Why Start Android Development with Kotlin?

Kotlin is now Google's officially preferred language for Android development. It's concise, expressive, and designed to eliminate many of the common pitfalls of Java. If you're starting from scratch, Kotlin is the right choice — and this guide will take you from zero to a working app.

What You'll Need

  • Android Studio — the official IDE, free to download from developer.android.com
  • A computer with at least 8GB of RAM (16GB recommended)
  • Basic programming knowledge — you don't need to know Kotlin yet, but understanding variables and functions helps
  • An Android device or emulator for testing

Step 1: Set Up Android Studio

Download and install Android Studio. During the setup wizard, install the Android SDK, an emulator image (choose a recent Pixel device), and the build tools. This may take 10–20 minutes depending on your connection.

Once installed, open Android Studio and select New Project → Empty Activity. Choose Kotlin as the language and set your minimum SDK to API 24 (Android 7.0) to cover most devices.

Step 2: Understand the Project Structure

Before writing code, get familiar with what Android Studio created for you:

  • MainActivity.kt — the entry point of your app, written in Kotlin
  • activity_main.xml — the layout file that defines your screen's UI
  • AndroidManifest.xml — declares app permissions, activities, and metadata
  • build.gradle — manages your project dependencies and SDK versions

Step 3: Design Your UI

Open activity_main.xml and switch to the Design view. Drag a Button and a TextView onto the canvas. Give the button an ID of btnGreet and the text view an ID of tvMessage.

Switch to the Code view and you'll see the XML that was generated. This is how Android describes layouts — every UI element is an XML tag with attributes like width, height, and text.

Step 4: Write Your First Kotlin Code

Open MainActivity.kt. Inside the onCreate function, add the following:

val button = findViewById<Button>(R.id.btnGreet)
val message = findViewById<TextView>(R.id.tvMessage)

button.setOnClickListener {
    message.text = "Hello, Android Developer!"
}

This code finds your button by its ID and attaches a click listener. When the user taps the button, the text view updates with a greeting.

Step 5: Run Your App

Click the green Run button (or press Shift+F10). Android Studio will build your project and launch it on your emulator or connected device. Tap the button — you should see your message appear!

What to Learn Next

  1. Layouts — ConstraintLayout, LinearLayout, and RecyclerView
  2. Navigation — moving between multiple screens (Activities and Fragments)
  3. ViewModel and LiveData — managing UI state properly
  4. Room Database — storing data locally on the device
  5. Retrofit — fetching data from APIs

Key Takeaway

Building your first Android app is simpler than it looks. The hardest part is understanding the project structure — once that clicks, everything else builds on top. Start small, experiment freely, and don't be afraid to break things. That's exactly how real developers learn.