Table of Contents
What is ViewModel MVVM Android?
The ViewModel class is designed to store and manage UI-related data in a lifecycle conscious way. The ViewModel class allows data to survive configuration changes such as screen rotations. The Android framework manages the lifecycles of UI controllers, such as activities and fragments.
Why do we use MVVM pattern in Android?
MVVM is one of the architectural patterns which enhances separation of concerns, it allows separating the user interface logic from the business (or the back-end) logic. Finally, the view role in this pattern is to observe (or subscribe to) a ViewModel observable to get data in order to update UI elements accordingly.
What is meant by MVVM?
Model–view–viewmodel (MVVM) is a software architectural pattern that facilitates the separation of the development of the graphical user interface (the view) – be it via a markup language or GUI code – from the development of the business logic or back-end logic (the model) so that the view is not dependent on any …
What is difference between MVP and MVVM in Android?
Differences to MVP. MVVM uses data binding and is therefore a more event driven architecture. MVP typically has a one to one mapping between the presenter and the view, while MVVM can map many views to one view model In MVVM the view model has no reference to the view, while in MVP the view knows the presenter.
Should I use AndroidViewModel?
If you need to use context inside your Viewmodel you should use AndroidViewModel (AVM), because it contains the application context. To retrieve the context call getApplication() , otherwise use the regular ViewModel (VM). AndroidViewModel has application context.
Should I use MVVM in android?
View has a reference to View-Model but View-Model has no information about the View. There is many-to-one relationship between View and View-Model means many View can be mapped to one View-Model. It is completely independent of Views. MVVM is the best architecture for android app development.
What is LiveData in MVVM android?
In simple terms, LiveData is an observable data holder class. This means it can hold a set of data that can be observed from other Android components like Activities , Fragments , and Services . It’s lifecycle-aware and mostly used to update UI from the ViewModel in MVVM architecture projects.
What is data binding in Android?
The Data Binding Library is an Android Jetpack library that allows you to bind UI components in your XML layouts to data sources in your app using a declarative format rather than programmatically, reducing boilerplate code.
How does LiveData work?
LiveData follows the observer pattern. LiveData notifies Observer objects when underlying data changes. You can consolidate your code to update the UI in these Observer objects. That way, you don’t need to update the UI every time the app data changes because the observer does it for you.
What is MVM and MVVM in Android?
It makes the task easy for developers to maintain the software and to expand the features of the application in the future. MVC (Model — View — Controller), MVP (Model — View — Presenter), and MVVM (Model — View — ViewModel) is the most popular and industry-recognized android architecture pattern among developers.
What is difference between MVC and MVVM in Android?
KEY DIFFERENCE In MVC, controller is the entry point to the Application, while in MVVM, the view is the entry point to the Application. MVC Model component can be tested separately from the user, while MVVM is easy for separate unit testing, and code is event-driven.