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

# Networking in android

Here, we’ll dive a little deeper into how `Retrofit` works in Android applications.
So far, we’ve used the HTTP methods to call our API endpoints in the interface. Now, we’ll use networking libraries to convert the REST API to Java interface in JSON format to be loaded into our application.

Before we start looking at different components and libraries used in Android networking, let’s first learn about the networking process in Android.

## HTTP
The Android networking layer revolves around making hyper text transfer protocol (HTTP) requests and responses because HTTP is the fundamental networking protocol used to connect to the internet. Regardless of whether we’re using the web, mobile, or IoT apps, we’ll still need this protocol.

## **HTTP** (Hyper Text Transfer Protocol)

 Android networking layer revolves around making HTTP requests and responses because HTTP is the fundamental networking protocol used to connect to the internet. Whether you are using the web, mobile, or IoT apps, you will still need this protocol.


 Regarding HTTP requests and responses: we have status codes returned to help us figure out what’s happening to our request. If there’s a success or failure in our responses, we’ll be able to get to the root of our problem.

These are the status codes:

- 1xx, Continue: Wait for the request to finish or ignore the response if not already finished.
- 2xx, OK: The request succeeded.
- 3xx, More than one response: The response has multiple choices, and the user has to choose the one they’re interested in.
- 4xx, Bad request: The response is unsuccessful due to client error, or the server just can’t fulfill the request.
- 5xx, Internal server error: An error from the backend meaning that the server is unable to fulfill the request or can’t get a response in time.

These codes come in handy when we’re testing our backend services or the APIs for a response to avoid errors during production or when the user is making requests to the server.


Learn how to work with the Retrofit and OkHttp networking libraries.

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

Working with Retrofit

Networking in android

HTTP

HTTP (Hyper Text Transfer Protocol)