100 Must-Know Flutter Interview Questions and Answers 2025

Flutter Fundamentals

1.
What is Flutter?
2.
What language does Flutter use for app development?
3.
Can you explain what a widget is in Flutter?
4.
Describe the Flutter architecture.
5.
What is the difference between a StatefulWidget and a StatelessWidget?
6.
How do you create a scrollable list in Flutter?
7.
What is the significance of the BuildContext class?
8.
Explain the Flutter app lifecycle.
9.
How do you debug a Flutter application?
10.
Discuss how layout is structured in Flutter.
11.
What is a pubspec.yaml file and what is its purpose?
12.
How do you handle user input in Flutter?
13.
Explain the purpose of the main.dart file.
14.
How do you apply theming to a Flutter application?
15.
What is the use of the Scaffold widget in Flutter?
16.
How do you add assets and images in a Flutter app?
17.
Explain how you would handle navigation between screens in Flutter.
18.
What is the role of the AppBar widget?
19.
How is animation handled in Flutter?
20.
Can you perform network requests in Flutter? If so, how?

Flutter UI Components

21.
What are some commonly used Flutter widgets for layout?
22.
How do you implement a Drawer in a Flutter application?
23.
What is a SnackBar and how can it be used?
24.
Describe how you would build a form with validation in Flutter.
25.
How do you integrate custom fonts in a Flutter app?
26.
Explain the use of the Stack widget.
27.
What is the purpose of the SafeArea widget?
28.
How do you use the GridView widget?
29.
What is the FloatingActionButton and where is it typically used?

Flutter State Management

30.
What is state management in Flutter, and why is it important?
31.
Can you explain the difference between ephemeral state and app state?
32.
Discuss the Provider package for state management.
33.
What is the BLoC pattern, and how is it implemented in Flutter?
34.
How do you manage global state in a Flutter application?
35.
Explain how the setState method works.
36.
What is the InheritedWidget in Flutter?
37.
Can you discuss other state management solutions like Riverpod or Redux in Flutter?

Flutter Animation and Graphics

38.
How do you create basic animations in Flutter?
39.
Explain the animation controller.
40.
What are tween animations, and how are they used?
41.
Describe how to create a custom painter in Flutter.
42.
How do you make use of the Canvas object?
43.
Discuss ways to optimize animations in Flutter.

Flutter Interactivity and Gestures

44.
How do you detect and respond to gestures in Flutter?
45.
What is the GestureDetector widget, and how is it used?
46.
Explain the difference between a “tap” and an “on pressed” gesture.
47.
How do you create a swipe-to-dismiss feature?

Flutter Navigation and Routing

48.
What is routing in the context of Flutter apps?
49.
How do you pass data between routes/screens in Flutter?
50.
Explain the Navigator class and its main methods.
51.
What is the Route class and its importance?
52.
Can you create named routes in Flutter, and if so, how?
53.
Discuss the concept of deep linking in Flutter applications.

Flutter Data & Backend Integration

54.
How do you integrate REST APIs in a Flutter application?
55.
Explain JSON serialization in Flutter.
56.
How do you manage local storage in Flutter?
57.
Discuss the use of GraphQL in Flutter.
58.
Explain the use of the http package for network calls.

Flutter Testing

59.
What types of tests can you perform in Flutter?
60.
Explain widget testing in Flutter.
61.
What is the role of the testWidgets function?
62.
How do you mock dependencies in Flutter tests?
63.
Describe integration testing and its importance in Flutter apps.

Flutter Packages and Plugins

64.
How do you add and manage third-party packages in a Flutter project?
65.
What is the significance of the pub.dev repository?
66.
Can you explain how to create a Flutter plugin?
67.
Discuss how to use platform channels to connect with native code.

Flutter Performance and Optimization

68.
What techniques are used for performance profiling in Flutter?
69.
How can you reduce the app size in Flutter?
70.
What are the best practices to optimize the rendering performance of a Flutter app?
71.
Explain the use of the RepaintBoundary widget.
72.
How do you monitor and reduce memory usage in Flutter?

Flutter Best Practices

73.
What are some best practices for app design in Flutter?
74.
How should you structure a large-scale Flutter application?
75.
Discuss the importance of code linting and formatting in Flutter.
76.
What are keys in Flutter, and why are they used?

Flutter for Desktop and Web

77.
How do you compile a Flutter web app?
78.
Explain the process of building a desktop app with Flutter.
79.
Are there any limitations of Flutter for web or desktop development?
80.
How do you handle responsive design in Flutter?

Flutter Advanced Concepts

81.
What are Custom Widgets and how do you create them?
82.
Discuss the use of Isolates for concurrency in Flutter.
83.
Describe the concept of Streams in Flutter.
84.
What is the Sliver widget and where would you use it?
85.
Explain how to use Mixins in Flutter development.

Flutter Platform Specifics

86.
How do you style StatusBar in iOS and Android with Flutter?
87.
How do you handle platform-specific UI components?
88.
Can you modify the app’s icon and launch screen in Flutter apps?

Flutter and Continuous Integration/Deployment

89.
How do you integrate a Flutter app with CI/CD pipelines?
90.
What are the common tools used for CI/CD in Flutter development?

Flutter and Version Control

91.
What are the best practices for version control when working on a Flutter app?

Flutter Asynchronous Programming

92.
How do you work with Futures and Promises in Flutter?
93.
Explain the use of the async and await keywords.
94.
How do you handle exceptions in async code in Flutter?

Flutter Release Management

95.
What are the steps to publish a Flutter app on the App Store or Google Play?
96.
How do you manage different release flavors in Flutter?

Flutter Recent Updates and Ecosystem

97.
What were the significant updates from the latest Flutter version?
98.
How does the Flutter ecosystem support the growth and maintenance of packages?
99.
Discuss the role of Dart FFI (Foreign Function Interface) in Flutter apps.

Flutter Community and Resources

100.
What are some trusted sources to keep updated with Flutter development and trends?

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100 Flutter interview questions

What is Flutter?

What language does Flutter use for app development?

Can you explain what a widget is in Flutter?

Describe the Flutter architecture.

What is the difference between a StatefulWidget and a StatelessWidget?

How do you create a scrollable list in Flutter?

What is the significance of the BuildContext class?

Explain the Flutter app lifecycle.

How do you debug a Flutter application?

Discuss how layout is structured in Flutter.

What is a pubspec.yaml file and what is its purpose?

How do you handle user input in Flutter?

Explain the purpose of the main.dart file.

How do you apply theming to a Flutter application?

What is the use of the Scaffold widget in Flutter?

How do you add assets and images in a Flutter app?

Explain how you would handle navigation between screens in Flutter.

What is the role of the AppBar widget?

How is animation handled in Flutter?

Can you perform network requests in Flutter? If so, how?

What are some commonly used Flutter widgets for layout?

How do you implement a Drawer in a Flutter application?

What is a SnackBar and how can it be used?

Describe how you would build a form with validation in Flutter.

How do you integrate custom fonts in a Flutter app?

Explain the use of the Stack widget.

What is the purpose of the SafeArea widget?

How do you use the GridView widget?

What is the FloatingActionButton and where is it typically used?

What is state management in Flutter, and why is it important?

Can you explain the difference between ephemeral state and app state?

Discuss the Provider package for state management.

What is the BLoC pattern, and how is it implemented in Flutter?

How do you manage global state in a Flutter application?

Explain how the setState method works.

What is the InheritedWidget in Flutter?

Can you discuss other state management solutions like Riverpod or Redux in Flutter?

How do you create basic animations in Flutter?

Explain the animation controller.

What are tween animations, and how are they used?

Describe how to create a custom painter in Flutter.

How do you make use of the Canvas object?

Discuss ways to optimize animations in Flutter.

How do you detect and respond to gestures in Flutter?

What is the GestureDetector widget, and how is it used?

Explain the difference between a “tap” and an “on pressed” gesture.

How do you create a swipe-to-dismiss feature?

What is routing in the context of Flutter apps?

How do you pass data between routes/screens in Flutter?

Explain the Navigator class and its main methods.

What is the Route class and its importance?

Can you create named routes in Flutter, and if so, how?

Discuss the concept of deep linking in Flutter applications.

How do you integrate REST APIs in a Flutter application?

Explain JSON serialization in Flutter.

How do you manage local storage in Flutter?

Discuss the use of GraphQL in Flutter.

Explain the use of the http package for network calls.

What types of tests can you perform in Flutter?

Explain widget testing in Flutter.

What is the role of the testWidgets function?

How do you mock dependencies in Flutter tests?

Describe integration testing and its importance in Flutter apps.

How do you add and manage third-party packages in a Flutter project?

What is the significance of the pub.dev repository?

Can you explain how to create a Flutter plugin?

Discuss how to use platform channels to connect with native code.

What techniques are used for performance profiling in Flutter?

How can you reduce the app size in Flutter?

What are the best practices to optimize the rendering performance of a Flutter app?

Explain the use of the RepaintBoundary widget.

How do you monitor and reduce memory usage in Flutter?

What are some best practices for app design in Flutter?

How should you structure a large-scale Flutter application?

Discuss the importance of code linting and formatting in Flutter.

What are keys in Flutter, and why are they used?

How do you compile a Flutter web app?

What is the difference between a `StatefulWidget` and a `StatelessWidget`?

What is the significance of the `BuildContext` class?

What is a `pubspec.yaml` file and what is its purpose?

Explain the purpose of the `main.dart` file.

What is the use of the `Scaffold` widget in Flutter?

What is the role of the `AppBar` widget?

How do you implement a `Drawer` in a Flutter application?

What is a `SnackBar` and how can it be used?

Explain the use of the `Stack` widget.

What is the purpose of the `SafeArea` widget?

How do you use the `GridView` widget?

What is the `FloatingActionButton` and where is it typically used?

Explain how the `setState` method works.

How do you make use of the `Canvas` object?

Explain the `Navigator` class and its main methods.

What is the `Route` class and its importance?

Explain the use of the `http` package for network calls.

What is the role of the `testWidgets` function?

What is the significance of the `pub.dev` repository?

Explain the use of the `RepaintBoundary` widget.

What is the `Sliver` widget and where would you use it?

Explain how to use `Mixins` in Flutter development.