Slack Android Clone with Compose is now in Kotlin Multiplatform!

Status: Active Development happening here https://github.com/oianmol/SlackComposeMultiplatform

This is a jetpack compose sample app written in Kotlin following clean architecture principles.

The purpose of this app to showcase:

• Implementation of Jetpack Android Architecture components with Dagger Android and jetpack compose
• Creation of proper components and Subcomponents using Dagger Android and their injection into Activity, Compose Views, View Models and Helper Classes
• Performing background task with Kotlin Coroutines

Screenshots

Screenshots	In Progress

TODOs and questions to self

• Rewrite the Colors and light/dark mode compatibility!
• Should we have separate theme for each UI module ?
• How to handle dynamic theme colors ?

🏗️️ Built with ❤️ using Jetpack Compose 😁

Languages, libraries and tools used

• Kotlin
• AndroidX libraries
• Android Architecture Components
• Android Data Binding
• Dagger 2
• Retrofit
• Kotlin Coroutines

Architecture

SlackClone follows the principles of Clean Architecture with Android Architecture Components.

Architecture's layers & boundaries:

UI Layer contains UI (Activities, Composables, Fragments) that are coordinated by _ ViewModels which execute 1 or multiple UseCases._ Presentation Layer depends on Domain Layer.

Domain Layer is the most INNER part of the circle (no dependencies with other layers) and it contains Entities, Use cases & Repository Interfaces. Use cases combine data from 1 or multiple Repository Interfaces.

Data Layer contains Repository Implementations and 1 or multiple Data Sources. Repositories are responsible to coordinate data from the different Data Sources. Data Layer depends on Domain Layer.

Notes: Mapping between response models and transformed models will happen via extension functions defined in transformed model file

When writing a new ui module

• First, Create a new android library module
• Make sure to copy build.gradle.kts from other ui module and paste it in your ui-module
• We need one fragment to host the composables, this fragment will be added to main nav graph.
• the routing within compose world is handled with Compose Navigator
• and to move out of one ui module you need to use the fragment navigator!

Conventions:

Files are suffixed with be defined Class types.

• ViewModels are suffixed with VM. Ex: LoginVM
• UseCases are suffixed with UseCase. Ex: LoginUseCase
• Sources are suffixed with Source. Ex: LoginRemoteSource, LoginLocalSource
• Repositories are suffixed with Repo. Ex: LoginRepo

Conclusion

This project can be used as a template for new apps. This project is continually evolving to integrate other libraries and techniques to keep it up to date.