Are you in need to hire an Android developer for your business? This should be a relatively easy undertaking if you have prior expertise with developer recruitment and hiring. Hire Android developer, however, might be just as challenging if you have yet to gain any technical experience as starting a diet on a Monday. Even if you may have seen several applicants, if you don’t know what questions to ask, you risk passing on the most outstanding candidate applicants; if you don’t know what questions to ask, you risk passing on the most exceptional candidate for your team. We will provide 10 Android interview questions that Ihor, our director of recruitment, developed in this post to assist you in getting ready for your forthcoming interviews.
Why Should You Create a Mobile App for Android?
This is the question of the century for companies who need help deciding whether to use iOS or Android to develop an app. Both operating systems offer benefits and drawbacks of their own, among other things. Android, on the other hand, is questionably in charge of the app market. No other operating system has as many apps as Android does. This is mainly due to the considerable price disparity between iPhones and Android smartphones when comparing costs.
Did you know the Google Play Store offers around 2.56 million Android applications?
10 Questions to Ask Your Applicant During an Android Interview!
If you want to be in control of every stage of the procedure, we’ve chosen 10 Android interview questions for seasoned developers that may act as a general guideline to help you get the expertise you need.
- What Are the Many Services Available for Android?
Even when the user is not engaging with the programme, a service is a component that does lengthy activities in the background. Three different service categories exist:
- Services that are visible to the user are in the foreground.
- A background service does a task that the user needs to be made aware of.
- Bound service provides a client-server interface so that components may communicate with it, make requests, and get responses.
- Describe Each Android Permission Level.
With Android, there are four types of permission protection:
1) Normal – It consists of a permit with a lower degree of security that grants access to certain application-level functionalities to requesting apps.
2) Dangerous – This is a permit with a greater risk. Any risky permissions an application requests may be exposed to the user and asked for before continuing.
3) Signature – The system will permit this permission if the application seeking it is logged with the same certificate as the app that declared it.
4) SignatureOrSystem – The system only provides this permission to programmes that are either part of the Android system image or signed using the same certificate as the programme initially requested.
- Describe the distinctions between the terms Handler, AsyncTask, and Thread.
The three components provide various functions. The Handler class offers a straightforward conduit for sending data to this thread and is used to register to a line. Moreover, it enables you to reply to the UI thread from a different background thread. The establishment of a background process and synchronization with the main thread are handled by the AsyncTask class. The fundamental component of multithreading is the thread.
- Explaining ThreadPools
A thread pool is a collection of worker threads and a task queue that enables a job to execute on numerous concurrent instances. Having several tasks waiting to perform on a single line is less effective than utilizing a ThreadPool, which is one of its advantages. Also, it saves you from creating (and destroying) a thread each time a worker thread is needed.
- What Distinguishes an Action from a Fragment?
A concentrated action that a user may do constitutes an activity (like sending an email). Although some tasks are pretty straightforward, others developers have designed are incredibly complicated. Activity implementations may use the Fragment class to provide more module code, construct complex user interfaces, or create more extensive displays, among other things.
A fragment is a modular portion of an activity with its own input events and lifecycle and can be added or deleted as needed. The lifespan of a host directly influences the lifecycle of a fragment.
- What Exactly Is an ANR Mistake, and How Can You Prevent One?
When an Android application is inactive for more than 5 seconds, an ANR (Application Not Responding) error is shown to the user. This is often the result of blocking the main thread. An app should perform long-running database or network actions in different lines to prevent ANR; try to keep as much work off the main thread as possible.
- What Are the Seven Android Activity Lifecycle Methods, and What Do They Serve?
The seven Android activity lifecycle methods are as follows:
They are designed to make it easier to organize your code around the actions you want an activity to do during its entire lifespan on the device.
- What Are Launch Modes, Exactly? Explain
A new instance of an activity is connected to the existing task via a launch mode. There are two types of launch mechanisms:
1) Manifest file: You may indicate how an activity should associate with tasks when it begins by defining it there. Valid values consist of the following:
2) Intent flags: When calling startActivity(), the Intent parameter may include a flag specifying how the new activity should be related to the existing task.
- Name the Elements That Make up the Android Architecture.
The following are the parts of the Android architecture:
- Linux Kernel: The application’s foundational layer that communicates with a device’s hardware directly.
- Native Libraries: A collection of open-source libraries, including libc, the WebKit browser engine, and the SQLite database, are built on top of the Linux kernel.
- Android Runtime: Every Android app is able to launch its processes thanks to the DVM, which is at the same level as native libraries in the Android Runtime.
- Application Framework: It offers more advanced services, including Activity Manager, Content Providers, Resource Manager, Notifications Manager, and View System.
- Applications: The Android app itself is the top layer.
You are not alone if you are unsure how to conduct a good interview or find productive and effective Android engineers for your company. When it comes to recruiting talent, the IT sector is one of the most competitive, and not all businesses can afford to pay Silicon Valley prices.