I am confused about the assets folder. It doesn\'t come auto-created in Android Studio, and almost all the forums in which this is discussed talk about Eclipse.
Let Android Studio do it for you.
folder and navigate to the Assets Folder.
Finish.
And voila! It will create the assets folder in the main target source set.

It's simple, follow these steps
File > New > Folder > Assets Folder
Note : App must be selected before creating folder.
Src/main/Assets
It might not show on your side bar if the app is selected. Click the drop-down at the top that says android and select packages. you will see it then.
Two ways:
Select app/main folder, Right click and select New => Folder => Asset Folder. It will create 'assets' directory in main.
Select main folder, Right click and select New => Directory Enter name as 'assets' = > Ok.