我已按照 https://reactnative.dev/docs/environment-setup 中指定的说明进行操作，但 choclatey 除外，因为我已经有了节点等。但是我无法构建我的应用程序以到达模拟器上的输出 RN 样板（第 2 步：在文档中）遵循 npx react-native run-android。我已经搜索了很多小时来解决问题，但我一无所获，而且变得非常令人沮丧。下面我附上了相关的输出。
预先感谢您的帮助。我只是刚开始，所以如果我需要提出更多问题以完全理解这个问题，请原谅我。
D:\CDLearn\ReactNative\AirBnb>npx react-native run-android
info Running jetifier to migrate libraries to AndroidX. You can disable it using "--no-jetifier" flag.
Jetifier found 903 file(s) to forward-jetify. Using 8 workers...
info Starting JS server...
info Launching emulator...
info Successfully launched emulator.
info Installing the app...
> Task :app:processDebugMainManifest FAILED
11 actionable tasks: 11 executed
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:processDebugMainManifest'.
> Unable to make field private final java.lang.String java.io.File.path accessible: module java.base does not "opens java.io" to unnamed module @379b3356
* 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 8s
error Failed to install the app. Make sure you have the Android development environment set up: https://reactnative.dev/docs/environment-setup.
Error: Command failed: gradlew.bat app:installDebug -PreactNativeDevServerPort=8081
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:processDebugMainManifest'.
> Unable to make field private final java.lang.String java.io.File.path accessible: module java.base does not "opens java.io" to unnamed module @379b3356
* 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 8s
at makeError (D:\CDLearn\ReactNative\AirBnb\node_modules\execa\index.js:174:9)
at D:\CDLearn\ReactNative\AirBnb\node_modules\execa\index.js:278:16
at processTicksAndRejections (internal/process/task_queues.js:93:5)
at async runOnAllDevices (D:\CDLearn\ReactNative\AirBnb\node_modules\@react-native-community\cli-platform-android\build\commands\runAndroid\runOnAllDevices.js:94:5)
at async Command.handleAction (D:\CDLearn\ReactNative\AirBnb\node_modules\react-native\node_modules\@react-native-community\cli\build\index.js:186:9)
info Run CLI with --verbose flag for more details.
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
ext {
buildToolsVersion = "29.0.3"
minSdkVersion = 21
compileSdkVersion = 29
targetSdkVersion = 29
ndkVersion = "20.1.5948944"
}
repositories {
google()
jcenter()
}
dependencies {
classpath("com.android.tools.build:gradle:4.1.0")
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
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://www.jitpack.io' }
}
}
apply plugin: "com.android.application"
import com.android.build.OutputFile
/**
* The react.gradle file registers a task for each build variant (e.g. bundleDebugJsAndAssets
* and bundleReleaseJsAndAssets).
* These basically call `react-native bundle` with the correct arguments during the Android build
* cycle. By default, bundleDebugJsAndAssets is skipped, as in debug/dev mode we prefer to load the
* bundle directly from the development server. Below you can see all the possible configurations
* and their defaults. If you decide to add a configuration block, make sure to add it before the
* `apply from: "../../node_modules/react-native/react.gradle"` line.
*
* project.ext.react = [
* // the name of the generated asset file containing your JS bundle
* bundleAssetName: "index.android.bundle",
*
* // the entry file for bundle generation. If none specified and
* // "index.android.js" exists, it will be used. Otherwise "index.js" is
* // default. Can be overridden with ENTRY_FILE environment variable.
* entryFile: "index.android.js",
*
* // https://reactnative.dev/docs/performance#enable-the-ram-format
* bundleCommand: "ram-bundle",
*
* // whether to bundle JS and assets in debug mode
* bundleInDebug: false,
*
* // whether to bundle JS and assets in release mode
* bundleInRelease: true,
*
* // whether to bundle JS and assets in another build variant (if configured).
* // See http://tools.android.com/tech-docs/new-build-system/user-guide#TOC-Build-Variants
* // The configuration property can be in the following formats
* // 'bundleIn${productFlavor}${buildType}'
* // 'bundleIn${buildType}'
* // bundleInFreeDebug: true,
* // bundleInPaidRelease: true,
* // bundleInBeta: true,
*
* // whether to disable dev mode in custom build variants (by default only disabled in release)
* // for example: to disable dev mode in the staging build type (if configured)
* devDisabledInStaging: true,
* // The configuration property can be in the following formats
* // 'devDisabledIn${productFlavor}${buildType}'
* // 'devDisabledIn${buildType}'
*
* // the root of your project, i.e. where "package.json" lives
* root: "../../",
*
* // where to put the JS bundle asset in debug mode
* jsBundleDirDebug: "$buildDir/intermediates/assets/debug",
*
* // where to put the JS bundle asset in release mode
* jsBundleDirRelease: "$buildDir/intermediates/assets/release",
*
* // where to put drawable resources / React Native assets, e.g. the ones you use via
* // require('./image.png')), in debug mode
* resourcesDirDebug: "$buildDir/intermediates/res/merged/debug",
*
* // where to put drawable resources / React Native assets, e.g. the ones you use via
* // require('./image.png')), in release mode
* resourcesDirRelease: "$buildDir/intermediates/res/merged/release",
*
* // by default the gradle tasks are skipped if none of the JS files or assets change; this means
* // that we don't look at files in android/ or ios/ to determine whether the tasks are up to
* // date; if you have any other folders that you want to ignore for performance reasons (gradle
* // indexes the entire tree), add them here. Alternatively, if you have JS files in android/
* // for example, you might want to remove it from here.
* inputExcludes: ["android/**", "ios/**"],
*
* // override which node gets called and with what additional arguments
* nodeExecutableAndArgs: ["node"],
*
* // supply additional arguments to the packager
* extraPackagerArgs: []
* ]
*/
project.ext.react = [
enableHermes: false, // clean and rebuild if changing
]
apply from: "../../node_modules/react-native/react.gradle"
/**
* Set this to true to create two separate APKs instead of one:
* - An APK that only works on ARM devices
* - An APK that only works on x86 devices
* The advantage is the size of the APK is reduced by about 4MB.
* Upload all the APKs to the Play Store and people will download
* the correct one based on the CPU architecture of their device.
*/
def enableSeparateBuildPerCPUArchitecture = false
/**
* Run Proguard to shrink the Java bytecode in release builds.
*/
def enableProguardInReleaseBuilds = false
/**
* The preferred build flavor of JavaScriptCore.
*
* For example, to use the international variant, you can use:
* `def jscFlavor = 'org.webkit:android-jsc-intl:+'`
*
* The international variant includes ICU i18n library and necessary data
* allowing to use e.g. `Date.toLocaleString` and `String.localeCompare` that
* give correct results when using with locales other than en-US. Note that
* this variant is about 6MiB larger per architecture than default.
*/
def jscFlavor = 'org.webkit:android-jsc:+'
/**
* Whether to enable the Hermes VM.
*
* This should be set on project.ext.react and mirrored here. If it is not set
* on project.ext.react, JavaScript will not be compiled to Hermes Bytecode
* and the benefits of using Hermes will therefore be sharply reduced.
*/
def enableHermes = project.ext.react.get("enableHermes", false);
android {
ndkVersion rootProject.ext.ndkVersion
compileSdkVersion rootProject.ext.compileSdkVersion
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
defaultConfig {
applicationId "com.airbnb"
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 {
// Caution! In production, you need to generate your own keystore file.
// see https://reactnative.dev/docs/signed-apk-android.
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
// Example: versionCode 1 will generate 1001 for armeabi-v7a, 1002 for x86, etc.
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 =
defaultConfig.versionCode * 1000 + versionCodes.get(abi)
}
}
}
}
dependencies {
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
}
}
// 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)
答案 0 :(得分：15)
我认为您已将 Java 更新到版本 16。请将 Java 降级到版本 <= 15。这帮助我解决了这个错误。
答案 1 :(得分：9)
今天在 Mac 上遇到了同样的问题，如前所述，降级到 Java 15。
我已经使用 proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
安装了 java，今天我决定升级我安装的应用程序...它自动更新到 java 16 并破坏了 React Native 构建。
这就是我对 brew 所做的：
brew install --cask adoptopenjdk仅供参考，这是我安装和工作的版本：
brew uninstall adoptopenjdk
brew install --cask adoptopenjdk/openjdk/adoptopenjdk15
答案 2 :(得分：6)
对于您的问题，就像其他人已经告诉您的那样，正确的解决方案是将您的 JDK 降级到 15 或更少。
您不需要取消它，您可以简单地决定切换它。
在终端输入 /usr/libexec/java_home -V 以检查您当前的 Java 版本
如果您没有找到合适的（在本例中为 <=15），您可以从这里的官方网站下载：https://www.oracle.com/java/technologies/javase-downloads.html
然后在你的终端（在你的项目中也可以）你应该输入
export JAVA_HOME=`/usr/libexec/java_home -v 15.0.2` （或您的正确版本！）
使用：java -version命令检查您使用的版本是否正确，如果是，您应该能够在 android 模拟器上运行！
要将此 JDK 版本设为默认版本，您可以通过在终端中键入来更改 bash 文件配置文件
open ~/.bash_profile
然后添加
# SWITCH TO JAVA VERSION 15.0.2
export JAVA_HOME=`/usr/libexec/java_home -v 15.0.2
答案 3 :(得分：3)
这是 JDK 16 的问题，请将您的 JDK 降级到较低版本，并在 vi ~./bash 配置文件中设置相同的 JAVA_HOME 路径
答案 4 :(得分：3)
我遇到了同样的问题（JDK 16）并使用以下方法修复了它：
boxplot(PM2.5~year,data=filtered_data)
答案 5 :(得分：0)
在命令行中试试这个命令
cd android && gradlew clean 然后cd .. react-native run-android