Android Hello World App

A simple Android application demonstrating a "Hello World" screen built with Kotlin and modern Android development practices.

Tech Stack

• Language: Kotlin 1.9.20
• Build Tool: Gradle 8.2 with Android Gradle Plugin 8.2.0
• SDK: Min 24 (Android 7.0) / Target 34 (Android 14)
• UI: XML layouts with ConstraintLayout
• Libraries: AndroidX Core KTX, AppCompat, Material Design Components

Quick Start

Build the App

./gradlew assembleDebug

Run Tests

./gradlew test

Install on Device/Emulator

adb install -r app/build/outputs/apk/debug/app-debug.apk

Project Structure

android-sample-app/
├── app/src/main/
│   ├── java/com/example/helloworld/
│   │   └── MainActivity.kt          # Main entry point
│   ├── res/layout/
│   │   └── activity_main.xml        # Main screen layout
│   └── AndroidManifest.xml
├── build.gradle                     # Build configuration
└── .claude/commands/                # Development commands

Prerequisites

• Android SDK (install via command line tools or Android Studio)
• Java 11+ for builds (set as JAVA_HOME)
• AndroidX enabled in gradle.properties

Architecture & Best Practices

This project follows Android's official architecture guidelines:

• Separation of concerns
• Resource externalization (string resources)
• ConstraintLayout for flexible UI

For production apps, see Architecture Recommendations to learn about MVVM, dependency injection, navigation components, and more.

License

This is a sample project for learning purposes.