Скачать или смотреть How to fix cannot resolve symbol AppCompatActivity - Android Studio

SOLVED: Cannot resolve symbol AppCompatActivity on Android Studio. If you have an old project version of Android Studio or from GitHub then watch this video till the end fro the solution step by step.

I've just tried to use Android Studio. I've opened an old project from Github and tried to create Activity that extends AppCompatActivity. Unfortunately Android Studio "says" that it
Cannot resolve symbol 'AppCompatActivity'


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