I looked into the .idea/libraries folder and noticed there's no appropriate metafile for the new version ... 5)-restart your android studio. and your issue is resolved.
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appcompatactivity not found in android studio
Basically, this problem arises in the new version of Android Studio. Can't solve the appCompatActivity symbol, can not decide the symbol AppCompatActivity .... Nov 14, 2018 — AppCompatActivity is now androidx.appcompat.app. ... should be as easy as running the "Migrate to AndroidX" tool in Android Studio. ... For example, it's missing most of the design library class mappings (i.e. classes in .... Feb 25, 2020 — Adding support-v4 library as dependency in Android Studio project? ... then you should not import AndroidX classes of the same name. ... AppCompatActivity rather than android.support.v4.app. ... Action Bar - Missing Menu. 3925e8d270
https://brunfortcatrene.wixsite.com/unalharso/post/boys-at-the-pool-39-2020-08-23-00-04-41-imgsrc-ru