Android developers can use Java and XML code to define the layouts for each Activity in an application. The application resources folder holds the XML layout files as well as graphics for the GUI.

Samsung has reportedly changed how it plans on launching One UI updates with it's latest devices, and it's based on Google's ...

Android's Achilles heel, aside from the "toxic hellstew" of security patches and fragmentation -- which is outside the scope of this article and my Survival Test series -- is Java.