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Learn Android Development

Build Android apps with Kotlin and Compose, from first screen to Play Store.

Free to start. Built from a single prompt. No credit card.

Android development is building apps for phones, tablets and other devices running Android. Modern Android apps are written in Kotlin in Android Studio, with interfaces built in Jetpack Compose, a declarative UI toolkit where composable functions describe the screen from state. Around that sits the app architecture Google recommends: ViewModels to hold state across configuration changes, Kotlin coroutines for background work, Room for a local database and Gradle for builds. Older apps use XML layouts and Java, which you may still meet. Learnr builds a personalized Android course from your prompt and teaches it through short, interactive lessons.

How to learn Android Development, step by step

Learn Kotlin basics first. Get comfortable with val and var, null safety, data classes, lambdas and collection functions. Compose code uses lambdas heavily, so Kotlin fluency makes the UI code readable.
Install Android Studio and run on an emulator. Create a new project from the Empty Activity template with Compose, set up a virtual device in the Device Manager, and run the app. Learn to read Logcat when something crashes.
Build layouts with composables. Compose screens from Column, Row, Box, Text, Image, Button and LazyColumn, and learn how Modifier controls size, padding and clicks. Use @Preview functions to iterate quickly.
Handle state and hoist it properly. Use remember and mutableStateOf for local state, then hoist state into a ViewModel so it survives screen rotation. Pass state down and events up as lambdas.
Add navigation, networking and a database. Add Navigation Compose for multiple screens, fetch JSON from an API with Retrofit or Ktor inside coroutines, and cache data with Room. Show loading and error states clearly.
Test on a device and prepare a release. Enable developer options to run on your phone, then build a signed release bundle and learn the Google Play Console steps. Keep Kotlin and Compose concepts fresh with short Learnr lessons.

What you'll learn

Build screens with Jetpack Compose composables and modifiers
Manage UI state with ViewModel and state hoisting
Navigate between screens and handle user input
Load network data with coroutines and store data with Room
Run apps on the emulator and a device and prepare a release build

What's inside your Android Development course

A sample path Learnr builds for Android Development. Your real course adapts to your goal and level.

1. Kotlin essentials for Android
2. Android Studio, the emulator and project structure
3. Jetpack Compose layouts and state
4. Navigation, lists and forms
5. App architecture, networking and Room
6. Testing, release builds and Google Play

How long does it take to learn Android Development?

From zero, expect about 3 to 6 months at 5 to 8 hours a week to build a small app with several screens. Production-quality architecture, testing and Play Store publishing usually take 6 to 12 months of practice. Java or Kotlin experience shortens the start.

What you need before you start

Basic Kotlin, or willingness to learn it alongside. A computer that can run Android Studio and its emulator comfortably; an Android phone is helpful but not required.

Common mistakes to avoid

Following old tutorials built on XML layouts and Java when you want to learn Compose. Check that resources use Kotlin and Jetpack Compose.
Storing important state only inside a composable, then losing it on rotation. Keep screen state in a ViewModel and use rememberSaveable for small UI values.
Running network or database work on the main thread, which freezes the UI. Use coroutines with suitable dispatchers.

How Learnr builds your course

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Tell Learnr you want to learn Android Development, or get as specific as you like.

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Android Development questions, answered

Should I learn Kotlin or Java for Android?

Kotlin. Google recommends it for Android, and Jetpack Compose is Kotlin-only. Java is still useful for reading older code and libraries.

Do I need a powerful computer for Android development?

Android Studio and the emulator use a lot of memory and CPU, so a reasonably modern machine helps. Testing on a physical phone reduces the load if your computer is slower.

How do I publish an Android app?

You create a Google Play developer account, which has a one-time registration fee, build a signed app bundle, complete the store listing and policy forms, and submit it for review.