Retrieving information about a contact with Google People API (java) android

Google-People-API-Android

 // call this mathod from your onCreate 
 private void GoogleLogin() {
        GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestScopes(new Scope(PeopleScopes.USERINFO_PROFILE))
                .requestIdToken(getString(R.string.default_web_client_id))
                .requestEmail()
                // The serverClientId is an OAuth 2.0 web client ID, u can get this from google api console like any other api key 
                .requestServerAuthCode(getString(R.string.clientID), false)
                .requestProfile()
                .build();
        
        mGoogleSignInClient = GoogleSignIn.getClient(this, gso);
        Intent signInIntent = mGoogleSignInClient.getSignInIntent();
        startActivityForResult(signInIntent, RC_SIGN_IN);

}
//then override this in your activity 
@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) {
            Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);

            try {

                // Google Sign In was successful, authenticate with Firebase
                GoogleSignInAccount account = task.getResult(ApiException.class);
                if (account != null)
                    PeopleApiCall(account.getServerAuthCode());// call people api to get more user info e.g user gender, data of birth 
            } catch (ApiException e) {
                // Google Sign In failed, update UI appropriately
                if (progressDialog != null)
                    progressDialog.dismiss();
                Log.w(TAG, "Google sign in failed", e);
                Toast.makeText(LoginActivity.this, "onGoogle Singin Error" + e.getMessage(), Toast.LENGTH_LONG).show();
            }
        }
}

private void PeopleApiCall(String serverAuthCode) {
        Observable.fromCallable(() -> {
            try {
                People peopleService = PeopleHelper.setUp(LoginActivity.this, serverAuthCode);
                return peopleService.people().get("people/me").setRequestMaskIncludeField("person.photos,person.names,person.genders,person.birthdays").execute();//if you want get more user filds read this link https://stackoverflow.com/a/35623288/5727285

            } catch (Exception e) {
                return null;
            }

        })
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe((person) -> {

                    if (progressDialog != null)
                        progressDialog.dismiss();
                    if (person != null) {
                        if (person.getGenders() != null && person.getGenders().size() > 0) {
                            updateUI(person.getGenders().get(0).getValue());//update user info in firebase auth
                        }

                        if (person.getPhotos() != null && person.getPhotos().size() > 0) {
                            Log.d(TAG, "user cover photo: " + person.getPhotos().get(0).getUrl());
                        }

                        if (person.getBirthdays() != null && person.getBirthdays().size() > 0) {
                            Log.d(TAG, "data of birhts" + person.getBirthdays().get(0).getText());
                            Log.d(TAG, "data of birhts" + person.getBirthdays().get(0).getDate().getYear());
                            Log.d(TAG, "data of birhts" + person.getBirthdays().get(0).toString());
                        }
                        // Log.d(TAG, String.format("googleOnComplete: gender: %s, birthday: %s, about: %s, cover: %s", profileGender, profileBirthday, profileAbout, profileCover));
                    }
                });
}

PeopleHelper ?

People Helper Class

import android.content.Context;

import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeTokenRequest;
import com.google.api.client.googleapis.auth.oauth2.GoogleCredential;
import com.google.api.client.googleapis.auth.oauth2.GoogleTokenResponse;
import com.google.api.client.http.HttpTransport;
import com.google.api.client.http.javanet.NetHttpTransport;
import com.google.api.client.json.jackson2.JacksonFactory;
import com.google.api.services.people.v1.People;

import java.io.IOException;

/**
 * Created by Suleiman19 on 4/4/16.
 */
public class PeopleHelper {

    private static final String APPLICATION_NAME = "Peoples App";


    public static People setUp(Context context, String serverAuthCode) throws IOException {
        HttpTransport httpTransport = new NetHttpTransport();
        JacksonFactory jsonFactory = JacksonFactory.getDefaultInstance();

        // Redirect URL for web based applications.
        // Can be empty too.
        String redirectUrl = "urn:ietf:wg:oauth:2.0:oob";


        // Exchange auth code for access token
        GoogleTokenResponse tokenResponse = new GoogleAuthorizationCodeTokenRequest(
                httpTransport,
                jsonFactory,
                context.getString(R.string.clientID),
                context.getString(R.string.clientSecret),
                serverAuthCode,
                redirectUrl).execute();

        // Then, create a GoogleCredential object using the tokens from GoogleTokenResponse
        GoogleCredential credential = new GoogleCredential.Builder()
                .setClientSecrets(context.getString(R.string.clientID), context.getString(R.string.clientSecret))
                .setTransport(httpTransport)
                .setJsonFactory(jsonFactory)
                .build();

        credential.setFromTokenResponse(tokenResponse);

        // credential can then be used to access Google services
        return new People.Builder(httpTransport, jsonFactory, credential)
                .setApplicationName(APPLICATION_NAME)
                .build();
    }

}