Mobile Applications Flutter Foundations Chapter 3

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Flutter is a cross-platform UI toolkit developed by Google for building native-looking Android and iOS apps from a single codebase.

Flutter uses widgets to build the user interface. Widgets are the building blocks of Flutter apps, they represent an element of the user interface, for example, a button or a text field.

Stateless widgets are immutable, meaning their state (data) cannot change. They are used for UI elements that are always the same, like a simple text label or an icon.

Stateful widgets are mutable, meaning their state (data) can change. They are used for UI elements that need to update dynamically, like a counter or a list that can be modified.

Flutter uses a widget and element tree to represent the UI. Widgets are the blueprint, and elements are the actual rendered instances of widgets in the UI.

Stateless widgets are immutable components, meaning their appearance and behavior remain constant throughout their lifecycle. They simply display information without any dynamic changes.

Stateful widgets are dynamic and can change their appearance or behavior over time. They manage and respond to user interactions and data updates.

The build method is the core method within a widget that determines how the widget is rendered on the screen. It takes a BuildContext as input and returns a widget tree representing the widget's UI.

The setState method allows you to trigger a rebuild of a stateful widget, forcing it to re-render its UI based on any changes to its state. This is essential for updating the widget's appearance in response to user actions or data modifications.

The widget lifecycle refers to the various phases a widget goes through from creation to disposal. Each phase represents a specific stage in a widget's existence and triggers certain events.

The build method is called when a widget needs to be rebuilt. This typically happens when the widget's state changes, or when a widget's parent widget rebuilds.

A widget tree is a hierarchical representation of all the widgets in a Flutter app. It shows how widgets are nested and interconnected.

An element is the actual rendered instance of a widget on the screen. It's the physical manifestation of the widget's configuration in the UI.

The Element Tree is a tree-like structure that represents all the elements in a Flutter app. It's the actual visual representation of your app, showing how the elements are arranged and connected.

The createElement method creates a new element based on a given widget. This method is responsible for generating the initial instance of a widget in the UI.

The createState method is called when a stateful widget needs to create a new state object. This object manages the state of the widget and controls how it updates.