How do I set up Firebase for DroidconKotlin?

You need to create a Firebase project, download the google-services.json file for Android and place it in android/google-services.json, and get GoogleService-Info.plist for iOS into ios/Droidcon/Droidcon/, as specified in the README. This is mandatory for the app to run.

Is Compose Multiplatform stable enough for iOS production apps?

Yes, this project demonstrates stability by being the first CMP app in the iOS App Store and, as of March 2025, has removed the SwiftUI version entirely, relying solely on CMP. However, early versions had issues, so check compatibility for your Kotlin version.

Kotlin Multiplatform vs Flutter: which is better for cross-platform?

KMP offers native performance through compiled Kotlin code and shared logic with Compose for UI, while Flutter uses Dart and a custom rendering engine. DroidconKotlin shows KMP's strength in code sharing, but Flutter might be easier for teams familiar with Dart or needing web support.

How can I customize this app for a non-event application?

Since it's designed for Droidcon events, you'll need to modify the shared KMP modules to remove or adapt event-specific features like schedules. This requires significant changes to both UI and business logic, leveraging Kotlin Multiplatform's flexibility.

What are the performance costs of using Kotlin Multiplatform?

KMP compiles to native code, so performance is close to native. Shared UI via Compose Multiplatform might introduce slight overhead on iOS compared to SwiftUI, but this app proves it's viable for production with optimizations over time.

How to add web support to this Kotlin Multiplatform project?

The current setup only targets Android and iOS. To add web, you'd need to extend the KMP modules to include JS targets and potentially use Compose for Web, which isn't covered in this example, requiring additional setup and learning.

Open-Awesome

DroidconKotlin

Apache-2.0Kotlin

A Kotlin Multiplatform mobile app for Droidcon events, built with Compose Multiplatform for Android and iOS.

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1.1k stars91 forks0 contributors

What is DroidconKotlin?

Droidcon Mobile Clients is a Kotlin Multiplatform mobile application built for Global Droidcon events. It uses Compose Multiplatform to provide native experiences on both Android and iOS from a shared codebase, serving as a production example of modern cross-platform development. The app centralizes event information like schedules and sessions for conference attendees.

Target Audience

Mobile developers and teams looking to adopt Kotlin Multiplatform and Compose Multiplatform for building cross-platform apps, especially those needing a real-world reference implementation.

Value Proposition

It offers a proven, production-ready example of Kotlin Multiplatform and Compose Multiplatform, demonstrating how to share UI and logic across Android and iOS while reducing development overhead and maintaining native performance.

Overview

Kotlin Multiplatfom app for Droidcon Events

Use Cases

Best For

Building cross-platform mobile apps with Kotlin Multiplatform
Learning Compose Multiplatform for iOS and Android development
Creating event or conference mobile applications
Reference implementation for KMP production projects
Sharing UI code between Android and iOS using Compose
Reducing duplicate code in multi-platform mobile projects

Not Ideal For

Projects targeting platforms beyond Android and iOS, such as web or desktop
Teams avoiding Firebase or preferring other backend services like AWS or custom APIs
Developers needing a minimal, framework-agnostic codebase without Kotlin Multiplatform dependencies
Apps that heavily rely on platform-specific native UI components not yet optimized in Compose Multiplatform

Pros & Cons

Pros

Production-Ready Reference

As one of the earliest KMP apps in the iOS App Store and the first Compose Multiplatform app released, it provides a proven, mature example for cross-platform development, as highlighted in the README.

Shared UI and Logic

Uses Compose Multiplatform to share UI code and Kotlin Multiplatform for business logic, reducing duplication across Android and iOS, which is core to its value proposition.

Event-Focused Practicality

Tailored for Droidcon conferences with features like schedules and sessions, offering a real-world use case that demonstrates applied KMP development.

Firebase Integration Example

Demonstrates Firebase setup for both platforms, requiring configuration files as per the README, which is useful for teams using similar backend services.

Cons

Complex Initial Setup

Requires Firebase account setup with separate configuration files for Android and iOS, adding overhead before the app can run, as noted in the README.

Vendor Lock-in Risk

Heavily relies on Firebase, limiting flexibility for teams that prefer or require alternative backend solutions or want to avoid Google services.

Limited Platform Coverage

Focused solely on Android and iOS, with no examples for other Kotlin Multiplatform targets like web or desktop, reducing its utility for broader cross-platform projects.

Historical Stability Concerns

The README mentions poor early Compose experience on iOS and the removal of a SwiftUI version, indicating past instability that might concern teams about long-term reliability.

Frequently Asked Questions

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