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What are the biggest challenges faced by mobile app developers?

  • Developing a world-class app.
  • Cross-platform apps.
  • Interactive apps.
  • Involving end user.
  • Battery consumption and performance.
  • Keep it simple.
  • Marketing the app.
  • Choosing development technology.

In particular, be on the lookout for an Android developer demonstrating an understanding that you shouldonlyextend from a class when you need to modify some of its functionality. This is still a much-debated topic, but the code used to create an Activity is fundamentally more involved than the code used to create a Fragment. The old Activity has to be destroyed, paused or stopped, and a new Activity has to be created. The developer should acknowledge that the best practice is to only use Activities when you need to swap the entire screen, and use fragments everywhere else. By creating an account, I acknowledge that I have read and agree to InterviewBit’s Terms and Privacy Policy . Tell about a time when you were part of a development team and had to handle disagreements or differences in development strategies.

How to call another activity in android?

Working in a team poses different challenges in terms of code maintenance, collaboration, and knowledge sharing. 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. Interviewers will want to make sure that you’re a team player who can take direction and work in close collaboration with any number of professionals – including those with and without a technical background.

If you add multiple Views to a FrameLayout then it’ll stack them one above the other, so FrameLayouts are also useful if you need overlapping Views, for example, if you’re implementing an overlay or a HUD element. The onCreate() method is called once during the Activity lifecycle, either when the application starts, or when the Activity has been destroyed and then recreated, for example during a configuration change. An ANR dialog appears when your UI has been unresponsive for more than 5 seconds, usually because you’ve blocked the main thread. To avoid encountering ANR errors, you should move as much work off the main thread as possible. Here, you’re checking that the Android eveloper understands that you need an additional component to connect an AdapterView , to an external data source. An Adapter acts as this bridge, and is also responsible for converting each data entry into a View that can then be added to the AdapterView. When you’re using one of the navigational methods that are closely linked to fragments, such as swipe views.

In what two ways can you transfer data from one ViewController to another?

Every developer has their own style and uses a different approach to creating software, even though they use the same language and platforms. When answering a question like this, you should be specific and provide an example to illustrate your answer. Are you asking the right mobile app developer interview questions? In recruitment, the appropriate questions will typically determine the ultimate success of employee hiring.

  • The activity to be started by the developer is defined by this quick script called explicit intent.
  • IOS Developer interviews can vary—some may ask lots of detailed technical questions, while others may focus on your experiences so far.
  • The Android Framework is an important aspect of the Android Architecture.
  • You don’t want to launch an app that hasn’t been thoroughly tested.
  • If they seem friendly and collaborative, emphasize that you enjoy working in those types of environments.

IOS apps are becoming increasingly complex and MVC design pattern doesn’t hold up well as a large scale application architecture. This is a very advanced question for Seniors, Leads, Architects, etc. Don’t worry if your answers to questions like this are short and to the point. Here, you can explain that synchronous tasks depend on previous tasks being finished before proceeding, while asynchronous tasks can all function at the same time in the background. Application Developers work with one or more programming languages and operating systems to design functional programs. Their role is to understand user requirements and build features that meet these needs.

What is the difference between not-running, inactive, active, background, and suspended execution states?

An android toast provides feedback to the users about the operation being performed by them. It displays the message regarding the status of operation initiated by the user. These are the most common questions asked in a telephonic or first level of technical round. The Design Thinking training course gives you the skills to solve complex business problems using the design thinking process. The process of selecting which implementation of a polymorphic operation to call at run time is called Dynamic dispatch.

  • Functional reactive programming is the new hotness in iOS/Swift, JavaScript, and other dev communities.
  • As the interview progresses, you will receive more senior-level Android engineer interview questions.
  • If you add multiple Views to a FrameLayout then it’ll stack them one above the other, so FrameLayouts are also useful if you need overlapping Views, for example, if you’re implementing an overlay or a HUD element.
  • Design patterns are a huge topic on their own , so here I’ll only summarize those I see commonly in iOS code bases.

This question is a great way to see how passionate you are about programming languages. It also shows the interviewer that you have experience with multiple languages and can adapt to new ones when necessary. When answering this question, it’s important to show your passion for the language you choose while also highlighting your ability to learn new languages.

What are the Core Building Blocks of an Android Application?

You may want to follow up your answer with a question, asking the interviewer what continuing education programs and opportunities the organization offers to its software development team. Java is the most popular language for app development, which makes it ideal even for new Android developers to quickly learn to create and deploy applications in the Android environment. Working with a remote team can be challenging, but it’s also an important skill for mobile app developers. Employers ask this question to make sure you have experience working in this type of environment and how you handled the challenges that came with it. In your answer, share what strategies you used to stay connected with your team members and ensure everyone was on the same page.

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. It’s also available for hybrid solutions like Xamarin or React Native and is more efficient than SQLite. When you ask this question, the candidate must demonstrate an understanding of the complete life-cycle of the development of an app, rather than just the immediate requirements. At Ascendle, we always set projects up on a time and materials basis because it allows the flexibility you need in mobile development – especially when your needs change halfway through. defines iBeacon as Apple’s technology standard which allows Mobile Apps to listen for signals from beacons in the physical world and react accordingly. IBeacon technology allows Mobile Apps to understand their position on a micro-local scale, and deliver hyper-contextual content to users based on location.

How will you communicate with me during the project?

The finished app is built into an IPA file, which has to be signed by some certificates. Xcode helps to do it all automatically using the Distribution Certificate and the Provisioning Profile, which connects the DC to the app ID.

mobile developer interview questions

The ‘defer’ keyword provides a block of code executed in cases when execution leaves the current scope. A ResponderChain is a hierarchy of objects that have the chance of responding to the received events. If data is static and is not likely to change, it can be loaded in viewDidLoad and cached.

Tell about a time when you improved the efficiency or quality of a program. How did you do it?

Teamwork is an important skill for mobile app developers to have, so it’s likely that your potential employer will want to know that you’re willing and able to work with others on a project. The interviewer may ask this question to determine your experience with user interfaces and how you apply that knowledge in your work. If you have previous experience, describe the type of user interface you designed and what tools you used. If you don’t have direct experience, you can talk about your interest in learning more about UI design. PWAs or Progressive Web Applications are a hybrid concept between websites and native mobile applications. The developer needs to demonstrate and understanding of how to eventually enable the release of a PWA, that reuses some of the functionality of the website and mobile apps, WITHOUT rewriting everything from scratch. Next you need to focus on what are the candidate’s app development and other capabilities.

What is the number 1 app in the world?

Instagram: 64 million. Snapchat: 56 million. Cash App: 56 million. Zoom: 52 million.

Alternatively you could go with frameworks like KIF, iOSSnapshotTestCase, EarlGrey. No one writes perfect code, and developers need to debug their code and profile apps for performance and memory leaks. Template is a design pattern where the main concept is to have a base class that outlines the algorithm of how to become a mobile developer what needs to be done. The base class has several abstract methods that are required to be implemented by its concrete subclasses. Users of the Template Method classes only interact using the base class that implements the algorithm steps; concrete implementations of those steps are supplied by subclasses.

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