Android Gradle Plugin Error: Failed to resolve variable

Question

I downloaded and opened a starter code for an Android online course I'm following. The project builds fine but when I run the project I get the following errors.

[TAG] Failed to resolve variable '${junit.version}'
[TAG] Failed to resolve variable '${animal.sniffer.version}'
[TAG] Failed to resolve variable '${project.version}'

I am new to android development and android studio so I do not even know where to start troubleshooting. After checking out some of the questions I happen to understand these type of problems are usually associated with the buil.gradle file so I am including that here.

This is my Build Gradle

apply plugin: 'com.android.application'

apply plugin: 'kotlin-android'

apply plugin: 'kotlin-kapt'

android {
    compileSdkVersion 28
    dataBinding {
        enabled = true
    }
    defaultConfig {
        applicationId 'com.example.android.navigation'
        minSdkVersion 19
        targetSdkVersion 28
        vectorDrawables.useSupportLibrary = true
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    productFlavors {
    }
}

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    // Kotlin
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$version_kotlin"

    // Constraint Layout
    implementation "androidx.constraintlayout:constraintlayout:$version_constraint_layout"

    // Core
    implementation "androidx.core:core:$version_core"

    // Material Design
    implementation "com.google.android.material:material:$version_material"
}

Any help would be highly appreciated, at least even how to locate the cause when I get this type of an error.

Umesh AHIR · Accepted Answer · 2019-07-19 08:38:30Z

2

Add version number in same line instead of $version...

like for your all dependencies

implementation 'androidx.constraintlayout:constraintlayout:1.1.3'

answered Jul 19, 2019 at 8:38

Umesh AHIR

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Comments

the_lone_wolf · Accepted Answer · 2019-07-19 12:09:51Z

1

You need to specify the versions of the libraries and the materials you are using . Instead of $version_kotlin replace it with the latest version of the Kotlin. Do the similar for all the lines.

answered Jul 19, 2019 at 12:09

the_lone_wolf

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Comments

Joseph Cole · Accepted Answer · 2019-07-19 17:45:11Z

You didn't specify the versions of the libraries

Replace the $version_kotin :

apply plugin: 'kotlin-kapt'

android {
    compileSdkVersion 28
    dataBinding {
        enabled = true
    }
    defaultConfig {
        applicationId 'com.example.android.navigation'
        minSdkVersion 19
        targetSdkVersion 28
        vectorDrawables.useSupportLibrary = true
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    productFlavors {
    }
}

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    // Kotlin
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.0"
    // Constraint Layout
    implementation "androidx.constraintlayout:constraintlayout:1.1.3"
    // Core
    implementation "androidx.core:core:1.0.1"
    // Material Design
    implementation "com.google.android.material:material:1.1.0-alpha06"
}

I hope this helps....

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