Is the code compatible between different versions of Android?

Question

Java

Good!
There was a question, I want to write an application for Android. So, there are many versions of it, my goal is from kit-kat and above. If you write an application for a kit-kat, it will start on newer ones, taking into account the fact that I will use standard buttons, lists, etc. from the Android GUI or will you have to rebuild for new ones?