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Flutter

100 Flutter interview questions

Only coding challenges
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Flutter Fundamentals


  • 1.

    What is Flutter?

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  • 2.

    What language does Flutter use for app development?

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  • 3.

    Can you explain what a widget is in Flutter?

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  • 4.

    Describe the Flutter architecture.

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  • 5.

    What is the difference between a StatefulWidget and a StatelessWidget?

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  • 6.

    How do you create a scrollable list in Flutter?

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  • 7.

    What is the significance of the BuildContext class?

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  • 8.

    Explain the Flutter app lifecycle.

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  • 9.

    How do you debug a Flutter application?

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  • 10.

    Discuss how layout is structured in Flutter.

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  • 11.

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

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  • 12.

    How do you handle user input in Flutter?

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  • 13.

    Explain the purpose of the main.dart file.

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  • 14.

    How do you apply theming to a Flutter application?

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  • 15.

    What is the use of the Scaffold widget in Flutter?

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  • 16.

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

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  • 17.

    Explain how you would handle navigation between screens in Flutter.

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  • 18.

    What is the role of the AppBar widget?

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  • 19.

    How is animation handled in Flutter?

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  • 20.

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

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Flutter UI Components


  • 21.

    What are some commonly used Flutter widgets for layout?

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  • 22.

    How do you implement a Drawer in a Flutter application?

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  • 23.

    What is a SnackBar and how can it be used?

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  • 24.

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

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  • 25.

    How do you integrate custom fonts in a Flutter app?

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  • 26.

    Explain the use of the Stack widget.

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  • 27.

    What is the purpose of the SafeArea widget?

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  • 28.

    How do you use the GridView widget?

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  • 29.

    What is the FloatingActionButton and where is it typically used?

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Flutter State Management


  • 30.

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

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  • 31.

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

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  • 32.

    Discuss the Provider package for state management.

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  • 33.

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

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  • 34.

    How do you manage global state in a Flutter application?

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  • 35.

    Explain how the setState method works.

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  • 36.

    What is the InheritedWidget in Flutter?

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  • 37.

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

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Flutter Animation and Graphics


  • 38.

    How do you create basic animations in Flutter?

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  • 39.

    Explain the animation controller.

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  • 40.

    What are tween animations, and how are they used?

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  • 41.

    Describe how to create a custom painter in Flutter.

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  • 42.

    How do you make use of the Canvas object?

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  • 43.

    Discuss ways to optimize animations in Flutter.

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Flutter Interactivity and Gestures


  • 44.

    How do you detect and respond to gestures in Flutter?

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  • 45.

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

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  • 46.

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

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  • 47.

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

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Flutter Navigation and Routing


  • 48.

    What is routing in the context of Flutter apps?

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  • 49.

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

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  • 50.

    Explain the Navigator class and its main methods.

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  • 51.

    What is the Route class and its importance?

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  • 52.

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

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  • 53.

    Discuss the concept of deep linking in Flutter applications.

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Flutter Data & Backend Integration


  • 54.

    How do you integrate REST APIs in a Flutter application?

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  • 55.

    Explain JSON serialization in Flutter.

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  • 56.

    How do you manage local storage in Flutter?

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  • 57.

    Discuss the use of GraphQL in Flutter.

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  • 58.

    Explain the use of the http package for network calls.

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Flutter Testing


  • 59.

    What types of tests can you perform in Flutter?

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  • 60.

    Explain widget testing in Flutter.

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  • 61.

    What is the role of the testWidgets function?

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  • 62.

    How do you mock dependencies in Flutter tests?

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  • 63.

    Describe integration testing and its importance in Flutter apps.

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Flutter Packages and Plugins


  • 64.

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

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  • 65.

    What is the significance of the pub.dev repository?

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  • 66.

    Can you explain how to create a Flutter plugin?

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  • 67.

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

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Flutter Performance and Optimization


  • 68.

    What techniques are used for performance profiling in Flutter?

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  • 69.

    How can you reduce the app size in Flutter?

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  • 70.

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

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  • 71.

    Explain the use of the RepaintBoundary widget.

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  • 72.

    How do you monitor and reduce memory usage in Flutter?

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Flutter Best Practices


  • 73.

    What are some best practices for app design in Flutter?

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  • 74.

    How should you structure a large-scale Flutter application?

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  • 75.

    Discuss the importance of code linting and formatting in Flutter.

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  • 76.

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

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Flutter for Desktop and Web


  • 77.

    How do you compile a Flutter web app?

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  • 78.

    Explain the process of building a desktop app with Flutter.

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  • 79.

    Are there any limitations of Flutter for web or desktop development?

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  • 80.

    How do you handle responsive design in Flutter?

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Flutter Advanced Concepts


  • 81.

    What are Custom Widgets and how do you create them?

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  • 82.

    Discuss the use of Isolates for concurrency in Flutter.

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  • 83.

    Describe the concept of Streams in Flutter.

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  • 84.

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

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  • 85.

    Explain how to use Mixins in Flutter development.

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Flutter Platform Specifics


  • 86.

    How do you style StatusBar in iOS and Android with Flutter?

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  • 87.

    How do you handle platform-specific UI components?

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  • 88.

    Can you modify the app’s icon and launch screen in Flutter apps?

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Flutter and Continuous Integration/Deployment


  • 89.

    How do you integrate a Flutter app with CI/CD pipelines?

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  • 90.

    What are the common tools used for CI/CD in Flutter development?

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Flutter and Version Control


  • 91.

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

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Flutter Asynchronous Programming


  • 92.

    How do you work with Futures and Promises in Flutter?

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  • 93.

    Explain the use of the async and await keywords.

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  • 94.

    How do you handle exceptions in async code in Flutter?

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Flutter Release Management


  • 95.

    What are the steps to publish a Flutter app on the App Store or Google Play?

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  • 96.

    How do you manage different release flavors in Flutter?

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Flutter Recent Updates and Ecosystem


  • 97.

    What were the significant updates from the latest Flutter version?

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  • 98.

    How does the Flutter ecosystem support the growth and maintenance of packages?

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  • 99.

    Discuss the role of Dart FFI (Foreign Function Interface) in Flutter apps.

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Flutter Community and Resources


  • 100.

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

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