How to solve Firebase API initialization failure (Android + Firebase)

Question

I recently needed to use Google GCM in my project. From its website it is said:

Firebase Cloud Messaging (FCM) is the new version of GCM. It inherits

Answer 1

Well, after struggle a lot I found what was causing my problem. Basically I had two libraries modules - that happened to be of my own - each one of them importing different versions of com.android.support:appcompat-v7.* and google play services. Made all of them import the same version and problem is gone.

Answer 2

In My case i forgot to add this with in App Level build

implementation 'com.google.firebase:firebase-messaging:9.6.0'

So i got the FireBase firebase-api-initialization-failure

Answer 3

I met the same error, solved by upgrade firebase-core:

dependencies {    
    compile 'com.google.firebase:firebase-core:9.0.2'
}

Answer 4

add compile 'com.google.android.gms:play-services:9.0.0' into your app level build.gradle file

Answer 5

I faced the Same Issue, but after some r & d and I came to known the problem was in Gradle i.e,

compile "com.android.support:support-v4:+"

---

then I just removed the + and replaced actual version ie,

compile "com.android.support:support-v4:23.1.0"

---

then it started working

Answer 6

You can check the dependencies with gradle command

./gradlew app:dependencies

As Edgar said ensure that all the dependency libraries has same version. If not then you can exclude that dependency using

compile('your dependency') {
    exclude group: 'lib to be removed'
}

And add that dependency yourself.