Enable Gmail login in my application

Question

These are the minimum details i need to login to my application:

guid(Global Unique ID)

fname

lname

email

gender

for Facebook login it was clear and could do this:

JSONObject json = Util.parseJson(facebook.request("me");

to get all the data specified above.

Is, there a way i can do something similar and simple with Gmail?

I read this which says:

No, there is no such SDK(like facebook) and if you want to access the emails of Gmail then you need to implement your own email client and for that follow the above link shared by Spk.

But i only want few user details, I don't need anything related to his mails etc.., which come under Authorization (if I am right). I only need Authentication:

I also read this, but doesn't look like it will help any.

This is the code i have now:

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesClient.ConnectionCallbacks;
import com.google.android.gms.common.GooglePlayServicesClient.OnConnectionFailedListener;
import com.google.android.gms.plus.GooglePlusUtil;
import com.google.android.gms.plus.PlusClient;
import android.os.Bundle;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.content.IntentSender.SendIntentException;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity implements ConnectionCallbacks,
        OnConnectionFailedListener {

    private static final int REQUEST_CODE_RESOLVE_ERR = 7;
    private ProgressDialog mConnectionProgressDialog;
    private PlusClient mPlusClient;
    private ConnectionResult mConnectionResult;
    private String TAG = "GmailLogin";

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

        int errorCode = GooglePlusUtil.checkGooglePlusApp(this);
        if (errorCode != GooglePlusUtil.SUCCESS) {
            GooglePlusUtil.getErrorDialog(errorCode, this, 0).show();
        } else {

             mPlusClient = new PlusClient.Builder(this, this, this)
             .setVisibleActivities( "http://schemas.google.com/AddActivity",
             "http://schemas.google.com/BuyActivity").build();


            mConnectionProgressDialog = new ProgressDialog(this);
            mConnectionProgressDialog.setMessage("Signing in...");

            Button signInButton = (Button) findViewById(R.id.sign_in_button);
            signInButton.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {

                    if (mConnectionResult == null) {
                        mConnectionProgressDialog.show();
                    } else {
                        try {
                            mConnectionResult
                                    .startResolutionForResult(
                                            MainActivity.this,
                                            REQUEST_CODE_RESOLVE_ERR);
                        } catch (SendIntentException e) {
                            // Try connecting again.
                            mConnectionResult = null;
                            mPlusClient.connect();
                        }
                    }
                }
            });
        }

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public void onConnectionFailed(ConnectionResult result) {
        if (result.hasResolution()) {
            try {
                result.startResolutionForResult(this, REQUEST_CODE_RESOLVE_ERR);
            } catch (SendIntentException e) {
                mPlusClient.connect();
            }
        }
        // Save the result and resolve the connection failure upon a user click.
        mConnectionResult = result;
    }

    @Override
    protected void onActivityResult(int requestCode, int responseCode,
            Intent intent) {
        if (requestCode == REQUEST_CODE_RESOLVE_ERR
                && responseCode == RESULT_OK) {
            mConnectionResult = null;
            mPlusClient.connect();
        }
    }

    @Override
    public void onConnected() {
        String accountName = mPlusClient.getAccountName();
        Toast.makeText(this, accountName + " is connected.", Toast.LENGTH_LONG)
                .show();
    }

    @Override
    public void onDisconnected() {
        Log.d(TAG, "disconnected");
    }

    @Override
    protected void onStart() {
        super.onStart();
        mPlusClient.connect();
    }

    @Override
    protected void onStop() {
        super.onStop();
        mPlusClient.disconnect();
    }

    }

Any help is greatly appreciated, Thank You.

Answer 1

You should not use Gmail for user authentication using Google accounts. You can use Google + Sign-in for Android instead. This will allow you to access the user's profile information upon getting the required permissions using OAuth. Check out the guide here:

https://developers.google.com/+/mobile/android/sign-in