Difference between MVC & MVP & MVVM?

77. Difference between MVC & MVP & MVVM?

MVC is the Model-View-Controller architecture where model refers to the data model classes. The view refers to the xml files and the controller handles the business logic. The issue with this architecture is unit testing. The model can be easily tested since it is not tied to anything. The controller is tightly coupled with the android apis making it difficult to unit test. Modularity & flexibility is a problem since the view and the controller are tightly coupled. If we change the view, the controller logic should also be changed. Maintenance is also an issues.

MVP architecture: Model-View-Presenter architecture. The View includes the xml and the activity/fragment classes. So the activity would ideally implement a view interface making it easier for unit testing (since this will work without a view).Sample Implementation

MVVM: Model-View-ViewModel Architecture. The Model comprises data, tools for data processing, business logic. The View Model is responsible for wrapping the model data and preparing the data for the view. IT also provides a hook to pass events from the view to the model.Sample Implementation

78. S.O.L.I.D principles in software development?

• The Single Responsibility Principle (SRP)
• The Open-Closed Principle (OCP)
• The Liskov Substitution Principle (LSP)
• The Interface Segregation Principle (ISP)
• The Dependency Inversion Principle (DIP)

You can checkout the whole article on what this means from here.

79. RxJava in Android?

• RxJava Introduction and Operators for creating Observables
• RxJava Operators: Operators for Transforming Observables
• RxJava Operators: Operators for Filtering Observables
• RxJava Operators: Operators for Combining Observables
• RxJava Operators: Utility Operators
• RxJava Operators: Conditional and Boolean Operators
• RxJava Operators: Mathematical and Aggregate Operators
• RxJava: Different types of Observables