Android Studio suddenly cannot resolve symbols

Question

Android Studio 0.4.2 was working fine and today I opened it and almost everything was red and the auto-completion had stopped working. I look at the imports and AS seems to

Answer 1

I have finally figured out what causes this issue.

Actually, you should avoid pushing .idea/libraries folder to your repository. It creates weird stuff in Android Studio which tends to remove all downloaded libraries.

If you have commit history, just recreate all missing library files and avoid them to be committed again. Otherwise, just remove whole .idea folder and reimport it into AS.