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CLAUDE.md

Guidance for working in this repository.

Project

Swap App — a native Android app (io.horizontalsystems.swapapp) built with Kotlin and Jetpack Compose. Currently a scaffold from the Android Studio Compose template; UI is a single MainActivity rendering a Compose Scaffold.

Tech stack

  • Language: Kotlin 2.2.10
  • UI: Jetpack Compose (Material 3), Compose BOM 2026.02.01
  • Build: Gradle 9.4.1 (wrapper) with Android Gradle Plugin 9.2.1, Kotlin DSL build scripts
  • JDK: 17 (project compiles Java/Kotlin to JavaVersion.VERSION_11 bytecode)
  • SDK: compileSdk 37, targetSdk 37, minSdk 28
  • Dependency versions are centralized in gradle/libs.versions.toml (version catalog). Reference them via libs.* in build files rather than hardcoding versions.

Common commands

./gradlew assembleDebug        # build the debug APK
./gradlew testDebugUnitTest    # run JVM unit tests (app/src/test)
./gradlew connectedDebugTest   # run instrumented tests (needs a device/emulator)
./gradlew lint                 # run Android lint
./gradlew installDebug         # install on a connected device/emulator
./gradlew clean                # clean build outputs

The debug APK is written to app/build/outputs/apk/debug/.

Layout

  • app/src/main/java/io/horizontalsystems/swapapp/ — app code
    • MainActivity.kt — entry point / Compose host
    • ui/theme/ — Compose theme (Theme.kt, Color.kt, Type.kt)
  • app/src/main/res/ — Android resources (strings, icons, themes)
  • app/src/main/AndroidManifest.xml — manifest
  • app/src/test/ — JVM unit tests; app/src/androidTest/ — instrumented tests
  • app/build.gradle.kts — module build config; gradle/libs.versions.toml — version catalog

Notes

  • local.properties holds sdk.dir and is local-only (not version controlled).
  • This project requires SDK platform android-37 installed (the AndroidX dependencies require compiling against API 37).