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Dynamic Deliveryで `resource integer/google_play_services_version not found.` が出る時の対処

AndroidのDynamic Feature Moduleで開発をする際、下記のようなエラーが出る時がある:

Android resource linking failed
/Users/***/***/app/build/intermediates/merged_manifests/debug/AndroidManifest.xml:***: error: resource integer/google_play_services_version (aka ***:integer/google_play_services_version) not found.
error: failed processing manifest.

詳細を開くと、下記のようになっている:

org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:processDebugResources'.
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:95)
    at org.gradle.api.internal.tasks.execution.ResolveTaskOutputCachingStateExecuter.execute(ResolveTaskOutputCachingStateExecuter.java:91)
    at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:57)
    at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:119)
    at org.gradle.api.internal.tasks.execution.ResolvePreviousStateExecuter.execute(ResolvePreviousStateExecuter.java:43)
    at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:93)
    at org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute(FinalizePropertiesTaskExecuter.java:45)
    at org.gradle.api.internal.tasks.execution.ResolveTaskArtifactStateTaskExecuter.execute(ResolveTaskArtifactStateTaskExecuter.java:94)
    at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:56)
    at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:55)
    at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:36)
    at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.executeTask(EventFiringTaskExecuter.java:67)
    at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:52)
    at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:49)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:315)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:305)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:175)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:101)
    at org.gradle.internal.operations.DelegatingBuildOperationExecutor.call(DelegatingBuildOperationExecutor.java:36)
    at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.execute(EventFiringTaskExecuter.java:49)
    at org.gradle.execution.plan.LocalTaskNodeExecutor.execute(LocalTaskNodeExecutor.java:43)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:355)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:343)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:336)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:322)
    at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker$1.execute(DefaultPlanExecutor.java:134)
    at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker$1.execute(DefaultPlanExecutor.java:129)
    at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.execute(DefaultPlanExecutor.java:202)
    at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.executeNextNode(DefaultPlanExecutor.java:193)
    at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.run(DefaultPlanExecutor.java:129)
    at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:63)
    at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:46)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55)
    at java.lang.Thread.run(Thread.java:745)
Caused by: com.android.builder.internal.aapt.v2.Aapt2Exception: Android resource linking failed
/Users/***/***/app/build/intermediates/merged_manifests/debug/AndroidManifest.xml:***: AAPT: error: resource integer/google_play_services_version (aka ***:integer/google_play_services_version) not found.
    
error: failed processing manifest.
    at com.android.builder.internal.aapt.v2.Aapt2Exception$Companion.create(Aapt2Exception.kt:45)
    at com.android.builder.internal.aapt.v2.Aapt2Exception$Companion.create$default(Aapt2Exception.kt:39)
    at com.android.build.gradle.internal.res.Aapt2ErrorUtils.rewriteException(Aapt2ErrorUtils.kt:97)
    at com.android.build.gradle.internal.res.Aapt2ErrorUtils.rewriteLinkException(Aapt2ErrorUtils.kt:73)
    at com.android.build.gradle.internal.res.LinkApplicationAndroidResourcesTask$AaptSplitInvoker.invokeAaptForSplit(LinkApplicationAndroidResourcesTask.kt:808)
    at com.android.build.gradle.internal.res.LinkApplicationAndroidResourcesTask$AaptSplitInvoker.run(LinkApplicationAndroidResourcesTask.kt:669)
    at com.android.build.gradle.internal.res.LinkApplicationAndroidResourcesTask.doFullTaskAction(LinkApplicationAndroidResourcesTask.kt:262)
    at com.android.build.gradle.internal.tasks.IncrementalTask.taskAction(IncrementalTask.java:106)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:73)
    at org.gradle.api.internal.project.taskfactory.IncrementalTaskAction.doExecute(IncrementalTaskAction.java:47)
    at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:41)
    at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:28)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$2.run(ExecuteActionsTaskExecuter.java:284)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:301)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:293)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:175)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:91)
    at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:273)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:258)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.access$200(ExecuteActionsTaskExecuter.java:67)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$TaskExecution.execute(ExecuteActionsTaskExecuter.java:145)
    at org.gradle.internal.execution.impl.steps.ExecuteStep.execute(ExecuteStep.java:49)
    at org.gradle.internal.execution.impl.steps.CancelExecutionStep.execute(CancelExecutionStep.java:34)
    at org.gradle.internal.execution.impl.steps.TimeoutStep.executeWithoutTimeout(TimeoutStep.java:69)
    at org.gradle.internal.execution.impl.steps.TimeoutStep.execute(TimeoutStep.java:49)
    at org.gradle.internal.execution.impl.steps.CatchExceptionStep.execute(CatchExceptionStep.java:33)
    at org.gradle.internal.execution.impl.steps.CreateOutputsStep.execute(CreateOutputsStep.java:50)
    at org.gradle.internal.execution.impl.steps.SnapshotOutputStep.execute(SnapshotOutputStep.java:43)
    at org.gradle.internal.execution.impl.steps.SnapshotOutputStep.execute(SnapshotOutputStep.java:29)
    at org.gradle.internal.execution.impl.steps.CacheStep.executeWithoutCache(CacheStep.java:134)
    at org.gradle.internal.execution.impl.steps.CacheStep.lambda$execute$3(CacheStep.java:83)
    at java.util.Optional.orElseGet(Optional.java:267)
    at org.gradle.internal.execution.impl.steps.CacheStep.execute(CacheStep.java:82)
    at org.gradle.internal.execution.impl.steps.CacheStep.execute(CacheStep.java:36)
    at org.gradle.internal.execution.impl.steps.PrepareCachingStep.execute(PrepareCachingStep.java:33)
    at org.gradle.internal.execution.impl.steps.StoreSnapshotsStep.execute(StoreSnapshotsStep.java:38)
    at org.gradle.internal.execution.impl.steps.StoreSnapshotsStep.execute(StoreSnapshotsStep.java:23)
    at org.gradle.internal.execution.impl.steps.SkipUpToDateStep.executeBecause(SkipUpToDateStep.java:96)
    at org.gradle.internal.execution.impl.steps.SkipUpToDateStep.lambda$execute$1(SkipUpToDateStep.java:91)
    at java.util.Optional.orElseGet(Optional.java:267)
    at org.gradle.internal.execution.impl.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:91)
    at org.gradle.internal.execution.impl.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:36)
    at org.gradle.internal.execution.impl.DefaultWorkExecutor.execute(DefaultWorkExecutor.java:34)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:91)
    ... 35 more
Caused by: com.android.builder.internal.aapt.v2.Aapt2Exception: Android resource linking failed
/Users/***/***/app/build/intermediates/merged_manifests/debug/AndroidManifest.xml:***: error: resource integer/google_play_services_version (aka ***:integer/google_play_services_version) not found.
error: failed processing manifest.

    at com.android.builder.internal.aapt.v2.Aapt2Exception$Companion.create(Aapt2Exception.kt:45)
    at com.android.builder.internal.aapt.v2.Aapt2Exception$Companion.create$default(Aapt2Exception.kt:39)
    at com.android.builder.internal.aapt.v2.Aapt2DaemonImpl.doLink(Aapt2DaemonImpl.kt:191)
    at com.android.builder.internal.aapt.v2.Aapt2Daemon.link(Aapt2Daemon.kt:103)
    at com.android.builder.internal.aapt.v2.Aapt2DaemonManager$LeasedAaptDaemon.link(Aapt2DaemonManager.kt:176)
    at com.android.builder.core.AndroidBuilder.processResources(AndroidBuilder.java:858)
    at com.android.build.gradle.internal.res.LinkApplicationAndroidResourcesTask$AaptSplitInvoker.invokeAaptForSplit(LinkApplicationAndroidResourcesTask.kt:797)
    ... 79 more

原因

これはAndroidアプリのManifestに本来設定されるべきGoogle Play Servicesのバージョン番号メタデータが付与されていないことによるエラーである。
シングルモジュールでの一般的なAndroidアプリ開発では、必要とされるシーンでは自動的に設定される値である。というのも、play-services-basement内に含まれるManifestの内容がManifest Mergerによって自動的に設定されるからだ。

対してDynamic Feature Moduleを用いたマルチモジュール構成では Base APK (多くの場合 :app モジュール) がいわば単一のアプリのように振る舞うため、ビルド時点で必要な値であるにも関わらず アプリに値が含まれないことになってしまう。

たとえば今回 広告系のSDKを新たに導入しようとして発生したのなら、下記のような構成にしているのではないだろうか。

/app/build.gradle:

dependencies {
    ...
    api "com.google.android.play:core:1.6.1"
    ...
}

/feature/build.gradle:

dependencies {
    ...
    implementation 'com.google.android.gms:play-services-ads:18.1.1'
    ...
}

対処

当該の値を追加するモジュールのみ、Base Moduleに含んでしまえばよい。

/app/build.gradle:

dependencies {
    ...
    api "com.google.android.play:core:1.6.1"
    api 'com.google.android.gms:play-services-basement:17.1.0'
    ...
}

/feature/build.gradle:

dependencies {
    ...
    implementation 'com.google.android.gms:play-services-ads:18.1.1'
    ...
}