firebase-core:12.0.1 not found

Question

I have created a firebase project and it says I have to modify the core version to 12 according to the picture

The default code is 9.6.1. So, I changed that number to 12.0.1

compile 'com.google.firebase:firebase-core:12.0.1'

However, the sync failed with the following error

Failed to resolve: com.google.firebase:firebase-core:12.0.1

What should I do?

Answer 1

Update the gms plugin:

classpath 'com.google.gms:google-services:4.0.0' // google-services plugin

and the firebase lib:

 implementation 'com.google.firebase:firebase-core:16.0.0'

Also add google maven to your build.gradle file:

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

Answer 2

com.google.firebase:firebase-core:12.0.1 is old version already.

You can try version 15.0.0 or as Levi Albuquerque said 16.0.0

However just to remind you that if you implement more than one same kind of library, they should be always in the same version to avoid any syncing error.

Example

implementation 'com.google.firebase:firebase-auth:15.0.0'
implementation 'com.google.firebase:firebase-storage:15.0.0'
implementation 'com.google.firebase:firebase-database:15.0.0' 

All are same version 15.0.0