Mobile apps help organizations create brand awareness, deliver personalized content, boost customer engagement, reduce costs, and increase sales. The popularity of mobile apps can be recognized by the fact that more than 2.5 million apps are available on Google Play. The growth over the years cannot be doubted and with the constant development of technologies, like the Internet of Things, Chatbots, Artificial Intelligence, Machine Learning, Blockchain, Augmented and Virtual Reality we can definitely say that it does not appear like something is about to change in the near future. This leads us to a greatly significant conclusion.
The demand for Android developers will be reaching the highest point, but so will the number of applicants for this job. Whether you want to hire a software engineer or you are an Android developer yourself, you must be aware that the most crucial element of the hiring process is the interview. This is the part where not only the applicant’s knowledge should be thoroughly verified, yet also his thinking process. In order to achieve the desired results, you need to be perfectly prepared for the interview.
Before you proceed with the interview, it is important to quickly screen the resumes to find out whether the candidate is suitable for the position he is applying for. Quick elimination of week candidates may save you hours of unfruitful interviews, so take a close look at primary features and skills that junior, mid and senior Android developer should possess:
The ultimate goal of an interview is to verify if the applicant is a good (or bad) fit to a company. Here are some signs that should warn employers about a potentially mediocre employee.
Normal permissions – cover areas where your app needs to access data or resources outside the app’s sandbox, but where there is very little risk to the user’s privacy or the operation of other apps. For example, permission to set the time zone is a normal permission. If an app declares in its manifest that it needs normal permission, the system automatically grants the app that permission at install time. The system does not prompt the user to grant normal permissions and users cannot revoke these permissions.
Signature permissions – the system grants these app permissions at install time, but only when the app that attempts to use permission is signed by the same certificate as the app that defines the permission.
Dangerous permissions – cover areas where the app wants data or resources that involve the user’s private information, or could potentially affect the user’s stored data or the operation of other apps. For example, the ability to read the user’s contacts is a dangerous permission. If an app declares that it needs a dangerous permission, the user has to explicitly grant the permission to the app. Until the user approves the permission, your app cannot provide functionality that depends on that permission. To use dangerous permission, your app must prompt the user to grant permission at runtime.
Special permissions – there are a couple of permissions that don’t behave like normal and dangerous permissions. SYSTEM_ALERT_WINDOW and WRITE_SETTINGS are particularly sensitive, so most apps should not use them. If an app needs one of these permissions, it must declare the permission in the manifest, and send an intent requesting the user’s authorization. The system responds to the intent by showing a detailed management screen to the user.
Construction arguments for a Fragment are passed via Bundle using the Fragment.setArgument(Bundle) method. The passed-in Bundle can then be retrieved through the Fragment.getArguments() method in the appropriate Fragment lifecycle method.
It is a common mistake to pass in data through a custom constructor. Non-default constructors on a Fragment are not advisable because the Fragment may be destroyed and recreated due to a configuration change (e.g. orientation change). Using #setArguments()/getArguments() ensures that when the Fragment needs to be recreated, the Bundle will be appropriately serialized/deserialized so that construction data is restored.
Kotlin is a language explicitly designed to build Android apps. It first appeared in 2011 and can interoperate with Java. Kotlin is simpler than Java and does not contain many unnecessary features that slow down the development process. In May 2019 Google announced that from then on Kotlin became a preferred programming language for Android apps development.
The aim of Android developer interviews is to test the applicant’s technical knowledge and skills to the fullest. At DevsData we believe that the above-presented questions will help you to get thoroughly prepared for the interview.
Anyway, there is one thing related to the interview that is rarely distinguished, yet greatly significant – soft skills. Programming revolves mostly around teamwork. It might not matter how huge your technical knowledge is if you are not able to communicate properly or organize your work. The key to being an exceptional programmer is finding a balance between what your knowledge is and how you work. So do not rest on laurels, keep developing.
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