concept

ViewModel

ViewModel is a design pattern and architectural component that manages UI-related data in a lifecycle-conscious way, separating it from the UI controller (like an Activity or Fragment). It survives configuration changes such as screen rotations, ensuring data persistence and reducing boilerplate code for state handling. Commonly used in Android development with the Android Architecture Components, it promotes a clean separation of concerns between the UI and business logic.

Also known as: MVVM ViewModel, Android ViewModel, ViewModel Pattern, Lifecycle ViewModel, AAC ViewModel

🧊Why learn ViewModel?

Developers should learn ViewModel to build robust Android apps that handle configuration changes gracefully without losing user data, improving user experience and reducing crashes. It is essential for implementing the Model-View-ViewModel (MVVM) architecture, which enhances testability and maintainability by decoupling UI logic from data operations. Use cases include managing form inputs, user sessions, or live data updates in reactive applications.