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Panchadika - Android SMS App

Overview

Panchadika is an Android SMS application with carrier auto-detection, conversation management, and modern Material Design 3 UI. It is written in Kotlin with Jetpack Compose.

Tech Stack

  • Language: Kotlin 1.9.25
  • UI: Jetpack Compose (Material Design 3)
  • Architecture: Clean Architecture + MVVM
  • DI: Dagger Hilt 2.51.1
  • Navigation: Jetpack Navigation Compose
  • Async: Kotlin Coroutines + Flow
  • Image Loading: Coil
  • Build System: Gradle 8.9 with Kotlin DSL
  • Min SDK: 26 (Android 8.0)
  • Target SDK: 34 / Compile SDK: 35

Project Structure

  • app/src/main/java/com/panchadika/
    • data/ - Repositories and data sources (SMS, Contacts, Carrier)
    • domain/ - Business logic, use cases, models
    • presentation/ - Jetpack Compose UI, ViewModels
    • di/ - Hilt dependency injection modules

Build Setup (Replit)

This is an Android app — it cannot run in the browser. It builds to an APK.

Android SDK Location

  • Android SDK: ~/android-sdk
  • Platform: android-35
  • Build Tools: 35.0.1
  • JDK: OpenJDK 17 at /nix/store/6m2zgvl7y9mrsdckqx4mgxghpmasszbi-openjdk-17.0.6+10

Build Command

bash build_apk.sh

Or directly:

export ANDROID_HOME=~/android-sdk
export JAVA_HOME=/nix/store/6m2zgvl7y9mrsdckqx4mgxghpmasszbi-openjdk-17.0.6+10
export PATH=$JAVA_HOME/bin:$PATH:~/android-sdk/cmdline-tools/latest/bin:~/android-sdk/platform-tools
./gradlew assembleDebug

APK Output

After a successful build:

  • Debug APK: app/build/outputs/apk/debug/app-debug.apk

Workflow

  • Build APK - Runs bash build_apk.sh to compile the debug APK (console output)

App Icon

A custom chat bubble icon was added using the app's teal green (#44FC94) + dark (#0C140C) color scheme.

  • Adaptive icon foreground: app/src/main/res/drawable/ic_launcher_foreground.xml (vector: dark chat bubble with two teal pill lines)
  • Adaptive icon background: @color/primary (#44FC94)
  • Legacy mipmap PNGs: Generated at mdpi (48), hdpi (72), xhdpi (96), xxhdpi (144), xxxhdpi (192) — both square and round variants
  • Play Store icon source: attached_assets/play_store_icon.png (512x512)
  • Source image: attached_assets/generated_images/app_icon_source.png

Notes

  • gradle.properties sets org.gradle.java.home to OpenJDK 17 for Android compatibility
  • GraalVM 19 (system default) is NOT compatible with Android build tools due to jlink issues
  • Android SDK is stored in android-sdk/ (gitignored, auto-downloaded by build_apk.sh if missing)
  • local.properties is gitignored and auto-generated by build_apk.sh with the correct SDK path
  • Only minor deprecation warnings in code (no functional impact)