android studio 2.2.1 cannot resolve symbol * - android-studio

I use android-studio 2.1.1 in the past, yesterday I downloaded android-studio 2.2.1, but found cannot resolve symbol error, now I use android-studio 2.1.1 and everything is ok, I have already tried :
1、File->Invalidata Caches/Restart->Invalidata and Restart
2、Build->Make Module
3、Build->Make Project
4、Build->Clean Project
5、Build->Rebuild Project
can anyone help me , thanks in advance.

I encountered the same problem as you. Google released android studio 2.2 preview 2 today - I downloaded and tried it, and it solves this problem.

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