androidStudio上R提示：Can't resolve symbol ‘R’ ，并出現如下錯誤：

Error:org.gradle.api.internal.changedetection.state.FileCollectionSnapshotImpl cannot be cast to org.gradle.api.internal.changedetection.state.OutputFilesCollectionSnapshotter$OutputFilesSnapshot
Possible causes for this unexpected error include:<ul><li>Gradle's dependency cache may be corrupt (this sometimes occurs after a network connection timeout.)
<a href="syncProject">Re-download dependencies and sync project (requires network)</a></li><li>The state of a Gradle build process (daemon) may be corrupt. Stopping all Gradle daemons may solve this problem.
<a href="stopGradleDaemons">Stop Gradle build processes (requires restart)</a></li><li>Your project may be using a third-party plugin which is not compatible with the other plugins in the project or the version of Gradle requested by the project.</li></ul>In the case of corrupt Gradle processes, you can also try closing the IDE and then killing all Java processes.

解決方法，進入到androidStudio的項目根目錄，進入.gradle目錄，刪除掉數字開頭的目錄（2.14.1 ? ?3.14.1）：

在androidstudio中點擊Tools -- ?Android --Sync project with gradle files

到此，問題達到解決

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