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?当把 minSdkVersion 设置为小于 26 时，build报出如下错误：
MethodHandle.invoke and MethodHandle.invokeExact are only supported starting with Android O (--min-api 26)
Stack trace:
com.android.tools.r8.errors.a: MethodHandle.invoke and MethodHandle.invokeExact are only supported starting with Android O (--min-api 26)
at com.android.tools.r8.errors.a.a(:7)
at com.android.tools.r8.ir.conversion.O.b(:58)
at com.android.tools.r8.ir.conversion.O.a(:104)
at com.android.tools.r8.ir.conversion.O.a(:53)
at com.android.tools.r8.graph.C.b(:40)
at com.android.tools.r8.ir.conversion.O.b(:35)
at com.android.tools.r8.utils.U0.a(:10)
at com.google.common.util.concurrent.TrustedListenableFutureTask$TrustedFutureInterruptibleTask.runInterruptibly(TrustedListenableFutureTask.java:125)
at com.google.common.util.concurrent.InterruptibleTask.run(InterruptibleTask.java:69)
at com.google.common.util.concurrent.TrustedListenableFutureTask.run(TrustedListenableFutureTask.java:78)
at com.google.common.util.concurrent.MoreExecutors$DirectExecutorService.execute(MoreExecutors.java:322)
at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134)
at com.google.common.util.concurrent.AbstractListeningExecutorService.submit(AbstractListeningExecutorService.java:66)
at com.google.common.util.concurrent.AbstractListeningExecutorService.submit(AbstractListeningExecutorService.java:36)
at com.android.tools.r8.utils.U0.a(:3)
at com.android.tools.r8.ir.conversion.O.a(:10)
at com.android.tools.r8.D8.d(:29)
at com.android.tools.r8.D8.b(:1)
at com.android.tools.r8.utils.W.a(:30)
at com.android.tools.r8.D8.run(:11)
at com.android.builder.dexing.D8DexArchiveBuilder.convert(D8DexArchiveBuilder.java:116)
at com.android.build.gradle.internal.dexing.DexWorkActionKt.process(DexWorkAction.kt:194)
at com.android.build.gradle.internal.dexing.DexWorkActionKt.processNonIncrementally(DexWorkAction.kt:164)
at com.android.build.gradle.internal.dexing.DexWorkActionKt.launchProcessing(DexWorkAction.kt:91)
at com.android.build.gradle.internal.dexing.DexWorkAction.run(DexWorkAction.kt:49)
at org.gradle.workers.internal.AdapterWorkAction.execute(AdapterWorkAction.java:50)
at org.gradle.workers.internal.DefaultWorkerServer.execute(DefaultWorkerServer.java:50)
at org.gradle.workers.internal.NoIsolationWorkerFactory$1$1.create(NoIsolationWorkerFactory.java:63)
at org.gradle.workers.internal.NoIsolationWorkerFactory$1$1.create(NoIsolationWorkerFactory.java:59)
at org.gradle.internal.classloader.ClassLoaderUtils.executeInClassloader(ClassLoaderUtils.java:98)
at org.gradle.workers.internal.NoIsolationWorkerFactory$1.lambda$execute$0(NoIsolationWorkerFactory.java:59)
at org.gradle.workers.internal.AbstractWorker$1.call(AbstractWorker.java:44)
at org.gradle.workers.internal.AbstractWorker$1.call(AbstractWorker.java:41)
at org.gradle.internal.operations.DefaultBuildOperationExecutor$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.workers.internal.AbstractWorker.executeWrappedInBuildOperation(AbstractWorker.java:41)
at org.gradle.workers.internal.NoIsolationWorkerFactory$1.execute(NoIsolationWorkerFactory.java:53)
at org.gradle.workers.internal.DefaultWorkerExecutor.lambda$submitWork$2(DefaultWorkerExecutor.java:200)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.runExecution(DefaultConditionalExecutionQueue.java:215)
at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.runBatch(DefaultConditionalExecutionQueue.java:164)
at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.run(DefaultConditionalExecutionQueue.java:131)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:48)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:56)
at java.lang.Thread.run(Thread.java:748)
Suppressed: java.util.concurrent.ExecutionException: com.android.tools.r8.errors.a: MethodHandle.invoke and MethodHandle.invokeExact are only supported starting with Android O (--min-api 26)
at com.google.common.util.concurrent.AbstractFuture.getDoneValue(AbstractFuture.java:552)
at com.google.common.util.concurrent.AbstractFuture.get(AbstractFuture.java:513)
at com.google.common.util.concurrent.FluentFuture$TrustedFuture.get(FluentFuture.java:86)
at com.android.tools.r8.utils.U0.a(:14)
at com.android.tools.r8.utils.U0.a(:9)
... 40 more
[CIRCULAR REFERENCE:com.android.tools.r8.errors.a: MethodHandle.invoke and MethodHandle.invokeExact are only supported starting with Android O (--min-api 26)]
Caused by: com.android.tools.r8.a: MethodHandle.invoke and MethodHandle.invokeExact are only supported starting with Android O (--min-api 26)
at com.android.tools.r8.ir.conversion.N.a(:633)
at com.android.tools.r8.ir.conversion.N.a(:674)
at com.android.tools.r8.r.n.A.a(:236)
at com.android.tools.r8.ir.conversion.o.a(:153)
at com.android.tools.r8.ir.conversion.N.a(:133)
at com.android.tools.r8.graph.l.a(:93)
at com.android.tools.r8.graph.l.a(:71)
at com.android.tools.r8.graph.l.buildIR(:1)
at com.android.tools.r8.graph.C0.buildIR(:1)
at com.android.tools.r8.graph.T.a(:152)
at com.android.tools.r8.ir.conversion.O.a(:412)
at com.android.tools.r8.ir.conversion.O.b(:53)
... 53 more
原因：在app模块的build.gradle中忘了为什么添加了如下的依赖
dependencies {
...
implementation files ('C:\\Program Files\\Java\\jdk1.8.0_251/jre/lib/rt.jar')
...
}
?解决方法：将这一条依赖去掉就好。
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