Hali

A simple app to fetch weather forecast from open-meteo, built using Kotlin Multiplatform. It targets iOS and Android platforms.

Prerequisites

To run the app, you will need:

• Android Studio - to run the android app
• Xcode - to be able to run the iOS app

Architecture

The app has been built using a modularized layered architecture. The app has the following modules:

• composeApp - contains the shared logic and the android app
• iosApp - contains the setup for the iOS app

Screenshots

android

Home	Details

ios

Home	Details

Libraries and tech stack

• Kotlin - programming language
• Kotlin Multiplatform - Multiplaform framework
• Compose Multiplatform - Declarative framework for sharing UIs across multiple platforms. Based on Kotlin and Jetpack Compose.
• Koin - a pragmatic lightweight dependency injection framework for Kotlin & Kotlin Multiplatform.
• Ktor Client - networking client framework
• KotlinX Serialization - Serialization/Desirialization of JSON response from network.
• KtLint - An anti-bikeshedding Kotlin linter with built-in formatter

CI/CD

• Github Actions - to run tests, run lint checks and assemble apk. The deployment workflows are WIP.

Improvements

Given enough time, I would have loved to:

• UI/UX - improve the design of the app.
• Pick user location - currently the location(longitude/latitude) is static and timezone is Asia/Tokyo, the app should pick user's location when they open and show them weather forecast based on their current location.
• Allow user to search - linked to above, let users search and view forecast for other places other than their current location
• Improve test coverage.

Issues Faced

1. iOS compilation fails with IllegalStateException

• Fixed by adding kotlin.native.cacheKind=none to gradle.properties
• Read more here

2.  Constructor 'CupertinoScrollDecayAnimationSpec.<init>' can not be called: No constructor found for symbol 'androidx.compose.animation.core.cupertino/CupertinoScrollDecayAnimationSpec.<init>|<init>(kotlin.Float){}[0]'
   

   • Fixed by downgrading compose-navigation version to 2.8.0-alpha12
   • Read more here