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我正在使用 android 插件 3.4.2，gradle 5.0。我在 gradle.properties 中关闭了 R8android.enableR8 = false

但是我仍然有一个堆栈跟踪，其中 R8 在包中。

这是否意味着 R8 仍然可以工作，或者它只是 r8 包中的 dexer？我知道如何修复此错误，但我想确定 R8 未启用。

D8: Cannot fit requested classes in the main-dex file (# methods: 65566 > 65536)

java.lang.RuntimeException: java.lang.RuntimeException: com.android.builder.dexing.DexArchiveMergerException: Error while merging dex archives: 
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
        at java.util.concurrent.ForkJoinTask.getThrowableException(ForkJoinTask.java:593)
        at java.util.concurrent.ForkJoinTask.reportException(ForkJoinTask.java:677)
        at java.util.concurrent.ForkJoinTask.join(ForkJoinTask.java:720)
        at com.google.common.collect.ImmutableList.forEach(ImmutableList.java:407)
        at com.android.build.gradle.internal.transforms.DexMergerTransform.transform(DexMergerTransform.java:244)
        at com.android.build.gradle.internal.pipeline.TransformTask$2.call(TransformTask.java:239)
        at com.android.build.gradle.internal.pipeline.TransformTask$2.call(TransformTask.java:235)
        at com.android.builder.profile.ThreadRecorder.record(ThreadRecorder.java:102)
        at com.android.build.gradle.internal.pipeline.TransformTask.transform(TransformTask.java:230)
        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:103)
        at org.gradle.api.internal.project.taskfactory.IncrementalTaskInputsTaskAction.doExecute(IncrementalTaskInputsTaskAction.java:46)
        at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:41)
        at org.gradle.api.internal.project.taskfactory.AbstractIncrementalTaskAction.execute(AbstractIncrementalTaskAction.java:25)
        at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:28)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$5.run(ExecuteActionsTaskExecuter.java:401)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:402)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:394)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:165)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:250)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:158)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:92)
        at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:390)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:373)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.access$200(ExecuteActionsTaskExecuter.java:79)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$TaskExecution.execute(ExecuteActionsTaskExecuter.java:210)
        at org.gradle.internal.execution.steps.ExecuteStep.lambda$execute$0(ExecuteStep.java:32)
        at java.util.Optional.map(Optional.java:215)
        at org.gradle.internal.execution.steps.ExecuteStep.execute(ExecuteStep.java:32)
        at org.gradle.internal.execution.steps.ExecuteStep.execute(ExecuteStep.java:26)
        at org.gradle.internal.execution.steps.CleanupOutputsStep.execute(CleanupOutputsStep.java:58)
        at org.gradle.internal.execution.steps.CleanupOutputsStep.execute(CleanupOutputsStep.java:35)
        at org.gradle.internal.execution.steps.ResolveInputChangesStep.execute(ResolveInputChangesStep.java:48)
        at org.gradle.internal.execution.steps.ResolveInputChangesStep.execute(ResolveInputChangesStep.java:33)
        at org.gradle.internal.execution.steps.CancelExecutionStep.execute(CancelExecutionStep.java:39)
        at org.gradle.internal.execution.steps.TimeoutStep.executeWithoutTimeout(TimeoutStep.java:73)
        at org.gradle.internal.execution.steps.TimeoutStep.execute(TimeoutStep.java:54)
        at org.gradle.internal.execution.steps.CatchExceptionStep.execute(CatchExceptionStep.java:35)
        at org.gradle.internal.execution.steps.CreateOutputsStep.execute(CreateOutputsStep.java:51)
        at org.gradle.internal.execution.steps.SnapshotOutputsStep.execute(SnapshotOutputsStep.java:45)
        at org.gradle.internal.execution.steps.SnapshotOutputsStep.execute(SnapshotOutputsStep.java:31)
        at org.gradle.internal.execution.steps.CacheStep.executeWithoutCache(CacheStep.java:201)
        at org.gradle.internal.execution.steps.CacheStep.executeAndStoreInCache(CacheStep.java:183)
        at org.gradle.internal.execution.steps.CacheStep.lambda$executeWithCache$2(CacheStep.java:106)
        at java.util.Optional.orElseGet(Optional.java:267)
        at org.gradle.internal.execution.steps.CacheStep.lambda$executeWithCache$3(CacheStep.java:106)
        at org.gradle.internal.Try$1.apply(Try.java:59)
        at org.gradle.internal.Try$1.apply(Try.java:56)
        at org.gradle.internal.Try$Success.flatMap(Try.java:102)
        at org.gradle.internal.Try.map(Try.java:56)
        at org.gradle.internal.execution.steps.CacheStep.executeWithCache(CacheStep.java:79)
        at org.gradle.internal.execution.steps.CacheStep.execute(CacheStep.java:69)
        at org.gradle.internal.execution.steps.CacheStep.execute(CacheStep.java:45)
        at org.gradle.internal.execution.steps.BroadcastChangingOutputsStep.execute(BroadcastChangingOutputsStep.java:49)
        at org.gradle.internal.execution.steps.StoreSnapshotsStep.execute(StoreSnapshotsStep.java:43)
        at org.gradle.internal.execution.steps.StoreSnapshotsStep.execute(StoreSnapshotsStep.java:32)
        at org.gradle.internal.execution.steps.RecordOutputsStep.execute(RecordOutputsStep.java:38)
        at org.gradle.internal.execution.steps.RecordOutputsStep.execute(RecordOutputsStep.java:24)
        at org.gradle.internal.execution.steps.SkipUpToDateStep.executeBecause(SkipUpToDateStep.java:96)
        at org.gradle.internal.execution.steps.SkipUpToDateStep.lambda$execute$0(SkipUpToDateStep.java:89)
        at java.util.Optional.map(Optional.java:215)
        at org.gradle.internal.execution.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:54)
        at org.gradle.internal.execution.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:38)
        at org.gradle.internal.execution.steps.ResolveChangesStep.execute(ResolveChangesStep.java:77)
        at org.gradle.internal.execution.steps.ResolveChangesStep.execute(ResolveChangesStep.java:37)
        at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsFinishedStep.execute(MarkSnapshottingInputsFinishedStep.java:36)
        at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsFinishedStep.execute(MarkSnapshottingInputsFinishedStep.java:26)
        at org.gradle.internal.execution.steps.ResolveCachingStateStep.execute(ResolveCachingStateStep.java:90)
        at org.gradle.internal.execution.steps.ResolveCachingStateStep.execute(ResolveCachingStateStep.java:48)
        at org.gradle.internal.execution.impl.DefaultWorkExecutor.execute(DefaultWorkExecutor.java:33)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:117)
        at org.gradle.api.internal.tasks.execution.ResolveBeforeExecutionStateTaskExecuter.execute(ResolveBeforeExecutionStateTaskExecuter.java:75)
        at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:62)
        at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:108)
        at org.gradle.api.internal.tasks.execution.ResolveBeforeExecutionOutputsTaskExecuter.execute(ResolveBeforeExecutionOutputsTaskExecuter.java:67)
        at org.gradle.api.internal.tasks.execution.StartSnapshotTaskInputsBuildOperationTaskExecuter.execute(StartSnapshotTaskInputsBuildOperationTaskExecuter.java:62)
        at org.gradle.api.internal.tasks.execution.ResolveAfterPreviousExecutionStateTaskExecuter.execute(ResolveAfterPreviousExecutionStateTaskExecuter.java:46)
        at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:94)
        at org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute(FinalizePropertiesTaskExecuter.java:46)
        at org.gradle.api.internal.tasks.execution.ResolveTaskExecutionModeExecuter.execute(ResolveTaskExecutionModeExecuter.java:95)
        at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:57)
        at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:56)
        at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:36)
        at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.executeTask(EventFiringTaskExecuter.java:73)
        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:416)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:406)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:165)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:250)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:158)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:102)
        at org.gradle.internal.operations.DelegatingBuildOperationExecutor.call(DelegatingBuildOperationExecutor.java:36)
        at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.execute(EventFiringTaskExecuter.java:49)
        at org.gradle.execution.plan.LocalTaskNodeExecutor.execute(LocalTaskNodeExecutor.java:43)
        at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$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$1.run(ManagedExecutorImpl.java:46)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55)
        at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.RuntimeException: com.android.builder.dexing.DexArchiveMergerException: Error while merging dex archives: 
        at java.util.concurrent.ForkJoinTask$AdaptedCallable.exec(ForkJoinTask.java:1431)
        at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
        at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
        at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
        at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)
Caused by: com.android.builder.dexing.DexArchiveMergerException: Error while merging dex archives: 
        at com.android.builder.dexing.D8DexArchiveMerger.getExceptionToRethrow(D8DexArchiveMerger.java:131)
        at com.android.builder.dexing.D8DexArchiveMerger.mergeDexArchives(D8DexArchiveMerger.java:118)
        at com.android.build.gradle.internal.transforms.DexMergerTransformCallable.call(DexMergerTransformCallable.java:102)
        at com.android.build.gradle.internal.transforms.DexMergerTransformCallable.call(DexMergerTransformCallable.java:37)
        at java.util.concurrent.ForkJoinTask$AdaptedCallable.exec(ForkJoinTask.java:1424)
        ... 4 more
Caused by: com.android.tools.r8.CompilationFailedException: Compilation failed to complete
        at com.android.tools.r8.utils.ExceptionUtils.withCompilationHandler(ExceptionUtils.java:81)
        at com.android.tools.r8.utils.ExceptionUtils.withD8CompilationHandler(ExceptionUtils.java:45)
        at com.android.tools.r8.D8.run(D8.java:94)
        at com.android.builder.dexing.D8DexArchiveMerger.mergeDexArchives(D8DexArchiveMerger.java:116)
        ... 7 more
Caused by: com.android.tools.r8.utils.AbortException: Error: null, Cannot fit requested classes in the main-dex file (# methods: 65566 > 65536)
        at com.android.tools.r8.utils.Reporter.failIfPendingErrors(Reporter.java:101)
        at com.android.tools.r8.utils.Reporter.fatalError(Reporter.java:72)
        at com.android.tools.r8.dex.VirtualFile.throwIfFull(VirtualFile.java:193)
        at com.android.tools.r8.dex.VirtualFile$DistributorBase.fillForMainDexList(VirtualFile.java:328)
        at com.android.tools.r8.dex.VirtualFile$FillFilesDistributor.run(VirtualFile.java:380)
        at com.android.tools.r8.dex.ApplicationWriter.distribute(ApplicationWriter.java:200)
        at com.android.tools.r8.dex.ApplicationWriter.write(ApplicationWriter.java:221)
        at com.android.tools.r8.D8.run(D8.java:215)
        at com.android.tools.r8.D8.lambda$run$1(D8.java:97)
        at com.android.tools.r8.utils.ExceptionUtils.withCompilationHandler(ExceptionUtils.java:62)
        ... 10 more
4

1 回答 1

3

这是否意味着 R8 仍然可以工作，或者它只是 r8 包中的 dexer？

您的堆栈跟踪仅显示 D8 的类（请注意，D8 的类驻留在com.android.tools.r8包中，这可能会导致混淆）。

您可以通过简单地查找已执行的任务名称来验证是否会调用 D8、带有 Proguard 的 D8 或 R8（以下所有测试均使用 AGP 3.4.2 执行）。

android.enableR8=false, minifyEnabled=false => D8 

$ ./gradlew assembleRelease --dry-run  
// ... redacted  
:app:transformClassesWithDexBuilderForRelease SKIPPED  
// ... redacted

android.enableR8=false, minifyEnabled=true => D8 with Proguard 

$ ./gradlew assembleRelease --dry-run  
// ... redacted  
:app:transformClassesAndResourcesWithProguardForRelease SKIPPED  
// ... redacted

android.enableR8=false, minifyEnabled=true, useProguard=false => D8 with Proguard 

$ ./gradlew assembleRelease --dry-run  
// ... redacted  
:app:transformClassesAndResourcesWithProguardForRelease SKIPPED  
// ... redacted

android.enableR8=true, minifyEnabled=true => R8 

$ ./gradlew assembleRelease --dry-run  
// ... redacted  
:app:transformClassesAndResourcesWithR8ForRelease SKIPPED  
// ... redacted

android.enableR8=true, minifyEnabled=true, useProguard=true => R8 

$ ./gradlew assembleRelease --dry-run  
// ... redacted  
:app:transformClassesAndResourcesWithR8ForRelease SKIPPED  
// ... redacted

R8 与 D8 简短回顾

根据文档：

D8是一个将java字节码转换为dex码的dexer。
R8是一个java程序收缩和缩小工具，将java字节码转换为优化的dex码。

Jake Wharton更准确的定义：

R8 是 D8 的一个版本，它也执行优化。它不是一个单独的工具或代码库，只是在更高级模式下运行的同一个工具。D8 首先将 Java 字节码解析为它自己的中间表示 (IR)，然后写出 Dalvik 字节码，而 R8 在 IR 写出之前添加了优化传递。

想要禁用 D8（除了 R8）的人的注意事项：

还有用于选择 dx（D8 的前身）的附加标志（请参阅此博文）：
android.enableD8=false

从 AGP 3.1.2 版开始，显示以下弃用警告，即使它仍然有效（使用 AGP v3.4.2 测试）：

警告：“android.enableD8”选项已弃用，不应再使用。
使用 'android.enableD8=true' 删除此警告。
它将在未来的 AGP 版本中删除。有关更多详细信息，请参阅 https://d.android.com/r/studio-ui/d8-overview.html。

于 2019-08-03T21:11:04.020 回答