Revan4Android

A Hard Truth for Android Developers: If We Don’t Evolve Now, We’ll Be Left Behind.   Back in 2015, I helped launch an Android app that looked beautiful and worked flawlessly — as long as the user had a perfect internet connection. We shipped it, celebrated… Then came the crash. In low-connectivity markets, users dropped off. Reviews tanked.  Engagement plummeted. Why? Because we built Online-First , not Offline-Ready . We were late to realize:  Users expect apps to work anytime, anywhere. Offline-First isn’t a feature — it’s a survival strategy. We rebuilt from scratch. Local storage. Sync queues. Background workers. It saved us — barely. Fast forward to 2020. We tried adding AI — smart recommendations, content tagging, predictive inputs. But we added it too late . It wasn’t integrated, it wasn’t fast, and it wasn’t smart enough. Now in 2025? That kind of thinking is a death sentence for your app. Today’s users expect: On-device intelligence Real-time pers...

“If we don’t evolve how we build Android apps today, we won’t just fall behind — we’ll disappear.” That may sound dramatic, but it’s real. I’ve lived through each wave of Android’s evolution — from when we blindly assumed users were always connected, to now, where failing to integrate AI at the core of your product means you’re building for a version of Android that no longer exists. This is the story of how Android development has changed — and why this moment is a make-or-break opportunity. When Online-First Nearly Sank Our App In 2015, I was part of a team that launched a feature-rich, well-designed Android app. It passed all the tests — smooth UX, real-time data, clean API usage. But we made one crucial mistake: We assumed users would always be online. It worked fine in big cities. But when we rolled out in regions with poor connectivity? The app practically died. No content. Spinning loaders. Silent crashes. We learned the hard way: Online-first doesn’t scale. Offline-first ...

Jetpack Compose has revolutionized Android UI development with a modern, declarative approach. Whether you’re preparing for interviews, brushing up on fundamentals, or building real-world apps, mastering components like Text , Image , Column , and Card is essential. In this article, you’ll find 40+  questions and answers , structured by experience level — Beginner , Intermediate , and Advanced . Each section gives you the theory and the how-to for practical usage. Let’s dive in. Beginner Level – Laying the Foundation If you're just starting out with Jetpack Compose, these questions will help you get comfortable with how to build basic layouts using Text , Image , Column , and Card . Text Text is the most basic composable — used to display string content with styling, color, and alignment. Q: How do you display a simple text in Jetpack Compose? A: Use Text("Hello World") . Q: How do you change the font size of text? A: Use fontSize = 20.sp . Q: How do ...

Imagine opening an app that knows exactly what you want, before you even tap a button. Now imagine a smartwatch that gently buzzes to suggest a break—because it noticed your stress level rising. This isn’t sci-fi. It’s the power of AI in Android and Wear OS , already reshaping how we interact with our devices—whether in our hands or strapped to our wrists. If you’re a developer, creator, or just a curious tech lover, this post will show you how AI is transforming mobile and wearable apps—and how you can tap into that power. Why AI? And Why Now? Because static apps are boring. Today’s users expect apps that learn, adapt, and respond in real time. They want smarter cameras, personalized content, and tools that feel like they’re listening . Thanks to major strides in on-device machine learning, Android and Wear OS developers now have everything they need to build intelligent, real-time features right into their apps—no cloud required. 5 Ways AI is Making Android Smarter 1. Pers...

  Tame large files and streamline your development workflow with Git Large File Storage (LFS) If you're an Android developer building feature-rich apps with stunning graphics, on-device machine learning, or immersive media — chances are you've bumped into Git’s limitations. From high-res images and videos to .tflite models and APKs, large files can seriously slow down your Git repo, mess with version control, and frustrate your team. That’s where Git Large File Storage (LFS) comes in. In this post, you'll learn how Git LFS helps Android developers manage large assets more efficiently, avoid Git pitfalls, and deliver faster, cleaner projects. Why Android Projects Need Git LFS Modern Android apps aren’t just about code — they’re rich experiences powered by assets: Images and animations for splash screens, UI elements, and AR Audio and video files for e-learning, podcasts, or games Machine learning models for features like face detection or text translatio...

  Seamless network awareness in your app, the MVVM way. Why This Matters Modern mobile apps live and die by network connectivity. Yet, Android’s ConnectivityManager.NetworkCallback often misses reconnection events or fails silently on some devices. The result? Your app gets stuck “offline” even when the internet is back. In this guide, we’ll show how to build a reliable, MVVM-aligned connectivity observer that’s: Lifecycle-safe with StateFlow Jetpack Compose-compatible Reactive using callbackFlow + polling Completely decoupled via ViewModel Architecture Breakdown View (Compose UI) ↕ ViewModel (StateFlow) ↕ ConnectivityObserver (Flow of Status) 1. Define the ConnectivityObserver Interface (Model Layer) interface ConnectivityObserver { enum class Status { Available, Unavailable, Losing, Lost } fun observe(): Flow<Status> } 2. Implement the NetworkConnectivityObserver (Model Layer) class NetworkConnectivityObserver(p...

“What if your app never failed — even when the network did?” You tap Submit . You're on a weak 3G signal. The request hangs... times out... and fails silently. The user is frustrated. The data is lost. This is exactly what we’re going to fix today. The Real-World Challenge Most apps assume: The user is online The network is fast The API request will succeed — or at least fail quickly But real mobile users face: Slow, unreliable connections Network dropouts mid-request Expired access tokens Limited battery and data Let’s build an Android app architecture that: Detects slow internet before the API call Retries intelligently using RetryInterceptor Defers failures to WorkManager Refreshes tokens using Mutex Shows clean Compose UI feedback The Hybrid Strategy: Retry Smart, Retry Forever We'll combine: ✅ RetryInterceptor Fast, foreground retry Handles transient failures (timeouts, connection issues) Retries 3 times w...

Handling API errors might sound boring — but it’s where user trust is either won or lost. Whether it’s a 404, a network drop, or an unknown crash, how your app responds matters. In Jetpack Compose, we often nail the UI but forget to handle these issues gracefully . That’s why today we’re building a robust, reusable error-handling system that: Shows friendly messages instead of raw errors Keeps your ViewModels clean Is scalable for real-world apps Let’s get into it. Why Is This Important? Imagine this: "java.net.UnknownHostException: Unable to resolve host..." Now compare: "No internet connection. Please check your network." With clean error handling, you get: Happy users who understand what's wrong Clean architecture without messy try-catch everywhere Better maintainability when things grow Step 1: Create a Flexible Result Wrapper This gives us a consistent way to handle API state (loading, success, error). sealed class Resource...

Everything you need to know about managing state in Jetpack Compose — with beginner to advanced Q&A to help you master reactive UIs. Jetpack Compose is changing how Android apps are built, thanks to its declarative, reactive UI model. But there’s one concept that underpins it all — state . If your UI isn’t updating as expected, or if you're confused about when to use remember , ViewModel , or rememberSaveable , you’re not alone. This guide walks through the core concepts , shows real code examples , and answers 30+ real-world questions for developers at all levels. What Is State in Jetpack Compose? In Jetpack Compose, state is any value that can change over time and causes the UI to recompose when it does. Examples: The number in a counter The text in a field A toggle’s on/off state Jetpack Compose uses state-driven recomposition , which means that the UI automatically updates when the state changes . Core State Tools in Compose mutableStateOf Used to c...

Building scalable Android apps requires clean architecture—and one of the best ways to manage your UI and logic is by combining MVVM with Jetpack Compose . However, API calls can get messy when not structured properly. In this post, I’ll show you how to build a reusable, clean API call structure using MVVM that works for any screen in your app. We'll use: ViewModel to manage UI-related data Repository for business logic and network State management using mutableStateOf Retrofit for networking This is not tied to any specific screen (like sliders, onboarding, etc.)—you can plug in your own model and API. Why a Reusable Pattern? Apps often repeat the same logic: Show loader Fetch data Handle errors Update UI Instead of repeating it everywhere, we'll abstract it once and just extend or plug in what’s needed per screen. 1. Define a Generic API Result Wrapper This wrapper lets us handle success, loading, and error states in a consisten...