Android studio no main activity, no layouts on a new project
After creating the project, you need to go to File menu and then Import Project. Then browse to the location of your project and import it. Then you will see all of these files and folders. I had this problem too, and it seems to be something that they overlooked in the newer versions of Android Studio (which is quite pathetic if you ask me).
From what i learned is that you may be picking the "no layout" option when prompted to pick one. Try picking the basic activity and the rest of the files will show