Android Studio随机抛出异常

Question

我已经开始使用Android Studio (版本3.1.2)和学习Android开发大约一周的时间，从第一天开始，IDE就一直在随意抛出异常。抛出的异常都不会影响我的工作流程，并且IDE会继续正常工作(至少看起来是这样)。异常的类型可能会因时间不同而不同，但最常见的是下面的一个。通过在线查找，我得到的结果来自那些代码中有错误或正在使用日志库的人。这两个都不是我的案子。那么为什么会发生这种情况呢？

Stub index points to a file without PSI: com.intellij.openapi.fileTypes.UnknownFileType@6e0b0e23
    com.intellij.openapi.diagnostic.Logger$EmptyThrowable
        at com.intellij.openapi.diagnostic.Logger.error(Logger.java:140)
        at com.intellij.psi.stubs.StubProcessingHelperBase.processStubsInFile(StubProcessingHelperBase.java:47)
        at com.intellij.psi.stubs.StubIndexImpl$2.process(StubIndexImpl.java:327)
        at com.intellij.psi.stubs.StubIndexImpl$StubIdListContainerAction.perform(StubIndexImpl.java:618)
        at com.intellij.psi.stubs.StubIndexImpl$StubIdListContainerAction.perform(StubIndexImpl.java:606)
        at com.intellij.util.indexing.ValueContainer.forEach(ValueContainer.java:62)
        at com.intellij.psi.stubs.StubIndexImpl.doProcessStubs(StubIndexImpl.java:356)
        at com.intellij.psi.stubs.StubIndexImpl.processElements(StubIndexImpl.java:319)
        at com.intellij.psi.stubs.StubIndex.getElements(StubIndex.java:145)
        at com.intellij.psi.stubs.StubIndex.getElements(StubIndex.java:134)
        at com.intellij.psi.impl.java.stubs.index.JavaShortClassNameIndex.get(JavaShortClassNameIndex.java:53)
        at com.intellij.psi.impl.PsiShortNamesCacheImpl.getClassesByName(PsiShortNamesCacheImpl.java:63)
        at com.intellij.psi.impl.CompositeShortNamesCache.getClassesByName(CompositeShortNamesCache.java:77)
        at com.intellij.psi.impl.search.AllClassesSearchExecutor.lambda$processClassesByNames$1(AllClassesSearchExecutor.java:82)
        at com.intellij.openapi.project.DumbService.lambda$runReadActionInSmartMode$0(DumbService.java:94)
        at com.intellij.openapi.project.DumbService.runReadActionInSmartMode(DumbService.java:125)
        at com.intellij.openapi.project.DumbService.runReadActionInSmartMode(DumbService.java:94)
        at com.intellij.psi.impl.search.AllClassesSearchExecutor.processClassesByNames(AllClassesSearchExecutor.java:82)
        at com.intellij.codeInsight.completion.AllClassesGetter.processJavaClasses(AllClassesGetter.java:150)
        at com.intellij.codeInsight.completion.AllClassesGetter.processJavaClasses(AllClassesGetter.java:136)
        at com.intellij.codeInsight.completion.JavaClassNameCompletionContributor.addAllClasses(JavaClassNameCompletionContributor.java:142)
        at com.intellij.codeInsight.completion.JavaNoVariantsDelegator.suggestNonImportedClasses(JavaNoVariantsDelegator.java:186)
        at com.intellij.codeInsight.completion.JavaNoVariantsDelegator.fillCompletionVariants(JavaNoVariantsDelegator.java:76)
        at com.intellij.codeInsight.completion.CompletionService.getVariantsFromContributors(CompletionService.java:83)
        at com.intellij.codeInsight.completion.CompletionResultSet.runRemainingContributors(CompletionResultSet.java:149)
        at com.intellij.codeInsight.completion.CompletionResultSet.runRemainingContributors(CompletionResultSet.java:142)
        at com.intellij.codeInsight.completion.JShellCompletionContributor.fillCompletionVariants(JShellCompletionContributor.java:28)
        at com.intellij.codeInsight.completion.CompletionService.getVariantsFromContributors(CompletionService.java:83)
        at com.intellij.codeInsight.completion.CompletionResultSet.runRemainingContributors(CompletionResultSet.java:149)
        at com.intellij.codeInsight.completion.CompletionResultSet.runRemainingContributors(CompletionResultSet.java:142)
        at com.intellij.codeInsight.template.impl.LiveTemplateCompletionContributor$2.addCompletions(LiveTemplateCompletionContributor.java:90)
        at com.intellij.codeInsight.completion.CompletionProvider.addCompletionVariants(CompletionProvider.java:36)
        at com.intellij.codeInsight.completion.CompletionContributor.fillCompletionVariants(CompletionContributor.java:152)
        at com.intellij.codeInsight.completion.CompletionService.getVariantsFromContributors(CompletionService.java:83)
        at com.intellij.codeInsight.completion.CompletionService.performCompletion(CompletionService.java:112)
        at com.intellij.codeInsight.completion.CompletionProgressIndicator.calculateItems(CompletionProgressIndicator.java:839)
        at com.intellij.codeInsight.completion.CompletionProgressIndicator.access$600(CompletionProgressIndicator.java:92)
        at com.intellij.codeInsight.completion.CompletionProgressIndicator$1CalculateItems.run(CompletionProgressIndicator.java:821)
        at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1130)
        at com.intellij.codeInsight.completion.AsyncCompletion.tryReadOrCancel(CompletionThreading.java:181)
        at com.intellij.codeInsight.completion.CompletionProgressIndicator.lambda$startCompletion$6(CompletionProgressIndicator.java:832)
        at com.intellij.codeInsight.completion.AsyncCompletion.lambda$null$0(CompletionThreading.java:108)
        at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$1(CoreProgressManager.java:157)
        at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:543)
        at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:488)
        at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:94)
        at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:144)
        at com.intellij.codeInsight.completion.AsyncCompletion.lambda$startThread$1(CompletionThreading.java:104)
        at com.intellij.openapi.application.impl.ApplicationImpl$1.run(ApplicationImpl.java:315)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)

Answer 1

我也有同样的问题，无效缓存和重启为我解决了这个问题。File -> Invalidate Caches / Restart -> Invalidate and Restart。