AndroidSupport到AndroidX库冲突记录

unity工程导出到AS中编译报错：

org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':checkDebugDuplicateClasses'.
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$3.accept(ExecuteActionsTaskExecuter.java:151)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$3.accept(ExecuteActionsTaskExecuter.java:148)
    at org.gradle.internal.Try$Failure.ifSuccessfulOrElse(Try.java:191)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:141)
    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.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: com.android.ide.common.workers.WorkerExecutorException: 1 exception was raised by workers:
java.lang.RuntimeException: Duplicate class android.support.v4.os.ResultReceiver found in modules core-1.3.1-runtime.jar (androidx.core:core:1.3.1) and jetified-support-v4-compat.jar (support-v4-compat.jar)
Duplicate class android.support.v4.os.ResultReceiver$1 found in modules core-1.3.1-runtime.jar (androidx.core:core:1.3.1) and jetified-support-v4-compat.jar (support-v4-compat.jar)
Duplicate class android.support.v4.os.ResultReceiver$MyResultReceiver found in modules core-1.3.1-runtime.jar (androidx.core:core:1.3.1) and jetified-support-v4-compat.jar (support-v4-compat.jar)
Duplicate class android.support.v4.os.ResultReceiver$MyRunnable found in modules core-1.3.1-runtime.jar (androidx.core:core:1.3.1) and jetified-support-v4-compat.jar (support-v4-compat.jar)
Duplicate class androidx.collection.ArrayMap found in modules collection-1.0.0.jar (androidx.collection:collection:1.0.0) and jetified-support-v4-compat.jar (support-v4-compat.jar)
Duplicate class androidx.collection.ArrayMap$1 found in modules collection-1.0.0.jar (androidx.collection:collection:1.0.0) and jetified-support-v4-compat.jar (support-v4-compat.jar)
Duplicate class androidx.collection.ArraySet found in modules collection-1.0.0.jar (androidx.collection:collection:1.0.0) and jetified-support-v4-compat.jar (support-v4-compat.jar)
Duplicate class androidx.collection.ArraySet$1 found in modules collection-1.0.0.jar (androidx.collection:collection:1.0.0) and jetified-support-v4-compat.jar (support-v4-compat.jar)
Duplicate class androidx.collection.CircularArray found in modules collection-1.0.0.jar (androidx.collection:collection:1.0.0) and jetified-support-v4-compat.jar (support-v4-compat.jar)
Duplicate class androidx.collection.CircularIntArray found in modules collection-1.0.0.jar (androidx.collection:collection:1.0.0) and jetified-support-v4-compat.jar (support-v4-compat.jar)
Duplicate class androidx.collection.ContainerHelpers found in modules collection-1.0.0.jar (androidx.collection:collection:1.0.0) and jetified-support-v4-compat.jar (support-v4-compat.jar)
Duplicate class androidx.collection.LongSparseArray found in modules collection-1.0.0.jar (androidx.collection:collection:1.0.0) and jetified-support-v4-compat.jar (support-v4-compat.jar)
Duplicate class androidx.collection.LruCache found in modules collection-1.0.0.jar (androidx.collection:collection:1.0.0) and jetified-support-v4-compat.jar (support-v4-compat.jar)
Duplicate class androidx.collection.MapCollections found in modules collection-1.0.0.jar (androidx.collection:collection:1.0.0) and jetified-support-v4-compat.jar (support-v4-compat.jar)
Duplicate class androidx.collection.MapCollections$ArrayIterator found in modules collection-1.0.0.jar (androidx.collection:collection:1.0.0) and jetified-support-v4-compat.jar (support-v4-compat.jar)
Duplicate class androidx.collection.MapCollections$EntrySet found in modules collection-1.0.0.jar (androidx.collection:collection:1.0.0) and jetified-support-v4-compat.jar (support-v4-compat.jar)
Duplicate class androidx.collection.MapCollections$KeySet found in modules collection-1.0.0.jar (androidx.collection:collection:1.0.0) and jetified-support-v4-compat.jar (support-v4-compat.jar)
Duplicate class androidx.collection.MapCollections$MapIterator found in modules collection-1.0.0.jar (androidx.collection:collection:1.0.0) and jetified-support-v4-compat.jar (support-v4-compat.jar)
Duplicate class androidx.collection.MapCollections$ValuesCollection found in modules collection-1.0.0.jar (androidx.collection:collection:1.0.0) and jetified-support-v4-compat.jar (support-v4-compat.jar)
。。。

全是类似报错。

1、AndroidStudio版本为3.5.2（这个很重要，当前这个版本已经使用androidx了），

由于我unity工程中集成了第三方的SDK，而第三方sdk使用的android是老版的jar包。

看报错log，其实是androidx.core:core:1.3.1和support-v4-compat.jar两个冲突了（其实是安卓升级导致的问题），我们把support-v4-compat.jar在依赖库中删除掉，然后编译就可以了。

2、如果还不行，可能是gradle.properties文件中缺少了两行设置：

android.useAndroidX=true
android.enableJetifier=true

在网上查了两天都没有解决，最后意外解决了，记录一下。