メソッド数が65536より多いというエラーが来た場合

概要

エラー文としては以下のとおりである。

Error
 

Launching lib\main.dart on Pixel 7 in debug mode…
ERROR:D8: Cannot fit requested classes in a single dex file (# methods: 67052 > 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:100)
at org.gradle.workers.internal.NoIsolationWorkerFactory $1. l amb d a$ execute $0 (N o I so l a t i o nW or k er F a c t or y . j a v a : 62) a t or g . g r a d l e . w or k er s . in t er na l . A b s t r a c t W or k er$ 1.call(AbstractWorker.java:44)
at org.gradle.workers.internal.AbstractWorker $1. c a l l (A b s t r a c t W or k er . j a v a : 41) a t or g . g r a d l e . in t er na l . o p er a t i o n s . D e f a u l tB u i l d O p er a t i o n R u nn er$ CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:204)
at org.gradle.internal.operations.DefaultBuildOperationRunner $C a l l ab l e B u i l d O p er a t i o nW or k er . e x ec u t e (D e f a u l tB u i l d O p er a t i o n R u nn er . j a v a : 199) a t or g . g r a d l e . in t er na l . o p er a t i o n s . D e f a u l tB u i l d O p er a t i o n R u nn er$ 2.execute(DefaultBuildOperationRunner.java:66)
at org.gradle.internal.operations.DefaultBuildOperationRunner $2. e x ec u t e (D e f a u l tB u i l d O p er a t i o n R u nn er . j a v a : 59) a t or g . g r a d l e . in t er na l . o p er a t i o n s . D e f a u l tB u i l d O p er a t i o n R u nn er . e x ec u t e (D e f a u l tB u i l d O p er a t i o n R u nn er . j a v a : 157) a t or g . g r a d l e . in t er na l . o p er a t i o n s . D e f a u l tB u i l d O p er a t i o n R u nn er . e x ec u t e (D e f a u l tB u i l d O p er a t i o n R u nn er . j a v a : 59) a t or g . g r a d l e . in t er na l . o p er a t i o n s . D e f a u l tB u i l d O p er a t i o n R u nn er . c a l l (D e f a u l tB u i l d O p er a t i o n R u nn er . j a v a : 53) a t or g . g r a d l e . in t er na l . o p er a t i o n s . D e f a u l tB u i l d O p er a t i o n E x ec u t or . c a l l (D e f a u l tB u i l d O p er a t i o n E x ec u t or . j a v a : 73) a t or g . g r a d l e . w or k er s . in t er na l . A b s t r a c t W or k er . e x ec u t e W r a pp e d I n B u i l d O p er a t i o n (A b s t r a c t W or k er . j a v a : 41) a t or g . g r a d l e . w or k er s . in t er na l . N o I so l a t i o nW or k er F a c t or y$ 1.execute(NoIsolationWorkerFactory.java:59)
at org.gradle.workers.internal.DefaultWorkerExecutor.lambda $s u bmi t W or k$ 2(DefaultWorkerExecutor.java:205)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at org.gradle.internal.work.DefaultConditionalExecutionQueue $E x ec u t i o n R u nn er . r u n E x ec u t i o n (D e f a u l tC o n d i t i o na l E x ec u t i o n Q u e u e . j a v a : 187) a t or g . g r a d l e . in t er na l . w or k . D e f a u l tC o n d i t i o na l E x ec u t i o n Q u e u e$ ExecutionRunner.access $700 (D e f a u l tC o n d i t i o na l E x ec u t i o n Q u e u e . j a v a : 120) a t or g . g r a d l e . in t er na l . w or k . D e f a u l tC o n d i t i o na l E x ec u t i o n Q u e u e$ ExecutionRunner $1. r u n (D e f a u l tC o n d i t i o na l E x ec u t i o n Q u e u e . j a v a : 162) a t or g . g r a d l e . in t er na l . F a c t or i es$ 1.create(Factories.java:31)
at org.gradle.internal.work.DefaultWorkerLeaseService.withLocks(DefaultWorkerLeaseService.java:249)
at org.gradle.internal.work.DefaultWorkerLeaseService.runAsWorkerThread(DefaultWorkerLeaseService.java:109)
at org.gradle.internal.work.DefaultWorkerLeaseService.runAsWorkerThread(DefaultWorkerLeaseService.java:114)
at org.gradle.internal.work.DefaultConditionalExecutionQueue $E x ec u t i o n R u nn er . r u n B a t c h (D e f a u l tC o n d i t i o na l E x ec u t i o n Q u e u e . j a v a : 157) a t or g . g r a d l e . in t er na l . w or k . D e f a u l tC o n d i t i o na l E x ec u t i o n Q u e u e$ ExecutionRunner.run(DefaultConditionalExecutionQueue.java:126)
at java.base/java.util.concurrent.Executors $R u nnab l e A d a pt er . c a l l (E x ec u t or s . j a v a : 539) a t j a v a . ba se / j a v a . u t i l . co n c u r r e n t . F u t u r e T a s k . r u n (F u t u r e T a s k . j a v a : 264) a t or g . g r a d l e . in t er na l . co n c u r r e n t . E x ec u t or P o l i cy$ CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
at org.gradle.internal.concurrent.ManagedExecutorImpl $1. r u n (M ana g e d E x ec u t or I m pl . j a v a : 48) a t j a v a . ba se / j a v a . u t i l . co n c u r r e n t . T h r e a d P oo l E x ec u t or . r u nW or k er (T h r e a d P oo l E x ec u t or . j a v a : 1136) a t j a v a . ba se / j a v a . u t i l . co n c u r r e n t . T h r e a d P oo l E x ec u t or$ Worker.run(ThreadPoolExecutor.java:635)
at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: com.android.tools.r8.CompilationFailedException: Compilation failed to complete, position: null
at Version.fakeStackEntry(Version_3.3.70.java:0)
at com.android.tools.r8.internal.Fj.a(R8_3.3.70_49b71801b8b3de79ea68cec3bf950786c8f90f7a560cea4a2d23a82079b17d04:75)
at com.android.tools.r8.internal.Fj.a(R8_3.3.70_49b71801b8b3de79ea68cec3bf950786c8f90f7a560cea4a2d23a82079b17d04:28)
at com.android.tools.r8.internal.Fj.a(R8_3.3.70_49b71801b8b3de79ea68cec3bf950786c8f90f7a560cea4a2d23a82079b17d04:27)
at com.android.tools.r8.internal.Fj.b(R8_3.3.70_49b71801b8b3de79ea68cec3bf950786c8f90f7a560cea4a2d23a82079b17d04:2)
at com.android.tools.r8.D8.run(R8_3.3.70_49b71801b8b3de79ea68cec3bf950786c8f90f7a560cea4a2d23a82079b17d04:11)
at com.android.builder.dexing.D8DexArchiveMerger.mergeDexArchives(D8DexArchiveMerger.java:136)
… 38 more
Caused by: com.android.tools.r8.internal.f: Cannot fit requested classes in a single dex file (# methods: 67052 > 65536)
at com.android.tools.r8.internal.JT.a(R8_3.3.70_49b71801b8b3de79ea68cec3bf950786c8f90f7a560cea4a2d23a82079b17d04:14)
at com.android.tools.r8.internal.JT.a(R8_3.3.70_49b71801b8b3de79ea68cec3bf950786c8f90f7a560cea4a2d23a82079b17d04:22)
at com.android.tools.r8.internal.n30.a(R8_3.3.70_49b71801b8b3de79ea68cec3bf950786c8f90f7a560cea4a2d23a82079b17d04:524)
at com.android.tools.r8.internal.i30.a(R8_3.3.70_49b71801b8b3de79ea68cec3bf950786c8f90f7a560cea4a2d23a82079b17d04:7)
at com.android.tools.r8.internal.F2.a(R8_3.3.70_49b71801b8b3de79ea68cec3bf950786c8f90f7a560cea4a2d23a82079b17d04:371)
at com.android.tools.r8.internal.F2.a(R8_3.3.70_49b71801b8b3de79ea68cec3bf950786c8f90f7a560cea4a2d23a82079b17d04:455)
at com.android.tools.r8.D8.d(R8_3.3.70_49b71801b8b3de79ea68cec3bf950786c8f90f7a560cea4a2d23a82079b17d04:756)
at com.android.tools.r8.D8.b(R8_3.3.70_49b71801b8b3de79ea68cec3bf950786c8f90f7a560cea4a2d23a82079b17d04:1)
at com.android.tools.r8.internal.Fj.a(R8_3.3.70_49b71801b8b3de79ea68cec3bf950786c8f90f7a560cea4a2d23a82079b17d04:24)
… 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 26s
[!] 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
Exited (sigterm)

64K問題と呼ばれるもので、Android 界隈では有名な問題。
Android アプリに関しては、ビルドシステムの都合で参照できるメソッド数が 65536 個を超えるとビルドができなくなる制約のことを指す。

DEX ファイルというものは Android で実行可能なメソッド群ファイルで、本エラーログではその DEX ファイルには 67052 個（ > 65536 個）のメソッドがあるといわれている。

対処法

multiDexEnabled true を以下ディレクトリandroid/app/build.gradleに追加する。

//android/app/build.gradle
android { 
		
	: 
		
	defaultConfig {
		applicationId "com.example.xxxxxxxx" 
			
		: 
			
		multiDexEnabled true // これを追加 
	} 
		
	: 
		
}

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メソッド数が65536より多いというエラーが来た場合

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最終更新日：2025年12月16日13時2分

メソッド数が65536より多いというエラーが来た場合

概要

対処法

明示的な参考文献なし

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