Change UI selected item | Riverpod 2.0 | State Notifier Provider
Riverpod 2.0
Riverpod is a reactive caching and data-binding framework that was born as an evolution of the Provider package.
According to the official documentation:
Riverpod is a complete rewrite of the Provider package to make improvements that would be otherwise impossible.
Many people still view it as a "state management" framework.
But it is much more than that.
In fact, Riverpod 2.0 borrows many valuable concepts from React Query and brings them to the Flutter world.
Riverpod is very versatile, and you can use it to:
catch programming errors at compile-time rather than at runtime
easily fetch, cache, and update data from a remote source
perform reactive caching and easily update your UI
depend on asynchronous or computed state
create, use, and combine providers with minimal boilerplate code
dispose the state of a provider when it is no longer used
write testable code and keep your logic outside the widget tree
Riverpod implements well-defined patterns for retrieving and caching data, so you don't have to reimplement them.
And it also helps you establish a good app architecture (if you use it correctly), so you can focus on building features with minimal friction.
Getting started with Riverpod is easy.
But there is a bit of a learning curve if you want to use it to its full capacity, and I've created this guide to cover all the essential concepts and APIs.
How this guide is organized
To make it easier to follow, I've organized this guide into three main parts:
Why use Riverpod, how to install it, and core concepts
An overview of the eight different kinds of providers (and when to use them)
Additional Riverpod features (modifiers, provider overrides, filtering, testing support, logging, etc.)
This guide is extensive and up to date, and you can use it as a reference in addition to the official documentation.
We'll explore the main Riverpod APIs and concepts using simple examples.
Where appropriate, I've included links to separate articles covering more complex, real-world examples that didn't fit here.
StateNotifierProvider
StateNotifierProvider and StateNotifier are ideal for managing state that may change in reaction to an event or user interaction.
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