Android Firebase Google Sign In Authentication Example Tutorial

March 13, 2018 0 Comments



Firebase Google Sign In authentication is very easy to implement in android application. By follow a few simple steps we can easily add Google Login in our app. So here is the complete step by step tutorial for Android Firebase Google Sign In Integration Example Tutorial. This is a very simple tutorial and if you follow all the steps i am going to mention then you can implement Google Login in your app using Firebase.

Contents in this project Android Firebase Google Sign In Authentication.



  1. Start a fresh Android Studio project.

  2. Create, configure and connect Firebase project to your Android Studio Application.

  3. Integrate Internet Permission.

  4. Start Coding.


1. Start a fresh Android Studio project.


2. Create, configure and connect Firebase project to your Android Studio Application :-


1. Open firebase.google.com .

2. Click on Get Started button present on home screen.

Connect Firebase Project

3. Now log in with your Google Gmail ID.

4. Click on Add Project.



5. Enter your project name and select your country then click on CREATE PROJECT .



6. Click on Add firebase to your android app icon.



7. Create a fresh project in Android Studio.

8. Now Add application Package Name, App Nick Name, SHA-1 certificateTo get the SHA-1 certificate from Android Studio read my this tutorial, it is the easiest method to get SHA-1 certificate.



9. Now hit the Register App button.

10. Here you go now your google-services.json file has been successfully generated. Hit the Download google-services.json button to download this file physically into your computer.



11. Next step is to add google-services.json inside your project. So open your project and put( Copy ) google-services.json file inside YourProjectName/app folder. For example my firebase project name is Firebase-AndroidJSon.com then my app folder located is Firebase-AndroidJSon.com/app . Now copy the google-services.json file into app folder like i did in below screenshot.



12. Now open your Project’s build.gradle(Project) file.



13. Add classpath ‘com.google.gms:google-services:3.0.0’ inside dependencies block.



14. Open your project’s build.gradle(Module:app) file.



15. Add compile ‘com.google.firebase:firebase-core:9.8.0’ ,
compile ‘com.google.firebase:firebase-auth:9.8.0’ and
compile ‘com.google.android.gms:play-services-auth:9.8.0’ inside dependencies block .

16. Then add apply plugin: ‘com.google.gms.google-services’ at the bottom of the page.

17. Now finally add below packagingOptions just bottom of buildTypes block like i did.
packagingOptions{
exclude 'META-INF/LICENSE'
exclude 'META-INF/LICENSE-FIREBASE.txt'
exclude 'META-INF/NOTICE'

}

Final Screenshot :

firebase_auth_login

18. Now next step is to Enable Firebase Google Login from Firebase Panel in Authentication section. So click on Authentication -> SIGN-IN-METHOD . Select Google .

sign_in_method

19. Enable Google Sign in From Panel and hit the SAVE button.

google_enable

3. Add internet permission to your project :

Open your project’s AndroidManifest.xml file and copy the below permission inside it. You will find the full AndroidManifest.xml file code at the bottom of this page along with all source code.
<uses-permission android:name="android.permission.INTERNET" />

4. Start Coding :


Code for MainActivity.java file.
package com.androidjson.firebasegooglelogin_androidjsoncom;

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

// Importing Google GMS Auth API Libraries.
import com.google.android.gms.auth.api.Auth;
import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
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.GoogleApiClient;
import com.google.android.gms.common.api.ResultCallback;
import com.google.android.gms.common.api.Status;
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;

public class MainActivity extends AppCompatActivity {

// TAG is for show some tag logs in LOG screen.
public static final String TAG = "MainActivity";

// Request sing in code. Could be anything as you required.
public static final int RequestSignInCode = 7;

// Firebase Auth Object.
public FirebaseAuth firebaseAuth;

// Google API Client object.
public GoogleApiClient googleApiClient;

// Sing out button.
Button SignOutButton;

// Google Sign In button .
com.google.android.gms.common.SignInButton signInButton;

// TextView to Show Login User Email and Name.
TextView LoginUserName, LoginUserEmail;


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


signInButton = (SignInButton) findViewById(R.id.sign_in_button);

SignOutButton= (Button) findViewById(R.id.sign_out);

LoginUserName = (TextView) findViewById(R.id.textViewName);

LoginUserEmail = (TextView) findViewById(R.id.textViewEmail);

signInButton = (com.google.android.gms.common.SignInButton)findViewById(R.id.sign_in_button);

// Getting Firebase Auth Instance into firebaseAuth object.
firebaseAuth = FirebaseAuth.getInstance();

// Hiding the TextView on activity start up time.
LoginUserEmail.setVisibility(View.GONE);
LoginUserName.setVisibility(View.GONE);

// Creating and Configuring Google Sign In object.
GoogleSignInOptions googleSignInOptions = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestIdToken(getString(R.string.default_web_client_id))
.requestEmail()
.build();

// Creating and Configuring Google Api Client.
googleApiClient = new GoogleApiClient.Builder(MainActivity.this)
.enableAutoManage(MainActivity.this , new GoogleApiClient.OnConnectionFailedListener() {
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {

}
} /* OnConnectionFailedListener */)
.addApi(Auth.GOOGLE_SIGN_IN_API, googleSignInOptions)
.build();


// Adding Click listener to User Sign in Google button.
signInButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {

UserSignInMethod();

}
});

// Adding Click Listener to User Sign Out button.
SignOutButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {

UserSignOutFunction();

}
});

}


// Sign In function Starts From Here.
public void UserSignInMethod(){

// Passing Google Api Client into Intent.
Intent AuthIntent = Auth.GoogleSignInApi.getSignInIntent(googleApiClient);

startActivityForResult(AuthIntent, RequestSignInCode);
}

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

super.onActivityResult(requestCode, resultCode, data);

if (requestCode == RequestSignInCode){

GoogleSignInResult googleSignInResult = Auth.GoogleSignInApi.getSignInResultFromIntent(data);

if (googleSignInResult.isSuccess()){

GoogleSignInAccount googleSignInAccount = googleSignInResult.getSignInAccount();

FirebaseUserAuth(googleSignInAccount);
}

}
}

public void FirebaseUserAuth(GoogleSignInAccount googleSignInAccount) {

AuthCredential authCredential = GoogleAuthProvider.getCredential(googleSignInAccount.getIdToken(), null);

Toast.makeText(MainActivity.this,""+ authCredential.getProvider(),Toast.LENGTH_LONG).show();

firebaseAuth.signInWithCredential(authCredential)
.addOnCompleteListener(MainActivity.this, new OnCompleteListener() {
@Override
public void onComplete(@NonNull Task AuthResultTask) {

if (AuthResultTask.isSuccessful()){

// Getting Current Login user details.
FirebaseUser firebaseUser = firebaseAuth.getCurrentUser();

// Showing Log out button.
SignOutButton.setVisibility(View.VISIBLE);

// Hiding Login in button.
signInButton.setVisibility(View.GONE);

// Showing the TextView.
LoginUserEmail.setVisibility(View.VISIBLE);
LoginUserName.setVisibility(View.VISIBLE);

// Setting up name into TextView.
LoginUserName.setText("NAME = "+ firebaseUser.getDisplayName().toString());

// Setting up Email into TextView.
LoginUserEmail.setText("Email = "+ firebaseUser.getEmail().toString());

}else {
Toast.makeText(MainActivity.this,"Something Went Wrong",Toast.LENGTH_LONG).show();
}
}
});
}

public void UserSignOutFunction() {

// Sing Out the User.
firebaseAuth.signOut();

Auth.GoogleSignInApi.signOut(googleApiClient).setResultCallback(
new ResultCallback() {
@Override
public void onResult(@NonNull Status status) {

// Write down your any code here which you want to execute After Sign Out.

// Printing Logout toast message on screen.
Toast.makeText(MainActivity.this, "Logout Successfully", Toast.LENGTH_LONG).show();

}
});

// After logout Hiding sign out button.
SignOutButton.setVisibility(View.GONE);

// After logout setting up email and name to null.
LoginUserName.setText(null);
LoginUserEmail.setText(null);

// After logout setting up login button visibility to visible.
signInButton.setVisibility(View.VISIBLE);
}

}

Code for activity_main.xml layout file.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="20dp"
tools:context="com.androidjson.firebasegooglelogin_androidjsoncom.MainActivity">

<com.google.android.gms.common.SignInButton
android:id="@+id/sign_in_button"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true" />

<Button
android:id="@+id/sign_out"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Click Here To Sign Out"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:visibility="gone"
/>

<TextView
android:id="@+id/textViewName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:text=""
android:gravity="center"
android:textSize="20dp"
android:textColor="#000"
/>

<TextView
android:id="@+id/textViewEmail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_below="@+id/textViewName"
android:text=""
android:gravity="center"
android:textSize="20dp"
android:textColor="#000"
/>

</RelativeLayout>

Code for AndroidManifest.xml file.
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.androidjson.firebasegooglelogin_androidjsoncom">

<uses-permission android:name="android.permission.INTERNET" />

<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

</manifest>

Screenshots:-

Android Firebase Google Sign In Authentication Example Tutorial




Download Demo 

Contributer

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