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Android Retrofit 2 complete course in Kotlin (Udemy.com)

Learn to use all features of Retrofit for your Android network communication requirements

Created by: Catalin Stefan

Last updated February 2026

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What you will learn

  • Retrofit
  • Network communication for Android
  • Paging
  • Synchronous vs asynchronous communications
  • Build different types of requests
  • URL manipulation
  • Work with headers
  • Logging
  • Caching

How it compares

Against the other 149 rated Udemy courses in Mobile Development on CourseDuck:

  • Rating4.2 out of 5higher than 13% of them
  • Reviews176#70 of 150 by number of reviews
  • Length6.2 hoursshorter than 59% of them
  • Last updatedFebruary 2026more recently than 73% of them

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Course Description

This is the most complete resource online for learning about Retrofit for Android development

This course will take you step by step, through each concept related to Retrofit, discuss it in detail, then apply it in a practical project.

We will cover topics such as:

  • Basic Retrofit implementation

  • Logging

  • URL resolution

  • GET, POST and other request methods

  • Queries

  • URL manipulation

  • Request body

  • Sending form data

  • Headers

  • Canceling requests

  • Caching

  • Pagination

  • Synchronous vs asynchronous communications

  • Retrofit with RxJava

  • Authentication

In addition, we will also be working on two Android apps to apply the knowledge we learned.

  • StockOverflow communication app

  • GitHub authentication and data retrieval app

This course is great if you want to take your Retrofit skills to the next level.

Sign up today and let's start learning about Retrofit for Android.

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Instructor Details

Catalin Stefan

I am an avid learner and teaching enthusiast. I love creating videos and courses that enrich people's lives and help them have a better experience, both personally and professionally. 

I am an expert mobile application developer with over 10 years development experience. I enjoy making courses related to AI, software development and mobile apps, and want to share the knowledge I have acquired.

I create courses based on my professional experience. I hope to teach people skills that help them in their careers, allow them to acquire new skills and improve their personal relationships.

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Reviews

4.2

176 ratings on Udemy

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By Daniel on 10/9/2023

So far pretty clear and easy to understand, nice and complete example applying all the concepts learn

By Sergei Kolinichenko on 9/14/2023

Firstly, the course is severely outdated, and the example provided in the first part of the course doesn't work at all. Secondly, I expected more from the course specifically on Retrofit because in Andrei Sumin's Kotlin courses, there is not significantly less information about this library. Overall, I am disappointed with the course.

By Anonymized User on 5/11/2023

This is a match for me, I am getting to understand the retrofit service and excited for the coming videos

By peerzada burhan on 3/29/2023

Before going for this course i highly recommend to check "coding in flows" retrofit tutorial playlist on youTube. You will get the best value out of it.

By Christopher Annunziato on 9/21/2022

Exactly what I needed to get my application working. Everything is up to date and works. I recreated the project entirely to learn more. Super happy with this.

By Edison Setiawan on 6/11/2022

This is a great and recommended course for those who want to learn about Retrofit, but it might be better if the material was more varied. For example on the use of RxJava, there are also examples of Flowable types, not only Single types (just a suggestion).

By Juan Cruz Frini on 5/23/2022

The course was very practice and concise, good to practice networking with current uses technologys, a great job. Greetings from Argentina

By Jairo Franco Lima Gomes on 3/22/2022

Como todos os Cursos do Mestre, excelente. Capricho nos exemplos, na didática e no cuidado com a apresentação do conteúdo. Infelizmente o Mestre, embora peça para entrar em contato para melhoras e pontos de dúvidas, não responde a nenhum contato.

By Srdjan Popovic on 1/5/2021

Nicely explained Retrofit principles at the very beginning of the course. Later on, it looks like an author doesn't have the patience to explain some crucial things inside the project. Also in the comments, there are a lot of unanswered questions. From my point of view, it's better to focus on quality instead of quantity. Also, I have to say it's a bit sad because within the project for example for authentication, token and everything is just mentioned as a base concept without paying attention to refreshing and everything else what could be the use case for token. Overall it's a good course, gives basic knowledge and overview for Retrofit and how to start using it. Thanks.

By Matt grier on 8/7/2020

The explanations are clear, the examples so far are good. I particularly got this course to learn how to implement an oauth2 authentication token call, and have not come across that yet but overall my knowledge of how to structure general api calls with retrofit has already increased a fair amount.

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Overall Score : 84 / 100