[android] How to add google-services.json in Android?

The error is:

File google-services.json is missing from module root folder. The Google Quickstart Plugin cannot function without it.

This error indicates your package_name in your google-services.json might be wrong. I personally had this issue when I used

buildTypes {
    ...

    debug {
        applicationIdSuffix '.debug'
    }
}

in my build.gradle. So, when I wanted to debug, the name of the application was ("all of a sudden") app.something.debug instead of app.something. I was able to run the debug when I changed the said package_name...

For using Google SignIn in Android app, you need

google-services.json

which you can generate using the instruction mentioned here

WINDOWS

1. Open Terminal window in Android Studio (Alt+F12 or View->Tool Windows->Terminal). Then type

"move file_path/google-services.json app/"

without double quotes.

eg

move C:\Users\siva\Downloads\google-services.json app/

LINUX

1. Open Android Studio Terminal and type this

scp file_path/google-services.json app/

eg:

scp '/home/developer/Desktop/google-services.json' 'app/'

1. Download the "google-service.json" file from Firebase
2. Go to this address in windows explorer "C:\Users\Your-Username\AndroidStudioProjects" You will see a list of your Android Studio projects
3. Open a desired project, navigate to "app" folder and paste the .json file
4. Go to Android Studio and click on "Sync with file system", located in dropdown menu (File>Sync with file system)
5. Now sync with Gradle and everything should be fine

google-services.json file work like API keys means it store your project_id and api key with json format for all google services(Which enable by you at google console) so no need manage all at different places.

Important process when uses google-services.json

at application gradle you should add

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

at top level gradle you should add below dependency

  dependencies {
        // Add this line
        classpath 'com.google.gms:google-services:3.0.0'
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }

The document says:

Copy the file into the app/ folder of your Android Studio project, or into the app/src/{build_type} folder if you are using multiple build types.

Click right above the app i.e android(drop down list) in android studio.Select the Project from drop down and paste the json file by right click over the app package and then sync it....

Instead of putting in root folder as given in docs of firebase, just copy the google-json file in the projectname/app 's root folder and it works fine then . Its just simple !

It should be on Project -> app folder

Please find the screenshot from Firebase website