Gain insights into MVVM architecture in Android with Kotlin. Learn about networking with Retrofit, local storage with Room, and pagination. Discover how to build scalable, maintainable apps.

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The course focuses on the MVVM (Model-View-ViewModel) architecture in Android development using Kotlin. The MVVM is widely recommended due to its robustness, scalability, and ease of maintenance. It is a valuable skill to have for building high-performance Android applications.

Firstly, you will learn the basics of MVVM architecture and its advantages over other approaches to Android development. Then, you'll start from scratch and create layouts for a news application. Next, you'll use the Retrofit and OkHttp networking libraries and get to familiarize yourself with APIs. You'll get hands-on experience in storing data locally via the Room library. Finally, you'll be introduced to both the repository and ViewModel patterns, as well as how to work with the Paging library and deliver data to our fragments.

By the time you’re done with the course, you’ll be able to use MVVM in your Android projects, interact with APIs, store data locally, and implement pagination.

Mastering MVVM Architecture in Android Development using Kotlin

# Why handle internet connections?
Most Android applications fetch data remotely from APIs, and to do that efficiently, our device needs to be connected to an active network.

We, as developers, must inform the user when an internet connection is required to load data. To do that, we must develop a mechanism to simply detect if the device is connected to an active internet connection source.This can be mobile data or a WiFi connection.

In other instances, an application can just crash if it’s meant to make use of the internet and the device is not connected. This is a case where the developer hasn’t handled internet connection issues. In this lesson, we’ll learn how to handle internet connections in our Android programs.

## Making changes to the ViewModel
Views are only used to present data. UI-related logic is handled by the ViewModel. We’ll make a few changes to the `NewsViewModel `to accommodate the logic that handles internet connectivity.
Let's get into it!

Instead of `NewsViewModel` extending the ViewModel class, we’ll extend the `AndroidViewModel`. The difference between the two is that the `AndroidViewModel` will allow us to use context in our logic, while ViewModel doesn’t permit the use of context in its class. This marks the beginning of the refactoring process.

Code refactoring is a process of improving our code by restructuring it in a way that doesn't affect its external behavior. The goal is just to improve its internal code. Below is the extension.


Learn how to handle the loss of internet connections.

Introduction

MVVM Architecture

Layouts

Layout Design Assessment

API

Android Web Services Assessment

Utility Classes

Repository Pattern

ViewModel Pattern

Android Business Logic Assessment

Views

Conclusion

Appendix

Handling Internet Connections

Why handle internet connections?

Making changes to the ViewModel