How to Use Shared Preferences in Flutter for User Login Data

Learn how to store and retrieve user login data using `Shared Preferences` in Flutter. This guide provides a step-by-step solution to manage user ID, email, and passwords effortlessly.
---

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Flutter Shared Preferences

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Managing User Login Data with Flutter's Shared Preferences

When building applications in Flutter, one common requirement is to manage user authentication. After successfully logging in, you may need to store user data—for instance, the user ID, email, and some other essential information. How can you efficiently accomplish this using Flutter's Shared Preferences? This guide will provide a comprehensive guide on how to transfer and manage this data seamlessly.

The Problem: Capturing User Data

Imagine this scenario: a user logs into your application, providing their email and password. Upon successful authentication, you want to capture their user ID and email, but do not want to prompt them for this information multiple times throughout the app. Instead, you wish to save it for future use within your application.

Here’s a breakdown of how to implement this using Flutter’s Shared Preferences.

Step 1: Login Method

Start with the implementation of the login functionality. You’ll make a POST request to your server to verify the user’s credentials.

[[See Video to Reveal this Text or Code Snippet]]

Breakdown of the Login Method

Input Validation: It checks whether the email and password fields are not empty.

API Call: It sends the credentials to the server.

Response Handling: If the response is successful (status code 200), it retrieves user details and navigates to the next page while passing user data.

Step 2: Storing Data using Shared Preferences

Now, let’s see how to store that user data using Shared Preferences after successful login.

Create a Method to Store Data

[[See Video to Reveal this Text or Code Snippet]]

Define a Shared Preferences Class

You will need a class to manage storing and retrieving the user data:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Retrieve User Data in a Different Page

Once the user data is stored, you can easily retrieve it in different parts of the application. For instance, let’s see how to use it in a CarList page.

Using initState to Load User Data

[[See Video to Reveal this Text or Code Snippet]]

Data Class Definition

Finally, don’t forget to create a simple data model class to hold user information:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

In this guide, we explored how to manage user data effectively in a Flutter application using Shared Preferences. By storing vital information like the user ID and email during the login process, you can enhance the user experience and reduce redundant data entry.

Implementing these practices helps in developing a more user-friendly application that caters to the needs of every user.

If you’re new to Flutter and find this information helpful, feel free to reach out with any questions or observations!