Introduction

Let’s review what you will be learning in this course, including a brief discussion of benefits of MVVM and the course sample project.

Understand MVVM

Learn about the need for architecture patterns like MVVM and define the layers of an MVVM app.

Build the Model

Create the Model layer for the course sample project, including adding JUnit tests of Model layer classes.

Model the Repository

Create a repository interface for saving your Model data, and implement a concrete version of the repository using the Room database library.

Explore the View

Examine the XML layout file and Kotlin class that constitute the View layer of the Add Creature screen.

Build the ViewModel

See how to use the Android Architecture Component ViewModel and LiveData classes to create a ViewModel layer for your app.

Test the ViewModel

Use JUnit to add unit tests for the functionality of the ViewModel layer, while utilizing Mockito to mock dependent classes.

Save Data to the Repository

Add the ability for the ViewModel to save Model data into the repository when receiving user events from the View layer.

Challenge: Add ViewModel Test

Prove out your understanding of writing ViewModel tests by adding a test

Challenge: Create a ViewModel

Put your new MVVM skills to work by creating a ViewModel for the All Creatures screen that shows a list of all creatures in the repository.

Conclusion

Review what you learned in the course and learn about other potential architecture patterns for your Android apps.

Intermediate Android developers who want to learn how to structure their projects in a scalable and maintainble way using the Model-View-ViewModel architecture pattern.

• Separation of Concerns
• Model-View-ViewModel (MVVM)
• Repository Pattern
• Writing Automated Tests