(MVVM) Model View View Model

Improvement from MVC, MVP to a better Architecture

• To overcome the drawbacks of MVC, MVP architecture modifications were done to segregate it to a better representation of architecture called Model-View-ViewModel.
• It is one of the very popular ways of structuring the android code.
• MVVM helps you to separate your code into many layers that let you have your own responsibilities.
• Code becomes more readable, testable, maintainable.
• The codebase stands the test of time.

Contents
MVVM block diagram
MVVM + Repository Pattern block diagram
Updates to view layer from view-model

---

MVVM block diagram

* `MVVM` handles the interaction between `view` and the `view model` in a specific way. * The `view-model` gethers the data from the `model` and provides to view in a specific way. * The `view` sends the events to the `view-model` and updates the `model`.

MVVM + Repository Pattern block diagram

* The `MVVM` can easily be upgraded with additional pattern such as `repository pattern`. * The repository helps to manage data from `local-databse` and `remote data-store`.

Updates to view layer from view-model

• We can use live data to update the view from view-model.