Android's different structure to manage the UI

With Android, Google implemented its very own UI component model, introducing various new terms and concepts probably unfamiliar to most developers. Although well designed and powerful, it is unconventional, has a high learning curve and, in some respects, lacks sufficient documentation. Basic use cases may be quick to implement, but in order to develop more complex applications, a thorough understanding of Android’s UI component model is essential.

To better understand this structure, I advise this awesome blog.