Kotlin的报错提示：
:app:dexBuilderDebug
Invoke-customs are only supported starting with Android O (--min-api 26)
org.gradle.workers.internal.DefaultWorkerExecutor$WorkExecutionException: A failure occurred while executing com.android.build.gradle.internal.dexing.DexWorkAction
org.gradle.tooling.BuildException: Failed to process: D:\android\FloatMenu\app\build\tmp\kotlin-classes\debug, D:\android\FloatMenu\app\build\intermediates\javac\debug\classes
com.android.builder.dexing.DexArchiveBuilderException: Failed to process: D:\android\FloatMenu\app\build\tmp\kotlin-classes\debug, D:\android\FloatMenu\app\build\intermediates\javac\debug\classes
com.android.builder.dexing.DexArchiveBuilderException: Error while dexing.
com.android.tools.r8.CompilationFailedException: Compilation Failed to complete
com.android.tools.r8.internal.a: Invoke-customs are only supported starting with Android O (--min-api 26)
java.util.concurrent.ExecutionException: com.android.tools.r8.internal.a: Invoke-customs are only supported starting with Android O (--min-api 26)
[CIRculaR REFERENCE: com.android.tools.r8.internal.a: Invoke-customs are only supported starting with Android O (--min-api 26)]
Failed to process: D:\android\FloatMenu\app\build\tmp\kotlin-classes\debug, D:\android\FloatMenu\app\build\intermediates\javac\debug\classes
解决：
