Xamarin Interview Questions And Answers

Xamarin Interview Questions And Answers prepared from Codingcompiler experts. These Xamarin Interview Questions were asked in various interviews conducted by top multinational companies across the globe. We hope that these interview questions on Xamarin will help you in cracking your next job interview. All the best and happy learning.

In this article, you’ll learn

Xamarin Interview Questions
Xamarin Interview Questions And Answers
Advanced Xamarin interview Questions And Answers
The Best Xamarin Interview Questions And Answers

Xamarin Interview Questions

  1. What is Xamarin?
  2. What are the disadvantages of Xamarin Development?
  3. How to do Xamarin.Android applications work?
  4. What are Commands in Xamarin.Forms?
  5. What are the types of a programming language that support Xamarin development?
  6. What are the types of elements that are used in the Xamarin?
  7. What are the reason to use Xamarin for cross-platform development?
  8. What are the types of apps that are built with Xamarin?
  9. What is XAML?
  10. What are the different types of layout control present in the Xamarin .forms?

Xamarin Interview Questions And Answers

Q. What is Xamarin?


Answer: Xamarin is a company that builds the software. The main operation of Xamarin is to build mobile apps that work on cross-platforms. It is used to build the UI for Android, iOS, and Windows operating system. Xamarin application shares the codebase. Xamarin’s feature is similar to the native application. A developer can download the Xamarin tools in Visual Studio.

Q.  What are the disadvantages of Xamarin Development?

Answer: Disadvantages of Xamarin app Development are:

  • The development of user interfaces in Xamarin is Time-Consuming.
  • The apps created in Xamarin have a large file size. These apps are mostly between the 3 MB to 15 MB in size in the store.
  • Even apps share the code across the platform, but there is also a need for the developer to create the linkage in the OS, which is difficult for the user.

Q. How to do Xamarin.Android applications work?

Answer: Xamarin.Android applications depend on Microsoft’s Mono Virtual Machine. Mono is Microsoft’s open-source implementation of the .Net Framework based on open standards for C# and CLR. Launched in the year 2001, it was mainly created to allow .Net applications to work on Linux platform, but was later modified to support development on various devices including embedded systems.

In Xamarin, Mono works in parallel with Android’s ART. On Android, most of the system facilities like Audio, Graphics, OpenGL, and Telephony are not available directly to native applications, they are only exposed through the Android Runtime Java APIs residing in one of the Java.* namespaces or the Android.* namespaces. The native applications interact with the exposed .NET APIs. These APIs then, through Android Binding call the underlying Android Runtime Java APIs. The architecture is roughly like this.

Q. What are Commands in Xamarin.Forms?

Answer: While writing an application with MVVM, developers specify data bindings in the View Model to bind the UI and the underlying code. Sometimes it may be required that instead of simple properties, the app may have to react to commands initiated by a user that affect something in the View Model. Such commands are generally associated with button clicks of a button or Tap event of a gesture and are handled by the appropriate background handler. These Commands, that implement the ICommand interface, define the operation to be performed when the appropriate Click or Tap is performed. To use the command interface, one has to define a data binding that targets the Command Property of the Button whereas the source is a property in the ViewModel of type ICommand.


Q. What are the types of a programming language that support Xamarin development?

Answer: Xamarin is unique in the sense that it helps in offering a single language that includes C#, class library and runtime. These types of languages work across all three mobile platforms that are iOS, Android and Windows.

Q. What are the types of elements that are used in the Xamarin?

Answer: The following are the types of elements that are used in the Xamarin:

  • C# language
  • Mono .net framework
  • Compiler
  • IDE tools

Q. What are the reason to use Xamarin for cross-platform development?

Answer: The following are some of the reasons to use Xamarin for cross-platform development:

  • Less to learn
  • No limits
  • Faster time to market
  • Fewer Bugs
  • Readiness for future

Advanced Xamarin interview Questions And Answers

Q. What are the types of apps that are built with Xamarin?

Answer: The followings are the 5 types of apps that are built with Xamarin- goal 2014 football manager, the secret society, iLearn for kids, parental access and Toolwiz cleaner.

Q. What is XAML?

Answer: XAML stands for the Extensible Application Markup Language. XAML allows defining the user interface in Xamarin. Forms application use the markup language rather than code.

Q. What are the different types of layout control present in the Xamarin .forms?


Answer: There are different types of layout controls present in the Xamarin .forms. Some of them are:

  • Content presenter
  • Content view
  • Frame
  • Scroll view
  • Template view
  • Absolute layout
  • Grid
  • Relative layout
  • Stack layout

Q.  How to set up the Xamarin?

Answer: The following are the 4 simple steps to set up the Xamarin:

  • Download the Xamarin installer
  • Run the installer
  • Configure it
  • Activation of Xamarin

Q. What is the difference between Native App and Cross Platform APP?

Answer: 

  • Native App: If we want to develop native apps, we need to choose the specific native language (C#, Objective-C, Swift, and Java) for developing specific native app for Windows, Android, iOS.
  • Cross Platform App: This is the way to develop all three mobile apps using single code base wrapped in a native application layer, but it always requires customization of interfaces to native languages.

Q. Why Xaml in Xamarin.Forms?

Answer: 

  • XAML(Extensible Application Markup Language) allows developers to define user interfaces in Xamarin.Forms applications using markup rather than code.
  • XAML defines the visual appearance of a UI, and an associated code-behind file defines the logic. The UI design can be adjusted without necessarily making changes to the logic in code-behind. XAML in this role simplifies the workflow between individuals who might have a primary visual design responsibility and individuals who are responsible for app logic and information design.

Q. What are the different ways to make Xamarin apps?

Answer: Mainly, there are two ways to get the job done. The first is the Xamarin.forms, and the other one is the traditional Xamarin approach.

Q. How to decide which way to use to Xamarin apps?

Answer: For all those applications where you either code sharing is the priority rather than unique UI or that need very less custom functionality, then Xamarin.froms can be used. On the other hand, you can use Xamarin native for all those apps where custom UI is the priority or you have to make custom interactions.

Q. Do you know about application package modes?

Answer: There are two modes to choose from. The first one is the release mode and the other one is debug. Both of them have their own requirements and are used when necessary.

Q. Mention the different Xamarin.forms techniques to share codes.

Answer: Shared projects and PCL are ways to share codes.

Q. What are the reasons to use XAML?

Answer: XAML is a language used by developers which helps them in specifying the UI with the help of markup instead of any code.


The Best Xamarin Interview Questions And Answers

Q. What are the reasons to avoid XAML?

Answer: Even though XAML is a great technique, but still it has some disadvantages. The reason why it should be avoided is that it does not has any code. Moreover, you cannot define loops of conditional processing.

Q. Define Grid

Answer: Grid is a layout control in Xamarin.forms which displays information in columns and rows.

Q. What are the usage of Xamarin?

Answer: Xamarin gives all the versatility to create the middle method of reasoning using the C# and besides gives the extensibility to structure the nearby UI for all of the stage.

Q.  What number of Major Awards Has Xamarin Won, What Were They?


Answer:
This mentioning is possibly displayed in the event that you are searching for after a higher solid advancement in the partnership, they may to be certain need to see your examination of them. Xamarin has won 2 principal abilities: Visionary in the Gartner Magic Quadrant for Mobile Application Development Platforms and the Dr. Dobbs Jolt Award for Mobile Development Tools.

Q. What are the advancement approaches in xamarin?


Answer: Xamarin has two techniques for building cross-stage versatile applications: Xamarin Forms – You can utilize Xamarin. Structures when you need to plan your application one time and offer it over all stages with some minor code changes.

Q. Why xamarin is utilized?


Answer: A key advantage of utilizing Xamarin is that the application UI utilizes local controls on every stage, making applications that are vague from an application written in Objective-C or Java.

Q. What are the IDE’s we can use for Xamarin App Development?

Answer: 

  • Xamarin Studio: This is Xamarin’s C# developer environment that runs on both Windows and Mac. Xamarin Studio has many of the features of Microsoft’s Visual Studio and uses exactly the same formats as Visual Studio: solutions (.sln) and C# projects (.csproj).
  • Visual Studio: Xamarin offers a Visual Studio extension/plugin for visual studio 2012, visual studio 2013 update 1. And now Xamarin development is directly available from Visual studio 2015.

Q. What are the different types of data binding modes in Xamarin?

Answer: The following are the different types of data binding modes in Xamarin:

Default
One way – changes in the source affects the target
One way to the source – changes in the target affect the source
Two way – changes in the source and target affect each other

Q. What is the difference between Xaml & axml in Xamarin Technology?

Answer: 

  • AXML and XAML are two different XML specifications.
  • AXML is just supported/available for Xamarin.Android.
  • XAML is the way Xamarin Forms could standardize Cross Platform UI based on XML specification.
  • XAML is the way Xamarin Forms could standardize Cross Platform UI based on XML specification.
  • If you are using native Xamarin Android you will do UI using axml, if using Forms then using XAML.

Q. What does Pages in Xamarin.Forms?

Answer: The Page class is a visual element that occupies most or all of the screen and contains a single child. And pages in xamarin.forms are directly mapped to like below:

  • In iOS  it is a View Controller
  • In Windows Phone it is a Page.
  • In Android it is a Activity.

Q. What is Views?

Answer: Views are commonly known as controls of widgets. And they can refer to visual objects such as Label, Button, Entry, Image, BoxView, ListView, TableView..etc. All UI elements are typically are sub-classes of View.

Q. What is Cell in Xamarin.Forms?

Answer: Simple it is not a visual element, but it just describes a template for creating a visual element. And one important note is that Cells are elements designed to be added to ListView or TableView controls.

Q. How to write platform specific code in PCL project of Xamarin.Forms?

Answer: 

We already know compiler directives concept (#ifdef option) is not available in PCL . But in alternative we have majorly there are three ways to create platform specific code in PCL project.

  • DependencyService: It can allow apps to call into platform-specific functionality from shared code. This functionality enables Xamarin.Forms apps to do anything that a native app can do.
  • Device: It is a class containing a number of properties and methods to help developers customize layout and functionality on a per-platform basis. (Ex:Device.OnPlatform, Device.OS, Device.Idiom..etc)
  • Custom Renderers: By default each page, layout, and control in xamarin.forms are rendered differently on each platform, using a Renderer class that in turn creates a native control, arranges it on the screen, and adds the behavior specified in the shared code. But using Custom renderers, developers can be used for small styling changes or sophisticated platform-specific layout and behavior customization.

Q. What is Data Binding in Xamarin?

Answer:

  • Data binding is a technique to automatically synchronize a user interface with its data source. When a binding is established and the data or your business model changes, then it reflects the updates automatically to the UI elements and vice versa. 
  • Data binding connects two objects, called the source and the target. The source object provides the data. The target object, which must be a bindable property, will consume (and often display) data from the source object. It is also possible to bind, not to a standard data source, but to another element on the page.

Q. Which is better xamarin or Cordova?

Answer: On the other hand, one of the key favorable circumstances of Xamarin is the capacity to produce reusable code – up to 80%. Be that as it may, a similar code-sharing levels in Cordova can be accomplished through the intensity of CSS structures. Xamarin additionally offers extensively better UX, usefulness and execution

Q. Which is better ionic or xamarin?

Answer: Ionic offers normal client experience, as it uses web advancements to create crossover applications. Though, Xamarin offers top notch local applications with the best client experience. Henceforth, Xamarin is the best choice in the event that you are going to experience with the applications in the market.


Q. What number of tamarin designers are there?

Answer: As per Xamarin, the cross-stage apparatus is utilized by over 1.4 million designers around the world. Also, Xamarin items are utilized by more than 15,000 organizations from more than 120 nations in various ventures, for example, media, transportation, fund, medicinal services, and gaming.

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