How to add 'libs' folder in Android Studio?
The solution for me was very simple (after 10 hours of searching).Above where your folders are there is a combobox that says "android"click it and choose "Project".
Click the left side dropdown menu "android" and choose "project" to see libs folders
*after choosing project you will see the libs directory
libs and Assets folder in Android Studio:
Create libs folder inside app folder and Asset folder inside main in the project directory by exploring project directory.
Now come back to Android Studio and switch the combo box from Android to Project. enjoy...