Author name: Catalin Prata

Born in Alba Iulia, a beautiful city from Romania. I like hiking and everything related with electronics and IT . Eager to learn and enhance my knowledge in programming languages. My main specialization is on Mobile Applications development (Android and iOS).

Articles

Structured AI Development for Android: A Complete Workflow from Design to Play Store

Why Unstructured AI Coding Fails for Android Projects You open your AI coding agent, type “add a settings screen with dark mode toggle,” and the agent immediately starts writing code. Three minutes later, it’s generated a SettingsActivity with XML layouts — except your app uses single-activity Compose navigation. It didn’t check your architecture. It didn’t […]

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Tutorials

Running Gemini Nano On-Device: Your First Android AI Feature Without a Server

Why On-Device AI Matters for Android Developers Every AI feature you ship today probably depends on a network call. The user types something, your app hits an API, waits for a response, and displays the result. It works, but it comes with latency, server costs, and the uncomfortable fact that your app is useless without

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A terminal window showing the Claude Code interface performing an automated Android code review on Kotlin files, highlighting critical issues like memory leaks and coroutine safety.
Tutorials

Android Code Review Workflow With Claude Code: Catch Bugs Before Your Teammates Do

The Gap That Claude Code Fills in Code Review Code review is one of the most valuable things a team does — and one of the most time-consuming. Reviewers catch real bugs, but they also spend energy on things that could be automated: spotting forgotten null checks, flagging coroutine scope misuse, noticing that a ViewModel

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Snippets

Kotlin Contracts: Teach Your Compiler About Your Function’s Behavior

What Are Kotlin Contracts? If you’ve worked with Kotlin for a while, you’ve likely encountered functions from the standard library that seem to have almost magical powers. Take require() and check()—call them with a condition, and the compiler somehow knows that if execution continues past that line, your variable is no longer nullable. Or use

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Tutorials

Dynamic Theme Your App with Android WallpaperColors API

What Is the WallpaperColors API? Android 8.1 (API 27) introduced the WallpaperColors API, and it remains one of the most underrated tools for building personalized Android experiences. It lets you extract the dominant, secondary, and tertiary colors from your user’s system wallpaper and apply them to your app’s theme in real time. On Android 12+

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The best of both worlds: The type safety of a wrapper class with the zero-overhead performance of a primitive.
Snippets

Type-Safe Zero-Cost Wrappers with Kotlin Value Classes

The Problem: Primitive Obsession You’ve probably seen this pattern in production code: database IDs represented as Long, user emails as String, currency amounts as Double. On the surface, it’s simple and pragmatic. But it introduces a subtle bug vector—primitive obsession. Imagine you have a function that accepts a user ID and a post ID, both

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Tutorials

Android Keyboard Animation: WindowInsetsAnimation API for Smooth IME Transitions

Why Android Keyboard Animation Matters When your app shows a text input and the soft keyboard slides up, that moment sets the tone for user experience. A jarring jump or a laggy animation feels cheap. A smooth, synchronized transition where your content slides up in perfect sync with the IME (Input Method Editor) feels polished

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Tutorials

Android Choreographer API: Frame Timing, VSYNC, and Smooth 60fps Rendering

What Is the Choreographer API? The Choreographer API is Android’s internal frame timing system — the heartbeat of smooth animation. Every frame your app draws, the Choreographer orchestrates the timing. It synchronizes with the device’s VSYNC signal (the vertical refresh of your screen), and it exposes a callback mechanism so you can hook into that

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Refactoring with AI
Articles

LLM Prompts for Code Refactoring: A Practical Guide

LLM Prompts for Code Refactoring: Structuring Your Requests When you’re facing a large refactoring task in your Android codebase, asking an LLM the right way can save you hours. Unlike simple coding questions, refactoring requires your AI assistant to understand the architectural context, the business logic you’re preserving, and the specific constraints of your project.

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AI assistant concept with code on screen
Articles

Generate Architecture Docs from Code with LLMs

Generate Architecture Documentation Automatically from Your Codebase You know the problem: your app’s architecture documentation is either non-existent, wildly out of date, or buried in scattered wiki pages that nobody reads. By the time you onboard a new developer, they’re confused about module boundaries, data flow, and how components talk to each other. Modern LLMs

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Autumn sunny sunset
Tutorials

Building a Day/Night Sky Gradient System for Android Live Wallpapers

Creating Realistic Sky Gradients That Change With the Sun When you look at a great live wallpaper, what makes it feel alive isn’t just animation — it’s the sky. A static blue-to-orange gradient at the top of your screen feels dead after five minutes. But a sky that actually shifts through dawn blues, golden hours,

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Tutorials

One HTTP Client for Android and iOS: Ktor 3 in a KMP Shared Module

The Networking Problem in KMP Projects Before Kotlin Multiplatform, Android had Retrofit and OkHttp while iOS had URLSession or Alamofire — two completely separate networking stacks, two sets of models to keep in sync, and twice the bugs to chase. KMP solves this at the shared-module level, and Ktor Client is the library built specifically

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Circuit board representing platform layers
Tutorials

expect and actual: The Mechanism That Makes Kotlin Multiplatform Tick

The Core Problem KMP Has to Solve Kotlin Multiplatform lets you share business logic across Android, iOS, desktop, and web — but each platform still has its own APIs. Android has Log, iOS has NSLog, Android has SharedPreferences, iOS has NSUserDefaults. KMP’s answer to this is a two-keyword mechanism: expect and actual. It’s the single

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Code on a dark monitor screen
Tutorials

Kotlin Property Delegates You’re Probably Not Using: observable and vetoable

Why Property Delegates Often Go Unnoticed Most Kotlin developers know lazy — it’s everywhere. You see it in Android ViewModels, dependency injection setups, and library code. But the standard library ships two more property delegates that are surprisingly powerful and almost never discussed: Delegates.observable and Delegates.vetoable. If you’ve been wiring up manual setters or using

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