How to add Google Sign-in in Android App in Android Studio

 

In this video, I will tell you how to add Google Sign-in in Android App in Android Studio. The profile information obtained thus can be used to store in a database. The tutorial consists of the following functionalities. 1. Google sign-in 2. Sign-out 3. Checking for the user already signed-in 4. Showing profile info

The link to the source code is below:

Code snippet for dependencies in App level Gradle:: build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.2"
    defaultConfig {
        applicationId "com.allcodingtutorials.googlesignin"
        minSdkVersion 19
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.2.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.3.0'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
    implementation 'com.google.android.gms:play-services-auth:19.0.0'
    implementation 'com.github.bumptech.glide:glide:4.12.0'
    annotationProcessor 'com.github.bumptech.glide:compiler:4.12.0'
}

Code snippet for Manifest:: AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.allcodingtutorials.googlesignin">

    <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=".ProfileActivity"></activity>
        <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>

Codes snippet for activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Click to Sign-in"
        android:layout_centerInParent="true"
        android:textSize="24dp"
        />

    <com.google.android.gms.common.SignInButton
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/signin"
        android:layout_below="@id/text"/>
</RelativeLayout>

Codes snippet for activity_profile.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".ProfileActivity">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:orientation="vertical">
    <ImageView
        android:id="@+id/profileimage"
        android:layout_width="100dp"
        android:layout_height="100dp"/>
        <TextView
        android:id="@+id/name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="30dp"/>
     <TextView
            android:id="@+id/firstname"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="30dp"/>
        <TextView
            android:id="@+id/secondname"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="30dp"/>
        <TextView
            android:id="@+id/email"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="30dp"/>
        <TextView
            android:id="@+id/userID"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="30dp"/>
    <Button
        android:id="@+id/signout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Sign-out"
        android:textSize="24dp"
        android:layout_marginTop="30dp"/>
    </LinearLayout>
</RelativeLayout>

Code snippet for MainActivity.java

package com.allcodingtutorials.googlesignin;

import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ProgressBar;
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.SignInButton;
import com.google.android.gms.common.api.ApiException;
import com.google.android.gms.tasks.Task;
public class MainActivity extends AppCompatActivity {
    SignInButton signInButton;
    GoogleSignInClient mGoogleSignInClient;
    static final int RC_SIGN_IN = 0;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        signInButton = (SignInButton) findViewById(R.id.signin);
        GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestEmail()
                .build();
        mGoogleSignInClient = GoogleSignIn.getClient(this, gso);

        signInButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                switch (view.getId()) {
                    case R.id.signin:
                        signIn();
                        break;
                }}}); }

    private void signIn() {
        Intent signInIntent = mGoogleSignInClient.getSignInIntent();
        startActivityForResult(signInIntent, RC_SIGN_IN);
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == RC_SIGN_IN) {
            Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
            handleSignInResult(task);
        }
    }

    private void handleSignInResult(Task<GoogleSignInAccount> completedTask) {
        try {
            GoogleSignInAccount account = completedTask.getResult(ApiException.class);
            Toast.makeText(this, "Sign-in Successful", Toast.LENGTH_SHORT).show();
            Intent intent = new Intent(this, ProfileActivity.class);
            startActivity(intent);
        } catch (ApiException e) {
            Log.w("Error", "signInResult:failed code=" + e.getStatusCode());
        }
    }
    @Override
    protected void onStart() {
        super.onStart();
        GoogleSignInAccount account = GoogleSignIn.getLastSignedInAccount(this);
        if(account!=null)
        {
            Toast.makeText(this, "User already Signed-in", Toast.LENGTH_SHORT).show();
            Intent intent = new Intent(getApplicationContext(),ProfileActivity.class);
            startActivity(intent);
        }
    }
}

Code snippet for ProfileActivity.java

package com.allcodingtutorials.googlesignin;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import android.Manifest;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.bumptech.glide.Glide;
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.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
public class ProfileActivity extends AppCompatActivity {
    Button signout;
    GoogleSignInClient mGoogleSignInClient;
    TextView userName, userFirstName, userSecondName, userEmail, userId;
    ImageView profileImage;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_profile);
        userName = (TextView) findViewById(R.id.name);
        userFirstName = (TextView) findViewById(R.id.firstname);
        userSecondName = (TextView) findViewById(R.id.secondname);
        userEmail= (TextView) findViewById(R.id.email);
        userId = (TextView) findViewById(R.id.userID);
        profileImage = (ImageView) findViewById(R.id.profileimage);
        signout = (Button) findViewById(R.id.signout);
        GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestEmail()
                .build();
        mGoogleSignInClient = GoogleSignIn.getClient(this, gso);

        GoogleSignInAccount account = GoogleSignIn.getLastSignedInAccount(this);
        if (account != null) {
            String personName = account.getDisplayName();
            String personGivenName = account.getGivenName();
            String personFamilyName = account.getFamilyName();
            String personEmail = account.getEmail();
            String personId = account.getId();
            Uri personPhoto = account.getPhotoUrl();

            userName.setText(personName);
            userFirstName.setText(personGivenName);
            userSecondName.setText(personFamilyName);
            userEmail.setText(personEmail);
            userId.setText(personId);
            Glide.with(this).load(personPhoto).into(profileImage);
        }
        signout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view)
            {
                switch (view.getId())
                {
                    case R.id.signout:
                        signOut();
                        break;
                }   }  });}

    private void signOut() {
        mGoogleSignInClient.signOut()
                .addOnCompleteListener(this, new OnCompleteListener<Void>() {
                    @Override
                    public void onComplete(@NonNull Task<Void> task) {
                        Toast.makeText(ProfileActivity.this, "User Signed Out Successfully", Toast.LENGTH_SHORT).show();
                        Intent intent = new Intent(getApplicationContext(), MainActivity.class);
                        startActivity(intent);
                    } });  }}

That's all...