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Android

Posted by Eric Drake
Eric Drake
6,339 Points

Unable to resolve dependency

I inherited a project from another developer. The project hasn't been touched in a year. When I try to build the project, I get a bunch of "unable to resolve dependency" errors. What do these mean? What is missing from the project? Below are some examples of the build errors I'm getting:

ERROR: Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.google.code.gson:gson:2.8.5.
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Affected Modules: app


ERROR: Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve androidx.constraintlayout:constraintlayout:1.1.3.
Show Details
Affected Modules: app


ERROR: Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.jakewharton:butterknife:10.1.0.
Show Details
Affected Modules: app
Lauren Moineau
Lauren Moineau
9,483 Points

Hi Eric. Could you share your build.gradle files please? Thanks

Eric Drake
Eric Drake
6,339 Points

Here are the build.gradle files:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.infiswift.snakeriver"
        minSdkVersion 21
        versionCode 11
        versionName "2.0.1"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        //targetSdkVersion 25
        targetSdkVersion 28
        maxSdkVersion var
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
        //added to facilitate build
        dexOptions {
            matchingFallbacks = ['release', 'debug']
        }
    }
    /*compileOptions {
        sourceCompatibility 'JavaVersion.VERSION_1_8'
        targetCompatibility 'JavaVersion.VERSION_1_8'
    }*/
    //buildToolsVersion = '28.0.3'
}

dependencies {

    //exclude group: 'com.android.support', module: 'support-annotations'
    implementation 'com.google.code.gson:gson:2.8.5'
    implementation 'com.android.support.constraint:constraint-layout:2.0.0-alpha5'
    implementation 'com.jakewharton:butterknife:10.1.0'
    implementation 'com.android.support:support-core-utils:28.0.0'
    implementation 'com.android.support:support-compat:28.0.0'
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support:cardview-v7:28.0.0'
    implementation 'com.android.support:gridlayout-v7:28.0.0'
    implementation 'com.android.support:recyclerview-v7:28.0.0'
    implementation 'com.android.support:design:28.0.0'
    implementation 'com.afollestad:aesthetic:0.4.7'
    implementation 'com.github.michaelye.easydialog:easydialog:1.4'
    implementation 'com.github.barteksc:android-pdf-viewer:3.0.0-beta.3'

    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.0.2'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'

    annotationProcessor 'com.jakewharton:butterknife-compiler:10.1.0'
}

...and the second one:

ext {
    var = 28
}

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        jcenter()
        google()
    }
    dependencies {
        //classpath 'com.android.tools.build:gradle:3.4.0'
        classpath 'com.android.tools.build:gradle:3.3.2'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        jcenter()

        maven {
            url 'https://maven.google.com'
        }
        google()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

1 Answer

Lauren Moineau
Lauren Moineau
9,483 Points

Hi Eric. You are using both versions of the support library here: AndroidX and the original Support Library. You even have both versions for ConstraintLayout:

implementation 'com.android.support.constraint:constraint-layout:2.0.0-alpha5'
 // (...)
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'

You need to choose the support library you want to use and adjust all your dependencies accordingly (making sure all your 3rd party libraries can run on AndroidX if that's what you decide to go with). So the dependencies should start with

- com.android.support:   // if you choose the Support Library
- androidx.    // if you choose the AndroidX library

Keep in mind that the version 10.* of Butterknife only works with AndroidX, so if you decide to use the original Support Library, you will have to use the version 9.* instead

Also, in your build.gradle file (Project), you do not need the maven repository shortcut there as you already have the google() one which points to the same thing.

allprojects {
    repositories {
        jcenter()  // keep
        google()   // keep
        maven {    // remove
            url 'https://maven.google.com'
        }        
    }
}

Hope that helps :)

Eric Drake
Eric Drake
6,339 Points

Thank you for all of your help.

Lauren Moineau
Lauren Moineau
9,483 Points

You're welcome :)