Blog | 16 February 2023 | App Development | Rahul Gupta
Kotlin Multiplatform Mobile (KMM) is a new and exciting technology that allows developers to write cross-platform applications using Kotlin. With KMM, you can write business logic and share it across all platforms, including iOS and Android. In this tutorial, we’ll walk through building your first mobile app with Kotlin Multiplatform Mobile.
To follow this tutorial, you’ll need the following installed on your machine:
You’ll also need some basic knowledge of Kotlin and mobile app development.
The first step is to set up a new KMM project in Android Studio. Here are the steps:
In KMM, the shared module is where you’ll write the business logic that will be shared across all platforms. To create a shared module, follow these steps:
Add the following code to the file:
class Greeting { fun greeting(): String { return "Hello, KMM!" } }
Next, you’ll create a platform-specific module for Android and iOS. To create an Android module, follow these steps:
To create an iOS module, follow these steps:
To implement the shared module on Android, follow these steps:
implementation project(":shared")
import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import com.example.shared.Greeting class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val greeting = Greeting() val message = greeting.greeting() Toast.makeText(this, message, Toast.LENGTH_SHORT).show() } }
To implement the shared module on iOS, follow these steps:
pod 'shared', :path => '../shared'
import SwiftUI import shared struct ContentView: View { var body: some View { Text(Greeting().greeting()) } } struct ContentView_Previews: PreviewProvider { static var previews: some View { ContentView()
Building and running the app
Now that you have implemented the shared module on both Android and iOS, you can build and run the app. Here are the steps:
Congratulations! You have just built your first mobile app with Kotlin Multiplatform Mobile.
Kotlin Multiplatform Mobile is an exciting technology that allows developers to write cross-platform apps using Kotlin. With KMM, you can share business logic across all platforms, making it easier and faster to develop high-quality apps. In this tutorial, you learned how to create a new KMM project, implement a shared module, and build and run the app on Android and iOS. If you’re interested in learning more about KMM, I recommend checking out the official documentation and experimenting with some sample projects.
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