How to Resolve \"Failed to Resolve com.google.android.gms:play-services-auth:11.4.0\" Error in FirebaseUI Auth?

"Failed to Resolve com.google.android.gms:play-services-auth:11.4.0"

When attempting to implement FirebaseUI — Auth in an Android project, developers may encounter this error message during compilation: "Failed to resolve com.google.android.gms:play-services-auth:11.4.0." This error typically indicates a missing or incorrect dependency configuration in the project's build scripts.

To resolve this issue, developers can follow these steps:

1. Add Maven Repository: The project's root-level build.gradle file should include the following configuration:

   allprojects {
       repositories {
           jcenter()
           maven {
               url "https://maven.google.com"
           }
       }
   }

   This repository is essential for resolving Google Play Services dependencies.

2. Verify Version Consistency: Ensure that all Firebase and Google Play Services libraries use the same version. The following should be updated accordingly:

   compile 'com.google.firebase:firebase-database:11.0.4'
   compile 'com.google.firebase:firebase-auth:11.0.4'
   compile 'com.google.android.gms:play-services-auth:11.4.0'

3. Update Google Play Services Gradle Plugin (Optional): Ensure that the latest version of the Google Play Services Gradle plugin (at least 3.3.1) is being used:

   classpath 'com.google.gms:google-services:4.0.1'

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