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。
