Firebase Login with Google (youtube tutorial)

ic_firebase_logo.xml

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ic_google_logo.xml

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    android:viewportHeight="500"
    android:viewportWidth="500"
    android:width="42dp" xmlns:android="http://schemas.android.com/apk/res/android">
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        android:fillType="nonZero"
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MainActivity.java

//package com.haerulmuttaqin.firebaselogin;

import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

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.common.api.ApiException;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthCredential;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.auth.GoogleAuthProvider;
import com.squareup.picasso.Picasso;

public class LoginActivity extends AppCompatActivity {

    static final int GOOGLE_SIGN_IN = 123;
    FirebaseAuth mAuth;
    Button btn_login, btn_logout;
    TextView text;
    ImageView image;
    ProgressBar progressBar;
    GoogleSignInClient mGoogleSignInClient;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        btn_login = findViewById(R.id.login);
        btn_logout = findViewById(R.id.logout);
        text = findViewById(R.id.text);
        image = findViewById(R.id.image);
        progressBar = findViewById(R.id.progress_circular);

        mAuth = FirebaseAuth.getInstance();

        GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestIdToken(getString(R.string.default_web_client_id))
                .requestEmail()
                .build();

        mGoogleSignInClient = GoogleSignIn.getClient(this, gso);

        btn_login.setOnClickListener(v -> SignInGoogle());
        btn_logout.setOnClickListener(v -> Logout());

        if (mAuth.getCurrentUser() != null) {
            FirebaseUser user = mAuth.getCurrentUser();
            updateUI(user);
        }
    }

    public void SignInGoogle() {
        progressBar.setVisibility(View.VISIBLE);
        Intent signInIntent = mGoogleSignInClient.getSignInIntent();
        startActivityForResult(signInIntent, GOOGLE_SIGN_IN);
    }

    private void firebaseAuthWithGoogle(GoogleSignInAccount acct) {
        Log.d("TAG", "firebaseAuthWithGoogle:" + acct.getId());

        AuthCredential credential = GoogleAuthProvider.getCredential(acct.getIdToken(), null);
        mAuth.signInWithCredential(credential)
                .addOnCompleteListener(this, task -> {
                    if (task.isSuccessful()) {
                        progressBar.setVisibility(View.INVISIBLE);

                        Log.d("TAG", "signInWithCredential:success");

                        FirebaseUser user = mAuth.getCurrentUser();
                        updateUI(user);
                    } else {
                        progressBar.setVisibility(View.INVISIBLE);

                        Log.w("TAG", "signInWithCredential:failure", task.getException());

                        Toast.makeText(LoginActivity.this, "Authentication failed.",
                                Toast.LENGTH_SHORT).show();
                        updateUI(null);
                    }
                });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == GOOGLE_SIGN_IN) {
            Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
            try {
                GoogleSignInAccount account = task.getResult(ApiException.class);
                if (account != null) firebaseAuthWithGoogle(account);
            } catch (ApiException e) {
                Log.w("TAG", "Google sign in failed", e);
            }
        }
    }

    private void updateUI(FirebaseUser user) {
        if (user != null) {
            String name = user.getDisplayName();
            String email = user.getEmail();
            String photo = String.valueOf(user.getPhotoUrl());

            text.append("Info : \n");
            text.append(name + "\n");
            text.append(email);
            Picasso.with(LoginActivity.this).load(photo).into(image);
            btn_logout.setVisibility(View.VISIBLE);
            btn_login.setVisibility(View.INVISIBLE);
        } else {
            text.setText("Firebase Login \n");
            Picasso.with(LoginActivity.this).load(R.drawable.ic_firebase_logo).into(image);
            btn_logout.setVisibility(View.INVISIBLE);
            btn_login.setVisibility(View.VISIBLE);
        }
    }

    private void Logout() {
        FirebaseAuth.getInstance().signOut();
        mGoogleSignInClient.signOut().addOnCompleteListener(this,
                task -> updateUI(null));
    }
}

round_bg.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item
    android:state_pressed="true">
    <shape android:shape="rectangle">
        <solid android:color="#ffcc00" />
        <corners android:radius="50dp" />
    </shape>
</item>
<item>
    <shape xmlns:android="http://schemas.android.com/apk/res/android"
        android:shape="rectangle"
        android:padding="10dp">
        <solid android:color="#fff"/>
        <corners
            android:bottomRightRadius="50dp"
            android:bottomLeftRadius="50dp"
            android:topLeftRadius="50dp"
            android:topRightRadius="50dp"/>
    </shape>
</item>
</selector>

This absolutely give the error..
Can't login with this method.. Maybe you can update and send the fixed code..

me funciono perfectamente y lo pude integrar con mi app de tesis gracias

it is so helpfull

Muchísimas gracias por la lección y el código!