Build Gradle Dependencies Version Conflict

Question

I’m trying to use Firebase in my application, but it’s giving dependency error in Gradle.

Build.Radle (App)

apply plugin: 'com.android.application'

apply plugin: 'kotlin-android'

apply plugin: 'kotlin-android-extensions'

android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "com.juny.tinderx"
        minSdkVersion 19
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'),     'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation"org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
    implementation 'com.google.firebase:firebase-auth:11.8.0'
    implementation 'com.google.firebase:firebase-database:11.8.0'
}

apply plugin: 'com.google.gms.google-services'

Build.Radle(project)

buildscript {
   ext.kotlin_version = '1.2.30'
   repositories {
       google()
       jcenter()
   }
   dependencies {
       classpath 'com.android.tools.build:gradle:3.1.1'
       classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
       classpath 'com.google.gms:google-services:3.2.0'
       // NOTE: Do not place your application dependencies here; they belong
       // in the individual module build.gradle files
   }
}

allprojects {
    repositories {
        google()
        jcenter()
        maven {
            url "https://maven.google.com" // Google's Maven repository
        }

    }
}

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

That is the Mistake that:

Answer 1

In its dependency tree there are references to older versions of firebase, which refer to play-services-based:11.6.0 which use the older support library (25.2). They should refer to version 11.8.0 which is expected to :-) use version 27.1.1 of the support library:

+--- com.google.firebase:firebase-auth:11.6.0
|    +--- com.google.android.gms:play-services-base:11.6.0
|    |    +--- com.google.android.gms:play-services-basement:11.6.0
|    |    |    +--- com.android.support:support-v4:25.2.0
|    |    |    |    +--- com.android.support:support-compat:25.2.0 -> 27.1.1 (*)
|    |    |    |    +--- com.android.support:support-media-compat:25.2.0
|    |    |    |    |    +--- com.android.support:support-annotations:25.2.0 -> 27.1.1
|    |    |    |    |    \--- com.android.support:support-compat:25.2.0 -> 27.1.1 (*)

You need to ensure that you are using the newest Firebase library (and others, if applicable) so that everyone internally uses the latest version of the support library.

There are ways to force the use of the latest version, both with generic script and manually (an example where this is needed is in the integration with the Facebook library that is never in the newer version of the support library), however, as in your case your project is starting, still without many dependencies, the best option is to always ensure that you are using all the newer versions of the libraries involved, even more when they are from Google itself.

Answer 2

In your Radle dependencies put this:

//Resolve conflitos da lib support
configurations.all {
    resolutionStrategy.eachDependency { DependencyResolveDetails details ->
        if (details.requested.group == 'com.android.support') {
            details.useVersion "27.1.0"
        }
    }
}