What is material button?

Extended floating action buttons are used for a special type of promoted action . A convenience class for creating a new Material button. This class supplies updated Material styles for the button in the constructor. The widget will display the correct default Material styles without the use of the style flag.

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What is a widget in Flutter?

Widgets are the central class hierarchy in the Flutter framework. A widget is an immutable description of part of a user interface . Widgets can be inflated into elements, which manage the underlying render tree. Widgets themselves have no mutable state (all their fields must be final).

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