Google Sign In – Android – Java Code

package com.zakasoft.ilovebangladeshquiz;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;

import com.google.android.gms.auth.api.Auth;
import com.google.android.gms.auth.api.signin.GoogleSignIn;
import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
import com.google.android.gms.auth.api.signin.GoogleSignInClient;
import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
import com.google.android.gms.auth.api.signin.GoogleSignInResult;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.SignInButton;
import com.google.android.gms.common.api.ApiException;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.tasks.Task;
import com.zakasoft.ilovebangladeshquiz.databinding.ActivityMainBinding;

import androidx.activity.result.ActivityResult;
import androidx.activity.result.ActivityResultCallback;
import androidx.activity.result.ActivityResultLauncher;
import androidx.activity.result.contract.ActivityResultContract;
import androidx.activity.result.contract.ActivityResultContracts;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import static android.content.ContentValues.TAG;

public class GoogleLoginActivity extends AppCompatActivity {


    GoogleSignInClient mGoogleSignInClient;
    SignInButton signInButton;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


        //binding = ActivityMainBinding.inflate(getLayoutInflater());
        setContentView(R.layout.googlelogin_activity);
        signInButton = (SignInButton)findViewById(R.id.sign_in_button);
        // Configure sign-in to request the user's ID, email address, and basic
// profile. ID and basic profile are included in DEFAULT_SIGN_IN.
        GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestEmail()
                .build();

        // Build a GoogleSignInClient with the options specified by gso.
        mGoogleSignInClient = GoogleSignIn.getClient(this, gso);

// Check for existing Google Sign In account, if the user is already signed in
// the GoogleSignInAccount will be non-null.
        GoogleSignInAccount account = GoogleSignIn.getLastSignedInAccount(this);

        signInButton.setSize(SignInButton.SIZE_STANDARD);
        //findViewById(R.id.sign_in_button).setOnClickListener((View.OnClickListener) this);

        signInButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                signIn();
            }
        });
        //updateUI(account);

    }



    private void signIn() {
        Intent signInIntent = mGoogleSignInClient.getSignInIntent();
        startActivityForResult.launch(signInIntent);

    }

    ActivityResultLauncher<Intent> startActivityForResult = registerForActivityResult(

            new ActivityResultContracts.StartActivityForResult(),
            result -> {
                if(result.getResultCode() == Activity.RESULT_OK){
                    Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(result.getData());
                    handleSignInResult(task);
                }
            }
    );

    private void handleSignInResult(Task<GoogleSignInAccount> completedTask) {
        try {
            GoogleSignInAccount acct = completedTask.getResult(ApiException.class);

            if (acct != null)
            {
                String personName = acct.getDisplayName();
                String personGivenName = acct.getGivenName();
                String personFamilyName = acct.getFamilyName();
                String personEmail = acct.getEmail();
                String personId = acct.getId();
                //Uri personPhoto = acct.getPhotoUrl();
                Toast.makeText(getApplicationContext(),personName + personGivenName + personFamilyName + personEmail + personId,Toast.LENGTH_LONG ).show();
            }
            // Signed in successfully, show authenticated UI.
            //updateUI(account);
        } catch (ApiException e) {
            // The ApiException status code indicates the detailed failure reason.
            // Please refer to the GoogleSignInStatusCodes class reference for more information.
            Log.w(TAG, "signInResult:failed code=" + e.getStatusCode());
            //updateUI(null);
        }
    }


}


<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/relativeLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >

    <com.google.android.gms.common.SignInButton
        android:id="@+id/sign_in_button"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

implementation 'com.google.android.gms:play-services-auth:19.0.0'

Generate Sha-1 using keytook
---
test using the signed apk

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