Gradle failed to resolve com.google.android.gms:play-services-auth:11.6.0 [duplicate]

Answer 1

Make sure that you have downloaded GooglePlay Services in SDK Manager

Please, move this line :

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

at the end of the gradle file (it MUST be at the end)

Also, you may upgrade versions :

classpath 'com.android.tools.build:gradle:3.0.0'
classpath 'com.google.gms:google-services:3.1.1'

Add also google() in repositories :

 buildscript {
        repositories {
            jcenter()
            google()
        }

        dependencies {
            classpath 'com.android.tools.build:gradle:2.2.3'
            classpath 'com.google.gms:google-services:3.1.0'}
        }
    }

    allprojects {
        repositories {
            jcenter() 
            google()
        }
    }

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