React-native 构建失败：“无法创建任务 ':app:copyDownloadableDepsToLibs'”
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【中文标题】React-native 构建失败：“无法创建任务 \':app:copyDownloadableDepsToLibs\'”【英文标题】：React-native build fail: "Could not create task ':app:copyDownloadableDepsToLibs'"React-native 构建失败：“无法创建任务 ':app:copyDownloadableDepsToLibs'” 【发布时间】：2020-07-08 23:26:01 【问题描述】：我正在尝试在我的 USB 连接的 android 设备上运行我的 react 本机应用。昨天它工作得很好，但是今天，在没有任何改变的情况下，npx react-native run-android 命令失败并出现此错误（'.../android/app/build.gradle'）：
评估项目 ':app' 时出现问题。
无法创建任务“:app:copyDownloadableDepsToLibs”。
无法创建“复制”类型的任务。 org/gradle/api/internal/file/copy/DefaultCopySpec
我尝试cd android 然后./gradlew clean 也因同样的错误而失败。我试图删除构建文件夹，我也运行了npm install，但没有成功。
这是我的 ...android/app/build.gradle 文件：
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
* entryFile: "index.android.js",
*
* // https://facebook.github.io/react-native/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 = [
entryFile: "index.js",
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
compileSdkVersion rootProject.ext.compileSdkVersion
compileOptions
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
defaultConfig
applicationId "com.frontend"
minSdkVersion rootProject.ext.minSdkVersion
targetSdkVersion rootProject.ext.targetSdkVersion
versionCode 1
versionName "1.0"
missingDimensionStrategy 'react-native-camera', 'general'
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://facebook.github.io/react-native/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
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 project(':react-native-beacons-manager')
implementation fileTree(dir: "libs", include: ["*.jar"])
implementation "com.facebook.react:react-native:+" // From node_modules
implementation 'androidx.appcompat:appcompat:1.1.0-rc01'
implementation 'androidx.swiperefreshlayout:swiperefreshlayout:1.1.0-alpha02'
implementation 'androidx.localbroadcastmanager:localbroadcastmanager:1.0.0'
implementation project(':react-native-push-notification')
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)
// apply plugin: 'com.google.gms.google-services'
//googleServices disableVersionCheck = true
还有我的 package.json 文件：
"name": "frontend",
"version": "0.0.1",
"private": true,
"scripts":
"android": "react-native run-android",
"ios": "react-native run-ios",
"start": "react-native start",
"test": "jest",
"lint": "eslint . --ext .js,.jsx,.ts,.tsx"
,
"dependencies":
"@react-native-community/async-storage": "^1.8.1",
"@react-native-community/masked-view": "^0.1.7",
"@react-navigation/drawer": "^5.1.1",
"@react-navigation/native": "^5.0.9",
"@react-navigation/stack": "^5.2.3",
"moment": "^2.24.0",
"native-base": "^2.13.8",
"react": "16.9.0",
"react-native": "0.61.5",
"react-native-barcode-mask": "^1.1.0",
"react-native-beacons-manager": "github:MacKentoch/react-native-beacons-manager",
"react-native-bluetooth-status": "^1.4.2",
"react-native-camera": "^3.19.1",
"react-native-elements": "^1.2.7",
"react-native-gesture-handler": "^1.6.0",
"react-native-paper": "^3.6.0",
"react-native-push-notification": "^3.1.9",
"react-native-reanimated": "^1.7.0",
"react-native-safe-area-context": "^0.7.3",
"react-native-screens": "^2.2.0",
"react-navigation": "^4.2.2",
"react-navigation-drawer": "^2.4.2",
"react-navigation-stack": "^2.2.3"
,
"devDependencies":
"@babel/core": "^7.6.2",
"@babel/runtime": "^7.6.2",
"@react-native-community/eslint-config": "^0.0.5",
"@types/jest": "^24.0.24",
"@types/react-native": "^0.60.25",
"@types/react-test-renderer": "16.9.1",
"@typescript-eslint/eslint-plugin": "^2.12.0",
"@typescript-eslint/parser": "^2.12.0",
"babel-jest": "^24.9.0",
"eslint": "^6.5.1",
"jest": "^24.9.0",
"metro-react-native-babel-preset": "^0.56.0",
"react-test-renderer": "16.9.0",
"typescript": "^3.7.3"
,
"jest":
"preset": "react-native",
"moduleFileExtensions": ["ts", "tsx", "js", "jsx", "json", "node"]
【问题讨论】：
请尝试 cd android 和 ./gradlew build 我尝试过，但发生了同样的错误（./gradlew clean 也尝试构建项目） 【参考方案1】：mm 是的.. npx react-native run-android 在执行以下步骤后工作：
-
重新启动笔记本电脑（即使它刚刚通电）
cd android
./gradlew clean（重启后工作...）
似乎简单的旧方法值得偶尔尝试一下
【讨论】：
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