Android Interview Questions

These include activities such as logging in, viewing the UI elements, intent for invoking individual components, service, content provider for sharing data, fragments, and Android manifest. The Google Android SDK is how to become a mobile developer a toolset which is used by developers to write apps on Android-enabled devices. It contains a graphical interface that emulates an Android-driven handheld environment and allows them to test and debug their codes.

  • Be ready to recall a bunch of Gang of Four patterns and other similar patterns.
  • With code review, after a developer writes a piece of code or a feature, someone else on the team has a look at it.
  • ARC does not increase or decrease the reference count of value types because, when assigned, these are copied.

Watch a few of Uncle Bob’s talks on the topic to fully appreciate the history behind them. Design patterns are a huge topic on their own , so here I’ll only summarize those I see commonly in iOS code bases. You absolutely have to know what MVC is since it’s basic to any iOS development.

Best Programming Languages to Learn in 2022

To receive information from a server without polling via a series of requests, a mobile app might use push notifications. This is a better solution than constantly requesting new data, because it will not drain the battery and will use less network data. The other possibility is Realm, a non-relational database system designed for mobile devices.

Who is the full stack developer?

A full stack web developer is a person who can develop both client and server software. In addition to mastering HTML and CSS, he/she also knows how to: Program a browser (like using JavaScript, jQuery, Angular, or Vue) Program a server (like using PHP, ASP, Python, or Node)

To navigate and use a VIPER stack, you’d instantiate its router and then ask it to create its view controller. Then the VC owns presenter, presenter owns interactor, and interactor owns entities and the router. The resulting view controller is used in your view hierarchy and inserted, pushed, or presented as necessary. This architecture allows for strong encapsulation of logic and scalability for team size since every part of your app is now a VIPER stack. Even though there are a lot of applications out there that were built by solo developers, the complexity of what apps do keeps increasing, demanding that a team of developers work on it. Working in a team poses different challenges in terms of code maintenance, collaboration, and knowledge sharing.

Full Stack Developer Interview Questions

Use examples from previous work to show that you’re a creative person who’s willing to try new things. This question can help the interviewer determine how committed you are to your career and whether you’re likely to stay with their company for a long time. Your answer should show that you have an interest in learning new things, but it’s also important to mention that you’re able to apply what you learn immediately. Bugs are a common occurrence in software development, and the interviewer wants to know how you would handle this situation.

Is JavaScript more powerful than Python?

On this count, Python scores far better than JavaScript. It is designed to be as beginner-friendly as possible and uses simple variables and functions. JavaScript is full of complexities like class definitions. When it comes to ease of learning, Python is the clear winner.

It also shows the interviewer that you are open to learning and adapting to new things. Your answer should show your willingness to try out new technologies, as well as your ability to learn quickly. This question can help the interviewer get a better sense of your work ethic and how you handle challenges. Your answer should show that you are willing to do whatever it takes to complete projects on time, even if they aren’t as exciting as others.

What information do you need before you start coding an app?

Android application development interview questions will focus on the latest trends and topics. With the popularity and open-sourced nature of Android, you need to offer direct methods for protecting user data from reverse engineering.

Explain how you can place everything in the middle of the screen, probably by using the superview’s center, width, and height. Explain how you can place the writing relative to the image, and how the bottom label’s placement is relative to its top label. In the Observer design pattern, an observed object called the Observable will broadcast all its changes to any objects that observe it. An example of an Observer pattern in iOS would be the NotificationCenter. Overriding is the process by which two methods have the same method name and parameters.

What are the different software components of Android Jetpack?

AIDL, or Android Interface Definition Language, handles the interface requirements between a client and a service so both can communicate at the same level through interprocess communication or IPC. This process involves breaking down objects into primitives that Android can understand.

  • Many Cocoa frameworks use GCD and/or NSOperations under the hood .
  • Question lists offer a convenient way to start practicing for your interview.
  • So you have to tell the architecture of the last app you have developed during the college time project or in a real industry project.
  • One way to avoid this is to lessen the number of activities performed by the core UI thread.

The Java bytecode(.class file) generated by the javac compiler is converted into Dalvik bytecode to make the application source files executable on the DVM. Since Android devices have a definite processing capacity, memory, and battery life, the DVM design principle aims to optimize itself so that it can load fastly and run smoothly even on low memory/powered devices. This virtual machine is very efficient in running multiple instances on the same device. As testing becomes a more prominent and important practice in the iOS world, it’s important to know what you’re doing as you write your tests. This question gauges your understanding of testing terminology for objects used to aid in unit-testing. Typical commonly used patterns when building iOS applications are those that Apple advocates in their Cocoa, Cocoa Touch, Objective-C, and Swift documentation. It is a software design pattern Apple chose as the main approach to iOS application development.

The answer to this question is similar to when you are asked to discuss or describe a technique or methodology. If possible, you should try to provide examples similar to the features of the applications you are likely to be working on for the organization. Remember to keep your answers brief and to expect follow-up questions from the interviewer. Mobile apps are a strong tool to leverage in today’s digital world. The difficulty lies in hiring the right mobile app developer for your project. Take the time to interview them thoroughly, as the right questions, and find out if the fee structure is a good fit for your business. Top 5 mobile developer interview questions with detailed tips for both hiring managers and candidates.

mobile developer interview questions answers

You can also mention any personal traits or experiences that may be beneficial in this position. Niels is a seasoned software architect and entrepreneur with over fifteen years of experience. He’s a generalist with strong communication and business skills who speaks the language of customers as well as techies. He has extensive experience as a product architect in B2B hi-tech software as well as B2C web and mobile software.

What Is the Google Android SDK?

Don’t expect someone with no technical background to master this technology, but they should be able to explain how and when they would use it, as well as the benefits it offers. The Serial Queue enables us to complete only one task at a time, regardless of execution method, i.e., Synchronous or Asynchronous. The code executed by the Serial DispatchQueue is not parallel and must wait for the first task to finish. The queues must all wait for the conclusion of the previous queue. Third, according to surveys conducted by Stack Overflow developers rank Swift as being more concise than Java while offering much better performance than both C++ and Java. An Inactive state indicates an app is executing but not currently visible on the device’s screen. The UIKit framework provides the Touch Events, such as gesture recognizers and in-app delegates for handling user interactions.

mobile developer interview questions answers

These sample Application Developer interview questions will help you test technical skills and identify qualified candidates for your roles. You can also use our Boolean cheatsheet template to source professional App Developers. While creating the job ad, you already have a list of soft skills you’re looking for in an applicant. Thus, if the candidate meets your requirements, it’s a win for both of you. And once the developer meets the requirements, it’s time to set up the interview. These possibilities can happen even to the most careful recruiter. However, when you ask the right interview questions, the chances of securing a good hire increases.

This question can help the interviewer get a sense of your knowledge and experience in the field. Your answer should show that you understand the challenges facing developers today, but also how to overcome them. This question can help the interviewer determine how well you work with others and your communication skills. Use examples from past experiences to show that you are a strong communicator who is able to collaborate with other team members.

  • I’ve also included follow-up questions for each, to help you dig down to the most important answers.
  • This is what they recommend to use, and it has the best integration with Xcode.
  • The evaluation is also your chance to demonstrate soft skills such as work ethic, problem-solving, and collaboration.
  • The interviewer will ask operational questions to determine how you perform the work required by the job you’re interviewing for.
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