iPhone(iOS) programming: Get Google Contacts

Dipin Krishna

11 years ago

This tutorial walks you through on how to retrieve google contacts programatically using Objective C.

Here,

1. I am going to create a Single View project for the tutorial.
2. Add the GData headers and other required frameworks and libraries.
3. A screen to get the Username and Password.
4. Retrieve Contacts.

1. Create a new Single View project (For beginners).

This is a tutorial, so i am creating a new project to demonstrate what we are trying to achieve.

Next: Add the Gdata headers and other required frameworks and libraries

2. Add the Gdata headers and other required frameworks and libraries.

Download the GData headers and library from here.

i. Add files : Headers and libGDataTouchStaticLib.a

ii. Goto TARGETS -> Summary
Linked Frameworks : Add libxml2.2 and libxml2

iii. Goto TARGETS -> Build Settings
Linking -> Other Linker Flags : “-lxml2 -all_load”
Search Paths -> Header Search Paths : “/usr/include/libxml2”

Next: A screen to get the Username and Password

3. A screen to get the Username and Password.

We need a screen to ask for Username and Password. Lets Create one.
1. Select the xib file(ViewController.xib) from the navigation tree.
2. Drag and drop labels, text fields and a round rect button to create the login screen. See the video:

Next: Retrieve Contacts

4. Retrieve Contacts.

Lets add code to retrieve the contacts.

ViewController.h

//
//  ViewController.h
//  GoogleContacts
//
//  Created by Dipin Krishna on 20/02/13.
//  Copyright (c) 2013 Dipin Krishna. All rights reserved.
//
 
#import <UIKit/UIKit.h>
#import "GDataFeedContact.h"
#import "GDataContacts.h"
 
@interface ViewController : UIViewController {
    NSMutableArray *googleContacts;
 
    GDataServiceTicket *mContactFetchTicket;
    NSError *mContactFetchError;
}
@property (weak, nonatomic) IBOutlet UITextField *usernameTxt;
@property (weak, nonatomic) IBOutlet UITextField *passwordTxt;
 
- (IBAction)getContacts:(id)sender;
@end

ViewController.m

//
//  ViewController.m
//  GoogleContacts
//
//  Created by Dipin Krishna on 20/02/13.
//  Copyright (c) 2013 Dipin Krishna. All rights reserved.
//
 
#import "ViewController.h"
 
@interface ViewController ()
 
@end
 
@implementation ViewController
 
- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically from a nib.
    googleContacts = [[NSMutableArray alloc] init];
}
 
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
 
- (IBAction)getContacts:(id)sender {
    if ([[self.usernameTxt text] isEqual:@""] || [[self.passwordTxt text] isEqual:@""]) {
        NSLog(@"Username and Password is Required.");
        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Error!"
                                                            message:@"Username and Password is Required."
                                                           delegate:self
                                                  cancelButtonTitle:@"Ok"
                                                  otherButtonTitles:nil, nil];
        [alertView show];
    } else {
        NSLog(@"Get Google Contacts");
        [self getGoogleContacts];
    }
}
 
-(void)getGoogleContacts
{
    GDataServiceGoogleContact *service = [self contactService];
    GDataServiceTicket *ticket;
 
    BOOL shouldShowDeleted = TRUE;
 
    // request a whole buncha contacts; our service object is set to
    // follow next links as well in case there are more than 2000
    const int kBuncha = 2000;
 
    NSURL *feedURL = [GDataServiceGoogleContact contactFeedURLForUserID:kGDataServiceDefaultUser];
 
    GDataQueryContact *query = [GDataQueryContact contactQueryWithFeedURL:feedURL];
    [query setShouldShowDeleted:shouldShowDeleted];
    [query setMaxResults:kBuncha];
 
    ticket = [service fetchFeedWithQuery:query
                                delegate:self
                       didFinishSelector:@selector(contactsFetchTicket:finishedWithFeed:error:)];
 
    [self setContactFetchTicket:ticket];
}
 
- (void)setContactFetchTicket:(GDataServiceTicket *)ticket
{
    mContactFetchTicket = ticket;
}
 
- (GDataServiceGoogleContact *)contactService
{
    static GDataServiceGoogleContact* service = nil;
 
    if (!service) {
        service = [[GDataServiceGoogleContact alloc] init];
 
        [service setShouldCacheResponseData:YES];
        [service setServiceShouldFollowNextLinks:YES];
    }
 
    // update the username/password each time the service is requested
    NSString *username = [self.usernameTxt text];
    NSString *password = [self.passwordTxt text];
 
    [service setUserCredentialsWithUsername:username
                                   password:password];
 
    return service;
}
 
// contacts fetched callback
- (void)contactsFetchTicket:(GDataServiceTicket *)ticket
           finishedWithFeed:(GDataFeedContact *)feed
                      error:(NSError *)error {
 
    if (error) {
        NSDictionary *userInfo = [error userInfo];
        NSLog(@"Contacts Fetch error :%@", [userInfo objectForKey:@"Error"]);
        if ([[userInfo objectForKey:@"Error"] isEqual:@"BadAuthentication"]) {
 
            UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Error!"
                                                                message:@"Authentication Failed"
                                                               delegate:self
                                                      cancelButtonTitle:@"Ok"
                                                      otherButtonTitles:nil, nil];
            [alertView show];
        } else {
            UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Error!"
                                                                message:@"Failed to get Contacts."
                                                               delegate:self
                                                      cancelButtonTitle:@"Ok"
                                                      otherButtonTitles:nil, nil];
            [alertView show];
        }
    } else {
 
        NSArray *contacts = [feed entries];
        NSLog(@"Contacts Count: %d ", [contacts count]);
        [googleContacts removeAllObjects];
        for (int i = 0; i < [contacts count]; i++) {
            GDataEntryContact *contact = [contacts objectAtIndex:i];
 
	    // Name
            NSString *ContactName = [[[contact name] fullName] contentStringValue];
            NSLog(@"Name    :  %@", ContactName);
 
            // Email
            GDataEmail *email = [[contact emailAddresses] objectAtIndex:0];
            NSString *ContactEmail =  @"";
            if (email && [email address]) {
                ContactEmail = [email address];
                NSLog(@"EmailID :  %@", ContactEmail);
            }
 
            // Phone
            GDataPhoneNumber *phone = [[contact phoneNumbers] objectAtIndex:0];
            NSString *ContactPhone = @"";
            if (phone && [phone contentStringValue]) {
                ContactPhone = [phone contentStringValue];
                NSLog(@"Phone   :  %@", ContactPhone);
            }
 
            // Address
            GDataStructuredPostalAddress *postalAddress = [[contact structuredPostalAddresses] objectAtIndex:0];
            NSString *address = @"";
            if (postalAddress && [postalAddress formattedAddress]) {
                NSLog(@"Formatted Address   :  %@", [postalAddress formattedAddress]);
                address = [postalAddress formattedAddress];
            }
 
            // Birthday
            NSString *dob = @"";
            if ([contact birthday]) {
		dob = [contact birthday];
                NSLog(@"dob   :  %@", dob);
            }
 
	    // Notes
            GDataEntryContent *content = [contact content];
            NSString *notes = @"";
            if (content && [content contentStringValue]) {
                notes = [content contentStringValue];
                NSLog(@"Notes   :  %@", notes);
            }
 
            if (!ContactName || !(ContactEmail || ContactPhone) ) {
                NSLog(@"Empty Contact Fields. Not Adding.");
            }
            else
            {
                NSArray *keys = [[NSArray alloc] initWithObjects:@"name", @"emailId", @"phoneNumber", @"address", @"dob", @"notes", nil];
                NSArray *objs = [[NSArray alloc] initWithObjects:ContactName, ContactEmail, ContactPhone, address, dob, notes, nil];
                NSDictionary *dict = [[NSDictionary alloc] initWithObjects:objs forKeys:keys];
 
                [googleContacts addObject:dict];
            }
        }
        NSSortDescriptor *descriptor =
        [[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES selector:@selector(localizedCaseInsensitiveCompare:)];
        [googleContacts sortUsingDescriptors:[NSArray arrayWithObjects:descriptor, nil]];
 
        // YOU HAVE YOUR GOOGLE CONTACTS IN 'googleContacts'. Do whatever you want to do with it.
 
        NSString *message = [[NSString alloc] initWithFormat:@"Fetched %d contacts.", [googleContacts count]];
        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Success!"
                                                            message:message
                                                           delegate:self
                                                  cancelButtonTitle:@"Ok"
                                                  otherButtonTitles:nil, nil];
        [alertView show];
    }
 
}
 
@end

Download the full source code using the below link:

Link: Download Source – Get Google Contacts

Hope it helps………..