I am unable to import Kotlin serialization, I think I have followed the instructions from the Kotlin docs but when I use the @Serializable
annotation I get the following warning:
kotlinx.serialization compiler plugin is not applied to the module, so this annotation would not be processed. Make sure that you've setup your buildscript correctly and re-import project.
Here is my project level build.gradle:
buildscript {
ext {
compose_version = '1.5.5'
kotlin_version = '1.9.20'
}
}// Top-level build file where you can add configuration options common to all sub-projects/modules.
plugins {
id 'com.android.application' version '8.1.4' apply false
id 'com.android.library' version '8.1.4' apply false
id 'org.jetbrains.kotlin.android' version "$kotlin_version" apply false
id 'org.jetbrains.kotlin.plugin.serialization' version "$kotlin_version" apply false
}
I created a new module cannotimportserialization just for sanity check and here is the module level (cannotimportserialization) build.gradle file
plugins {
id 'com.android.application'
id 'org.jetbrains.kotlin.android'
id 'org.jetbrains.kotlin.plugin.serialization'
}
android {
namespace 'com.example.cannotimportserialization'
compileSdk 34
defaultConfig {
applicationId "com.example.cannotimportserialization"
minSdk 29
targetSdk 34
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
vectorDrawables {
useSupportLibrary true
}
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
kotlinOptions {
jvmTarget = '1.8'
}
buildFeatures {
compose true
}
composeOptions {
kotlinCompilerExtensionVersion '1.4.3'
}
packaging {
resources {
excludes += '/META-INF/{AL2.0,LGPL2.1}'
}
}
}
dependencies {
implementation 'androidx.core:core-ktx:1.9.0'
implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.6.2'
implementation 'androidx.activity:activity-compose:1.8.1'
implementation platform('androidx.compose:compose-bom:2023.03.00')
implementation 'androidx.compose.ui:ui'
implementation 'androidx.compose.ui:ui-graphics'
implementation 'androidx.compose.ui:ui-tooling-preview'
implementation 'androidx.compose.material3:material3'
testImplementation 'junit:junit:4.13.2'
androidTestImplementation 'androidx.test.ext:junit:1.1.5'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
androidTestImplementation platform('androidx.compose:compose-bom:2023.03.00')
androidTestImplementation 'androidx.compose.ui:ui-test-junit4'
debugImplementation 'androidx.compose.ui:ui-tooling'
debugImplementation 'androidx.compose.ui:ui-test-manifest'
implementation "org.jetbrains.kotlinx:kotlinx-serialization-json:1.6.2"
}
Here is the project level settings.gradle:
pluginManagement {
repositories {
gradlePluginPortal()
google()
mavenCentral()
}
}
dependencyResolutionManagement {
repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
repositories {
google()
mavenCentral()
}
}
rootProject.name = "Test Project"
include ':app'
include ':cannotimportserialization'
What do I do here to apply the compiler plugin to the module?
Based on the response from the developers in the GitHub issue, it's a problem with Kotlin plugin for Android Studio.
As I understand, this problem will be present if the plugin version looks like this: 231-1.9.10-release-459-AS9392.1.2311.11076708
(1.9.10
is the key part). You can check it in Settings -> Languages & Frameworks -> Kotlin
.
Solutions (from the same response):
To fix this problem, you need to update the Kotlin IDE plugin. Unfortunately, 1.9.20 IDE plugin version is not available for Hedgehog 2023.1.1 yet. There are two ways to fix it:
- Go to Settings -> Languages & Frameworks -> Kotlin or invoke action Configure Kotlin plugin updates. Select EAP channel in the window and update to 1.9.20-RC2 (per https://youtrack.jetbrains.com/issue/KTIJ-10755/HMPP-IDE-False-PLUGINISNOTENABLED-in-IDE-for-kotlinx-serialization-plugin-however-project-builds-correctly#focus=Comments-27-8389206.0-0)
- Update to Android Studio Iguana 2023.2.1 Canary or Intellij IDEA 2023.3 that have Kotlin 1.9.20 pre-installed.