Android Studio中R类报错 cannot resolve symbol 'R'

问题如图所示: 跟着《第一行代码》在学,小白,clean project之后就变成这样了,然后根据网上的教程做了如下操作: (1)clean project—>rebuild project (2)sync project with gradle files—>invalidate caches/restart... (3)settings—>editor—>general—>auto impor
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