Hello everyone, I'm going through <getting started...

# getting-started

[Iunir Iakupov]

Hello everyone,
I'm going through getting started with KMP and stuck on step Introduce a view model in 5th section.
Dependency is not found:

implementation(libs.androidx.lifecycle.viewmodel.compose)

How to fix it? Sorry for stupid question, but I've spent too much time on that already.

[CLOVIS]

Hey, can you check that you have a line that looks like

androidx-lifecycle-viewmodel-compose = { … }

in the file gradle/libs.versions.toml ? It should be in the [libraries] section.

[CLOVIS]

The "Gradle project sync failed" is probably the source of your issue; when the IDE cannot communicate with Gradle, weird things tend to happen. You should have more info on what went wrong in the "Build" toolbar on the bottom left of IntelliJ/Android Studio.

[Iunir Iakupov]

@CLOVIS thanks for quick reply. I've checked libs.versions file and I don't have that line:

[Iunir Iakupov]

Executing tasks: [:composeApp:assembleDebug, :composeApp:assembleDebugUnitTest, :composeApp:assembleDebugAndroidTest] in project /Users/iuniriakupov/git/KotlinProject

Type-safe project accessors is an incubating feature.

> Configure project :composeApp
e: file:///Users/iuniriakupov/git/KotlinProject/composeApp/build.gradle.kts:38:42: Unresolved reference: lifecycle
w: Missing 'androidTarget()' Kotlin target in multiplatform project 'composeApp (:composeApp)'.
The Android Gradle plugin was applied without creating a corresponding 'android()' Kotlin Target:

plugins {
id("com.android.application")
kotlin("multiplatform")
}

kotlin {
androidTarget() // <-- please register this Android target
}

FAILURE: Build completed with 2 failures.

1: Task failed with an exception.
-----------
* Where:
Build file '/Users/iuniriakupov/git/KotlinProject/composeApp/build.gradle.kts' line: 38

* What went wrong:
Script compilation error:

  Line 38:             implementation(libs.androidx.lifecycle.viewmodel.compose)
                                                    ^ Unresolved reference: lifecycle

1 error

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.
> Get more help at <https://help.gradle.org>.
==============================================================================

2: Task failed with an exception.
-----------
* Where:
Build file '/Users/iuniriakupov/git/KotlinProject/composeApp/build.gradle.kts' line: 38

* What went wrong:
Script compilation error:

  Line 38:             implementation(libs.androidx.lifecycle.viewmodel.compose)
                                                    ^ Unresolved reference: lifecycle

1 error

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.
> Get more help at <https://help.gradle.org>.
==============================================================================

Deprecated Gradle features were used in this build, making it incompatible with Gradle 9.0.

You can use '--warning-mode all' to show the individual deprecation warnings and determine if they come from your own scripts or plugins.

For more on this, please refer to <https://docs.gradle.org/8.4/userguide/command_line_interface.html#sec:command_line_warnings> in the Gradle documentation.

BUILD FAILED in 1s

[Iunir Iakupov]

Not sure what is useful there

[CLOVIS]

That's probably your problem 😕

The latest version would be

androidx-lifecycle-viewmodel-compose = { module = "androidx.lifecycle:lifecycle-viewmodel-compose", version = "2.7.0" }

but I have no idea which version the sample is written for. You can find the full list here: https://androidx.tech/artifacts/lifecycle/lifecycle-viewmodel-compose/

[CLOVIS]

* What went wrong:

Script compilation error:

Line 38: implementation(libs.androidx.lifecycle.viewmodel.compose)

^ Unresolved reference: lifecycle

1 error

This is the interesting part 🙂 But well, it's not teaching us much except that IntelliJ and Gradle agree on what's wrong, which probably means the only issue is the missing lifecycle dependency.

[Iunir Iakupov]

Thanks a lot

[CLOVIS]

I don't know much about AndroidX lifecycle, so if that version doesn't work I'm afraid I won't be able to help much more. In that case, probably ask a more specific question in #compose-android.

If that does fix it, please report it to https://kotl.in/issue, it's not great that the sample has missing dependencies 😅

[Iunir Iakupov]

Sure. Thanks again. Have a good evening.

[Joel Denke]

Did you add this in commonMain or androidMain deps block? Because Androidx viewmodel not supported in KMP, only Android.

[Iunir Iakupov]

@Joel Denke ./KotlinProject/composeApp/build.gradle.kts

[Joel Denke]

Yeah sorry missed that part. How does Toml file look now?

[Iunir Iakupov]

After manually adding the line with androidx-lifecycle-viewmodel-compose

[versions]
agp = "8.2.2"
android-compileSdk = "34"
android-minSdk = "24"
android-targetSdk = "34"
androidx-activityCompose = "1.8.2"
androidx-appcompat = "1.6.1"
androidx-constraintlayout = "2.1.4"
androidx-core-ktx = "1.12.0"
androidx-espresso-core = "3.5.1"
androidx-material = "1.11.0"
androidx-test-junit = "1.1.5"
compose = "1.5.4"
compose-compiler = "1.5.8"
compose-plugin = "1.6.0-alpha01"
junit = "4.13.2"
kotlin = "1.9.21"
ktor = "2.3.7"
logback = "1.4.14"

[libraries]
kotlin-test = { module = "org.jetbrains.kotlin:kotlin-test", version.ref = "kotlin" }
kotlin-test-junit = { module = "org.jetbrains.kotlin:kotlin-test-junit", version.ref = "kotlin" }
junit = { group = "junit", name = "junit", version.ref = "junit" }
androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "androidx-core-ktx" }
androidx-test-junit = { group = "androidx.test.ext", name = "junit", version.ref = "androidx-test-junit" }
androidx-espresso-core = { group = "androidx.test.espresso", name = "espresso-core", version.ref = "androidx-espresso-core" }
androidx-appcompat = { group = "androidx.appcompat", name = "appcompat", version.ref = "androidx-appcompat" }
androidx-material = { group = "com.google.android.material", name = "material", version.ref = "androidx-material" }
androidx-constraintlayout = { group = "androidx.constraintlayout", name = "constraintlayout", version.ref = "androidx-constraintlayout" }
androidx-lifecycle-viewmodel-compose = { module = "androidx.lifecycle:lifecycle-viewmodel-compose", version = "2.7.0" }
androidx-activity-compose = { module = "androidx.activity:activity-compose", version.ref = "androidx-activityCompose" }
compose-ui = { module = "androidx.compose.ui:ui", version.ref = "compose" }
compose-ui-tooling = { module = "androidx.compose.ui:ui-tooling", version.ref = "compose" }
compose-ui-tooling-preview = { module = "androidx.compose.ui:ui-tooling-preview", version.ref = "compose" }
compose-foundation = { module = "androidx.compose.foundation:foundation", version.ref = "compose" }
compose-material = { module = "androidx.compose.material:material", version.ref = "compose" }
logback = { module = "ch.qos.logback:logback-classic", version.ref = "logback" }
ktor-server-core = { module = "io.ktor:ktor-server-core-jvm", version.ref = "ktor" }
ktor-server-netty = { module = "io.ktor:ktor-server-netty-jvm", version.ref = "ktor" }
ktor-server-tests = { module = "io.ktor:ktor-server-tests-jvm", version.ref = "ktor" }

[plugins]
androidApplication = { id = "com.android.application", version.ref = "agp" }
androidLibrary = { id = "com.android.library", version.ref = "agp" }
jetbrainsCompose = { id = "org.jetbrains.compose", version.ref = "compose-plugin" }
kotlinJvm = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlin" }
ktor = { id = "io.ktor.plugin", version.ref = "ktor" }
kotlinMultiplatform = { id = "org.jetbrains.kotlin.multiplatform", version.ref = "kotlin" }

[Iunir Iakupov]

BTW, after that fix it's not complaining anymore about gradle file, but still cannot build:

[Joel Denke]

Have you tried rebuild app? Sometimes need reset all in Gradle and rebuild.
In your case looks like also having additional errors in App.kt. sometimes one error can trigger chained ones.

[Iunir Iakupov]

I've decided to try again this tutorial from very beginning and found mismatch of paths, probably this is root cause.
Here it refer to App.kt file in composeApp/src/androidMain/kotlin

But in fact it's not there. It's in the composeApp/src/commonMain/kotlin

[Iunir Iakupov]

I've created the ticket for that:
https://youtrack.jetbrains.com/issue/KT-65656/App.kt-location-mismatch-with-KMP-tutorial

[CLOVIS]

Did moving App.kt fix it? If not, can you show us the contents of App.kt ?

[Joel Denke]

Also in the ticket you say something else than saying here it sounds like. From what I can see youre trying to create a ViewModel with android target required, and try using it in commonMain, thats not possible, because androidx viewmodel not supported in KMP, only in Android targets.

[Joel Denke]

To solve that need to create an actual/expect ViewModel in commonMain like expect class MyViewModel and then only inherit from androidx.viewModel.ViewModel in androidMain.
Then you can use it in commonMain from App 🙂

[Joel Denke]

I did read through the guide again now and oboy its confusing 😄 You get App.kt in commonMain from the wizard, but guide for Android says create App.kt in androidMain.
@Iunir Iakupov If you would like to I can help you in DM, I think I need quite a lot of input not fit into a thread here 😛

[Joel Denke]

You can also check this library https://github.com/rickclephas/KMM-ViewModel doing most of this for you. They use the technique I mention here:
https://github.com/rickclephas/KMM-ViewModel/blob/master/kmm-viewmodel-core/src/androidMain/kotlin/com/rickclephas/kmm/viewmodel/KMMViewModel.kt

[Iunir Iakupov]

Moving App.kt fixed it. Thank you all for helping me!

[Joel Denke]

No worries, just glad I could help 🙂 Quite tricky tutorial.

[Richie Rodríguez]

I have had de very same problem

[Richie Rodríguez]

After monkey typing like a madman, I found the unresolved reference is related to the android gradle plugin (AGP) version

[Richie Rodríguez]

just check the contents of the project_path/gradle/libs.versions.toml, I got the project compiling/running after downgrading agp version from "8.2.0" to "8.1.4"

[Richie Rodríguez]

hope this helps