First get the Configuration File for Sign-in from

Open link below

https://developers.google.com/identity/sign-in/android/start-integrating

click on get A configuration file

• Enter App name And package name and click on choose and configure services
• provide SHA1 Enable google SIGNIN and generate configuration files

Download the configuration file and place the file in app/ folder of your project

1. Add the dependency to your project-level build.gradle:

classpath ‘com.google.gms:google-services:3.0.0’

1. Add the plugin to your app-level build.gradle:(bottom)

apply plugin: ‘com.google.gms.google-services’

1. add this dependency to your app gradle file

dependencies { compile ‘com.google.android.gms:play-services-auth:9.8.0’ }

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