Android studio's file explorer has changed

Question

I just opened Android Studio and I noticed that the project explorer ( hierarchy viewer ) has changed and the project doesn't compile any more because the files are not in their proper location.

here's what the project viewer should be :

and now it's like this:

I can notice also that Android logo has disappeared from the viewer :

And I also get this error message:

Why is this happening ? What is the problem ?

Answer 1

Click on Enable Android Support , and your problem should be gone:

This should fix your problem.