Mobile App Development Interview Questions and Answers

The interviewing process is hectic but most essential when it comes to the mobile app development process.

Hiring a developer is so tiring. You must go through a lot of work before hiring a developer for mobile app development. You have to ask a bunch of questions to the developers to ensure that you are working with one who has know-how about app development and carries experience well.

There is a list of some interview questions you should ask the mobile app developers along with the answer you should expect from them.

And if you are a developer and preparing for the upcoming interview, so go through the Q&As properly and ensure you know everything about your field of work.

What are the mobile app development interview questions and answers?

Can You Define The Difference Between Implicit And Explicit Intent?

An explicit intent feature is to specify the component to be invoked from the activity. In other words, explicit intent is where you describe the system which scheme or activity component it must use for the response to this intent.

While the implicit intents provide you the authority to assert the action you want to perform. After this, the Android system will check which components are computed to handle that action.

It is important to know when to use each intent among both them. The majority of the time, you have to use explicit intents to start the component in your application. While the implicit intent is useful in communicating with the components from the third-party applications.

Also Know: What is Explicit Compilation?

When Should You Use A Fragment And An Activity?

This is a debatable topic, but there is a thin line between fragments and activity. The code that is responsible for the creation of activity is fundamentally more involved rather than the codes used to create a fragment. If you want to create a new activity, you have to pause, stop, and destroy the previous activity first.

As a developer, this should be acknowledged that the best practice is to only use activities if you need to swap the entire screen and fragments everywhere else.

How Can You Create A Multi-Threaded Android App Without Thread Class?

You should use implement runnable if you only want to override the run () method and don’t want other thread methods. The main purpose of multithreaded android applications is to improve performance and usability.

You can use the spinning-off processor or resource-intensive tasks in their thread for better performance. Technically a thread is a unit of a process, and multiple threads combine together to form a process.

Can You Replace One Fragment With Another?

At runtime, you can add, remove, replace, and perform other actions with the fragments in response to user interaction. Every set of fragments is changed, and it is called a transaction. There is an option for you to specify what to do inside the transaction using the APIs provided by the fragment transaction class.

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You have an area to group the multiple activities into a single transaction. Let’s say in a transaction, anyone can add or replace multiple fragments. This grouping will help you in the future, so you can have multiple sibling fragments displayed on the same screen like a split screen view.

There is also an option to save each transaction to a back stack that is managed by the fragment manager. The manager allows the users to navigate backward via the fragment changes. It is similar to navigating backward via activities.

Can You Define An Adapter?

In Android, an adapter act as a bridge between an adapterview and the primary data for that view. An adapter is an object that accesses the data items. It is also responsible for making a view for every item in a data set.

The common adapters are known as Array Adapters, Base Adapters, Cursor Adaptors, Simple Cursor Adaptors, Spinner Adapters, and Wrapper List Adaptors.

How Can You Prevent The Application Not Responding Error In An App?

The application not responding error pops up when the UR has been unresponsive for more than five seconds. It usually happens because you have blocked the main thread. There are various things you should do to avoid the ANR.

For example, check memory leaks, delete temporary files, perform a virus scan, and more. But to completely avoid it, you should have to work on the main thread as much as possible.

What Is The Use Of Handler?

The handler allows to send and process messages and runnable objects that are associated with a thread’s MesssageQueue. Each handler instance is engaged with a single thread and that helps the thread’s message queue.

In short, the handler is a source of communication between threads. It is commonly used to pass an action from the background thread to the main thread smoothly.

Define: What Are HTTP Handlers?

Can You Describe The Difference Between OnCreate And OnStart?

OnCreate is a term used when an activity is first created. And OnStart is a term used when the activity is ready and visible to the users. OnCreate only is called one time for each life of the activity. But there are many situations where that can use to cause your activity to be killed and brought back to life again.

When Should You Use FrameLayout?

The FrameLayout is basically designed to block out an area on the screen to display a single item. It should be used to hold a single child view because it can be hard to organize the child view in a way that can be scalable to different screen sizes.

Wrapping It Up

So, these are some of the questions that you can ask to process the interview for mobile app development. These questions will help you identify whether the developers are worthy of being hired or not.

The answer will be a great help if you are a developer and preparing for an interview. There are more questions and answers you can find so prepare well before the interview.