无法解析 react-native-gesture-handler 中的符号 android.support.v4.util.Pools
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【中文标题】无法解析 react-native-gesture-handler 中的符号 android.support.v4.util.Pools【英文标题】：Can't resolve symbol android.support.v4.util.Pools in react-native-gesture-handler 【发布时间】：2019-09-27 21:48:48 【问题描述】：我正在做 react-native 项目。
通过运行“npm install”更新我的模块后，
我在“react-native-gesture-handler”的“android.support.v4.util”中找不到类“Pools”。
-
为什么会出现这个错误？
我该如何解决这个问题？
1.error（如果运行“react-native run-android”） -cmd
Task :react-native-gesture-handler:compileDebugJavaWithJavac FAILED
D:\weneepl\project_y-test2_t\project_y\node_modules\react-native-gesture-handler\android\src\main\java\com\swmansion\gesturehandler\react\RNGestureHandlerEvent.java:3: error: cannot find symbol
import android.support.v4.util.Pools;
^
symbol: class Pools
location: package android.support.v4.util
D:\weneepl\project_y-test2_t\project_y\node_modules\react-native-gesture-handler\android\src\main\java\com\swmansion\gesturehandler\react\RNGestureHandlerEvent.java:19: error: package Pools does not exist
private static final Pools.SynchronizedPool<RNGestureHandlerEvent> EVENTS_POOL =
^
D:\weneepl\project_y-test2_t\project_y\node_modules\react-native-gesture-handler\android\src\main\java\com\swmansion\gesturehandler\react\RNGestureHandlerStateChangeEvent.java:3: error: cannot find symbol
import android.support.v4.util.Pools;
^
symbol: class Pools
location: package android.support.v4.util
D:\weneepl\project_y-test2_t\project_y\node_modules\react-native-gesture-handler\android\src\main\java\com\swmansion\gesturehandler\react\RNGestureHandlerStateChangeEvent.java:18: error: package Pools does not exist
private static final Pools.SynchronizedPool<RNGestureHandlerStateChangeEvent> EVENTS_POOL =
^
D:\weneepl\project_y-test2_t\project_y\node_modules\react-native-gesture-handler\android\src\main\java\com\swmansion\gesturehandler\react\RNGestureHandlerEvent.java:20: error: package Pools does not exist
new Pools.SynchronizedPool<>(TOUCH_EVENTS_POOL_SIZE);
^
D:\weneepl\project_y-test2_t\project_y\node_modules\react-native-gesture-handler\android\src\main\java\com\swmansion\gesturehandler\react\RNGestureHandlerStateChangeEvent.java:19: error: package Pools does not exist
new Pools.SynchronizedPool<>(TOUCH_EVENTS_POOL_SIZE);
^
Note:D:\weneepl\project_y-test2_t\project_y\node_modules\react-native-gesture-handler\android\src\main\java\com\swmansion\gesturehandler\react\RNGestureHandlerButtonViewManager.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
6 errors
2.React Native 环境信息：
System:
OS: Windows 10
CPU: (4) x64 Intel(R) Core(TM) i5-7500 CPU @ 3.40GHz
Memory: 7.59 GB / 15.96 GB
Binaries:
Yarn: 1.15.2 - C:\Program Files (x86)\Yarn\bin\yarn.CMD
npm: 6.9.0 - C:\Program Files\nodejs\npm.CMD
IDEs:
Android Studio: Version 3.4.0.0 AI-183.5429.30.34.5452501
3.package.json
"name": "project_y",
"version": "0.0.1",
"private": true,
"scripts":
"start": "react-native run-android",
"gradle-clean": "cd android & gradlew clean",
"start-root": "react-native run-android --root",
"test": "jest",
"bundle": "react-native bundle --platform android --dev false --entry-file
index.js --bundle-output android/app/src/main/assets/index.android.bundle --assets-dest android/app/src/main/res/",
"build": "cd android & gradlew assembleDebug"
,
"dependencies":
"axios": "^0.18.0",
"moment": "^2.24.0",
"prop-types": "^15.7.2",
"react": "16.6.3",
"react-native": "0.58.5",
"react-native-android-open-settings": "^1.3.0",
"react-native-custom-checkbox": "^1.5.2",
"react-native-gesture-handler": "^1.0.16",
"react-native-grid-list": "^1.0.9",
"react-native-image-resizer": "^1.0.1",
"react-native-kakao-logins": "^1.3.6",
"react-native-linear-gradient": "^2.5.3",
"react-native-picker-select": "^6.0.0",
"react-native-shadow": "^1.2.2",
"react-native-super-grid": "^3.0.3",
"react-native-svg": "^9.2.4",
"react-native-vector-icons": "^6.3.0",
"react-native-webview": "^5.5.0",
"react-navigation": "^3.3.2",
"react-redux": "^6.0.1",
"redux": "^4.0.1"
,
"devDependencies":
"babel-core": "7.0.0-bridge.0",
"babel-jest": "24.1.0",
"jest": "24.1.0",
"metro-react-native-babel-preset": "0.52.0",
"react-test-renderer": "16.6.3",
"redux-devtools": "^3.5.0"
,
"jest":
"preset": "react-native"
,
"rnpm":
"assets": [
"./assets/fonts/",
"resources/fonts"
]
4.build.gradle(app/)
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
def enableProguardInReleaseBuilds = false
android
compileSdkVersion rootProject.ext.compileSdkVersion
buildToolsVersion rootProject.ext.buildToolsVersion
defaultConfig
applicationId "com.projecty.projecty"
minSdkVersion rootProject.ext.minSdkVersion
targetSdkVersion rootProject.ext.targetSdkVersion
versionCode 10
versionName "1.9"
splits
abi
reset()
enable enableSeparateBuildPerCPUArchitecture
universalApk false // If true, also generate a universal APK
include "armeabi-v7a", "x86", "arm64-v8a"
buildTypes
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]
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 'com.google.android.gms:play-services-base:12.0.0'
implementation 'com.android.installreferrer:installreferrer:1.0'
implementation 'com.igaworks.adbrix:abx-common-rm:+'
implementation project(':react-native-webview')
implementation project(':react-native-android-open-settings')
implementation project(':react-native-kakao-logins')
implementation project(':react-native-svg')
implementation project(':react-native-linear-gradient')
implementation project(':react-native-vector-icons')
implementation project(':react-native-gesture-handler')
implementation fileTree(dir: "libs", include: ["*.jar"])
implementation "com.android.support:appcompat-
v7:$rootProject.ext.supportLibVersion"
compile(name: 'IgawSSP_v2.0.6a', ext: 'aar')
repositories
flatDir
dirs 'libs'
implementation "com.facebook.react:react-native:+" // From node_modules
task copyDownloadableDepsToLibs(type: Copy)
from configurations.compile
into 'libs'
subprojects
repositories
mavenCentral()
maven url
'http://devrepo.kakao.com:8088/nexus/content/groups/public/'
5.build.gradle(android/)
buildscript
ext
buildToolsVersion = "28.0.2"
minSdkVersion = 16
compileSdkVersion = 28
targetSdkVersion = 28
supportLibVersion = "28.0.0"
repositories
google()
jcenter()
dependencies
classpath 'com.android.tools.build:gradle:3.3.2'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
allprojects
repositories
mavenLocal()
google()
jcenter()
flatDir
dirs 'libs'
maven
url 'https://dl.bintray.com/igaworks/AdbrixRmSDK'
maven
// All of React Native (JS, Obj-C sources, Android binaries) is installed from npm
url "$rootDir/../node_modules/react-native/android"
mavenCentral()
maven
url 'http://devrepo.kakao.com:8088/nexus/content/groups/public/'
task wrapper(type: Wrapper)
gradleVersion = '4.7'
distributionUrl = distributionUrl.replace("bin", "all")
我希望构建项目完成。
【问题讨论】：
【参考方案1】：我在使用 React Native 0.60.0 时遇到了同样的问题，以上答案都没有给我一个解决方案，所以我修复了这个：
npm i jetifier
npx jetify
jetifier 是一个 npm 格式的 AndroidX 过渡工具，具有 react-native 兼容风格。
如果您将 React Native 模块与非本地 Java 代码一起使用 转换为 AndroidX，并且您的应用是 AndroidX，您可能需要 这个
所以，在 RN 0.60 中，您需要 AndroidX
【讨论】：
在安装 react-navigation （及其所有依赖项）后，我在 0.60 时遇到了这个问题。这个解决方案解决了我的问题。 也为我工作。 RN0.60 不适合我现在正在抛出：package androidx.core.util does not exist【参考方案2】：
使用AndroidStudio3.3+打开项目
点击模块android[react-native-gesture-handler]
点击顶部重构 -> 迁移到 AndroidX
完成
【讨论】：
非常感谢您的回答！ 这可能对单个包有用，但对于需要在具有许多依赖项的 CI 环境中构建的项目没有帮助。 o 太好了，这应该是这个问题的正确答案。 @playSCforever 很好不要 如果您对circlec有问题怎么办？我无法应用此解决方案。 不想迁移到 androidx 上的我们怎么办【参考方案3】：在android studio中打开项目->在RNGestureHandler中浏览到指定文件
删除这个
import android.support.v4.util.Pools;
然后添加这个
import androidx.core.util.Pools;
【讨论】：
【参考方案4】：类似的事情也发生在我身上。我在https://developer.android.com/reference/android/support/v4/util/Pools查看了android文档
转到 android/build.gradle
在依赖项部分添加classpath "com.android.support:support-compat:28.0.0-alpha1"
这是我第一次写关于堆栈溢出的答案，我希望它的答案格式很好。
【讨论】：
非常适合第一个答案！我只是添加了一些格式以提高可读性【参考方案5】：请从gradle.properties中删除这两行
android.useAndroidX=true
android.enableJetifier=true
【讨论】：
此解决方案有效。我添加了它并修复了从 androidx 导入。谢谢 此解决方案在 app/build.gradle 中添加 multidex true 后有效。 Multidex 添加参考 - ***.com/questions/52264534/…【参考方案6】：没有什么对我有用，但这有效。
在gradle.properties中创建enableJetifier=false
android.useAndroidX=true
android.enableJetifier=false
【讨论】：
我还将android.useAndroidX 设置为false，它对我有用【参考方案7】：
我也面临同样的问题。只需确保您已更新 react-native-gesture-handler 的版本即可。如果你这样做，那么它应该工作。对我来说，它是这样工作的。
【讨论】：
【参考方案8】：在gradle.properties中进行更改
android.useAndroidX=true
android.enableJetifier=true
npm install --save-dev jetifier
或
npm install jetifier
npx jetify
npx react-native run-android
在你的 package.json 的 postinstall 目标中调用 npx jetify run （任何时候你的依赖更新你必须再次jetify）
【讨论】：
【参考方案9】：要使其正常工作，只需通过添加以下两行来编辑 android>gradle.properties 文件：
android.useAndroidX=true
android.enableJetifier=true
【讨论】：
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