Cannot resolve symbol xxx
解决办法：
“File” -> “Invalidate Caches / Restart”
点击对话框中的 “Invalidate and Restart”，清空 cache 并且重启
Cannot resolve symbol ‘R’
Build -> Clean Project
Tools -> Android -> Sync Project With Gradle Files
Cannot resolve symbol xxx解决办法：
“File” -> “Invalidate Caches / Restart”
点击对话框中的 “Invalidate and Restart”，清空 cache 并且重启
Cannot resolve symbol ‘R’Build -> Clean Project
Tools -> Android -> Sync Project With Gradle Files
本文标题：Cannot resolve symbol xxx
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