What is an App state?

In the context of mobile and web applications, the term “App state” refers to the data or information that defines the current state of the entire application at a given moment. It represents the collection of data and variables that determine how the user interface looks, behaves, and responds to user interactions.

App state can be categorized into two main types:

  1. Local App State: Local app state refers to the data that is specific to a particular widget or component within the application. It is confined to that specific widget’s scope and is not shared with other parts of the app.

For example, if you have a counter widget that increments when a button is pressed, the count value is a part of the local app state for that widget. The value of the count is unique to that specific widget and is not shared with other widgets.

  1. Global App State: Global app state, on the other hand, refers to the data that is shared and accessible across multiple widgets or components within the application. It represents the overall state of the application that affects various parts of the user interface.

Global app state is often managed by a state management solution or pattern, such as Provider, Redux, Bloc, or GetX. These state management solutions help manage the state of the entire application and enable communication and synchronization between different widgets.

For example, if you have a user authentication status that affects various parts of the app (e.g., showing different screens based on whether the user is logged in or not), this authentication status is a part of the global app state.

It’s essential to manage app state effectively to ensure that the UI remains consistent and responsive throughout the application’s lifecycle. Properly managing app state allows you to update the user interface whenever the data changes, making your application interactive and dynamic. State management libraries in Flutter help to efficiently handle app state and keep the UI in sync with the underlying data changes.

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