Integrate Google Sign In in Android Studio



Today I'll teach you how to Integrate Google SignIn in android studio.

  • First for signIn we need Internet Permission. So add Internet permission.

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

  • Then we go to activity_main.xml.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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/main_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#000000"
    android:weightSum="4">


    <ProgressBar
        android:id="@+id/progressBar"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginBottom="8dp"
        android:visibility="gone"
         />


    <LinearLayout
        android:id="@+id/relativeLayout"
        android:layout_width="match_parent"
        android:layout_height="183dp"

        android:background="#E0E0E0"
        android:gravity="center_horizontal|center_vertical"
     >

        <com.google.android.gms.common.SignInButton
            android:id="@+id/sign_in_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:visibility="visible"



            />

    </LinearLayout>

</LinearLayout>
  • Next is the MainActivity.java file.

package com.sanjay.adsensechecker;

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.ProgressBar;

import android.widget.Toast;

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.api.GoogleApiClient;

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 implements
        GoogleApiClient.OnConnectionFailedListener,  View.OnClickListener {

    private static final String TAG = "GoogleActivity";
    private static final int RC_SIGN_IN = 9001;

    private FirebaseAuth mAuth;
    private GoogleApiClient mGoogleApiClient;

    private ProgressBar progressBar;

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

        progressBar = (ProgressBar) findViewById(R.id.progressBar);



        // Button listeners
        findViewById(R.id.sign_in_button).setOnClickListener(this);


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

        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .enableAutoManage(this /* FragmentActivity */, this /* OnConnectionFailedListener */)
                .addApi(Auth.GOOGLE_SIGN_IN_API, gso)
                .build();

        // [START initialize_auth]
        mAuth = FirebaseAuth.getInstance();
    }

    // [START on_start_check_user]
    @Override
    public void onStart() {
        super.onStart();
        // Check if user is signed in (non-null) and update UI accordingly.
        FirebaseUser currentUser = mAuth.getCurrentUser();
        updateUI(currentUser);
    }
    // [END on_start_check_user]

    // [START onactivityresult]
    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        // Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
        if (requestCode == RC_SIGN_IN) {
            GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
            if (result.isSuccess()) {
                // Google Sign In was successful, authenticate with Firebase
                GoogleSignInAccount account = result.getSignInAccount();
                firebaseAuthWithGoogle(account);
            } else {
                // Google Sign In failed, update UI appropriately
                // [START_EXCLUDE]
                updateUI(null);
                // [END_EXCLUDE]
            }
        }
    }
    // [END onactivityresult]

    // [START auth_with_google]
    private void firebaseAuthWithGoogle(GoogleSignInAccount acct) {
        Log.d(TAG, "firebaseAuthWithGoogle:" + acct.getId());
        // [START_EXCLUDE silent]
        progressBar.setVisibility(View.VISIBLE);
        // [END_EXCLUDE]

        AuthCredential credential = GoogleAuthProvider.getCredential(acct.getIdToken(), null);
        mAuth.signInWithCredential(credential)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if (task.isSuccessful()) {
                            // Sign in success, update UI with the signed-in user's information
                            Log.d(TAG, "signInWithCredential:success");
                            FirebaseUser user = mAuth.getCurrentUser();
                            updateUI(user);
                        } else {
                            // If sign in fails, display a message to the user.
                            Log.w(TAG, "signInWithCredential:failure", task.getException());
                            Toast.makeText(MainActivity.this, "Authentication failed.",
                                    Toast.LENGTH_SHORT).show();
                            updateUI(null);
                        }

                        // [START_EXCLUDE]
                        progressBar.setVisibility(View.GONE);
                        // [END_EXCLUDE]
                    }
                });
    }
    // [END auth_with_google]

    // [START signin]
    private void signIn() {
        Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient);
        startActivityForResult(signInIntent, RC_SIGN_IN);
    }
    // [END signin]




    private void updateUI(FirebaseUser user) {
        progressBar.setVisibility(View.GONE);
        if (user != null) {



            Intent intent = new Intent();
            intent.setClass(getApplicationContext(),ViewActivity.class);
            startActivity(intent);
            finish();
        } else {




        }
    }

    @Override
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
        // An unresolvable error has occurred and Google APIs (including Sign-In) will not
        // be available.
        Log.d(TAG, "onConnectionFailed:" + connectionResult);
        Toast.makeText(this, "Google Play Services error.", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onClick(View v) {
        int i = v.getId();
        if (i == R.id.sign_in_button) {
            signIn();
        }
    }


}

  • Then create new activity name as ViewActivity.java file
package com.sanjay.adsensechecker;

import android.content.DialogInterface;
import android.content.Intent;
import android.support.annotation.NonNull;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.common.api.ResultCallback;
import com.google.android.gms.common.api.Status;

import com.google.android.gms.auth.api.Auth;
import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;


public class ViewActivity extends AppCompatActivity implements GoogleApiClient.OnConnectionFailedListener {

    private FirebaseAuth mAuth;
   
    private GoogleApiClient mGoogleApiClient;
    private static final String TAG = "GoogleActivity";
   
    private String email = "";
    private String Uid ="";
    private String name = "";
 


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_view);
        mAuth = FirebaseAuth.getInstance();
       


       

        GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestIdToken(getString(R.string.default_web_client_id))
                .requestEmail()
                .build();
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .enableAutoManage(this /* FragmentActivity */, this /* OnConnectionFailedListener */)
                .addApi(Auth.GOOGLE_SIGN_IN_API, gso)
                .build();

    }

    @Override
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
        // An unresolvable error has occurred and Google APIs (including Sign-In) will not
        // be available.
        Log.d(TAG, "onConnectionFailed:" + connectionResult);
        Toast.makeText(this, "Google Play Services error.", Toast.LENGTH_SHORT).show();
    }
    @Override
    public void onStart() {
        super.onStart();
        // Check if user is signed in (non-null) and update UI accordingly.
        FirebaseUser currentUser = mAuth.getCurrentUser();
        updateUI(currentUser);
    }
    @Override
    public boolean
    onCreateOptionsMenu(Menu menu)
    {
        menu.add(0,0,1,"Sign Out");
        return true;
    }
    @Override
    public boolean
    onOptionsItemSelected(MenuItem item){
        switch (item.getItemId()){
            case 0:
                signout();
                break;
        }
        return
                super.onOptionsItemSelected(item);
    }

    private void signout() {
        FirebaseAuth.getInstance().signOut();

        mAuth.signOut();

        // Google revoke access
        Auth.GoogleSignInApi.revokeAccess(mGoogleApiClient).setResultCallback(
                new ResultCallback<Status>() {
                    @Override
                    public void onResult(@NonNull Status status) {
                        updateUI(null);
                    }
                });
        Intent intent = new Intent();
        intent.setClass(getApplicationContext(),MainActivity.class);
        startActivity(intent);
        finish();


    }


    private void updateUI(FirebaseUser currentUser) {
        if (currentUser != null) {

email = currentUser.getEmail();
Uid = currentUser.getUid();

name=currentUser.getDisplayName();




        } else {





        }
    }


}


  • Next in activity_view.xml.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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=".ViewActivity">

   <TextView 
android:layout_width="wrap_content"
    android:layout_height="wrap_content"
android:id="@+id/email"/>
<TextView 
android:layout_width="wrap_content"
    android:layout_height="wrap_content"
android:id="@+id/Uid"/>
<TextView 
android:layout_width="wrap_content"
    android:layout_height="wrap_content"
android:id="@+id/name"/>
</LinearLayout>


  • Then add firebase library inside android studio.

Thank you
















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