It's been a few days at Android Studio 3.5.3 make a problem , the source code of Activity class and ParentClasses of this class (ContextThemeWrapper ,ContextWrapper and Context class) is been red the messages error of this problem are like:
Cannot resolve symbol android.annotation.nullable is not public in Android.annotation ...
Please help me ever resolve of this problem that was said in sites , I tried it but cannot resolve this problem.
On Android Studio, go to File > Invalidate Cache / Restart.
That should fix your issue.