Widgets

Question 1

What is a Flutter widget?

Answer 1

A Flutter widget is a description of part of a user interface.

Question 2

What is the root widget in a Flutter app?

Answer 2

The root widget is the top-level widget that initializes the app.

Question 3

What is the purpose of the StatelessWidget class in Flutter?

Answer 3

The StatelessWidget class is used for widgets that do not require mutable state.

Question 4

What is the purpose of the StatefulWidget class in Flutter?

Answer 4

The StatefulWidget class is used for widgets that require mutable state.

Question 5

What is the difference between StatelessWidget and StatefulWidget in Flutter?

Answer 5

StatelessWidget is immutable, while StatefulWidget can change state during the lifetime of the widget.

Question 6

What is the build() method in Flutter widgets used for?

Answer 6

The build() method is used to describe the part of the user interface represented by the widget.

Question 7

What is the key property used for in Flutter widgets?

Answer 7

The key property is used to uniquely identify a widget.

Question 8

What is the purpose of the setState() method in Flutter?

Answer 8

The setState() method is used to notify the framework that the internal state of a widget has changed.

Question 9

What is the difference between stateful and stateless widgets in Flutter?

Answer 9

Stateful widgets can change state during the lifetime of the widget, while stateless widgets are immutable.

Question 10

What is a StatefulWidget’s createState() method used for?

Answer 10

The createState() method is used to create the mutable state for a StatefulWidget.

Question 11

What is the purpose of a layout widget in Flutter?

Answer 11

Layout widgets are used to define the visual structure of a user interface.

Question 12

What is the purpose of a material widget in Flutter?

Answer 12

Material widgets implement the Material Design guidelines for visual elements.

Question 13

What is the purpose of a Cupertino widget in Flutter?

Answer 13

Cupertino widgets implement the iOS design guidelines for visual elements.

Question 14

What is the purpose of an InheritedWidget in Flutter?

Answer 14

InheritedWidgets propagate information down the widget tree.

Question 15

What is the difference between StatelessWidget and InheritedWidget in Flutter?

Answer 15

StatelessWidget is a single immutable widget, while InheritedWidget can propagate information down the widget tree.

Question 16

What is the purpose of a GestureDetector widget in Flutter?

Answer 16

GestureDetector widgets recognize gestures made by the user.

Question 17

What is the purpose of a Scaffold widget in Flutter?

Answer 17

The Scaffold widget provides a visual structure for a material design app.

Question 18

What is the purpose of a ListView widget in Flutter?

Answer 18

ListView widgets display a scrolling list of children.

Question 19

What is the main function of a MaterialApp widget in Flutter?

Answer 19

The MaterialApp widget is the root widget for a Flutter application.

Question 20

What is the purpose of a Container widget in Flutter?

Answer 20

Container widgets are used to create visual elements with customizable properties.

Question 21

What is the purpose of an Expanded widget in Flutter?

Answer 21

Expanded widgets expand to fill the available space in a Row, Column, or Flex.

Question 22

What is the purpose of a Positioned widget in Flutter?

Answer 22

Positioned widgets place a child widget at a specific position within a Stack.

Question 23

What is the purpose of a Row widget in Flutter?

Answer 23

Row widgets display their children in a horizontal arrangement.

Question 24

What is the purpose of a Column widget in Flutter?

Answer 24

Column widgets display their children in a vertical arrangement.

Question 25

What is the purpose of a Stack widget in Flutter?

Answer 25

Stack widgets allow children to be stacked on top of each other.