Flutter ClassNotFoundException (java.lang.RuntimeException) crash error

问题

Recently, I uploaded my Flutter app to Play Store. My app crashed after installing and opening the app. I've got several Crash Reports. I did researched everywhere about this error and found nothing, I even contacted Google Play's Support.

I am using Firebase Auth, cloud_firestore, google_sign_in... (check pubspec.yamll)

Help will be appreciated

Flutter Doctor:

Active code page: 1252
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, v1.17.3, on Active code page: 1252

Microsoft Windows [Version 10.0.18363.836], locale he-IL)

[√] Android toolchain - develop for Android devices (Android SDK version 29.0.0)
[√] Android Studio (version 3.6)
[!] IntelliJ IDEA Community Edition (version 2019.3)
    X Flutter plugin not installed; this adds Flutter specific functionality.
    X Dart plugin not installed; this adds Dart specific functionality.
[√] VS Code (version 1.45.1)
[√] Connected device (1 available)

! Doctor found issues in 1 category.

pubspec.yaml:

name: iusefully
description: Be more productive

# The following defines the version and build number for your application.
# A version number is three numbers separated by dots, like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in flutter
# build by specifying --build-name and --build-number, respectively.
# In Android, build-name is used as versionName while build-number used as versionCode.
# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
# In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
# Read more about iOS versioning at
# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
version: 2.0+1

module:
  androidX: true

environment:
  sdk: ">=2.5.2 <3.0.0"

dependencies:
  flutter:
    sdk: flutter

  google_sign_in: 4.5.1 
  firebase_auth: 0.16.1
  firebase_core: ^0.4.5
  firebase_analytics: ^5.0.14
  # cloud_firestore: ^0.13.0+1
  cloud_firestore: 0.13.6

  rxdart: 0.20.0
  cupertino_icons: ^0.1.2
  provider: ^4.0.4
  flutter_phoenix: "^0.1.0"
  animations: ^1.0.0+5
  curved_navigation_bar: ^0.3.2
  flutter_spinkit: "^4.1.2"



  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.

dev_dependencies:
  flutter_test:
    sdk: flutter


# For information on the generic Dart part of this file, see the
# following page: https://dart.dev/tools/pub/pubspec

# The following section is specific to Flutter.
flutter:

  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the material Icons class.
  uses-material-design: true

  # To add assets to your application, add an assets section, like this:
  # assets:
  #  - images/a_dot_burr.jpeg
  #  - images/a_dot_ham.jpeg
  assets:
    - images/google.png
    - images/login.png
    - images/human1.png
    - images/onboarding0.png
    - images/onboarding1.png
    - images/onboarding2.png

  # An image asset can refer to one or more resolution-specific "variants", see
  # https://flutter.dev/assets-and-images/#resolution-aware.

  # For details regarding adding assets from package dependencies, see
  # https://flutter.dev/assets-and-images/#from-packages

  # To add custom fonts to your application, add a fonts section here,
  # in this "flutter" section. Each entry in this list should have a
  # "family" key with the font family name, and a "fonts" key with a
  # list giving the asset and other descriptors for the font. For
  # example:
  # fonts:
  #   - family: Schyler
  #     fonts:
  #       - asset: fonts/Schyler-Regular.ttf
  #       - asset: fonts/Schyler-Italic.ttf
  #         style: italic
  #   - family: Trajan Pro
  #     fonts:
  #       - asset: fonts/TrajanPro.ttf
  #       - asset: fonts/TrajanPro_Bold.ttf
  #         weight: 700
  #
  fonts:
    - family: RobotoMono
      fonts:
        - asset: fonts/RobotoMono-Bold.ttf
    - family: NotoSans
      fonts:
        - asset: fonts/NotoSans-Regular.ttf

  # For details regarding fonts from package dependencies,
  # see https://flutter.dev/custom-fonts/#from-packages

app/build.gradle

def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
    localPropertiesFile.withReader('UTF-8') { reader ->
        localProperties.load(reader)
    }
}

def flutterRoot = localProperties.getProperty('flutter.sdk')
if (flutterRoot == null) {
    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
}

def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
    flutterVersionCode = '2.0+1'
}

def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
    flutterVersionName = '2.0'
}

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"

// def keystorePropertiesFile = rootProject.file("key.properties")
// def keystoreProperties = new Properties()
def keystoreProperties = new Properties()
def keystorePropertiesFile = rootProject.file('key.properties')
if (keystorePropertiesFile.exists()) {
    keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
}

android {
    compileSdkVersion 28

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

    lintOptions {
        disable 'InvalidPackage'
    }

    defaultConfig {
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
        applicationId "CLASSIFIED"
        minSdkVersion 23
        targetSdkVersion 28
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        multiDexEnabled true
        ndk {
            abiFilters 'x86', 'armeabi-v7a'
        }
    }

    signingConfigs {
       release {
           keyAlias keystoreProperties['keyAlias']
           keyPassword keystoreProperties['keyPassword']
           storeFile keystoreProperties['storeFile'] ? file(keystoreProperties['storeFile']) : null
           storePassword keystoreProperties['storePassword']
       }
    }

    buildTypes {
        release {
            // TODO: Add your own signing config for the release build.
            // Signing with the debug keys for now, so `flutter run --release` works.
            signingConfig signingConfigs.release
            minifyEnabled true
        }
    }
}

flutter {
    source '../..'
}

dependencies {
    implementation 'com.android.support:multidex:1.0.3'
    implementation 'android.arch.lifecycle:common-java8:1.1.0'

    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

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

build.gradle (root)

buildscript {
    ext.kotlin_version = '1.3.50'
    repositories {
        google()
        jcenter()
    }

    dependencies {
        //classpath 'com.android.tools.build:gradle:3.2.1' // 3.5.0
        classpath 'com.android.tools.build:gradle:3.4.2'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'com.google.gms:google-services:4.0.1'
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

rootProject.buildDir = '../build'
subprojects {
    project.buildDir = "${rootProject.buildDir}/${project.name}"
}
subprojects {
    project.evaluationDependsOn(':app')
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

• I have keystore (.jks) as well. But I think the problem isn't there.
• I am using app bundles

Thanks in advance :)

Crash Log (using master channel):

Launching lib\main.dart on Android SDK built for x86 in debug mode...                                                                                                                                                                                                D
Active code page: 1252
registerResGeneratingTask is deprecated, use registerGeneratedResFolders(FileCollection)
registerResGeneratingTask is deprecated, use registerGeneratedResFolders(FileCollection)
registerResGeneratingTask is deprecated, use registerGeneratedResFolders(FileCollection)
Active code page: 1252
Active code page: 1252
Note: D:\flutter\.pub-cache\hosted\pub.dartlang.org\cloud_firestore-0.13.6\android\src\main\java\io\flutter\plugins\firebase\cloudfirestore\CloudFirestorePlugin.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
Running Gradle task 'assembleDebug'...                                  
Running Gradle task 'assembleDebug'... Done                        41.9s
√ Built build\app\outputs\flutter-apk\app-debug.apk.
Installing build\app\outputs\flutter-apk\app.apk...                 2.6s
E/FlutterLoader( 6685): Flutter initialization failed.
E/FlutterLoader( 6685): java.util.concurrent.ExecutionException: java.lang.UnsatisfiedLinkError: dalvik.system.PathClassLoader[DexPathList[[zip file "/data/app/com.tomeruby.iusefully-0JfExLxHhUqLUimkj6h-1Q==/base.apk"],nativeLibraryDirectories=[/data/app/com.tomeruby.iusefully-0JfExLxHhUqLUimkj6h-1Q==/lib/x86, /system/lib, /vendor/lib]]] couldn't find "libflutter.so"
E/FlutterLoader( 6685):         at java.util.concurrent.FutureTask.report(FutureTask.java:123)
E/FlutterLoader( 6685):         at java.util.concurrent.FutureTask.get(FutureTask.java:193)
E/FlutterLoader( 6685):         at io.flutter.embedding.engine.loader.FlutterLoader.ensureInitializationComplete(FlutterLoader.java:193)
E/FlutterLoader( 6685):         at io.flutter.embedding.engine.FlutterEngine.<init>(FlutterEngine.java:207)
E/FlutterLoader( 6685):         at io.flutter.embedding.engine.FlutterEngine.<init>(FlutterEngine.java:188)
E/FlutterLoader( 6685):         at io.flutter.embedding.engine.FlutterEngine.<init>(FlutterEngine.java:154)
E/FlutterLoader( 6685):         at io.flutter.embedding.android.FlutterActivityAndFragmentDelegate.setupFlutterEngine(FlutterActivityAndFragmentDelegate.java:229)
E/FlutterLoader( 6685):         at io.flutter.embedding.android.FlutterActivityAndFragmentDelegate.onAttach(FlutterActivityAndFragmentDelegate.java:151)
E/FlutterLoader( 6685):         at io.flutter.embedding.android.FlutterActivity.onCreate(FlutterActivity.java:409)
E/FlutterLoader( 6685):         at android.app.Activity.performCreate(Activity.java:7009)
E/FlutterLoader( 6685):         at android.app.Activity.performCreate(Activity.java:7000)
E/FlutterLoader( 6685):         at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1214)
E/FlutterLoader( 6685):         at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2731)
E/FlutterLoader( 6685):         at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
E/FlutterLoader( 6685):         at android.app.ActivityThread.-wrap11(Unknown Source:0)
E/FlutterLoader( 6685):         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
E/FlutterLoader( 6685):         at android.os.Handler.dispatchMessage(Handler.java:106)
E/FlutterLoader( 6685):         at android.os.Looper.loop(Looper.java:164)
E/FlutterLoader( 6685):         at android.app.ActivityThread.main(ActivityThread.java:6494)
E/FlutterLoader( 6685):         at java.lang.reflect.Method.invoke(Native Method)
E/FlutterLoader( 6685):         at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
E/FlutterLoader( 6685):         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
E/FlutterLoader( 6685): Caused by: java.lang.UnsatisfiedLinkError: dalvik.system.PathClassLoader[DexPathList[[zip file "/data/app/com.tomeruby.iusefully-0JfExLxHhUqLUimkj6h-1Q==/base.apk"],nativeLibraryDirectories=[/data/app/com.tomeruby.iusefully-0JfExLxHhUqLUimkj6h-1Q==/lib/x86, /system/lib, /vendor/lib]]] couldn't find "libflutter.so"
E/FlutterLoader( 6685):         at java.lang.Runtime.loadLibrary0(Runtime.java:1011)
E/FlutterLoader( 6685):         at java.lang.System.loadLibrary(System.java:1657)
E/FlutterLoader( 6685):         at io.flutter.embedding.engine.loader.FlutterLoader$1.call(FlutterLoader.java:145)
E/FlutterLoader( 6685):         at io.flutter.embedding.engine.loader.FlutterLoader$1.call(FlutterLoader.java:140)
E/FlutterLoader( 6685):         at java.util.concurrent.FutureTask.run(FutureTask.java:266)
E/FlutterLoader( 6685):         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
E/FlutterLoader( 6685):         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
E/FlutterLoader( 6685):         at java.lang.Thread.run(Thread.java:764)

回答1:

ndk {
    abiFilters 'x86', 'x86_64', 'armeabi', 'armeabi-v7a', 'mips', 'mips64', 'arm64-v8a'
}

fixed it. Add the line to app/build.gradle

来源：https://stackoverflow.com/questions/62308701/flutter-classnotfoundexception-java-lang-runtimeexception-crash-error