Android

Becoming an Android developer in 2026 is different from five years ago. XML layouts are gone. Java is optional. The modern Android stack is Kotlin, Jetpack Compose, and coroutines. This roadmap gives you a clear path from zero to job-ready. It covers what to learn, in what order, and how long each stage takes. Whether you are a complete beginner or switching from another platform, this guide will save you months of confusion. ...

Android interviews in 2026 focus on Jetpack Compose, Kotlin coroutines, and modern architecture. The old questions about XML layouts and AsyncTask are mostly gone. This guide covers the 30 most common Android interview questions. Each answer is short and practical. Questions are grouped by difficulty level: Beginner, Intermediate, and Advanced. Quick Reference — Modern Android Stack (2026) Component Old Way Modern Way (2026) UI XML Layouts Jetpack Compose Navigation Fragment transactions Navigation Compose State management LiveData StateFlow + Compose State Async work AsyncTask / RxJava Kotlin Coroutines + Flow DI Dagger 2 Hilt / Koin Database SQLite / Cursor Room Networking Volley Retrofit / Ktor Image loading Picasso Coil Architecture MVC / MVP MVVM / MVI Beginner Questions (1-10) 1. What are the four main Android components? The four main components are Activity (screens), Service (background work), BroadcastReceiver (system events), and ContentProvider (shared data). Each component has its own lifecycle. They are declared in the AndroidManifest.xml file. ...

Your app launches in 3 seconds. Users see a white screen. They close the app. Your retention drops. Performance is not optional. Google Play ranks apps by performance metrics. Users uninstall apps that feel slow. The difference between a 1-second and 3-second startup can be a 50% drop in engagement. In this tutorial — the final one in the series — you will learn how to measure and optimize your app’s performance using Baseline Profiles, Macrobenchmark, and modern profiling tools. ...

You built the app. You tested it. CI/CD is set up. Now it is time to put it in front of real users. Publishing to the Play Store involves more than clicking “Upload.” You need to sign the app correctly, write a compelling store listing, take good screenshots, and understand how ASO (App Store Optimization) works. In this tutorial, you will learn the complete publishing process — from creating a developer account to staged rollouts. ...

You push code. Tests run automatically. The App Bundle (AAB) is built and signed. It gets uploaded to the Play Store internal track. You never touch the build machine. This is CI/CD — Continuous Integration and Continuous Deployment. It saves hours of manual work and catches bugs before they reach users. In this tutorial, you will set up a complete CI/CD pipeline for your Android app using GitHub Actions and Fastlane. ...

Firebase gives your Android app superpowers. User authentication in minutes. Crash reports that show exactly what happened. Analytics that track user behavior. Feature flags that let you change app behavior without an update. In this tutorial, you will integrate the most important Firebase services into your Android app — Authentication, Crashlytics, Analytics, Remote Config, Cloud Messaging, and App Check. Prerequisites: You should have a working Android app with Hilt. See Android Tutorial #2: Hilt if needed. ...

You built the app. It works. But before you ship it, you need to think about security. Can someone decompile your APK and read your code? Is the user’s data safe? Can a man-in-the-middle attack steal API tokens? In this tutorial, you will learn how to protect your Android app — from code shrinking with R8 to biometric authentication and encrypted storage. Prerequisites: You should have a working Android app. If you have been following this series, you already have everything you need. ...

Widgets live on the home screen. They show information at a glance — weather, tasks, calendar events, music controls. Users love them because they don’t have to open the app. Building widgets used to mean writing XML RemoteViews. It was painful. Jetpack Glance changed this. Glance lets you build widgets with a Compose-like API. In this tutorial, you will learn how to build widgets with Glance — from a simple text widget to a task list widget that loads data from Room. ...

A user clicks a link on Twitter. Instead of opening a web page, your app opens directly to the product detail screen. Another user scans a QR code and lands on the signup page inside your app. This is what deep links do. They let URLs open specific screens in your app. In this tutorial, you will learn the difference between deep links and App Links, how to set up both, and how to integrate them with Compose Navigation. ...

Your app needs to pick a photo from the gallery. Or save a file that other apps can open. Or read contacts. All of these go through Android’s storage and content provider system. The way Android handles file access has changed significantly. Scoped storage, the photo picker, and MediaStore have replaced the old “read everything on the device” approach. In this tutorial, you will learn how to work with files, media, and content providers the modern way. ...