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Version: 3.x.x

Make a Login request

Just import the plugin.

import 'package:flutter_facebook_auth/flutter_facebook_auth.dart';

Now you can use FacebookAuth.instance to call all the methods of the plugin. The login method is asynchronous.

final LoginResult result = await FacebookAuth.instance.login(); // by default we request the email and the public profile
// or FacebookAuth.i.login()
if (result.status == LoginStatus.success) {
    // you are logged
    final AccessToken accessToken = result.accessToken!;
} else {
    print(result.status);
    print(result.message);
}

The LoginResult class has a field called status to check if the login was successful. If your are logged you can get one instance of AccessToken class and get a token(String) to make requests to the Graph API.

By default the login method makes a request with with the permissions to access email and public_profile.

The public_profile permission allows you read the next fields id, first_name, last_name, middle_name, name, name_format, picture, short_name

For more info go to https://developers.facebook.com/docs/facebook-login/permissions/

If you would like to access other information of the user, you need to use the permissions param and pass it a list with the permissions.

Example:

final LoginResult result = await FacebookAuth.instance.login(
    permissions: ['public_profile', 'email', 'pages_show_list', 'pages_messaging', 'pages_manage_metadata'],
);
// or 
// FacebookAuth.i.login(
//   permissions: ['public_profile', 'email', 'pages_show_list', 'pages_messaging', 'pages_manage_metadata'],
// )

The AccessToken class has two fields (only Android and iOS, on web these fields will be null) grantedPermissions and declinedPermissions to check the permissions granted for the user.

On web use FacebookAuth.instance.permissions to check the permissions granted for the user.

FacebookPermissions  permissions = await FacebookAuth.instance.permissions;
// or FacebookAuth.i.permissions

Check if the user is logged.​

Just call to FacebookAuth.instance.accessToken

final AccessToken accessToken = await FacebookAuth.instance.accessToken;
// or FacebookAuth.i.accessToken
if (accessToken != null) {
    // user is logged
}

Log Out​

Just call to FacebookAuth.instance.logOut()

await FacebookAuth.instance.logOut();
// or FacebookAuth.i.logOut();