") && project.newArchEnabled == "true"}

对于这些文件，我收到了 AbsolutePath() 错误和compileSDKVersion 未指定错误的错误。任何人都可以解释这个问题及其解决方案吗？错误如下：

FAILURE: Build completed with 2 failures.

1: Task failed with an exception.

-----------
* Where:
Build file '/Users/XXXX/Documents/baseappcode/android/app/build.gradle' line: 88

* What went wrong:
A problem occurred evaluating project ':app'.
> Cannot invoke method getAbsolutePath() on null object

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.
==============================================================================

2: Task failed with an exception.
-----------
* What went wrong:
A problem occurred configuring project ':app'.
> com.android.builder.errors.EvalIssueException: compileSdkVersion is not specified. Please add it to build.gradle

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.
==============================================================================

* Get more help at https://help.gradle.org

BUILD FAILED in 14s
5 actionable tasks: 5 up-to-date

看起来您升级了反应版本并错过了删除一些代码？你的project.ext.reactapp/build.gradle 中应该如下所示：

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

所有代码包括getAbsolutePath必须被删除。使用升级助手 https://react-native-community.github.io/upgrade-helper比较您的代码。