Android Studio更新（3.1.2）-整个项目陷入困境

Question

I just updated to Android Studio 3.1.2. After loading, I noticed that a lot of my code is in red. Unresolved symbols apparently. I have no idea how to fix this. I have been working on this for the last year and now can't do anything after the update. Please help me out.

This is just one of my classes.

I'm unsure of what my previous gradle version was, but now it is at 4.4, if that helps.

Answer 1

Try:

1) Build > Clean Project 2) File -> Invalidate Caches/Restart

Hope will help you.