Google login in android java

1. Refer to how to integrate firebase to your android project.

https://medium.com/@hasperong/integrate-firebase-with-android-ef138841add0

1. Add in gradle for deependencies google

implementation("com.google.android.gms:play-services-auth:20.7.0")

2. Method to call gmail login.

private BeginSignInRequest signInRequest;
private SignInClient oneTapClient;

private void googleSignin(){
    oneTapClient = Identity.getSignInClient(this);
    signInRequest = BeginSignInRequest.builder()
            .setGoogleIdTokenRequestOptions(BeginSignInRequest.GoogleIdTokenRequestOptions.builder()
                    .setSupported(true)
                    // Your server's client ID, not your Android client ID.
                    .setServerClientId("yourserverclientId")
                    // Only show accounts previously used to sign in.
                    .setFilterByAuthorizedAccounts(false)
                    .build())
            .build();

    oneTapClient.beginSignIn(signInRequest)
            .addOnSuccessListener(this, new OnSuccessListener<BeginSignInResult>() {
                @Override
                public void onSuccess(BeginSignInResult result) {
                    try {
                        startIntentSenderForResult(
                                result.getPendingIntent().getIntentSender(), REQ_ONE_TAP,
                                null, 0, 0, 0);
                    } catch (IntentSender.SendIntentException e) {
                        Log.e(TAG…