Flutter Contacts: Simplifying Contact Management in Flutter Apps

Managing contacts is a fundamental feature of many mobile apps. Flutter developers often need a reliable way to access and manipulate the contacts list on Android and iOS devices. The Flutter Contacts plugin offers a comprehensive solution for Flutter app developers to interact with the phone contacts on a user's device.

In this blog, we'll dive into the capabilities of this Flutter plugin and how you can leverage it to manage contacts effectively within your Flutter project.

Understanding Flutter Contacts Plugin

The Flutter Contacts plugin is a Dart package designed to help developers create, read, update, delete, and observe native contacts directly from their Flutter app. With group and vCard support, this plugin is versatile enough to handle various contacts-related tasks. Whether you're looking to display a contacts list, enable a contact picker for user selection, or manage contacts in groups, the Flutter Contacts plugin provides the necessary tools.

When you import the Flutter Contacts package into your Flutter project, you can interact seamlessly with the contacts on the device. The plugin takes care of the heavy lifting, allowing you to focus on building a user-friendly interface for your app's contact management.

Copy
import 'package:flutter_contacts/flutter_contacts.dart';

Setting Up Your Flutter Environment

Before diving into the code, setting up your Flutter environment to use the Flutter Contacts plugin is essential. This involves adding the plugin to your pubspec.yaml file and configuring the necessary permissions on both Android and iOS platforms.

For Android, you'll need to ensure that your AndroidManifest.xml includes the uses-permission tags for reading and writing contacts:

Copy
<uses-permission android:name="android.permission.READ_CONTACTS"/>
<uses-permission android:name="android.permission.WRITE_CONTACTS"/>

On the iOS side, your app's Info.plist must contain the NSContactsUsageDescription key to explain why the app requires access to the user's contacts:

Copy
<key>NSContactsUsageDescription</key>
<string>This app requires access to your contacts to manage your contacts list.</string>

With these permissions in place, your Flutter app can request permission from the user to access and manage their contacts. This is a crucial step, as Android and iOS devices enforce strict privacy controls around personal data like contacts.

Integrating Flutter Contacts in Your Flutter App

Integrating the Flutter Contacts plugin into your Flutter app is a multi-step process that involves setting up permissions, fetching the contacts list, adding new contacts, and incorporating a contact picker for user interactions. Let's break down these steps to ensure your app can effectively manage contacts on Android and iOS devices.

Permissions: Granting Access on Android and iOS

The first step in managing contacts within your app is to request the necessary permissions from the user. The Flutter Contacts plugin provides a method to prompt the user for access to their contacts. Handling this process sensitively is essential, as permissions are a cornerstone of user privacy.

To request permission, you can use the following code snippet:

Fetching and Displaying the Contacts List

You can fetch the contacts list once you have the user's permission. The Flutter Contacts plugin allows you to retrieve either a basic list of contacts or a more detailed list that includes additional information like email addresses and profile photos.

To fetch and display the contacts list, consider the following example:

Creating and Saving New Contacts

Your Flutter app can also allow users to create and save new contacts to their devices. The Flutter Contacts plugin simplifies this process by offering a straightforward way to add new contacts to the user's native contacts list.

Here's an example of how to create a new contact:

Utilizing Contact Picker for Enhanced User Interaction

A contact picker can significantly enhance the user experience by providing a simple and intuitive interface for selecting contacts. The Flutter Contacts plugin includes functionality that allows users to pick a contact from their contacts list directly within your app.

Implementing a contact picker can be done as follows:

Advanced Features of Flutter Contacts

The Flutter Contacts plugin isn't just about essential contact management; it also offers advanced features that can take your Flutter app to the next level. These features include the ability to observe changes in native contacts, manage contacts in groups, and utilize vCard functionality for importing and exporting contacts. Let's explore how to implement these advanced features in your Flutter project.

Observing Changes in Native Contacts

Keeping the contacts list in your app synchronized with the native contacts on the user's device is crucial for providing an up-to-date experience. The Flutter Contacts plugin allows you to observe native contacts and receive notifications when changes occur, such as when a new contact is added or an existing one is updated or deleted.

To listen for changes in the contacts database, you can set up a listener like this:

Group Support and VCard Functionality

Group support is valuable for users who categorize their contacts into different segments, such as family, friends, or colleagues. The Flutter Contacts plugin provides functionality to manage contact groups, allowing your app to create, edit, and delete groups.

Additionally, vCard support is a feature that enables your app to export contacts as vCards, which are widely used for sharing contact information. Conversely, your app can also import contacts from vCards, making it easy for users to transfer contacts between different platforms and devices.

Here's how you might export a contact as a vCard:

And to import a contact from a vCard:

Conclusion

The Flutter Contacts plugin is a versatile and essential tool for any Flutter developer looking to implement contact management features. Its support for Android and iOS platforms streamlines the process of creating, fetching, and manipulating contacts while offering advanced capabilities like observing contact changes and handling vCard data. By utilizing this plugin, developers can enhance their apps with robust contacts functionality, providing users with a seamless and integrated experience.

bool permissionGranted = await FlutterContacts.requestPermission();
if (permissionGranted) {
  // You can now access the contacts
} else {
  // Handle the situation where the user denies permission
}

if (permissionGranted) {
  List<Contact> contacts = await FlutterContacts.getContacts(withProperties: true);
  // Now you can use this list to display contacts in your app
}

var newContact = Contact()
  ..name.first = 'John'
  ..name.last = 'Deo'
  ..phones = [Phone('010-1234-5678')];
await FlutterContacts.insertContact(newContact);

Contact? selectedContact = await FlutterContacts.openExternalPick();
if (selectedContact != null) {
  // The user has picked a contact, and you can use it within your app
}

FlutterContacts.addListener(() {
  // Code to handle changes in the contacts list
});

String vCard = await selectedContact.toVCard();
// Now you can share this vCard string or save it as a .vcf file

Contact importedContact = Contact.fromVCard(vCardString);
// The contact is now imported and can be added to the contacts list