Android applications predominantly use Model View Presenter

design pattern.

1. Model: This is the domain model of the Android

application. It contains the business logic and business

rules.

2. View: These are the UI components in your application.

These are part of the view. Also any events on UI

components are part of view module.

3. Presenter: This is the bridge between Model and View to

control the communication. Presenter can query the model

and return data to view to update it.

4. E.g. If we have a Model with large news article data, and

view needs only headline, then presenter can query the

data from model and only give headline to view. In this

way view remains very light in this design pattern.

https://medium.com/@ahmadkazimi/6-design-patterns-every-android-developer-must-know-53d912b5864b