Flutter Custom State Management & Dependency Injection | Build Your Own Lightweight GetX Alternative

In this video, I walk you through building a lightweight Flutter state management and dependency injection library — a minimal alternative to GetX.

We implement a simple yet powerful system using ValueNotifier, Rx extensions, and controller lifecycle management, all without relying on heavy external packages.

What’s inside this video:

Building a reactive state system using ValueNotifier and custom Rx extensions

Implementing an onChange method to simplify ValueListenableBuilder usage

Creating a Controller Store for global state tracking

Adding lifecycle hooks: onInit, onReady, and onDispose

Building a simple DI system with lazyPut and find for dependency management

Integrating a Route Observer to handle screen transitions and lifecycle events

Structuring a BaseController class for reusable logic across multiple screens

Comparison with GetX: Similar functionality, smaller footprint

By the end of this video, you’ll learn how to build your own Flutter state management library — lightweight, reactive, and fully under your control.

Perfect for:

Developers who want to understand how GetX works internally

Those looking for a simple, dependency-free alternative

Anyone wanting to learn Flutter reactivity and dependency injection from scratch

Keywords: Flutter state management, Flutter dependency injection, Flutter ValueNotifier, Flutter Rx, Flutter GetX alternative, Flutter custom state management, Flutter DI, GetX explained, Build your own GetX, Flutter base controller, Flutter route observer, Flutter reactive programming