Top 20 Flutter Interview Questions and Answers 2024

To integrate an API in a Flutter app, you need to make HTTP requests using packages like http or dio.

• Import the http or dio package in your Flutter project

• Create a function to make the API request using the package's methods

• Parse the response data and update the app's state or UI accordingly

Stateful widgets can change their state during runtime, while stateless widgets cannot.

• Stateful widgets have a mutable state that can be modified.

• Stateless widgets are immutable and cannot be modified once created.

• Stateful widgets are used when the UI needs to change dynamically based on user interactions or other factors.

• Stateless widgets are used when the UI does not need to change and can be purely based on the input parameters.

• Stateful widgets use the 'State' class to man...read more

State management in Flutter is done using various approaches like setState, InheritedWidget, Provider, BLoC, Redux, etc.

• setState is the simplest approach for small apps with few widgets.

• InheritedWidget is used for sharing data across the widget tree.

• Provider is a popular state management solution that uses InheritedWidget internally.

• BLoC (Business Logic Component) separates business logic from UI and uses Streams to manage state.

• Redux is a predictable state container that use...read more

Flutter is a UI toolkit for building natively compiled applications for mobile, web, and desktop from a single codebase. Dart is the programming language used with Flutter.

• Flutter is a framework developed by Google for building cross-platform applications.

• It allows developers to write code once and deploy it on multiple platforms like iOS, Android, web, and desktop.

• Dart is the programming language used with Flutter, known for its fast performance and ease of learning.

• Flutter ...read more

Streams in Flutter are sequences of asynchronous events.

• Streams are used for handling asynchronous data in Flutter.

• They allow for listening to a sequence of events over time.

• Stream controllers are used to add events to a stream.

• StreamBuilder widget can be used to build UI based on stream data.

• Examples include listening to user input changes or fetching data from an API.

React Native has a larger community and better support for native modules.

• React Native has a larger community and better support for native modules.

• React Native is more mature and stable compared to Flutter.

• React Native has better performance and faster development time.

• React Native is easier to learn for developers who are already familiar with React.

• React Native has better integration with third-party libraries and tools.

Flutter is a cross-platform mobile development framework created by Google, allowing developers to build native-like apps for both iOS and Android using a single codebase.

• Flutter uses a single codebase for both iOS and Android, reducing development time and effort.

• Flutter has a hot reload feature, allowing developers to see changes instantly without restarting the app.

• Flutter provides a rich set of customizable widgets, making it easy to create visually appealing UIs.

• Flutter ...read more

To implement Map in Flutter, use the Google Maps Flutter plugin and follow the documentation.

• Use the Google Maps Flutter plugin to integrate maps in your Flutter app

• Follow the plugin documentation for step-by-step instructions on implementing maps

• Add API keys and configure map settings as needed

The Flutter widget is a basic building block for creating user interfaces in Flutter applications.

• Widgets are used to create the UI elements of a Flutter app

• There are two types of widgets: stateless and stateful

• Examples of widgets include Text, Image, Container, Row, Column, etc.

HTTP process in Flutter involves making network requests to fetch data from servers.

• Use packages like http or dio to make HTTP requests in Flutter.

• Send requests to a server using methods like GET, POST, PUT, DELETE.

• Handle responses using Future and async/await.

• Example: Making a GET request to fetch data from an API.

Stateful widgets maintain state that can change over time, while stateless widgets do not.

• Stateful widgets can be updated and rebuilt multiple times, while stateless widgets are immutable.

• Stateful widgets are useful for UI elements that need to change dynamically, such as forms or animations.

• Stateless widgets are more efficient as they don't need to track changes or rebuild themselves.

• Examples of stateful widgets include TextField, ListView, and FloatingActionButton.

• Examples ...read more

Stateful widgets maintain state while stateless widgets do not.

• Stateful widgets can be updated dynamically while stateless widgets cannot.

• Stateful widgets are more complex and require more resources than stateless widgets.

• Examples of stateful widgets include text fields and checkboxes, while examples of stateless widgets include icons and text labels.

State management tools in Flutter help manage the state of widgets and data in an efficient way.

• Provider: A simple way to manage state in Flutter applications.

• Bloc: A predictable state management library that helps manage the state of widgets.

• GetX: A lightweight and fast state management solution for Flutter applications.

• Riverpod: A provider package that helps manage state and dependencies in Flutter.

• Redux: A predictable state container for Flutter applications.

Stateful widgets maintain state that can change during the lifetime of the widget, while stateless widgets do not have any internal state.

• Stateful widgets have a createState() method that returns a State object, which can hold mutable state data.

• Stateless widgets are immutable and their properties are set at the time of creation.

• Stateful widgets are used when the UI needs to update based on user interactions or other events.

• Stateless widgets are used for static content that d...read more

Stateless widgets are immutable and do not store any state, while stateful widgets can change their state during the lifetime of the widget.

• Stateless widgets are immutable and do not have any internal state

• Stateful widgets can change their state during their lifetime

• Stateless widgets are simpler and more efficient than stateful widgets

• Examples: Text, Icon, Image are stateless widgets. Checkbox, Slider, Form are stateful widgets

Yes, Flutter is a popular open-source UI software development kit created by Google for building natively compiled applications for mobile, web, and desktop from a single codebase.

• Flutter is used for developing cross-platform mobile applications.

• It uses Dart programming language.

• Hot reload feature allows developers to see changes instantly.

• Flutter has a rich set of pre-built widgets for building UI.

• Popular apps like Google Ads, Alibaba, and Reflectly are built using Flutter.

Stateful widgets maintain state that can change over time, while stateless widgets do not.

• Stateful widgets can be updated and rebuilt multiple times, while stateless widgets are immutable.

• Stateful widgets are used when the UI needs to change dynamically based on user interactions or data changes.

• Stateless widgets are used when the UI remains the same regardless of any changes in the app's state.

• Stateful widgets use the 'State' class to manage their state, while stateless widg...read more

State management in Flutter is crucial for managing the state of widgets and data throughout the app.

• Flutter provides various options for state management such as setState, InheritedWidget, Provider, Bloc, Redux, MobX, etc.

• Provider is a popular state management library in Flutter that allows for efficient and scalable state management.

• Bloc is another commonly used library that helps in managing the state of the app by separating the business logic from the UI.

• Redux and MobX a...read more

I have been using Flutter for 2 years.

• I started learning Flutter during my final year of college.

• I have completed multiple projects using Flutter, including a social media app and a productivity tool.

• I regularly attend Flutter meetups and workshops to stay updated on the latest trends and best practices.

Stateful widgets can change state during runtime, while stateless widgets are immutable and cannot change state.

• Stateful widgets have a mutable state that can change during runtime.

• Stateless widgets are immutable and their state cannot change once they are built.

• Stateful widgets are used when the UI needs to dynamically update based on user interactions or data changes.

• Stateless widgets are used for static content that does not change.

• Example: A counter app would use a statef...read more

Stateful widgets maintain state that can change over time, while stateless widgets do not.

• Stateful widgets have a mutable state that can be changed during the lifetime of the widget.

• Stateless widgets do not have any internal state and are immutable once built.

• Stateful widgets are useful for components that need to update their state dynamically, like forms or animations.

• Stateless widgets are more efficient as they do not need to manage state changes.

• Example: A counter widget ...read more

Stateful widget life cycle includes createState, initState, didChangeDependencies, build, didUpdateWidget, deactivate, dispose.

• CreateState method is called to create the state object associated with the widget.

• InitState method is called when the stateful widget is inserted into the tree.

• DidChangeDependencies method is called when a dependency of this State object changes.

• Build method is called to actually build the widget.

• DidUpdateWidget method is called when a new instance o...read more

Bloc (Business Logic Component) helps in managing state and events in Flutter applications.

• Benefits of bloc include separation of concerns, easier testing, and improved code organization.

• Bloc helps in managing complex state changes and makes it easier to handle asynchronous operations.

• Disadvantages of bloc include increased boilerplate code and a steeper learning curve for beginners.

• Bloc may not be necessary for simple applications with minimal state management needs.

No, Flutter is not a language. It is an open-source UI software development kit created by Google.

• Flutter is a framework developed by Google for building natively compiled applications for mobile, web, and desktop from a single codebase.

• Dart is the programming language used to write Flutter apps.

• Flutter uses widgets to create the user interface, allowing for fast development and customization.

• Example: Flutter allows developers to create beautiful and responsive apps for both ...read more