Flutter: Local Storage (Shared Preferences) — Auto Login

Welcome to another part of my Flutter tutorials. As I am on a journey in exploring more about Flutter, I will be penning down useful mechanisms that we may use in the daily mobile apps we build.

Today, I will be touching on a popular topic call Local Storage, which will use a shared_preferences package to help us achieve what we want.

In very simple words, local storage helps us to store data that can be reused at a later time even after the app is shut down. One very simple use case is when we want to auto-login a user.

So let’s get started by creating a new project with flutter create auto_login.
Add shared_preferences: ^0.5.1+2 into pubspec.yaml file and run flutter packages get.

You can replace the code in main.dart with this:

1. Firstly we import shared_preferences.
2. In initState we call autoLogin to render the correct UI.
3. We have loginUser and logout to store and delete our username .