In Flutter, there are two main types of Widgets: Stateless and Stateful. These are two crucial types of Widgets that play a significant role in building the user interface of an app.
Stateless Widgets
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Stateless Widgets are widgets that do not have any state and do not change after being created. When the app's state changes, Stateless Widgets get redrawn with the new values but do not retain any state.
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Stateless Widgets are suitable for basic UI components that do not change. Examples:
Text, Icon, Image, RaisedButton. -
Stateless Widgets are created by inheriting from the StatelessWidget class and implementing the build() method to return the UI representation.
Stateful Widgets
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Stateful Widgets are widgets that have state and can change during runtime. When the state changes, Stateful Widgets automatically get redrawn to reflect the new changes.
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Stateful Widgets are typically used when you need interactive UI components that need to store state and change based on user interactions. Examples:
Form, Checkbox, DropdownButton. -
Stateful Widgets are created by inheriting from the StatefulWidget class and combining with a separate State class to store state and manage UI updates.
Conclusion:
Stateless and Stateful Widgets are essential concepts in Flutter. Stateless Widgets are used for components that have no state and do not change, while Stateful Widgets are used for components that need to store and change state. Using the appropriate type of Widgets for each component allows you to build a flexible and efficient user interface.