31 Android Interview Questions and Answers 2023

Second round was with bit senior engineer asked my both android, Java based questions. Third round was with a very senior who asked about me and my interest in this company and technology. Then A small application that we need to optimize and fix errors. Once you clear these they will invite you to their office in Bangkok, there 4 discussion with Senior lead and managers.

XML based layouts provide a consistent and standard means of setting GUI format. In general use, layout details are placed in XML files, and all other items are generally placed in a source files. Sticky intent sticks with the Android for future broadcast listeners. For instance, if Battery low event occurs then that intent will be stick with Android, so that if any future user requested for Battery – Low, it will be fired. To provide with the hardware and software features, which the app requires when installing from Google play etc.


If possible, list some use cases in which you almost always use a fragment rather than an activity (e.g. when you use components or data that must persist across varied activities). Android is an open-sourced operating system by Linux that is primarily used in mobile devices like cell phones and tablets. This Linux kernel based system is equipped with high and advanced components that allow developers to create and run apps.

senior android developer interview questions

InterviewFirst round of technical interview covers all the basics of Android and they asked some trivky questions including in depth questios. They mainly concentrate on asking questions in service. And they asled questions on Java multinthread concept. On the other hand, an Intent filter describes the capability of the component. In your View class, add a constructor method, instantiate the Paint object, and retrieve your custom attributes.

Why do we need to call setContentView() in onCreate() of Activity class?

And make no mistake about it; Android is the dominant operating system today. According to Statcounter, Android has a commanding market share of 75.22% versus iOS’ 22.76%, based on figures from January 2018 to January 2019. The demand for trained senior android developer job Android developer professionals consequently remains strong. You can see in this article how and why Android app development trends are on the rise. After that, you’re welcome to adapt to the compilation of questions we’ve provided above.

  • And it will be inefficient to call this function in onResume(), onStart(), and somewhere else because those methods are called more than once.
  • InterviewApplied through LinkedIn, HR scheduled first round.
  • The old Activity has to be destroyed, paused or stopped, and a new Activity has to be created.
  • It contains a graphical interface that emulates an Android-driven handheld environment and allows the developers to debug their codes as per the requirements.
  • I wasted my time here and missed interview with another decent company..
  • Expose the interface by implementing the service to the users.

This round consists of 10 MCQ questions and 2 Coding Questions. The following interview is an Off-campus selection for HARMAN International for Bangalore Location. Tell me about three times in your professional career when you failed. Reuse your own or other developers’ C or C++ libraries.

Senior android developer Interview Questions

Not that one must have a good understanding of Dependency Injection before answering this question. JUnit is a “Unit Testing” framework for Java Applications which is already included by default in android studio. It is an automation framework for Unit as well as UI Testing. Establishing seniority in the world of tech is more problematic than just looking at the number of years of experience. Many developers who identify as seniors have five or more years of professional coding experience behind them. That said, not all senior developers will have five years of professional development under their belt.

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IntentService is a direct subclass for Services that handle asynchronous requests on demand. It is also used to perform a certain task in the background. The instance of IntentService terminates itself automatically when needed. OnCreate() is called when the Activity is created; that is, it is launched or started. (Additionally, this triggers when the orientation is changed.) It is called again when the process is killed, then returned to.

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In most cases, you won’t need to follow all the syntactic aspects of your chosen language since there will be no IDE during the interview; if allowed, you can even resort to pseudo-code. Try to explain all the answers with real-time examples or with instances of your project if it exists. For example, if your manager asks you to select between two technologies, how would you do this? This question tests how well a candidate presents a business case to use a particular type of technology, and what risks and values they consider when making the decision. You’ll need to coordinate well with the development team you’re hiring for.

A Fragment represents a reusable portion of your app’s User Interface. Retained Fragment consists of the configuration change that causes the underlying Activity to be destroyed. The term “retained” refers to the fragment that will not be destroyed on configuration changes. ANR is an abbreviation for Application not responding that describes an unresponsive Android app. An “ANR” event is triggered, When an app is running on an Android device and stops responding. A fragment has its own layout and behavior with its own life cycle callbacks.

What are the tools used to develop an Android app?

The prime aim of a service is to ensure that the application remains active in the background so that the user can operate multiple applications at the same time. A user interface is not desirable for android services as it is designed to operate long-running processes without any user intervention. A service can run continuously in the background even if the application is closed or the user switches to another application. Remember that this interview is designed to identify candidates who have expert knowledge of the required fields and have the required years of experience as a software developer. As a result, candidates can expect to be asked some tough questions about the technical areas which they have highlighted in their resumes, like frameworks, libraries, and past projects.

It is also a class that implements a Runnable interface. The Runnable interface is used extensively to execute code in Threads. Expose the interface by implementing the service to the users. Developers can write and register apps that will only run under the Android environment. Permission allows certain restrictions to be imposed primarily to protect data and code. Without this, codes could be compromised, resulting in defects in the actual function.

senior android developer interview questions

The intent sticks around after the broadcast, which allows others to collect data from it. This is where the intent doesn’t define the target component, requiring the Android system to conduct an evaluation of the components. In the latest update of Android version 6.0, the official Android code name is known as a marshmallow. This was the successor of the Android version 5.0 named as Lollipop.

In Android, Content Providers are a very important component that serves the purpose of a relational database to store the data of applications. The Android system allows the content provider to store the application data in several ways. Users can manage to store the application data like images, audio, videos, and personal contact information by storing them in SQLite Database, in files, or even on a network. For more general interview questions to kick-off your assessment, take a look at ourinterview questionsfor software engineers, with a mix of technical and behavioral interview questions.

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Changing the name of an application may impair some of its functionality. Aproduct flavordefines what is built, such as which resources are included in the build. Abuild typedefines how a module is built, for example whether ProGuard is run. Create a res/values/attrs.xml file and declare the attributes you want to use with your custom https://xcritical.com/ View. Here, you’re checking Senior Android developer 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.

Activities can be closed or can be terminated easily as and when the user wants to. Services are designed to run on the background or behind the scenes and can act independently. Most of the services run on a continuous basis regardless of their certain or no certain activities been executed. AppCompatActivity is the base class for activities with the support library action bar features. ActionBar can be added to your activity by extending this class for your activity and setting the activity theme to Theme when running on API level 7 or higher.

Given a project, was required to refactor it using the MVP pattern an solving hard bugs presents.

It also used to show notifications for a particular interval of time at the bottom of the screen by default. SQLite is an embedded SQL database engine with multiple tables, indices, triggers, and views, contained in a single disk file. SQLite modifies data directly to ordinary disk files. The Intent is used with sticky broadcast, which is called sticky intent.

InterviewAt first they a asked for a skype interview. After that I had a on site interview with one of their Team lead. Then I got a Test Project they asked to fix the project and submit it. On the last stage I had 3 hour Interview with 3 different person. Their interview process was really interactive and that is really good for any developer. It is an acronym for Application Not Responding, a pop-up or notification that is triggered when an application experiences a delay for the user due to too many functions running concurrently.


Questions to Ask Recruiters Before Committing to the Dev Hiring Process

The client receives the Binder and can use it to directly access public method available in either the Binder implementation or the Service. Android is a Linux-based, open-sourced operating system commonly found on mobile devices, such as smartphones and tablets. It’s a kernel-based system that gives developers the flexibility to design and deploy simple and/or advanced apps. Android is an open-source operating system that can be useful for many tasks. An android application will undergo various states that are associatively called as Android Activity Life Cycle. First of all, If you have 2 interviews on a day and 1 with Altimetrik, Please go to the 2nd company..

Here, you’re looking for candidates who feel comfortable making difficult decisions and can efficiently and effectively delegate tasks to their team members. Services in Android are a special component that facilitates an application to run in the background in order to perform long-running operation tasks. Therefore performs the basic as well as the advanced functions.

Learn about top 7 Python portfolio projects to catch your potential employer’s attention, with tips on how to improve your Python portfolio. Need some inspiration and tips for your web developer portfolio? Check out our article to give yourself the best chance of being hired.

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