无法实例化应用程序 androidx.multidex.MultiDexApplication：java.lang.ClassNotFoundException
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【中文标题】无法实例化应用程序 androidx.multidex.MultiDexApplication：java.lang.ClassNotFoundException【英文标题】：Unable to instantiate application androidx.multidex.MultiDexApplication: java.lang.ClassNotFoundException 【发布时间】：2020-02-24 00:06:39 【问题描述】：我有一个 Ionic 3 应用程序。从最近几天开始，该应用程序编译成功，但在设备中打开之前崩溃。在模拟器上，它工作正常。
发生此错误：
java.lang.RuntimeException: Unable to instantiate application androidx.multidex.MultiDexApplication: java.lang.ClassNotFoundException: Didn't find class "androidx.multidex.MultiDexApplication" on path: DexPathList[[zip file "/data/app/com.hip.app-_pUW6ZegoL_8FtN7BFysGw==/base.apk"],nativeLibraryDirectories=[/data/app/com.hip.app-_pUW6ZegoL_8FtN7BFysGw==/lib/arm64, /system/lib64]]
at android.app.LoadedApk.makeApplication(LoadedApk.java:1073)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5992)
at android.app.ActivityThread.access$1200(ActivityThread.java:206)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1686)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:201)
at android.app.ActivityThread.main(ActivityThread.java:6882)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:873)
Caused by: java.lang.ClassNotFoundException: Didn't find class "androidx.multidex.MultiDexApplication" on path: DexPathList[[zip file "/data/app/com.hip.app-_pUW6ZegoL_8FtN7BFysGw==/base.apk"],nativeLibraryDirectories=[/data/app/com.hip.app-_pUW6ZegoL_8FtN7BFysGw==/lib/arm64, /system/lib64]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:171)
at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
at android.app.AppComponentFactory.instantiateApplication(AppComponentFactory.java:50)
at android.app.Instrumentation.newApplication(Instrumentation.java:1121)
at android.app.LoadedApk.makeApplication(LoadedApk.java:1065)
... 9 more
我的项目.properties
target=android-28
android.library.reference.1=CordovaLib
android.library.reference.2=app
cordova.system.library.1=androidx.annotation:annotation:1.0.0
cordova.gradle.include.1=branch-cordova-sdk/app-rules.gradle
cordova.gradle.include.2=cordova-plugin-firebase-lib/app-build.gradle
cordova.system.library.2=com.google.android.gms:play-services-tagmanager:16.+
cordova.system.library.3=com.google.firebase:firebase-auth:18.+
cordova.system.library.4=com.google.firebase:firebase-core:17.+
cordova.system.library.5=com.google.firebase:firebase-messaging:19.+
cordova.system.library.6=com.google.firebase:firebase-config:18.+
cordova.system.library.7=com.google.firebase:firebase-perf:18.+
和
我的 build.gradle
buildscript
repositories
google()
jcenter()
maven url 'https://maven.fabric.io/public' // Fabrics Maven repository from cordova-plugin-firebase-lib
dependencies
classpath 'com.android.tools.build:gradle:3.3.0'
classpath 'com.google.gms:google-services:4.2.0' // google-services dependency from cordova-plugin-firebase-lib
classpath 'io.fabric.tools:gradle:1.25.4' // fabric dependency from cordova-plugin-firebase-lib
allprojects
repositories
google()
jcenter()
google() // Google's Maven repository from cordova-plugin-firebase-lib
project.ext
defaultBuildToolsVersion="28.0.3"
defaultMinSdkVersion=21
defaultTargetSdkVersion=28
defaultCompileSdkVersion=28
（模块：app）app/build.gradle：
apply plugin: 'com.android.application'
buildscript
repositories
mavenCentral()
google()
jcenter()
dependencies
classpath 'com.android.tools.build:gradle:3.3.0'
// Allow plugins to declare Maven dependencies via build-extras.gradle.
allprojects
repositories
mavenCentral()
jcenter()
task wrapper(type: Wrapper)
gradleVersion = '4.10.3'
// Configuration properties. Set these via environment variables, build-extras.gradle, or gradle.properties.
// Refer to: http://www.gradle.org/docs/current/userguide/tutorial_this_and_that.html
ext
apply from: '../CordovaLib/cordova.gradle'
// The value for android.compileSdkVersion.
if (!project.hasProperty('cdvCompileSdkVersion'))
cdvCompileSdkVersion = null;
// The value for android.buildToolsVersion.
if (!project.hasProperty('cdvBuildToolsVersion'))
cdvBuildToolsVersion = null;
// Sets the versionCode to the given value.
if (!project.hasProperty('cdvVersionCode'))
cdvVersionCode = null
// Sets the minSdkVersion to the given value.
if (!project.hasProperty('cdvMinSdkVersion'))
cdvMinSdkVersion = null
// Whether to build architecture-specific APKs.
if (!project.hasProperty('cdvBuildMultipleApks'))
cdvBuildMultipleApks = null
// Whether to append a 0 "abi digit" to versionCode when only a single APK is build
if (!project.hasProperty('cdvVersionCodeForceAbiDigit'))
cdvVersionCodeForceAbiDigit = null
// .properties files to use for release signing.
if (!project.hasProperty('cdvReleaseSigningPropertiesFile'))
cdvReleaseSigningPropertiesFile = null
// .properties files to use for debug signing.
if (!project.hasProperty('cdvDebugSigningPropertiesFile'))
cdvDebugSigningPropertiesFile = null
// Set by build.js script.
if (!project.hasProperty('cdvBuildArch'))
cdvBuildArch = null
// Plugin gradle extensions can append to this to have code run at the end.
cdvPluginPostBuildExtras = []
// PLUGIN GRADLE EXTENSIONS START
apply from: "../branch-cordova-sdk/app-rules.gradle"
apply from: "../cordova-plugin-firebase-lib/app-build.gradle"
// PLUGIN GRADLE EXTENSIONS END
def hasBuildExtras1 = file('build-extras.gradle').exists()
if (hasBuildExtras1)
apply from: 'build-extras.gradle'
def hasBuildExtras2 = file('../build-extras.gradle').exists()
if (hasBuildExtras2)
apply from: '../build-extras.gradle'
// Set property defaults after extension .gradle files.
if (ext.cdvCompileSdkVersion == null)
ext.cdvCompileSdkVersion = privateHelpers.getProjectTarget()
//ext.cdvCompileSdkVersion = project.ext.defaultCompileSdkVersion
if (ext.cdvBuildToolsVersion == null)
ext.cdvBuildToolsVersion = privateHelpers.findLatestInstalledBuildTools()
//ext.cdvBuildToolsVersion = project.ext.defaultBuildToolsVersion
if (ext.cdvDebugSigningPropertiesFile == null && file('../debug-signing.properties').exists())
ext.cdvDebugSigningPropertiesFile = '../debug-signing.properties'
if (ext.cdvReleaseSigningPropertiesFile == null && file('../release-signing.properties').exists())
ext.cdvReleaseSigningPropertiesFile = '../release-signing.properties'
// Cast to appropriate types.
ext.cdvBuildMultipleApks = cdvBuildMultipleApks == null ? false : cdvBuildMultipleApks.toBoolean();
ext.cdvVersionCodeForceAbiDigit = cdvVersionCodeForceAbiDigit == null ? false : cdvVersionCodeForceAbiDigit.toBoolean();
ext.cdvMinSdkVersion = cdvMinSdkVersion == null ? defaultMinSdkVersion : Integer.parseInt('' + cdvMinSdkVersion)
ext.cdvVersionCode = cdvVersionCode == null ? null : Integer.parseInt('' + cdvVersionCode)
def computeBuildTargetName(debugBuild)
def ret = 'assemble'
if (cdvBuildMultipleApks && cdvBuildArch)
def arch = cdvBuildArch == 'arm' ? 'armv7' : cdvBuildArch
ret += '' + arch.toUpperCase().charAt(0) + arch.substring(1);
return ret + (debugBuild ? 'Debug' : 'Release')
// Make cdvBuild a task that depends on the debug/arch-sepecific task.
task cdvBuildDebug
cdvBuildDebug.dependsOn
return computeBuildTargetName(true)
task cdvBuildRelease
cdvBuildRelease.dependsOn
return computeBuildTargetName(false)
task cdvPrintProps
doLast
println('cdvCompileSdkVersion=' + cdvCompileSdkVersion)
println('cdvBuildToolsVersion=' + cdvBuildToolsVersion)
println('cdvVersionCode=' + cdvVersionCode)
println('cdvVersionCodeForceAbiDigit=' + cdvVersionCodeForceAbiDigit)
println('cdvMinSdkVersion=' + cdvMinSdkVersion)
println('cdvBuildMultipleApks=' + cdvBuildMultipleApks)
println('cdvReleaseSigningPropertiesFile=' + cdvReleaseSigningPropertiesFile)
println('cdvDebugSigningPropertiesFile=' + cdvDebugSigningPropertiesFile)
println('cdvBuildArch=' + cdvBuildArch)
println('computedVersionCode=' + android.defaultConfig.versionCode)
android.productFlavors.each flavor ->
println('computed' + flavor.name.capitalize() + 'VersionCode=' + flavor.versionCode)
android
defaultConfig
multiDexEnabled true
versionCode cdvVersionCode ?: new BigInteger("" + privateHelpers.extractIntFromManifest("versionCode"))
applicationId privateHelpers.extractStringFromManifest("package")
minSdkVersion 19
if (cdvMinSdkVersion != null)
minSdkVersion cdvMinSdkVersion
lintOptions
abortOnError false;
compileSdkVersion cdvCompileSdkVersion
buildToolsVersion cdvBuildToolsVersion
// This code exists for Crosswalk and other Native APIs.
// By default, we multiply the existing version code in the
// Android Manifest by 10 and add a number for each architecture.
// If you are not using Crosswalk or SQLite, you can
// ignore this chunk of code, and your version codes will be respected.
if (Boolean.valueOf(cdvBuildMultipleApks))
flavorDimensions "default"
productFlavors
armeabi
versionCode defaultConfig.versionCode*10 + 1
ndk
abiFilters = ["armeabi"]
armv7
versionCode defaultConfig.versionCode*10 + 2
ndk
abiFilters = ["armeabi-v7a"]
arm64
versionCode defaultConfig.versionCode*10 + 3
ndk
abiFilters = ["arm64-v8a"]
x86
versionCode defaultConfig.versionCode*10 + 4
ndk
abiFilters = ["x86"]
x86_64
versionCode defaultConfig.versionCode*10 + 5
ndk
abiFilters = ["x86_64"]
else if (Boolean.valueOf(cdvVersionCodeForceAbiDigit))
// This provides compatibility to the default logic for versionCode before cordova-android 5.2.0
defaultConfig
versionCode defaultConfig.versionCode*10
compileOptions
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
if (cdvReleaseSigningPropertiesFile)
signingConfigs
release
// These must be set or Gradle will complain (even if they are overridden).
keyAlias = ""
keyPassword = "__unset" // And these must be set to non-empty in order to have the signing step added to the task graph.
storeFile = null
storePassword = "__unset"
buildTypes
release
signingConfig signingConfigs.release
addSigningProps(cdvReleaseSigningPropertiesFile, signingConfigs.release)
if (cdvDebugSigningPropertiesFile)
addSigningProps(cdvDebugSigningPropertiesFile, signingConfigs.debug)
/*
* WARNING: Cordova Lib and platform scripts do management inside of this code here,
* if you are adding the dependencies manually, do so outside the comments, otherwise
* the Cordova tools will overwrite them
*/
dependencies
implementation fileTree(dir: 'libs', include: '*.jar')
// SUB-PROJECT DEPENDENCIES START
implementation(project(path: ":CordovaLib"))
implementation "androidx.annotation:annotation:1.0.0"
implementation "com.google.android.gms:play-services-tagmanager:16.+"
implementation "com.google.firebase:firebase-auth:18.+"
implementation "com.google.firebase:firebase-core:17.+"
implementation "com.google.firebase:firebase-messaging:19.+"
implementation "com.google.firebase:firebase-config:18.+"
implementation "com.google.firebase:firebase-perf:18.+"
// SUB-PROJECT DEPENDENCIES END
def promptForReleaseKeyPassword()
if (!cdvReleaseSigningPropertiesFile)
return;
if ('__unset'.equals(android.signingConfigs.release.storePassword))
android.signingConfigs.release.storePassword = privateHelpers.promptForPassword('Enter key store password: ')
if ('__unset'.equals(android.signingConfigs.release.keyPassword))
android.signingConfigs.release.keyPassword = privateHelpers.promptForPassword('Enter key password: ');
gradle.taskGraph.whenReady taskGraph ->
taskGraph.getAllTasks().each() task ->
if(['validateReleaseSigning', 'validateSigningRelease', 'validateSigningArmv7Release', 'validateSigningX76Release'].contains(task.name))
promptForReleaseKeyPassword()
def addSigningProps(propsFilePath, signingConfig)
def propsFile = file(propsFilePath)
def props = new Properties()
propsFile.withReader reader ->
props.load(reader)
def storeFile = new File(props.get('key.store') ?: privateHelpers.ensureValueExists(propsFilePath, props, 'storeFile'))
if (!storeFile.isAbsolute())
storeFile = RelativePath.parse(true, storeFile.toString()).getFile(propsFile.getParentFile())
if (!storeFile.exists())
throw new FileNotFoundException('Keystore file does not exist: ' + storeFile.getAbsolutePath())
signingConfig.keyAlias = props.get('key.alias') ?: privateHelpers.ensureValueExists(propsFilePath, props, 'keyAlias')
signingConfig.keyPassword = props.get('keyPassword', props.get('key.alias.password', signingConfig.keyPassword))
signingConfig.storeFile = storeFile
signingConfig.storePassword = props.get('storePassword', props.get('key.store.password', signingConfig.storePassword))
def storeType = props.get('storeType', props.get('key.store.type', ''))
if (!storeType)
def filename = storeFile.getName().toLowerCase();
if (filename.endsWith('.p12') || filename.endsWith('.pfx'))
storeType = 'pkcs12'
else
storeType = signingConfig.storeType // "jks"
signingConfig.storeType = storeType
for (def func : cdvPluginPostBuildExtras)
func()
// This can be defined within build-extras.gradle as:
// ext.postBuildExtras = ... code here ...
if (hasProperty('postBuildExtras'))
postBuildExtras()
我正在使用命令行来创建和签署构建，但我也尝试过：
在 android studio 中打开并同步项目
清理项目
重建项目
【问题讨论】：
对 ionic 了解不多，但是你有 app 级别的 gradle 属性吗？ build.gradle（模块：应用程序）？ @HaiderSaleem 是的，我有应用级 build.gradle（模块：app）。我已经更新了同样的问题。 可能会有所帮助***.com/questions/26763702/… 我试过了，构建的 Gradle 版本很旧。我正在使用更高版本的构建 Gradle。另外，我正在使用jetpack 版本，即androidx。图书馆。 【参考方案1】：我已通过从项目中删除 MultiDex 并将 minSdkVersion 升级到 21 解决了这个问题。
【讨论】：
这里有同样的问题。你能解释一下如何从项目中删除 MultiDex 吗？谢谢以上是关于无法实例化应用程序 androidx.multidex.MultiDexApplication：java.lang.ClassNotFoundException的主要内容，如果未能解决你的问题，请参考以下文章