MVVM on Android

In this course, you will learn how to build an Android app using the Model-View-ViewModel presentation architecture pattern including testing. By Joe Howard.

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Who is this for?

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.

Covered concepts

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

Part 1: MVVM on Android

01
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Let’s review what you will be learning in this course, including a brief discussion of benefits of MVVM and the course sample project.

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

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

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

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

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

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

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

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

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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 1:45
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Review what you learned in the course and learn about other potential architecture patterns for your Android apps.