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I've just updated my flutter project packages to be null-safety compliant and now Android Studio wants me to update my project to use the latest version of Kotling Gradle Plugin. Can't see where to change this though. I have tried to change
"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
into
"org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.6.10"
but this has no effect.
My
build.grade
-file looks like this:
def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
localPropertiesFile.withReader('UTF-8') { reader ->
localProperties.load(reader)
def flutterRoot = localProperties.getProperty('flutter.sdk')
if (flutterRoot == null) {
throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
flutterVersionCode = '1'
def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
flutterVersionName = '1.0'
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
def keystoreProperties = new Properties()
def keystorePropertiesFile = rootProject.file('key.properties')
if (keystorePropertiesFile.exists()) {
keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
android {
compileSdkVersion 31
sourceSets {
main.java.srcDirs += 'src/main/kotlin'
lintOptions {
disable 'InvalidPackage'
defaultConfig {
// TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
applicationId "*********"
minSdkVersion 30
targetSdkVersion 30
versionCode flutterVersionCode.toInteger()
versionName flutterVersionName
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
signingConfigs {
release {
keyAlias keystoreProperties['keyAlias']
keyPassword keystoreProperties['keyPassword']
storeFile keystoreProperties['storeFile'] ? file(keystoreProperties['storeFile']) : null
storePassword keystoreProperties['storePassword']
buildTypes {
release {
signingConfig signingConfigs.release
flutter {
source '../..'
dependencies {
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test:runner:1.1.1'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
implementation 'com.google.firebase:firebase-analytics:17.2.2'
apply plugin: 'com.google.gms.google-services'
Build output:
BUILD FAILED in 8s
[!] Your project requires a newer version of the Kotlin Gradle plugin.
Find the latest version on https://kotlinlang.org/docs/gradle.html#plugin-and-versions, then update project/android/build.gradle:
ext.kotlin_version = '<latest-version>'
Exception: Gradle task assembleDebug failed with exit code 1
You need to change the kotlin version in your android root project, projectName/android/build.gradle, instead of projectName/android/app/build.gradle.
Change the version at ext.kotlin_version line:
buildscript {
ext.kotlin_version = '1.6.10' // Change here
repositories {
google()
jcenter()
dependencies {
classpath 'com.android.tools.build:gradle:4.1.0'
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
UPDATE
The above solution will also works if your android part of the project is using java where the dependencies are using kotlin and you've encountered the following error:
Incompatible classes were found in dependencies. Remove them from the classpath or use '-Xskip-metadata-version-check' to suppress errors
e: /home/user/.gradle/caches/transforms-3/36814238b86d8b6b6f9e4e1263bce879/transformed/jetified-kotlinx-coroutines-core-jvm-1.5.2.jar!/META-INF/kotlinx-coroutines-core.kotlin_module:
Module was compiled with an incompatible version of Kotlin.
The binary version of its metadata is 1.5.1, expected version is 1.1.15.
AndroidStudio or IntelliJ Idea will give hint in the project build.grade file if the kotlin is not the same with the installed kotlin in the IDE.
–
–
Update your Kotlin to the Latest version. You can see the latest version here
ext.kotlin_version = '1.6.10' //
You can see the latest version of Kotlin from the below link
https://kotlinlang.org/docs/gradle.html#plugin-and-versions
–
You have to change the kotlin version in your android root, go to
projectName/android/build.gradle
buildscript {
ext.kotlin_version = '1.7.0'
repositories {
google()
jcenter()
dependencies {
classpath 'com.android.tools.build:gradle:4.1.0'
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
And change the gradle wrapper version to 6.7.1-all or higher in the gradle-wrapper.properties
distributionUrl=https\://services.gradle.org/distributions/gradle-6.7.1-all.zip
Also you can get the lattest version here
In my case, I don't use kotlin in my flutter project, but some of my dependencies use it (It was assets_audio_player for me), so I had to go to build.gradle for that dependency and update the kotlin version as other answers here:
ext.kotlin_version = '<latest-version>'
Note 1: you can open build.gradle for the library you want by opening the android module in Android Studio then go to Gradle Scripts from Project tab.
Note 2: you can know which library is causing the error by looking at:
Execution failed for task ':assets_audio_player:compileDebugKotlin'.
It could be more than one library, so after you change kotlin version the error will be changed.
–
Change the build gradle version to 4.1.0 or higher in the project-level build.gradle file:
classpath 'com.android.tools.build:gradle:4.1.0'
Change the gradle wrapper version to 6.7-all or higher in the gradle-wrapper.properties file:
distributionUrl=https\://services.gradle.org/distributions/gradle-6.7-all.zip
Change the ext.kotlin_version to 1.6.10 or higher in the project level build.gradle file:
buildscript {
ext.kotlin_version = '1.6.10' // Change like this
repositories {
google()
jcenter()
dependencies {
classpath 'com.android.tools.build:gradle:4.1.0'
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
1- First change ext.kotlin_version on projectName/android/build.gradle
buildscript {
ext.kotlin_version = '1.6.10'
2- Second change build gradle to this :
distributionUrl=https\://services.gradle.org/distributions/gradle-6.7.1-bin.zip
change kotlin version to ext.kotlin_version = '1.8.21' inside android/build.gradle , it fixes your problem.
check all versions here Find Latest Kotlin Version
–
–
A huge solution for updating the Android application is to delete the android folder and then run this:
flutter create .
Note: you can also run flutter upgrade command to upgrade flutter first.
Change ext.kotlin_version on projectName/android/build.gradle
buildscript {
ext.kotlin_version = '1.8.22' //latest version
repositories {
google()
mavenCentral()
dependencies {
classpath 'com.android.tools.build:gradle:7.1.2'
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
You can get the "latest kotlin_version" using the below link
https://kotlinlang.org/docs/gradle-configure-project.html#apply-the-plugin
