How to use shared preferences to keep user logged in flutter?

Shared Preferences is a key-value store that is used to persist data in a Flutter application between app launches. To use Shared Preferences in Flutter, you need to use the shared_preferences package.

Here’s an example of how you could use Shared Preferences to keep a user logged in:

1. Add the shared_preferences package to your pubspec.yaml file:

dependencies:
  shared_preferences: ^0.5.12

2. Import the shared_preferences package in your Dart code:

import 'package:shared_preferences/shared_preferences.dart';

3. To store the user’s login state, you could use the setBool method to set a value of true or false in Shared Preferences:

Future<void> setUserLoggedIn(bool value) async {
  final prefs = await SharedPreferences.getInstance();
  prefs.setBool('loggedIn', value);
}

4. To retrieve the user’s login state, you could use the getBool method to retrieve the value of 'loggedIn' from Shared Preferences:

Future<bool> isUserLoggedIn() async {
  final prefs = await SharedPreferences.getInstance();
  return prefs.getBool('loggedIn') ?? false;
}

5. Finally, you can use these methods in your Flutter app to keep the user logged in. For example, when the user logs in, you can call the setUserLoggedIn method with a value of true, and when the user logs out, you can call it with a value of false. When your app starts, you can call the isUserLoggedIn method to check if the user is logged in, and if so, redirect them to the appropriate page.