Androidの赤いエラー?

buildしたらエラー出た〜

FlutterでFirebaseを使っているときに、たまにbuildエラーが起きます😱
同じエラーで困っている方がいるかと思うので、メモを残しておきます。

エラー内容

こんなエラーが出る!
ちなみにこのエラーは、minSdkVersionが20以下でないと発生しないです😅
Android developersの公式ドキュメントの情報を記載

multidex 向けにアプリを構成する

minSdkVersionが21以上に設定されている場合は multidex がデフォルトで有効になり、multidex ライブラリは必要ありません。

一方、minSdkVersion が 20 以下に設定されている場合は、multidex ライブラリを使用し、アプリ プロジェクトに以下のような変更を加える必要があります。

次に示すように、モジュール レベルの build.gradle ファイルを編集して Multidex を有効にし、Multidex ライブラリを依存関係として追加します。

---

minSdkVersionが20以下だとこのようなエラーが発生します!
最近は21と23が多い気がするので、19にする人はあまりいないような?
最近のYouTubeの動画で、19に設定している人がいたので、真似したらエラー出しちゃいました😇

Launching lib/main.dart on sdk gphone64 x86 64 in debug mode...
Running Gradle task 'assembleDebug'...
ERROR:D8: Cannot fit requested classes in a single dex file (# methods: 91642 > 65536)
com.android.builder.dexing.DexArchiveMergerException: Error while merging dex archives: 
The number of method references in a .dex file cannot exceed 64K.
Learn how to resolve this issue at https://developer.android.com/tools/building/multidex.html
	at com.android.builder.dexing.D8DexArchiveMerger.getExceptionToRethrow(D8DexArchiveMerger.java:151)
	at com.android.builder.dexing.D8DexArchiveMerger.mergeDexArchives(D8DexArchiveMerger.java:138)
	at com.android.build.gradle.internal.tasks.DexMergingWorkAction.merge(DexMergingTask.kt:859)
	at com.android.build.gradle.internal.tasks.DexMergingWorkAction.run(DexMergingTask.kt:805)
	at com.android.build.gradle.internal.profile.ProfileAwareWorkAction.execute(ProfileAwareWorkAction.kt:74)
	at org.gradle.workers.internal.DefaultWorkerServer.execute(DefaultWorkerServer.java:63)
	at org.gradle.workers.internal.NoIsolationWorkerFactory$1$1.create(NoIsolationWorkerFactory.java:66)
	at org.gradle.workers.internal.NoIsolationWorkerFactory$1$1.create(NoIsolationWorkerFactory.java:62)
	at org.gradle.internal.classloader.ClassLoaderUtils.executeInClassloader(ClassLoaderUtils.java:97)
	at org.gradle.workers.internal.NoIsolationWorkerFactory$1.lambda$execute$0(NoIsolationWorkerFactory.java:62)
	at org.gradle.workers.internal.AbstractWorker$1.call(AbstractWorker.java:44)
	at org.gradle.workers.internal.AbstractWorker$1.call(AbstractWorker.java:41)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:204)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:199)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:66)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:59)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:157)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:59)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.call(DefaultBuildOperationRunner.java:53)
	at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:73)
	at org.gradle.workers.internal.AbstractWorker.executeWrappedInBuildOperation(AbstractWorker.java:41)
	at org.gradle.workers.internal.NoIsolationWorkerFactory$1.execute(NoIsolationWorkerFactory.java:59)
	at org.gradle.workers.internal.DefaultWorkerExecutor.lambda$submitWork$2(DefaultWorkerExecutor.java:205)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.runExecution(DefaultConditionalExecutionQueue.java:187)
	at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.access$700(DefaultConditionalExecutionQueue.java:120)
	at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner$1.run(DefaultConditionalExecutionQueue.java:162)
	at org.gradle.internal.Factories$1.create(Factories.java:31)
	at org.gradle.internal.work.DefaultWorkerLeaseService.withLocks(DefaultWorkerLeaseService.java:270)
	at org.gradle.internal.work.DefaultWorkerLeaseService.runAsWorkerThread(DefaultWorkerLeaseService.java:119)
	at org.gradle.internal.work.DefaultWorkerLeaseService.runAsWorkerThread(DefaultWorkerLeaseService.java:124)
	at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.runBatch(DefaultConditionalExecutionQueue.java:157)
	at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.run(DefaultConditionalExecutionQueue.java:126)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
	at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:48)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: com.android.tools.r8.CompilationFailedException: Compilation failed to complete, position: null
	at Version.fakeStackEntry(Version_3.1.66.java:0)
	at com.android.tools.r8.internal.pO0.a(SourceFile:68)
	at com.android.tools.r8.internal.pO0.a(SourceFile:28)
	at com.android.tools.r8.internal.pO0.a(SourceFile:27)
	at com.android.tools.r8.internal.pO0.b(SourceFile:3)
	at com.android.tools.r8.D8.run(D8.java:11)
	at com.android.builder.dexing.D8DexArchiveMerger.mergeDexArchives(D8DexArchiveMerger.java:136)
	... 38 more
Caused by: com.android.tools.r8.internal.b: Cannot fit requested classes in a single dex file (# methods: 91642 > 65536)
	at com.android.tools.r8.internal.jl1.a(SourceFile:14)
	at com.android.tools.r8.internal.jl1.a(SourceFile:22)
	at com.android.tools.r8.dex.T.a(SourceFile:58)
	at com.android.tools.r8.dex.O.a(SourceFile:7)
	at com.android.tools.r8.dex.e.a(SourceFile:14)
	at com.android.tools.r8.dex.e.c(SourceFile:36)
	at com.android.tools.r8.D8.d(D8.java:187)
	at com.android.tools.r8.D8.b(D8.java:1)
	at com.android.tools.r8.internal.pO0.a(SourceFile:24)
	... 41 more


FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:mergeExtDexDebug'.
> A failure occurred while executing com.android.build.gradle.internal.tasks.DexMergingTaskDelegate
   > There was a failure while executing work items
      > A failure occurred while executing com.android.build.gradle.internal.tasks.DexMergingWorkAction
         > com.android.builder.dexing.DexArchiveMergerException: Error while merging dex archives: 
           The number of method references in a .dex file cannot exceed 64K.
           Learn how to resolve this issue at https://developer.android.com/tools/building/multidex.html

* 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 19s
[!] App requires Multidex support
    Multidex support is required for your android app to build since the number of methods has exceeded 64k. See https://docs.flutter.dev/deployment/android#enabling-multidex-support for more information. You may pass the --no-multidex flag to skip Flutter's multidex support to use a manual solution.

    Flutter tool can add multidex support. The following file will be added by flutter:

        android/app/src/main/java/io/flutter/app/FlutterMultiDexApplication.java

cannot prompt without a terminal ui
Exception: Gradle task assembleDebug failed with exit code 1

対処方法

エラーログのこちらのリンクに行って、この設定を追加するとエラーを解消できました!
https://developer.android.com/studio/build/multidex

エラーの翻訳

ERROR:D8: 要求されたクラスを単一の dex ファイルに収められません (# methods: 91642 > 65536)
com.android.builder.dexing.DexArchiveMergerException: dex アーカイブのマージ中にエラーが発生しました。
.dex ファイル内のメソッド参照の数が 64K を超えることはできません。
この問題を解決する方法については、https://developer.android.com/tools/building/multidex.html を参照してください。

こちらのコードを追加する

android {
    defaultConfig {
        ...
        minSdkVersion 15
        targetSdkVersion 33
        multiDexEnabled true
    }
    ...
}

dependencies {
    implementation "androidx.multidex:multidex:2.0.1"
}

設定を追加したコード

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 = '1'
}

def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
    flutterVersionName = '1.0'
}

apply plugin: 'com.android.application'
// START: FlutterFire Configuration
apply plugin: 'com.google.gms.google-services'
// END: FlutterFire Configuration
apply plugin: 'kotlin-android'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"

android {
    compileSdkVersion 33
    ndkVersion flutter.ndkVersion

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    kotlinOptions {
        jvmTarget = '1.8'
    }

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

    defaultConfig {
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
        applicationId "com.example.freezed_app"
        // You can update the following values to match your application needs.
        // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-build-configuration.
        minSdkVersion 19
        targetSdkVersion 33
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
        multiDexEnabled true // 追加
    }

    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.debug
        }
    }
}

flutter {
    source '../..'
}

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation "androidx.multidex:multidex:2.0.1" // 追加
}

最後に

この記事が誰かのお役に立てると思い書きました。
他にもFlutterのアプリのVersion Upしたらgradleの設定を変更しないと対処できないエラーがあったりします。

アプリをアップデートしたときに過去に体験したFlutterFire関係のエラーを解消するのに、参考にしたリンク貼っておきます。
NativeのAndroidを開いて、設定をしないとアプリのupdate時のエラーは解消できないようです?
もし、Android studioでNativeのAndroidを開けなかったら、こちらのリンクが参考になりそうです

https://developer.android.com/studio/build/agp-upgrade-assistant?hl=ja
https://github.com/firebase/flutterfire/pull/8475
https://github.com/firebase/flutterfire/issues/8405

Android StudioでNativeの設定をしたら、こちらのファイルを修正する必要がありました!
Versionの調べ方は、簡単で新規プロジェクトを作ったらFlutter3.0.5だったらそれに対応したコードが書かれているので、合わせて設定すれば大丈夫です。

android/build.gradleのファイル

buildscript {
    ext.kotlin_version = '1.6.10'
    repositories {
        google()
        mavenCentral()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:7.1.2'
        // START: FlutterFire Configuration
        classpath 'com.google.gms:google-services:4.3.10'
        // END: FlutterFire Configuration
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

allprojects {
    repositories {
        google()
        mavenCentral()
    }
}

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

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