
NaplesDave
PragProg Customers Kotlin and Android Development: pg. 8 Build Gradle error: Could not get unknown property 'kotlin_version'
I am using Android Studio Chipmunk | 2021.2.1 Patch 2
Build #AI-212.5712.43.2112.8815526, built on July 10, 2022
Runtime version: 11.0.12+0-b1504.28-7817840 x86_64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.
macOS 12.5.1
GC: G1 Young Generation, G1 Old Generation
Memory: 2048M
Cores: 16
Registry: external.system.auto.import.disabled=true
Non-Bundled Plugins: com.kite.intellij (1.9.4), org.intellij.plugins.markdown (212.5457.16), Dart (212.5744), com.thoughtworks.gauge (212.4746.52), org.jetbrains.kotlin (212-1.7.10-release-333-AS5457.46), io.flutter (69.0.2)
Penny Drop App , will not build.
I made the gradle additions to the Module gradle file and it will not build. It does not seem to know about the property ‘kotlin_version’. I saw the previous post about it, but honestly, I don’t see how to fix it there.
My gradle "project file looks like this;
// Top-level build file where you can add configuration options common to all sub-projects/modules.
plugins {
id 'com.android.application' version '7.2.2' apply false
id 'com.android.library' version '7.2.2' apply false
id 'org.jetbrains.kotlin.android' version '1.7.10' apply false
}
task clean(type: Delete) {
delete rootProject.buildDir
}
And my gradle “Module” file looks like this;
plugins {
id 'com.android.application'
id 'org.jetbrains.kotlin.android'
}
android {
compileSdk 32
defaultConfig {
applicationId "com.example.pennydrop"
minSdk 26
targetSdk 32
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
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'
}
}
dependencies {
implementation fileTree(dir: "libs", include: ["*.jar"])
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
implementation 'androidx.core:core-ktx:1.8.0'
implementation 'androidx.appcompat:appcompat:1.5.0'
implementation 'com.google.android.material:material:1.6.1'
implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
testImplementation 'junit:junit:4.13.2'
androidTestImplementation 'androidx.test.ext:junit:1.1.3'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
}```
First Post!

mfazio23
Hey Dave!
This was a fun change Google made just after the book was published: the kotlin_version
property is no longer automatically included when you create a project.
What used to happen is that you’d get a buildscript { ... }
block in your project-level build.gradle
file with an ext { ... }
inside. This block contained any variables you wanted to use in your Gradle scripts.
You can either create this section in that project-level build.gradle
file:
buildscript {
ext {
kotlin_version = '1.7.10'
// Other variables can live here
}
// Other blocks can be here
}
Otherwise, you can change the kotlin-stdlib-jdk8
dependency to include the Kotlin version rather than use the variable:
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.7.10"
Also, with newer versions of Kotlin, you should be able to exclude the explicit Kotlin dependency altogether.
Let me know if that works!
Michael
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