Questions tagged [kotlin-multiplatform]
Refers to Kotlin Multiplatform projects, aimed to share codebase between JVM, JS, Android, and Native
1,864
questions
102
votes
10
answers
166k
views
Flutter & Android: Your build is currently configured to use Java 17.0.2 and Gradle 7.0.2
I got this on my android part of Flutter.
Unsupported Java.
Your build is currently configured to use Java 17.0.2 and Gradle 7.0.2.
Possible solution:
- Open Gradle wrapper settings, change `...
- 3,188
86
votes
2
answers
126k
views
Check your module classpath for missing or conflicting dependencies [closed]
I have a project with Java and Kotlin, which I am able to successfully run and build. However, when I open the project in IntelliJ, I see the same error in many of the project files.
The error is &...
- 1,239
36
votes
1
answer
6k
views
Kotlin Multiplatform Mobile targetSdk deprecated
I set up my build.gradle.kts file in the shared module of my KMM project like the following snippets shows:
android {
namespace = "com.my.project"
compileSdk = 33
sourceSets[&...
- 1,673
25
votes
3
answers
42k
views
Generate UUID on kotlin-multiplatform?
Are there any kotlin-multiplatform common functions to get a UUID/GUID?
// ideally something like this
val newUUID = UUID() // "1598044e-5259-11e9-8647-d663bd873d93"
println("newUUID = $newUUID")
...
- 4,971
25
votes
0
answers
2k
views
Is there anyway we can create flavored versions of Kotlin Multiplatform build files like dev and prod?
I have a requirement where I want to have different set of data to be shipped with the library generated by kotlin multiplatform module for different flavors like dev and prod.
In an Android project, ...
- 1,246
22
votes
2
answers
5k
views
@Parcelize in multi-platform project
I'd like to create a class in a multi-platform project, and use Parcelize to make it Parcelable in the Android version.
So in my lib-common project, I tried:
expect annotation class Parcelize()
...
- 27.4k
20
votes
5
answers
9k
views
Sqldelight database schema not generated
I have a KMM project and want to use SqlDelight library, but when I build the project database schema not generated and table entities also.
actual class DatabaseDriverFactory(private val context: ...
- 5,347
20
votes
1
answer
6k
views
How to convert Kotlin ByteArray to NsData and viceversa
Fighting with a Kotlin Multiplatform project I have ended with the problem of needing to work with NsData on my iOS platform from the sharedModule working with Kotlin Native.
Because of this, I need ...
- 12.9k
20
votes
4
answers
22k
views
Handling Exception in HttpClient Ktor
I have written a common code in a common module as below and tested in JS environment
val response = client.post<HttpResponse>(url) {
body = TextContent("""{"a":1,"b":2}""", ContentType....
- 1,978
19
votes
3
answers
10k
views
Listen to Kotlin coroutine flow from iOS
I have setup a Kotlin Multiplatform project and attached a SQLDelight database to it. Its all setup and running correctly as i have tested it on the android side using the following:
commonMain:
...
- 1,775
19
votes
3
answers
8k
views
Is there a way to use Firebase (Authentication) with Kotlin Multiplatform?
I have a project which uses Firebase Authentication in Android. It works well and I want to port the same project to an iOS App using code sharing with Kotlin Multiplatform.
I initially thought I ...
- 12.7k
17
votes
4
answers
4k
views
Using kapt with multiplatform subproject
I have the following project structure
root-project
│ build.gradle.kts
│
└───multiplatform-project
│ │ build.gradle.kts
│ │
│ └───src
│ │ kotlin
| | js
│
└───simple-...
- 508
17
votes
1
answer
1k
views
How to Implement Custom Cache Mechanism with Kotlin Multiplatform(Android, iOS) Ktor Client
I am working on Kotlin Multiplatform Project. I used Ktor Client for Network calls. I want to cache some request based on some custom logic not based on response header.
HttpCache feature provided ...
- 1,044
16
votes
2
answers
5k
views
Kotlin Multiplatform Configuration issue
I continue getting Gradle configuration error in my KMP + Jetpack Compose project
A problem occurred configuring project ':shared'.
Configuration with name 'testApi' not found.
My setup is:
Android ...
- 307
16
votes
9
answers
20k
views
"No transformation found: class io.ktor.utils.io.ByteChannelNative" error using Ktor
I'm trying to fetch and deserialize some data that is being hosted on github.
{
"Meals": [
{
"id": "1598044e-5259-11e9-8647-d663bd870b02",
"name&...
- 372
16
votes
2
answers
673
views
KMM: Compilation failed: Unexpected IrType kind: KIND_NOT_SET
I'm trying to run tests in the shared library.
Setup (versions should be the same for both machines - all are up to date as of today):
Kotlin 1.6.21 (tried 1.6.20 and 1.6.10)
OpenJDK 11.0.15 (via ...
- 3,500
16
votes
0
answers
5k
views
SourceSet with name 'jvmMain' not found
I'm trying to run kotlin multiplatform project with jvm and js source sets but am getting the following error:
FAILURE: Build failed with an exception.
* Where:
Initialization script '/private/var/...
- 4,977
15
votes
3
answers
9k
views
File IO with Kotlin multiplatform
I would like to do some basic filesystem operations on mingwX64 Windows (and possibly other platforms): open, close, read, rename, get metadata, list files in a directory.
I have found one project ...
- 1,464
15
votes
5
answers
4k
views
Kotlin Multiplatform: How to mock objects in a unit test for iOS
I'm working on a Kotlin-multiplatform (KMP) library for iOS / Android. I have written some unit tests for JVM, for which I use MockK to create spies and mocks, but MockK doesn't support Kotlin native ...
- 1,367
15
votes
1
answer
3k
views
What's the different between native-mt and normal kotlin coroutine lib?
When we use coroutine, we can either have the normal kotlin coroutine or the native-mt version.
i.e.
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.5.0'
or
implementation '...
- 57.3k
15
votes
1
answer
5k
views
How to fix 'The feature "multi platform projects" is experimental and should be enabled explicitly' warning in IntelliJ IDEA
Whenever I write an expect function in IntelliJ IDEA, I get the following warning:
The feature "multi platform projects" is experimental and should be enabled explicitly
Where can enable ...
- 434
14
votes
5
answers
6k
views
How to configure an iOS Application for Kotlin Multiplatform in Android Studio?
I want to add a Run/Debug Configuration for an iOS Application for a Kotlin Multiplatform Mobile application in Android Studio 4.1.2. However, there seems to be a problem with the configuration for ...
- 19.9k
13
votes
8
answers
11k
views
KMM project setup with cocoaPods fails on first compile
I created a new KMM project and selected Cocoapods for the iOS framework distribution and as soon as it finished building it threw the following error:
Executing of 'pod install' failed with code 1.
...
- 700
13
votes
2
answers
8k
views
Kotlin Multiplatform : Plugin [id: 'com.android.library'] was not found
I am trying to set up Android Library via Kotlin Multiplatform Library.
I am getting error:
Plugin [id: 'com.android.library'] was not found in any of the following sources:
Please help me by ...
- 488
13
votes
2
answers
6k
views
Spaces in test method names when targeting multiplatform
I really love the ability of Kotlin to add spaces to method names, which is a well-documented approach commonly used to make test names more readable:
In tests (and only in tests), it's acceptable ...
- 18.8k
13
votes
2
answers
3k
views
Kotlin Multiplatform Mobile: How to handle errors (network, db, etc.) in iOS?
I have this function that makes a network request and writes results to SQLDelight database:
@Throws(Exception::class)
suspend fun updateData()
In iOS project in Xcode I see that this function is ...
- 6,491
13
votes
1
answer
832
views
How to read file with okio inside commanMain module in a Kotlin Multiplatform Project?
I am trying to read/write files in the commonMain module.
I created a new Kotlin Multiplatform App for Android and iOS using the Android Studio Wizard. (New -> New Project ... -> Koltin ...
- 1,758
13
votes
0
answers
359
views
Kotlin multiplatform 'Go to declaration' goes to decompiled code
When using using Android Studio's 'Go to declaration' feature (cmd + click), a decompiled source is shown, when though the source is in my project. The kotlin MP source is in another module. I can ...
- 19.3k
13
votes
2
answers
11k
views
Kotlin Multiplatform Mobile unable to run on iOS: Execution failed for task ':shared:compileKotlinIosX64'
I have created fresh project(Hello World) in KMM followed by their official website. In android it works smooth but when I am trying to run in XCode it's giving errors because of which I am unable to ...
- 434
12
votes
6
answers
15k
views
Kotlin Multi Platform default project error running iOs App: could not resolve com.android.tools.build:gradle:7.4.0-rc01
I created a default KMP project, and changed nothing. It runs fine on android, but when I try to run it on iOS it tells me that it cant find the gradle plugin:
A problem occurred configuring root ...
- 7,743
12
votes
3
answers
3k
views
Kotlin multiplatform: Accessing build variables in code
I'm working on a Kotlin Multiplatform project which is an SDK providing functionality for iOS & Android applications.
In our build.gradle.kts we have a couple of variables that we would like to ...
- 133
12
votes
3
answers
6k
views
Use Gradle sub-projects with Kotlin multiplatform
I'm using Kotlin multi-platform (JVM & JS), which in IDEA creates three projects: demo, demo-js and demo-jvm.
I would like to split the common code into more subprojects/submodules. Let's say I ...
- 19.4k
12
votes
4
answers
4k
views
Is there multiplatform lock in Kotlin?
What multiplatform Lock or synchronization approach should be used in multiplatform Kotlin code? Previously in Java code i used synchronized and i can see synchronized in Kotlin too. However it's ...
- 20.1k
12
votes
4
answers
7k
views
Is there a way in Kotlin Multiplatform to format a float to a number of decimal places?
Most of the answers use Java (e.g. String.format) to get the job done, but I need a way to do this purely with Kotlin to support multiplatform programming.
This means not using java.* standard ...
- 267
12
votes
3
answers
3k
views
Kotlin Multiplatform Project Unit Test Issue
Today I just updated my Android Studio to
Android Studio 3.5.2
Build #AI-191.8026.42.35.5977832, built on October 31, 2019
JRE: 1.8.0_202-release-1483-b49-5587405 x86_64
JVM: OpenJDK 64-Bit Server VM ...
- 143
11
votes
4
answers
4k
views
Cannot locate tasks that match ':composeApp:compileJava' as task 'compileJava' is ambiguous in project ':composeApp'
Cannot locate tasks that match ':composeApp:compileJava' as task 'compileJava' is ambiguous in project ':composeApp'. Candidates are: 'compileDebugAndroidTestJavaWithJavac', 'compileDebugJavaWithJavac'...
- 2,484
11
votes
2
answers
3k
views
How to determine build type in kotlin-multiplatform project
I’m working on a multiplaform project, iOS and JVM (I’m not targeting Android directly). Depending on the build type (debug or release) I want to configure the logging level (i.e. to print only errors ...
- 6,976
11
votes
4
answers
13k
views
Ktor: Serialize/Deserialize JSON with List as root in Multiplatform
How can we use kotlin.serialize with Ktor's HttpClient to deserialize/serialize JSON with lists as root? I am creating the HttpClient as follows:
HttpClient {
install(JsonFeature) {
...
- 19.3k
11
votes
2
answers
9k
views
Gradle sync failed: Unsupported method: KotlinPlatformContainer.supports()
I just updated Android Studio to the latest version 3.5.1 and I know get the following error:
Gradle sync failed: Unsupported method:
KotlinPlatformContainer.supports(). The version of Gradle you ...
- 7,210
11
votes
2
answers
5k
views
Execution failed for task ':shared:podInstall'
I am very new to KMM (Kotlin Multiplatform Mobile) and iOS development (including CocoaPods). I have come across the following build error in Android Studio.
Execution failed for task ':shared:...
- 141
11
votes
6
answers
5k
views
Kotlin MPP expect / actual with different signatures
I have a manager class that has an Android and iOS impl (from a 3rd party lib). "ex. MyManagerImpl()". To construct the 3rd party manager, iOS does not require a Context but Android does. I ...
- 3,951
11
votes
3
answers
2k
views
Kotlin Multiplatform library for iOS with bitcode
we use Kotlin to share a library between Android and iOS.
We set up everything, but on iOS i need Bitcode enabled.
After a research I found solution:
kotlin {
targets {
fromPreset(presets.jvm, '...
- 520
11
votes
1
answer
2k
views
Multi-platform InputStream Alternative in Kotlin?
I’m looking for a multi-platform alternative to input streams. My concrete task is to fetch an encrypted file from a remote server via https and decrypt it on demand.
In Java land I would an ...
- 1,833
11
votes
1
answer
5k
views
Multiplatform error when building iosApp: Command PhaseScriptExecution failed with a nonzero exit code
I am working on a multiplatform app in Kotlin on Android Studio and when I try to run the app to an iOS simulator, I get this error:
The following build commands failed:
PhaseScriptExecution [CP-User]...
11
votes
1
answer
3k
views
How to share Java code between Android and JVM targets (with Kotlin Multiplatform)?
I am trying to share Java code between Android and JVM targets using Kotlin Multiplatform feature (sample project: https://github.com/dmitrykolesnikovich/accessJavaCode-issue)
Simply saying, ":...
11
votes
1
answer
6k
views
How to do Unit Testing in Kotlin/Native Multiplatform?
I have follow the tutorial of https://kotlinlang.org/docs/tutorials/native/mpp-ios-android.html and I wanted to Unit testing the commonTest I created in the SharedModule.
Things I tried:
I had tried ...
- 195