Welkin IT Services Android Developer Interview Questions and Answers

Singleton, Explain MVVM and what are advantages over MVC

Q1. Explain MVVM in brief
Ans. 
MVVM is a design pattern that separates the UI logic from the business logic in an application.
• Model: Represents the data and business logic of the application

• View: Represents the UI components of the application

• ViewModel: Acts as a mediator between the Model and View, handling the UI logic and data binding

• Encourages separation of concerns and easier unit testing
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Q2. Explain dependency injection
Ans. 
Dependency injection is a design pattern where components are provided with their dependencies rather than creating them internally.
• In dependency injection, the dependencies of a component are injected from the outside.

• This helps in making components more modular, testable, and reusable.

• There are three types of dependency injection - constructor injection, setter injection, and interface injection.
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