Cannot resolve symbol Theme, ThemeOverlay

Question

I updated my android studio to latest version - 3.0.1. Since then it complains \'Cannot resolve symbol\' for Theme and ThemeOverlay in the following lines of code. App runs

Answer 1

In my case , I have already defined the value in styles.xml file but it still notice me the problem like this:

But I still got an error like below:

I solve this problem by change the value like below:

Hope this is work for you too.Thank you!