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Sergio Sastre @sergio-sastre.bsky.social · 09/06/2026

🚀 AndroidUiTestingUtils 2.9.0 is out! 🆕 What's new! - Add ColorContrastTestRule for instrumentation tests - Add OutlineTextTestRule for instrumentation tests ⚙️ CrossLibrary - Add support for Dropshots 0.6.0 + rootScreenshotDir option 👉 github.com/sergio-sastr...

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Sergio Sastre @sergio-sastre.bsky.social · 08/04/2026

I just released the first part of „Refactoring with Gemini in Android Studio - Behavior Tests as Guardrails“ on my YouTube channel! I explain what refactoring actually is, why it matters with AI & why Behavior Tests are so important. Part 2 already in the making! 🏗️ m.youtube.com/watch?v=3v2l...

m.youtube.com

Refactoring with Gemini in Android Studio (Part 1) – Using Behavior Tests as Guardrails

YouTube video by Sergio Sastre

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Sergio Sastre @sergio-sastre.bsky.social · 11/02/2026

🚀 I've started a new YouTube channel on Android development with AI, and the first video is out! Generate Android Code from Pull Request Comments with GitHub MCP + Gemini Hope somebody finds it useful 😊 www.youtube.com/watch?v=nEoc...

youtube.com

Generate Android Code from Pull Request Comments with GitHub MCP + Gemini

YouTube video by Sergio Sastre

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Sergio Sastre @sergio-sastre.bsky.social · 18/12/2025

🎉 𝐂𝐨𝐦𝐩𝐨𝐬𝐚𝐛𝐥𝐞𝐏𝐫𝐞𝐯𝐢𝐞𝐰𝐒𝐜𝐚𝐧𝐧𝐞𝐫 0.8.0 𝐢𝐬 𝐨𝐮𝐭! github.com/sergio-sastr... This release brings 𝑪𝒐𝒎𝒑𝒐𝒔𝒆 𝑴𝒖𝒍𝒕𝒊𝒑𝒍𝒂𝒕𝒇𝒐𝒓𝒎 𝒔𝒖𝒑𝒑𝒐𝒓𝒕 to the next level 🚀 You can now scan Android @Previews on desktop and JVM, which is supported thanks to CMP’s commonised @Preview (≥ 1.10.0-beta02).

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Sergio Sastre @sergio-sastre.bsky.social · 27/11/2025

🚀 𝐀𝐧𝐝𝐫𝐨𝐢𝐝𝐔𝐢𝐓𝐞𝐬𝐭𝐢𝐧𝐠𝐔𝐭𝐢𝐥𝐬 2.8.0 𝐢𝐬 𝐡𝐞𝐫𝐞! github.com/sergio-sastr... 🎉 It brings 𝘧𝘶𝘭𝘭 𝘍𝘰𝘯𝘵𝘞𝘦𝘪𝘨𝘩𝘵 𝘴𝘶𝘱𝘱𝘰𝘳𝘵 including Roborazzi & cross-library screenshot tests for any UI component: ✅ Activity ✅ Fragment ✅ View ✅ Composable

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Sergio Sastre @sergio-sastre.bsky.social · 04/11/2025

👨‍💻My droidcon talk „Let‘s @Preview the future: Automating Screenshot Testing in CMP“ is out! 👇 www.youtube.com/embed/zYsNXr... I covered Preview Screenshot Testing for ✅ Android (including animations) ✅ Desktop ✅ Common Hope you enjoy it almost as much as I did! #dcbln25

m.youtube.com

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Sergio Sastre @sergio-sastre.bsky.social · 21/10/2025

🛝 Just updated the 𝗔𝗻𝗱𝗿𝗼𝗶𝗱 𝗦𝗰𝗿𝗲𝗲𝗻𝘀𝗵𝗼𝘁 𝗧𝗲𝘀𝘁𝗶𝗻𝗴 𝗣𝗹𝗮𝘆𝗴𝗿𝗼𝘂𝗻𝗱! All the libraries are now on their 𝒍𝒂𝒕𝒆𝒔𝒕 𝒗𝒆𝒓𝒔𝒊𝒐𝒏𝒔, so you can try screenshot testing with the most up-to-date tools! 👉 github.com/sergio-sastr... #AndroidDev #Testing

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Sergio Sastre @sergio-sastre.bsky.social · 23/09/2025

See you tomorrow @droidcon.bsky.social where I‘ll be talking about 📸 Automating Screenshot testing in CMP with @Previews youtube.com/shorts/q5Kmx... Just right after the keynote 😉

youtube.com

📸 Automating Screenshot Tests | Sergio Sastre Flórez at droidcon Berlin 2025

YouTube video by droidcon & fluttercon

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Sergio Sastre @sergio-sastre.bsky.social · 08/09/2025

Thanks to everybody who attended my talk at Droidcon Lisbon! 🔎 Let's @Preview the future: Automating Screenshot Testing in CMP It was a blast! You can already find the slides in my SpeakerDeck👇 speakerdeck.com/gio_sastre/l... ...or even better, watch me live at Droidcon Berlin in a few weeks! 😉

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Sergio Sastre @sergio-sastre.bsky.social · 02/09/2025

🇵🇹 Super excited to be talking at Droidcon Lisbon in 2 days again! I’ll start with a quick screenshot testing intro & then take on the challenge: ⚡️ In ~20 mins of live coding, I’ll spin up automated screenshot tests from Compose Previews: Android, Desktop & Common. Let’s make it happen 💪

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Sergio Sastre @sergio-sastre.bsky.social · 18/08/2025

🔥 ComposablePreviewScanner 0.7.0 is out! It packs 2 new features: ✅ Supports Glance Previews, helping auto-generate screenshot tests from them with any screenshot testing library ✅ Same for Compose Multiplatform Previews in common code Give it a try👇 github.com/sergio-sastr...

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Márton Braun @zsmb.co · 29/07/2025

Did you know you can use Compose previews with Compose Multiplatform now? I wrote a quick blog post about how to get started with them. zsmb.co/compose-mult...

zsmb.co

Setting up Compose Multiplatform previews

Compose Multiplatform now has support for previews in common code. Here's how you can get started with using them.

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droidcon @droidcon.bsky.social · 17/07/2025

🥁 Big news! The first batch of speakers for #dcbln25 are LIVE — & we’re kicking things off with a banger ⚙️ @marcinmoskala.bsky.social goes over how to master async debugging in #Kotlin – learn to fix #coroutine bugs, boost performance & avoid pitfalls in #Android berlin.droidcon.com/speakers/mar...

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István Juhos @istvanjuhos.dev · 30/05/2025

#mDevCamp 2025 is just around the corner! Swing by the Concrete Break room next Tuesday afternoon — I’ll be sharing some practical tips & tricks for working with Compose Multiplatform Previews. See you there! 😉 mdevcamp.eu/schedule...

mdevcamp.eu

mDevCamp 2025

Join the 11th International Conference for Mobile Developers on June 2-3, 2025, at Holešovice Market. Connect, learn, and experience the future of mobile development!

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Sergio Sastre @sergio-sastre.bsky.social · 26/05/2025

I'll be giving my first talk of the year for the Kotlin User Group Munich, at Google offices. This time I'll talk about Screenshot Testing in CMP with some live coding! There's already a waiting list, but if you're joining, come to say hello! www.meetup.com/kotlin-user-...

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Sergio Sastre @sergio-sastre.bsky.social · 21/04/2025

Nothing better than sports to help with your physical and mental health… This session I was on fire 🔥🔥🔥 Although it took me a while to warm up, once I turned on the camera I did not fail any trick, except the last one, which took me around 5 attempts

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Sergio Sastre @sergio-sastre.bsky.social · 17/04/2025

1. Team does not meet sprint goals often, but never misses a deadline and has very low bug rate 2. Team meets all sprint goals, but misses deadlines sometimes and has noticeable bug rates. The main reason why I dislike Scrum A LOT is because it favours working like team 2. Don‘t be team 2 🙏

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Jorge Castillo @jorgecastillo.dev · 15/04/2025

Unit testing each class of a system in isolation sounds good in theory: It ensures each piece works on its own. The hard truth is that it’s a practice that normally produces almost no value 🤷‍♂️ But it is even worse: it creates a false sense of safety and swallows lots of time from developers 🧵

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Sergio Sastre @sergio-sastre.bsky.social · 08/04/2025

Celebrating 10 years married! 🎉 A walk through Olympia Park, a slice of cake, and a reminder that the little moments are the big ones ❤️

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Amanda Hinchman-Dominguez @amanda-hinchman.bsky.social · 06/04/2025

It's a double feature this week 🤠 - Medium: Debugging Coroutines in IntelliJ and Android Studio - Spotify: Kotlin Khronicles ep2 Thanks @kotlinweekly.bsky.social for bringing together the global community 💯

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midudev · Miguel Ángel Durán @midu.dev · 03/04/2025

Un gran desarrollador no es quien sabe más lenguajes o frameworks. Es quien convierte problemas complejos en soluciones sencillas.

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Sergio Sastre @sergio-sastre.bsky.social · 03/04/2025

Now that Android Studio Narwahl is out…Do you know that you can also auto-generate screenshot tests from @Previews in “common” using 𝐂𝐨𝐦𝐩𝐨𝐬𝐚𝐛𝐥𝐞𝐏𝐫𝐞𝐯𝐢𝐞𝐰𝐒𝐜𝐚𝐧𝐧𝐞𝐫 ? github.com/sergio-sastr... There is already an executable example in the 𝐑𝐨𝐛𝐨𝐫𝐚𝐳𝐳𝐢 library 👇 github.com/sergio-sastr...

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Jay Shortway @jay.shortway.io · 02/04/2025

Come join @skydoves.bsky.social, myself and the rest of the team to help apps make more money! 🙌

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Sergio Sastre @sergio-sastre.bsky.social · 28/03/2025

I’ve been using🔥Firebender AS plugin for coding in Android and oh man, first time I truely believe there is a useful AI tool for Android development🙏 I strongly recommend to give it a try firebender.com

firebender.com

Firebender - Most powerful AI assistant in Android Studio

Write code 10x faster with Firebender, the most powerful AI assistant for Android Studio.

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Sergio Sastre @sergio-sastre.bsky.social · 22/03/2025

𝗪𝗼𝗻𝗱𝗲𝗿𝗶𝗻𝗴 𝗵𝗼𝘄 𝘁𝗼 𝘁𝗲𝘀𝘁 𝗨𝗶 𝗔𝗻𝗶𝗺𝗮𝘁𝗶𝗼𝗻𝘀 𝗱𝗶𝗿𝗲𝗰𝘁𝗹𝘆 𝗳𝗿𝗼𝗺 @𝗣𝗿𝗲𝘃𝗶𝗲𝘄𝘀? Look no further… 🤖 Roborazzi 1.44.0-alpha01 is out! github.com/takahirom/ro... 🧪This is something experimental and @takahirom.bsky.social and I would love to hear your feedback to shape its api!

github.com

Release 1.44.0-alpha01 · takahirom/roborazzi

Why is this an alpha release? We don't usually release an alpha version. This release serves as a base implementation for future versions, allowing us to test whether this approach works well acros...

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Alex Zhukovich @alexzh.com · 20/03/2025

Code Review Tip: When building UI-related features, include screenshots and/or a short demo video to your PR. This dramatically simplifies the review process as visual context helps catch design inconsistencies that might be missed in a code-only review.

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Sergio Sastre @sergio-sastre.bsky.social · 06/03/2025

Hello from Kuala Lumpur 🇲🇾!

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Alex Zhukovich @alexzh.com · 27/02/2025

1/4 Stop writing endless screenshot tests. Android developers waste hours writing almost identical screenshot tests. Here’s a tip to write less code without compromising coverage: • Replace multiple test cases with parameterized tests • Configure valid input parameters for every test

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Maryam | مريم 🤖 @mal7othify.bsky.social · 23/02/2025

There is a lot of buzz about DeepSeek models and their efficiency. I tried them and oh my! They're very good! I use them for coding and other stuff as well. I wrote this blog to help you integrate the model locally for FREE. Enjoy coding! 🚀 🔗: www.mal7othify.com/post/deepsee...

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Sergio Sastre @sergio-sastre.bsky.social · 23/02/2025

I’ve upgraded examples in 🛝Android Screenshot testing playground to newer versions: ✅ AndroidUiTestingUtils 1.5.0 -> 1.6.0 ✅ Paparazzi 1.3.4 -> 1.3.5 ✅ Roborazzi 1.26.0 -> 1.41.1 ✅ Compose Screenshot alpha07 -> alpha08 Check it out 👇 github.com/sergio-sastr...

github.com

GitHub - sergio-sastre/Android-screenshot-testing-playground: A sample repo to introduce screenshot testing in Android with different libraries

A sample repo to introduce screenshot testing in Android with different libraries - sergio-sastre/Android-screenshot-testing-playground

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Sinan Kozak @sinankozak.bsky.social · 22/02/2025

The last couple of lint rules I wrote have caught multiple violations this week and already saved valuable review times and possible mistakes. I love seeing results of checks.

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Sergio Sastre @sergio-sastre.bsky.social · 14/02/2025

Lately I’ve seen & suffered the consequences of teams not discussing out requirements that added too much complexity for very little value for the user. The best engineers I’ve worked with always tried to avoid complexity not to build 💩 on 💩 & that is way more important than being technically great

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Sergio Sastre @sergio-sastre.bsky.social · 07/02/2025

Why some devs ❤️ to write unnecessary overcomplicated solutions? These’re the 1st that shoot back, with side victims. Your features were using that api, they changed internals without informing & suddenly you get a bunch of 🐞 & stress. This has been the most stressful week in 11 years as dev KISS

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Sergio Sastre @sergio-sastre.bsky.social · 30/01/2025

Yesterday I talked with @jovmit.bsky.social’s amazing Android community about: ✅ Fast feedback Loops ✅ How to get them with Previews & Screenshot Tests ✅ Demo on how to integrate Composable Preview Scanner with Paparazzi to auto-generate Screenshot Tests out of Previews Links below 👇

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Sergio Sastre @sergio-sastre.bsky.social · 26/01/2025

I was watching yesterday‘s match with my dear „blog post“ reviewer Pablo, a Real Madrid fan. Still hard to believe Real Valladolid promoted to La Liga last year… Happy at least that they could show they have not „surrendered“ yet… although it was 0-3 against 😅

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Sergio Sastre @sergio-sastre.bsky.social · 20/01/2025

A very important thing when implementing a library: ❌ Meaningful error messages Today Hilt was complaining about a “missing Provides method” It was mega misleading, since it had to do with a variable not having the right scope… 🙏 Please, never implement error messages like in Dagger…

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Sam Edwards @handstandsam.bsky.social · 15/01/2025

Just published a post about the tests_regex instrumentation argument for Android UI Tests. handstandsam.com/2025/01/15/r... #android #testing

handstandsam.com

Running Specific Android UI Tests using TestParameterInjector via a Regex – Handstand Sam

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Sergio Sastre @sergio-sastre.bsky.social · 14/01/2025

Let’s say the “architect” of your project, made up of 4 teams, tells you that he’d like we write more integration tests with Appium and get rid of the redundant unit tests. Your team seems to be the only one against, argumenting that it hinders “fast feeback” loops… What would you do in this case?

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Aurimas Liutikas @liutikas.net · 13/01/2025

Have you ever wanted to be evil and start using `internal` types of a Kotlin library? You totally can and here is how www.liutikas.net/2025/01/12/K... Also, if you do this to AndroidX libraries we'll 100% break you! #kotlin #gradle

liutikas.net

Kotlin Library Friends - Using the Internals

Let’s say there is a library out there that has a very useful internal method inside of it.

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Sergio Sastre @sergio-sastre.bsky.social · 12/01/2025

ComposablePreviewScanner 0.5.0 is out! github.com/sergio-sastr... If you find any issue, feel free to report it 😊

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