Intergrate google sign in android using firebase authentication

Posted By : Keshav Gupta | 22-Oct-2017

android

Configuration on server side:

1. Create a project on firebase console.Click on this link

https://console.firebase.google.com/u/1/

2. Add project name and tap on CREATE PROJECT

3. In next screen add firebase to your application by selecting option "Add Firebase to your Android app"

4. Next a popup screen will appear and enter package name and shai key for project.

5. Download google-services.json file and copy in project.

6.Do following changes in your project gradle file

Project-level build.gradle (<project>/build.gradle):

buildscript {
  dependencies {
    // Add this line
    classpath 'com.google.gms:google-services:3.1.0'
  }
}
App-level build.gradle (<project>/<app-module>/build.gradle):

...
// Add to the bottom of the file
apply plugin: 'com.google.gms.google-services'

7. Now you have successfully added firebase to your project.

8. Now open authentication section in project side bar and select sign in tab and enable google tab.

*Now all server side configuration has been done successfully.

Integration in project code :

1.Add following line of code in app/build.gradle/dependencies.

    compile 'com.google.firebase:firebase-auth:9.4.0'
    compile 'com.google.android.gms:play-services-auth:9.4.0'

2.Create a helper class named as GoogleLoginController and add following in class file.

    private static final String TAG = "GoogleActivity";
    private Context context;
    private  GoogleSignInOptions gso;
    public  static final int RC_SIGN_IN = 9001;
    private GoogleApiClient mGoogleApiClient;

3. Instantiate the class and assign gso and mGoogleApiClient.Code will be like this:

public GoogleLoginController(Context context)
 {
     this.context=context;
 }
public void initializeApiClient()
  {
       gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
               .requestIdToken(context.getResources().getString(R.string.gplusapplicationid))
               .requestEmail()
               .build();

             // use this when signin button activity extends FragmentActivity and use enable auto manage

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

              // else use this

        mGoogleApiClient=new GoogleApiClient.Builder(context).
                addApi(Auth.GOOGLE_SIGN_IN_API, gso)
                .addConnectionCallbacks(this)
               .addOnConnectionFailedListener(this)
               .build();
  }

3. Create methods for sign in and sign out and connection callback.Code will be like this:

public void makeGoogleLoggeedIn()
 {
     Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient);
     ((AppCompatActivity)context).startActivityForResult(signInIntent, RC_SIGN_IN);
 }

@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
    Logger.LogDebug(TAG, "onConnectionFailed:" + connectionResult);
    Toast.makeText(context, "Google Play Services error.", Toast.LENGTH_SHORT).show();
}
// [START signOut]
public void signOut() {
    if (mGoogleApiClient != null && mGoogleApiClient.isConnected()) {
        mGoogleApiClient.stopAutoManage((AppCompatActivity)context);
        mGoogleApiClient.disconnect();
    }
   }

@Override
public void onConnected(@Nullable Bundle bundle) {
    Toast.makeText(context, "Gplus connected", Toast.LENGTH_SHORT).show();
}

@Override
public void onConnectionSuspended(int i) {
    Toast.makeText(context, "Gplus connection suspended", Toast.LENGTH_SHORT).show();

4.Final code for helper class will be like this.

public class GoogleLoginController implements GoogleApiClient.OnConnectionFailedListener, GoogleApiClient.ConnectionCallbacks {
    private static final String TAG = "GoogleActivity";
    private Context context;
    private  GoogleSignInOptions gso;
    public  static final int RC_SIGN_IN = 9001;
    private GoogleApiClient mGoogleApiClient;
     public GoogleLoginController(Context context)
     {
         this.context=context;
     }
    public void initializeApiClient()
      {
           gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                   .requestIdToken(context.getResources().getString(R.string.gplusapplicationid))
                   .requestEmail()
                   .build();

                 // use this when signin button activity extends FragmentActivity and use enable auto manage

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

                  // else use this

            mGoogleApiClient=new GoogleApiClient.Builder(context).
                    addApi(Auth.GOOGLE_SIGN_IN_API, gso)
                    .addConnectionCallbacks(this)
                   .addOnConnectionFailedListener(this)
                   .build();
      }
     public void makeGoogleLoggeedIn()
     {
         Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient);
         ((AppCompatActivity)context).startActivityForResult(signInIntent, RC_SIGN_IN);
     }

    @Override
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
        Logger.LogDebug(TAG, "onConnectionFailed:" + connectionResult);
        Toast.makeText(context, "Google Play Services error.", Toast.LENGTH_SHORT).show();
    }
    // [START signOut]
    public void signOut() {
        if (mGoogleApiClient != null && mGoogleApiClient.isConnected()) {
            mGoogleApiClient.stopAutoManage((AppCompatActivity)context);
            mGoogleApiClient.disconnect();
        }
    }

    @Override
    public void onConnected(@Nullable Bundle bundle) {
        Toast.makeText(context, "Gplus connected", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onConnectionSuspended(int i) {
        Toast.makeText(context, "Gplus connection suspended", Toast.LENGTH_SHORT).show();
    }
}

5.Now to use this class in LoginActivity class

On click of custom button of ui.Make these calls stated below.

 googleLoginController = new GoogleLoginController(activity);
                googleLoginController.signOut();
                googleLoginController.initializeApiClient();
                signInButton.performClick();
                googleLoginController.makeGoogleLoggeedIn();

6. Add connection callback and request for profile data in activity class

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

        // add line for gplus signin callback
    if (requestCode == GoogleLoginController.RC_SIGN_IN) {
        GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
        handleSignInResult(result);
    }
}

private void handleSignInResult(GoogleSignInResult result) {
    Log.d("GOOGLE", "handleSignInResult:" + result.isSuccess());
    if (result.isSuccess()) {
        // Signed in successfully, show authenticated UI.
        GoogleSignInAccount acct = result.getSignInAccount();
        Logger.LogError("RESULT", acct.getEmail());
        Logger.LogError("RESULT", acct.getIdToken());
        Logger.LogError("RESULT", acct.getId());
        Logger.LogError("RESULT", acct.getGivenName());
        Logger.LogError("RESULT", acct.getFamilyName());
        Logger.LogError("RESULT", acct.getDisplayName());
        Logger.LogError("RESULT", acct.getPhotoUrl().getPath());
    } else {
        Toast.makeText(activity,R.string.gplusloginfailed, Toast.LENGTH_LONG).show();
    }
}

This was all to do for integrating google sign in.