Enabling Sign-in APi in Google Developer console

We need to enable Sign-in Api for our application in google developers console to use google sign-in in our application.

1 . first we need to create a project in google developers console

visit google developers console

https://console.developers.google.com/project
2 . Click on create project button you will see the below screen

3 . Enter project name and click CREATE . Then we are directed to project home page which will look like this

4 . Next we need to add Google API to our project. click on library on left menu and search for google api

5 . Configure OAuth consent screen , click on 'OAuth consent screen'

6 . Enter Application name and email id everything else is optional and click save

7 . Configure Credentials
Google uses this to ensure that your application is not fake application . For the purpose of development we use debug certificate. When we deploy our app on play store we need real certificate, steps for geeting it is
https://developer.android.com/tools/publishing/app-signing.html
we only need debug certificate for development , it is identified by SHA1 fingerprint
Steps for getting SHA1
I . SHA1 can be accesed from debug keystore
on mac or linux it is in the ~/.android directory
on windows it is in the c/user/<username>/.android directory
II . Run the following command
on mac/linux open terminal

keytool -list -v -keystore ~/.android/debug.keystore -alias androiddebugkey -storepass android

on windows

keytool -list -v -keystore C:\Users\arun\.android\debug.keystore -alias androiddebugkey -storepass android

III . you will get output like this

you can find SHA1 in the output

If you are not getting output and getting the error in windows
"keytool is not recognized as internal or external command "
click on following link
keytool is not recognized as internal or external commad
now we got our SHA1 , so we can configure credentials
8 . Click o credentials on the left side and you will be asked to create credentials

9 . Click on create credentials , now you will be asked to select a access method select OAuth client ID

10 . Next you will get a screen like this

11 . Select android and enter Name,Package name and SHA1. Package name should be same as your application package name

12 . click on create and your client id will be ready

13 . now you can start coding for your application with google sign in.

click here for creating android  app with google sign-in
Google sign-in in android app

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