Convert website to an Android app – When you have a website you may want to create an app so that people can access your website without using a web browser.
There are many choices to achieve this some website offer :
www.appypie.com; www.andromo.com; and many more
However, if you want to create using Android Studio you can following instruction from http://androidtechfreakat.blogspot.com/2015/11/professional-android-webview.html
By following the instruction above I can produce an APK file and uploaded to the Play store.
I suggest you to try using Android Studio, will be ad-free and the program will produce a small file compared to other software.