Android Studio Rendering Problems : The following classes could not be found

Question

I just update Android Studio, and when I restarted it, the preview window rendering failed, and I was told that

The following classes could not be fo

Answer 1

You have to do two things:

• be sure to have imported right appcompat-v7 library in your project structure -> dependencies
• change the theme in the preview window to not an AppCompat theme. Try with Holo.light or Holo.dark for example.