MultiplatformMenu

The simple example multiplatform project in Kotlin created using Android Studio. It contains the backend and android subprojects.

Backend

The backend subproject uses Ktor framework to build API. It contains methods like this:

• /categories Response:

[
  {
    "id": 1,
    "name": "Menu"
  },
  {
    "id": 2,
    "name": "Drinks"
  },
  {
    "id": 3,
    "name": "Cocktails"
  }
]

Android client

The Android client uses the Fuel library for network requests and the Arrow library which contains functional features such as typeclasses.

The example of Fuel usage:

fun getCategories(): IO<List<Category>> =
        IO.pure(Fuel.get("/categories").responseObject<List<Category>>().third.get())

The example of usage the Monad from the Arrow library with coroutines.

try {
   IO.monad().binding {
      val categories = getCategories().bind()
      val subcategories = getSubCategories(categories.first().id).bind()
      val items = getItems(subcategories.first().id).bind()
      items
   }.ev().unsafeRunSync().let { items -> launch(UI) { adapter.dataSource = items } }
} catch (e: Exception) {
   e.printStackTrace()
}

This example demonstrates how to create an async sequence of operations.