Android 9 Development Cookbook - Third Edition

How it works...

Google has made it relatively easy to add Google sign-in with their GoogleSignInClient and GoogleSignInOptions APIs. First, we create a GoogleSignInOptions object with the builder. This is where we specify the sign-in options we want, such as requesting email ID. Then, call the GoogleSignIn.getClient() method to get the GoogleSignInClient.

When the user clicks on the Google sign-in button (created with the com.google.android.gms.common.SignInButton class), we send an Intent for GoogleSignInApi to the handle. We process the result in onActivityResult(). If the sign-in was successful, we can get the account details. In our example, we just get the email, but additional information is available such as the following:

• getDisplayName() ...