Training: Mastering Retrofit - Harness the Power of REST APIs for Android

$2,310

  • 2 days
  • Onsite
  • 8 people max.
Ref: NLJ261
8 people max.
$2,310
In-company rate: from $4,190 for the whole team
On-site and certification exam on quote
2 days
Onsite

Don't let this gap widen

Why this program matters

  • Without mastery of Retrofit to integrate REST APIs into your Android apps, 40% of development time is wasted debugging recurring network errors, tripling delivery delays.

  • Each poorly handled API incident causes an average of 20% user crashes, triggering a 30% drop in downloads and revenue losses estimated at 15 000 € per quarter for a standard app.

  • Companies stagnate against the competition, with 65% of mobile project failures tied to faulty integrations, directly threatening team sustainability and developers' careers.

  • Every week without Retrofit expertise amplifies these risks, turning opportunities into costly disasters.

Imed BEN AMOR, Learni trainer · Development expert
Imed BEN AMOR

Learni trainer · Development expert

73%productivity gap
×3cost of inaction
Flag of the United StatesBuilt for US teams
Payment by wire transferEnhanced confidentialityPerfect for companies with 50 to 500 employeesScheduling to fit any time zone

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Companies: Aptar, ArcelorMittal, Equans, EDF, Ubisoft and Microsoft.

Retrofit training objectives

  • Understand how Retrofit works and its advantages
  • Configure Retrofit in an Android project
  • Perform HTTP requests (GET, POST, PUT, DELETE) with Retrofit
  • Handle JSON responses and integrate Gson/Moshi
  • Use interceptors and error handling
  • Master authentication, complex requests, and pagination
  • Apply best practices for consuming RESTful APIs in Android

Retrofit curriculum: 3 modules over 2 days

Module 1 : Introduction, installation and configuration of Retrofit

Presentation of Retrofit, installation via Gradle, initial configurations, REST architecture, overview of useful annotations, implementation of your first API interface, code structuring.

Module 2 : HTTP Requests, JSON Parsers, Responses and Errors

Performing GET/POST/PUT/DELETE requests, using Gson and Moshi for JSON parsing, response structures, handling network and HTTP errors, introduction to CallAdapter and interception, presentation of LiveData or Coroutines.

Module 3 : Advanced Integration, Authentication and Best Practices

Securing requests (OAuth/JWT), managing headers and tokens, advanced requests (multi-part, file uploads), pagination, custom interceptors, logging, optimization, robust code patterns, maintaining and testing API integrations in a real project.

How Retrofit skills are assessed

  • Final MCQ on understanding Retrofit concepts
  • Practical project integrating a public REST API into an Android application
  • Personalized corrections

How the Retrofit course is taught

  • Interactive courses and live code demonstrations
  • Practical case studies and workshops
  • PDF course materials, code examples, access to a dedicated GitHub repository

Retrofit training: access and practical arrangements

The Training: Mastering Retrofit - Harness the Power of REST APIs for Android program is delivered onsite or remote (blended-learning, virtual classroom, remote presence). At Learni, an industry-certified training organization, every program is built to maximize skills acquisition regardless of the chosen format.

The trainer alternates between demonstrative, interrogative and active methods (through hands-on labs and/or scenarios). This pedagogical approach guarantees concrete learning that's immediately applicable at work.

Equipment required

For the smooth delivery of the Training: Mastering Retrofit - Harness the Power of REST APIs for Android program, the following equipment is required:

  • Mac or PC computers, high-speed fiber internet, whiteboard or flipchart, projector or interactive touch screen (for remote sessions)
  • Training environments installed on workstations or accessible online
  • Course materials, hands-on exercises and complementary resources
  • Post-training access to materials and educational resources

For intra-company training on a site outside Learni, the client commits to providing all required teaching materials (computers, internet, etc.) for the smooth delivery of the program in line with the prerequisites in the communicated program.

* contact us for remote delivery feasibility** ratio varies depending on the program

Skills assessment methods

Assessment of skills acquired during the Training: Mastering Retrofit - Harness the Power of REST APIs for Android program is performed through:

  • During training: case studies, hands-on labs and professional scenarios
  • End of training: self-assessment questionnaire and skills evaluation by the trainer
  • After training: completion certificate detailing acquired skills

Program accessibility

Learni is committed to making its programs accessible. All our programs are accessible to people with disabilities. Our teams are available to adapt the pedagogical methods to your specific needs. Please contact us for any adjustment request.

Enrollment terms and lead times

Registration is possible up to 48 business hours before the start of training. All our programs are built for corporate L&D budgets and delivered onsite or remotely.

The Learni story

Founded by engineers and learning experts, Learni's mission is to make high-impact tech training accessible to teams everywhere. We work remotely with organizations across the US and Canada, in your time zone, to help teams upskill fast.

Our method

How Learni guarantees the quality of your Retrofit training

Before, during, after: we frame the brief, introduce the trainer, tailor the content and measure impact. You stay in control from kickoff to wrap-up.

Step 1

Rigorous trainer selection

Each trainer is validated on three criteria: hands-on field expertise, proven pedagogy and alignment with your industry.

  • Triple validation: technical, pedagogical, sectoral.
  • Minimum rating 4.8/5 over the last 12 sessions.
Step 2

You meet the trainer beforehand

30-minute video call between you and the selected trainer to validate the fit, adjust content and clear any final doubts.

  • Live briefing on goals and team context.
  • Veto right — we swap the trainer for free if needed.
Step 3

Content tailored to your context

No recycled slides. The syllabus is reworked from your real cases: tools, constraints, vocabulary, ongoing projects.

  • Hands-on cases drawn from your stack and projects.
  • Program co-written then validated by your team.
Step 4

Continuous quality follow-up

Live evaluations, 30/90/180-day check-ins and a consolidation plan. If the impact misses the mark, we rework it.

  • NPS, knowledge quizzes and skills self-assessment.
  • Satisfaction guarantee: fully satisfied or free rework.

A simple promise: you don't pay to discover the trainer on day one. Everything is validated upfront, by you.

A child walking to school with a backpack
Our social commitment

A school kit donated to a child for every training booked

To fight inequalities in access to education, Learni donates a complete school kit to a child in need for every training booked. You build your skills, a child heads back to school.

  • Backpack, notebooks and essential supplies
  • Distributed through our partner charities
  • Included, at no extra cost to you
Enroll and offer a kit
FAQ

Retrofit: frequently asked questions

What can participants do after Training: Mastering Retrofit training?+
They can understand how Retrofit works and its advantages, configure Retrofit in an Android project and perform HTTP requests (GET, POST, PUT, DELETE) with Retrofit. Those are the stated objectives of the Training: Mastering Retrofit program at Intermediate level, checked by the end-of-session assessment.
What does the Training: Mastering Retrofit program cover, day by day?+
Day 1: Introduction, installation and configuration of Retrofit. Day 2: HTTP Requests, JSON Parsers, Responses and Errors. Day 3: Advanced Integration, Authentication and Best Practices. The Training: Mastering Retrofit program runs over 2 days, delivered on site.
How is Training: Mastering Retrofit training assessed?+
Assessment relies on final MCQ on understanding Retrofit concepts, practical project integrating a public REST API into an Android application and personalized corrections. Learni issues a completion certificate together with the individual assessment report at the end of the Training: Mastering Retrofit program, which an L&D team can file as evidence.
How much does Training: Mastering Retrofit training cost per participant?+
Training: Mastering Retrofit training costs $2,310 per participant. For an in-company team, the flat rate starts at $4,190 for the whole group, up to 8 people. The detailed quote, sent within one business day, adjusts the amount to the format and how far the syllabus is tailored to your team.
How long does Training: Mastering Retrofit training take?+
2 days, available live online (US time zones) or on-site at your offices. Half-day tracks spread over several weeks are possible so the team stays operational.
Who pays for Training: Mastering Retrofit training?+
Most US teams pay directly through their company L&D or training budget. Learni invoices in US dollars and accepts bank transfer (ACH/wire) or card, with volume pricing for teams. A purchase order is welcome.
What do participants need to know before Training: Mastering Retrofit training?+
Basic knowledge of Android development and the Java or Kotlin language.
Is a certificate issued after Training: Mastering Retrofit training?+
Yes. A Learni completion certificate is issued, along with the individual evaluation report. Learni is a certified training provider and prepares for third-party certifications, but does not award them itself.
Does Learni provide the equipment for Training: Mastering Retrofit training?+
No. A computer and a stable internet connection are required for each participant. Learni provides the learning platform, the trainer and all course materials.
Your professional training, anywhere

Let's build your Retrofit learning path.

30 minutes with a learning advisor. No commitment. No sales pitch dressed up as a demo.

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