Flutter framework enables us to develop mobile applications for Android and iOS in a platform-independent way. Because of its high performance, simplicity arising from its development, rich UI, Flutter will have a huge impact on the development of feature-packed and good quality mobile applications in the future.
Flutter was initially developed by Google and it is now handled by ECMA. Flutter provides open-source and free UI development support. Through one codebase and programming language, we can create natively compiled and beautiful mobile applications with the UI toolkit. Flutter framework enables us to develop mobile applications for Android and iOS in a platform-independent way. Because of its high performance, simplicity arising from its development, rich UI, Flutter will have a huge impact on the development of feature-packed and good quality mobile applications in the future.
So by learning Flutter you can have a promising career in mobile app development. If you want to master the Flutter framework, enroll in our Flutter training. After completing our Flutter training, go through these Flutter interview questions to prepare for Flutter job interviews.
Based on Applicant’s Skillset, we’ve divided the questions into the following sections.
These Flutter Interview Questions for Beginners are designed with the intent to make you master Flutter basics. They will help you revise the concepts before attending the interviews.
Flutter is a freeware UI software development kit(SDK) or toolkit built by Google for developing web, desktop, and mobile applications through a single codebase. Flutter applications utilize Dart programming language to create the applications. Flutter’s first alpha version was released in 2017. Flutter is optimized for 2D mobile applications that execute on both iOS and Android platforms. Following are the main elements of Flutter:
Dart is a general-purpose and object-oriented programming language with C-language syntax. It is freeware and was built by Google in 2011. Dart programming intends to create the frontend user interface for mobile and web apps.
Following are the primary advantages of Flutter:
Flutter has the below restrictions:
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A Flutter application is defined as the tree of widgets. Every time we try to code for developing anything in Flutter, it will be in the widget. Widgets explain how our application must look like with its present state and configuration. When we make any change in the code, the widget reconstructs its description by computing the difference of current and previous widgets to evaluate the minimum changes to render the UI of the app.
floatingActionButton: Floating Action Button(child: Icon (Icons.Phone))
This widget is utilized to wrap the Column, Container, Row, or other widgets. This widget inserts the filling size around the child widget.
Which image is the run output of the below Dart code?
Image 1 is the output of the Dart code.
This widget enables us to have a specific height or width between the widgets.
The Flutter Interview Questions for Experienced are helpful to get a clear picture of what kind of real-time questions you can face in the job interviews at an advanced level.
The command checks our environment and shows the report of the status of our Flutter and Android studio apart from the IDE software installation.
A Floating action button in the Flutter development is by default a circular icon button, we must insert the icon widget as the child widget of the FloatingActionButton widget.
The following image of this question is the part of the Flutter application interface that contains four TextFields. When the application user types anything in password TextField, every character in the text field is replaced with the stars for hiding the user’s password. For doing this, we must add a particular property TextField widget.
check the below images and answer which of those images is the output of this application?
Image2 is the correct answer.
Container( margin: xxxxxx (vertical: 60.0, horizontal: 100.0), child: Text( " Welcome ", style: TextStyle (fontsize: 20.0), ), ),
We can access the screen size and other properties like aspect ratio, pixel density, etc. through MediaQuery.
Dart does not endorse multiple inheritances. Therefore for implementing multiple inheritances in Flutter. We require mixins. Mixins offer a way for providing a way for writing the reusable class code in multiple class hierarchies.
No, Flutter is the SDK.
Below listed Flutter Developer Interview Questions allow you to learn the essential developer concepts to crack interviews.
Tree Shaking is the optimization technique for removing the unutilized module in the bundle in the build process. It is also the code elimination technique used for optimizing our application.
We use it for managing the local state in a similar stateful widget and its child. The downside is everything is in the same class like UI code, business logic, and mixin UI, which splits clean code principles.
In the provider pattern, we define everything in the separate class indicating that the UI presentation is defined in the different logics that specify in different thus code appears high quality and clean. Moreover, we don’t need to transmit the state from one screen to another through the constructor.
|Hot Restart||Hot Reload|
|It primarily works with States value.||It works with the small r key in the terminal or commands prompt.|
|It enables developers to retrieve completely compiled applications as it destroys the preserved state values and sets them to defaults. Over every Hot Restart, our application widget tree is entirely rebuilt with new typed code.||This feature enables us to rapidly compile the recently inserted code in a file and pass them to the Dart Virtual Machine(DVM). After DVM finishes the update, it instantly updates the app’s UI.|
|It takes longer than Hot Reload for compiling and updating the app.||It allows us to develop UI, insert new features, fix bugs, and make app development rapid.|
Flutter and React Native both are utilized for developing the native hybrid app through the single codebase. These applications can be executed on Android and iOS platforms.
It is the configuration file of the project that utilizes a lot while working with the Flutter project. It enables us to monitor how our application operates. It also enables us to configure the constraints for the application. This file includes:
A package is defined as a set of similar types of interfaces, sub-packages, and classes. The plug-ins and packages allow us to develop the app without developing everything from the packages. In the Flutter, it enables us to import the latest widgets or functionalities into the application. The plugins and packages have a small difference. Basically, packages are the latest elements or code built-in dart programming language, while plugins enable more functionality on the device through native code.
The Stateless widget does not have state information and it remains static across its lifecycle. Stateless widget examples are Row, Text, Container, Column, etc. If the widget or screen includes static content, it must be a Stateless widget, yet if we have to alter the content, it requires it to be the Stateful widget.
A Stateful widget includes the state information. It is described as dynamic as it can alter the inner data in the Widget lifetime. A widget that enables us to refresh the screen is known as a Stateful widget. A Stateful widget does not have the build() method, but it has createState() method, which gives the class that expands the Flutter state class.
When we build the Flutter application the first time, it will take more time. It is because Flutter developed the device-specific IPA or APK file. So, the Xcode and Gradle are used for building the file, taking more time.
Tween Animation is a short form of in-betweening. In the Tween Animation, we must define the starting and endpoint of the automation. It indicates that the animation starts with the starting value, after that, it goes through a series of intermediary values and lastly arrives at the end value. It also offers the curve and timeline that defines the speed and time of the variation.
Today, various companies utilize Flutter to build applications. Following are the popular applications developed on Flutter:
The latest version of Flutter is Flutter - v1.20.4 released on 15th September 2020.
The Famous and Most used database packages in the Flutter are:
The Flutter SDK supports three modes while compiling the application. We can select these compilation modes by relying on where we are in the development lifecycle. Following are the mode names:
Profile Mode is used for measuring the performance of the applications. In the Profile Mode, some debugging capability is preserved for profiling the performance of our app. This mode is deactivated on the simulator and emulator as they are not delegates of the real performance. For profiling the mode, we use the following command:
flutter run --profile
In Flutter, BuildContext is the part of the widgets in the element tree such that every widget has its BuildContext. We primarily use it for getting a reference to another theme or widget. For instance, if we have the material design element, it is needed to reference it to the scaffold. We can retrieve it through the Scaffold. of(context) method.
These Flutter Interview questions will provide yoú with the perception of the type of questions that can be asked in the Flutter job interview. If you have any queries, let us know by commenting in the below section.
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Usha Sri Mendi is a Senior Content writer with more than three years of experience in writing for Mindmajix on various IT platforms such as Tableau, Linux, and Cloud Computing. She spends her precious time on researching various technologies, and startups. Reach out to her via LinkedIn and Twitter.
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