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Google Endorses Kotlin Multiplatform | Kodeco


Throughout 2017 Google I/O, Android builders rejoiced with the announcement of Kotlin as one of many essential languages for app improvement. With the language’s steady improvement and robust group adoption, the Android crew quickly switched fully to Kotlin. From that time forth, all of the libraries had been written solely in Kotlin.

This yr, with the steadiness of Kotlin Multiplatform, the growing developer adoption, and the brand new K2 compiler, Google joined the group to announce its assist for multiplatform improvement.

Notice: This text offers a short overview of the Kotlin Multiplatform framework. In case you are in search of a deep dive, see our Kotlin Multiplatform by Tutorials ebook. It’s written by the writer of this text.

Kotlin Multiplatform

Kotlin Multiplatform, or KMP, is a know-how that permits builders to share their enterprise logic throughout a number of platforms: Android, iOS, Desktop, Internet and Server. It stands out amongst cross-platform options like Flutter and React-Native as a result of its objective isn’t to have a single codebase and share all the code however to share what is smart to your mission. This solely pertains to your app’s enterprise logic and never UI.

There are clear benefits:

  • You don’t have to commit your whole mission to a single framework: This is a crucial level, particularly now that the assist from Xamarin ended. Apps that had been constructed with it now must be migrated to .NET or rewritten in… Kotlin Multiplatform.
  • You resolve what’s value sharing and when: KMP adoption doesn’t carry danger to your mission. You don’t have to migrate your app instantly: you can begin utilizing it when there’s a brand new characteristic to implement. Then, use it once more within the subsequent requirement and the one after. As soon as your crew is assured, you’ll be able to analyze if it’s value refactoring components of your app. If it’s not, maintain them as they’re. Kotlin Multiplatform is interoperable along with your current code.

Deal with sharing the enterprise logic as a result of the UI is normally carried out natively, both with XML/ Compose for Android or UIKit/Swift UI for iOS. This lets builders use native APIs to construct a extra performant and scalable app constructed on a robust basis.

Adjustments to Kotlin Multiplatform

For individuals who are already conversant in Kotlin Multiplatform, the framework has leveled up a bunch of latest additions similar to:

Android Libraries With KMP Assist

Google Docs Joins the KMP Journey!

Documentation Replace

Pattern Apps

Together with the announcement, Google launched updates in a few Android libraries, now with assist for Kotlin Multiplatform. They’re presently in several ranges of improvement. Those thought-about secure are:

Whereas the alpha variations are:

Google Docs migrated to make use of Kotlin Multiplatform for the enterprise logic, which is now shared throughout Android, iOS, and Internet. Though there have been no additional particulars, the Google Workspace crew is predicted so as to add the identical assist to different apps like Gmail, Calendar, Drive, and Meet later within the yr.

Google Docs has over one billion downloads on the Google Play Retailer and a mean of 4.3 stars. These metrics are necessary to point out Google’s dedication to Kotlin Multiplatform and make sure its validation on a extensively used app that must be performant to satisfy customers’ wants.

The Android crew additionally up to date the official documentation so builders can see which lessons can be found for Multiplatform. As an illustration, go to androidx.assortment to see which information varieties you need to use on Android, Desktop, and iOS (Native).

Android documentation for androidx.collection showing the current support for Kotlin Multiplatform

There’s now a GitHub repository for Kotlin Multiplatform samples on Android. Right here, you could find two pattern apps that use the libraries introduced throughout Google I/O:

Each initiatives goal Android and iOS. Earlier than you’re employed on these apps, it’s essential to configure your setup.

  • Android Libraries With KMP Assist

    Together with the announcement, Google launched updates in a few Android libraries, now with assist for Kotlin Multiplatform. They’re presently in several ranges of improvement. Those thought-about secure are:

    • Annotations: Use annotations in your lessons, capabilities, and properties.
    • Collections: A set of assortment varieties and utilities.
    • DataStore: Supplies a key-value information storage answer.
    • Paging: Simplifies loading massive datasets by creating teams of smaller chunks (paginated) that the person can simply entry.
    • WindowSize Class: Defines the present measurement of a window. Use it to characterize completely different display screen sizes and configurations.

    Whereas the alpha variations are:

    • Room: Android’s official library for native storage (SQLite).
    • Lifecycle: Manages the lifecycle of actions, permitting parts to regulate their conduct relying on the lifecycle state.
    • ViewModels: Shops and manages UI information relying on the exercise lifecycle.
  • Google Docs Joins the KMP Journey!

    Google Docs migrated to make use of Kotlin Multiplatform for the enterprise logic, which is now shared throughout Android, iOS, and Internet. Though there have been no additional particulars, the Google Workspace crew is predicted so as to add the identical assist to different apps like Gmail, Calendar, Drive, and Meet later within the yr.

    Google Docs has over one billion downloads on the Google Play Retailer and a mean of 4.3 stars. These metrics are necessary to point out Google’s dedication to Kotlin Multiplatform and make sure its validation on a extensively used app that must be performant to satisfy customers’ wants.

  • Documentation Replace

    The Android crew additionally up to date the official documentation so builders can see which lessons can be found for Multiplatform. As an illustration, go to androidx.assortment to see which information varieties you need to use on Android, Desktop, and iOS (Native).

    Android documentation for androidx.collection showing the current support for Kotlin Multiplatform

  • Pattern Apps

    There’s now a GitHub repository for Kotlin Multiplatform samples on Android. Right here, you could find two pattern apps that use the libraries introduced throughout Google I/O:

    • DiceRoller: Makes use of DataStore to retailer and observe preferences.
    • Fruitties: Makes use of Room and DataStore to retailer and show information.

    Each initiatives goal Android and iOS. Earlier than you’re employed on these apps, it’s essential to configure your setup.

As you’ll be able to see, KMP offers quite a lot of superior updates. Earlier than you’ll be able to actually admire them, it’s essential to get it working in your machine. Fortunately, it’s not too troublesome.

Putting in KMP

Earlier than opening the apps, it’s essential to set up:

As soon as put in, open the pattern that you just need to compile.


brew set up cocoapods

After synchronizing the mission, you’ll be able to choose which app you wish to run by way of configurations: androidApp or iosApp. One app targets Android units/emulators, and the opposite iOS units/simulators.

You can compile your apps to Android or iOS targets.

Right here’s DiceRoller compiled for each platforms:

DiceRoller app running on the Android emulator and on the iOS simulator

You’ll get this error as a result of the pattern makes use of an older model of AGP (Android Gradle Plugin). To resolve this, open the libs.model.toml file positioned contained in the gradle folder and search for agp. Substitute the present model with:

Synchronize the mission. Now you’ll be able to compile the app for each targets.

When compiling the iOSApp configuration you would possibly see the next error:

Subsequent to it, you’ll see a button with the textual content Repair on it. Click on it to open Xcode, which ought to load the right schema.

Should you nonetheless see the earlier error, compile the mission instantly from Xcode.

Alternatively, you’ll be able to attempt to reboot your Mac.

Notice: Relying on the model of Android Studio you’re utilizing, you would possibly see the next error when attempting to run your app:


Assortment incorporates no aspect matching the predicate.

You’ll get this error as a result of the pattern makes use of an older model of AGP (Android Gradle Plugin). To resolve this, open the libs.model.toml file positioned contained in the gradle folder and search for agp. Substitute the present model with:


agp = "8.4.1"

Synchronize the mission. Now you’ll be able to compile the app for each targets.

When compiling the iOSApp configuration you would possibly see the next error:


Error: cannot seize Xcode schemas with /usr/bin/xcodebuild

Subsequent to it, you’ll see a button with the textual content Repair on it. Click on it to open Xcode, which ought to load the right schema.

Should you nonetheless see the earlier error, compile the mission instantly from Xcode.

Alternatively, you’ll be able to attempt to reboot your Mac.


Assortment incorporates no aspect matching the predicate.

agp = "8.4.1"

Error: cannot seize Xcode schemas with /usr/bin/xcodebuild

Right here’s Fruitties working on the Android Emulator and iOS Simulator:

Fruitties app running on the Android emulator and on the iOS simulator

Notice: To compile the iOS model, you need to set up a MacBook with Xcode on each apps.

It’s lastly time to get began!

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