🚀 Day 0/30: Building a Real Android App for a Client in Public
Today marks the start of a new challenge. For the next 30 days, I'll be building a real Android application for a client and documenting the journey p…
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An AI Module Smaller Than a Smartphone Photo. Are We Underestimating the Computer We Carry Every Day?
The Idea and the Main Engineering Challenges Recently, I released a new offline AI feature for my Android application as a separate module. The entire…
Configuring Firebase AI Logic for Android to Use Gemini Models
What device do we use almost all the time? Our mobile phone, almost certainly. If we wanted to develop mobile apps, we would have wondered how to inte…
I Built a 1 MB Android Widget for DeepSeek AI – Here’s How It Works (and Why You Might Want It)
The problem : I love using DeepSeek AI, but every time I wanted to ask something, I had to: Unlock my phone and then find the DeepSeek app icon , wait…
Injecting WorkManager into ViewModels with Dagger Hilt. No Context, No Boilerplate, Always a WorkQuery Back
WorkManager is the right tool for deferrable, guaranteed background work in Android. But the default setup pushes you toward boilerplate fast: you end…
OpenAPI, ORM, SVG and Lottie
This is the third follow-up to Friday's release post . Saturday's was about how you iterate; yesterday's was about new platform APIs in the core; toda…
🚀 Rebuilding My Android App with Jetpack Compose: The Mailfo v2.0 Journey
Hey DEV community! 👋 I just completely rebuilt and launched Mailfo v2.0 , an privacy-focused temporary disposable email app for Android[cite: 1, 2]. T…
Project Log #1: I'm Building an AI Agent That Controls a Phone
I'm starting a new project. It's the most ambitious thing I've attempted from a phone. The goal: an AI agent that controls a smartphone. It opens apps…
AI, OAuth, And Other Platform APIs In The Core
This is the second follow-up to Friday's release post . It covers the platform APIs that moved into the framework core this release. There are two hea…
On-Device Debugging And JUnit 5
This is the first follow-up to Friday's release post and it covers the two changes from this release that affect how you iterate on a Codename One app…
WebSocket Half-Open Connections and gRPC Gateway Discovery in Complex LAN WebRTC Systems
The target scenario is not consumer calling. It is closer to B2B institutional device fleets: many shared devices, long-running uptime, centralized op…
Scroll Debt: The Anti-Workaround Pattern for App Blockers
The first generation of Android app blockers was, in design terms, a single switch. You set a daily budget, the app cut off the launch when the budget…
Why Mobile Push Notifications Don't Arrive: 3 Critical Reasons
Mobile Push Notifications: Mysterious Disappearances and Technical Realities Mobile push notifications are one of the fastest and most effective ways …
How WhatsApp Works Without Internet: Offline Messaging and Synchronization Explained
Imagine you're traveling on a flight with airplane mode enabled. You type a message to your friend: "Hey, I just landed. Will call you soon." You tap …
Building a Native QR/Barcode Scanner for React Native — New Architecture Ready
Most QR scanner libraries for React Native share the same problems — they're unmaintained, they don't support the New Architecture, or they pull in a …
# Giving an LLM Eyes and Hands on a Mobile Simulator
The interface a human uses When a person does QA in tapflow, the loop is: Look at the simulator screen Decide what to do (tap, swipe, type) Do it Look…
"Reinstalling Won't Fix It": A Cross-App Shared-Auth Deadlock After Switching Phones
After migrating to a new Android phone, a few specific apps stopped launching. Amazon Shopping and Kindle would freeze on a blank white or black scree…
tapflow v0.3.x: Deeplinks, Keyboard Shortcuts, Screenshot API, and an Experimental MCP Server
Deeplink execution from the browser The one that came up most in real usage: testers frequently need to trigger deeplinks to verify specific app state…
Trider – The AI Habit Tracker That Actually Gets You (Free, No Ads)
Why Most Habit Trackers Fail After 2 Weeks You know the pattern: install a habit tracker, go hard for 3 days, miss one day, feel guilty, open the app …
I Built an Android App With Zero Backend — Here's What Happened
I got tired of apps trying to monetize my attention. Notifications, ads, endless feeds — it never stops. So I decided to build an Android app with zer…
The Kimwolf Bust Just Outed Android Webcams as Botnet Fodder — Here's the Question Every Repurposed-Phone Camera Setup Has to Answer
On May 22, 2026, the U.S. Department of Justice announced the arrest of a 23-year-old in Ottawa for allegedly running Kimwolf , a DDoS-for-hire botnet…
I Built a Mac App That Keeps Your Clipboard in Sync Across All Your Android Devices
All tests run on an 8-year-old MacBook Air. I've been building Mac utilities for Android developers for a while now. HiyokoClip is the one I use most …
Vestige: A Gemma 4 Brain Tracker That Won't Blow Smoke Up Your Ass
This is a submission for the Gemma 4 Challenge: Build with Gemma 4 TL;DR What: Vestige —an ADHD-friendly Android app designed to point out the things …
Stop Wasting Tokens on Android Automation
Stop Wasting Tokens on Android Automation Most LLM-driven Android automation starts by showing the model a screen. That sounds reasonable. A human loo…
I Scanned 10 Popular F-Droid Apps With My Security Scanner — Open Source Secure
"It's open source, so it's secure." I hear this all the time. The idea is simple: if the code is public, someone must have reviewed it. Vulnerabilitie…
Gemma 4 on Android: Tricks for Faster On-Device Inference
When I tried building an on-device AI app with Gemma 4, the pitch was clear: model weights on the device, no server, no API calls, works offline. Gett…
AccessLens — a blind person's lanyard, powered by Gemma 4 on-device
This is a submission for the Gemma 4 Challenge: Build with Gemma 4 What I Built AccessLens is an Android app that turns a Pixel 8 worn on a lanyard in…
Skills, Java 17, And Theme Accents
Last week was about Metal and the Skin Designer. This week the headline items are about what a brand new project looks like when you generate it: the …
R8 Minification Silently Killed My Android App's Core Feature (And Tests Didn't Catch It)
My CI pipeline was green. Unit tests passed. The APK built and signed without errors. I installed it on my Pixel 3. The app launched, looked perfect. …
Pragmatic Optimization in Mobile App Size: 3 Misconceptions
The Importance of Pragmatic Optimization in Mobile App Size In the world of mobile app development, I often see that app size plays a critical role in…