need very basic sample application and steps to run the application in unity.

thank you so much, right now i don't want to enter the gaming development, i need some sample apk for Oculus go for unity environment. I just want to explore how to install our custom apk to the Oculus go and controller.

well you'l want to learn unity, its not just for games. Its going to be the easiest way for you to get into creating an application for the go. Just decompiling other people's APK's isnt going to get you anywhere. 
I'd recommend you get unity, download the oculus samples from the asset store, try building those to the go and see how that works.

thanks, i will check in unity asset store.   :)