These interview questions are commonly asked by technical recruiters to assess your knowledge level, while also getting some useful insight into your attitude towards Android development. Likewise, instead of asking candidates to take a coding test like in a coding interview, it would be better to ask a potential senior developer how they would improve upon existing code. Do not ask senior developers to complete a test to explain a simple algorithm or data structure- most candidates for senior posts haven’t dealt with such matters in years. A job advert for a senior software developer is likely to expect candidates to have already developed high-quality software that was aligned with user needs and business goals.
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 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.
- Brief about yourself and how you have achieved your career growth so far, brief your current position, skills, and passion and then finish by touching the goal of the future.
- LiveData is a lifecycle-aware component and thus it performs its functions according to the lifecycle state of other application components.
- Try to explain all the answers with real-time examples or with instances of your project if it exists.
- Android is an operating system that is built basically for Mobile phones.
- 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.
- 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.
If you want to do company-specific wise problems then do use geeksforgeeks is best but for me, I wanted to try contest so I followed these as mentioned above platforms. The difficulty level of problems will be easy-medium and medium stating that no repeated or easily previous questions are seen on the online test. Dagger is a Dependency Injection framework that will generate a lot of boilerplate code for you to achieve the goal of Dependency injection in Android development. 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.
#17: How Do You Protect An Android App From Reverse Engineering?
It is must host a fragment in an activity and fragments lifecycle is directly related by the host activity’s lifecycle. Android application components are the building block essentially used in the Android application. The application manifest file named Android manifest.xml couples the components.
While the release build type will use a user-defined release certificate for signing and packaging the APK. The requirement of a database in Android is fulfilled by SQLite from the very beginning. However, it comes with some severe drawbacks like not checking the queries at compile-time, it does not save plain-old-Java Objects. Developers also need to write a lot of boilerplate code to make the SQLite database work in the Android OS environment. The Room component comes into the picture as an SQLite Object Mapping Library which overcomes all the mentioned challenges.
To Start With, What Is Android?
The Android platform provides several sensors that are used to monitor the motion of a device. Handlers are mainly used to Update the User Interface from a background thread, Enqueue https://wizardsdev.com/ a task for a different thread and Schedule a task for a specified time. OnDestroy() – The function onDestroy() is called when the activity is cleared from the application stack.
Prepare for these 11 common senior iOS developer interview questions with our guide to making your senior iOS developer interview a success. The code for an activity is far more in-depth than for a fragment. Be sure to mention to your interviewer that due to the extended work, activities should only be used for swapping entire screens, while fragments are used for everything else. 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.
Best Senior Developer Interview Questions
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 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.
It acts as a virtual machine where the Android application runs. It is with the help of Dalvik only that devices can execute multiple virtual machines effectively along with better memory management. The bound service is a server in a client-server interface that allows components such as activities to bind to the service, send requests, receive responses, and perform interprocess communication . The Android software development kit consists of a comprehensive set of development tools that includes a debugger, libraries, a handset emulator based on QEMU, documentation, sample code, and tutorials.
RecyclerView is a ViewGroup added to the Android Studio as a successor of the GridView and ListView. It has been created to make possible construction of any lists with XML layouts as an item that can be customized vastly while improving the efficiency of ListViews and GridViews. This improvement is achieved by recycling the views which are out of the visibility of the user. For example, if a user scrolled down to a position where items 4 and 5 are visible; items 1, 2, and 3 would be cleared from the memory to reduce memory consumption. Gradle is a build system that is used to automate building, testing, deployment, etc. “Build.gradle” are scripts where one can automate the tasks. For example, the simple task to copy some files from one directory to another can be performed by Gradle build script before the actual build process happens.
Although you CAN change it, the real question should be “SHOULD you”? Changing an application’s name risks breaking some of its functionality. We can use a HashMap for it where name will be the key and phone number will be the value. If second time any name appears then its key will be already present in the map and it will be deleted. Behavioral questions can be a useful way of testing how a candidate reacts to certain situations.
Glassdoor has 129 interview questions and reports from Android senior developer interviews. Glassdoor has 129 interview questions and reports from Senior android developer interview interviews. Remember to also tailorinterview questions to suit the specific technologies of your company. So for instance, ask a senior Java developer a specifically tailored Java interview question. Likewise, askAndroiddevelopers about the technologies they would use to create a new Android app. If your company uses a specific programminglanguage, it is good to know that your senior programmer candidate is experienced in that area.
What Is Android Bound Service?
Eager to begin your career as a professional Android app developer? Then get skilled with the Android App Developer Training Course! While there’s no way to guarantee an absolute certainty of success, you can improve your odds by brushing up on some of the most commonly asked questions during an Android developer interview. This article provides a valuable sampling of Android interview questions in all levels of complexity. By familiarizing yourself with these questions, you can boost your confidence and make a better impression.
At the other end of the spectrum, the senior developer might be working on organizational issues or perhaps focusing on activities related to keeping the business profitable. A good senior developer will be able to handle all kinds of challenges that would severely test the abilities of junior or mid level developers. You can inspect classes, interfaces, fields, and method at runtime with the help of reflection and the best part is that you need not know the names of these classes, methods, etc. All objects are allocated on the heap area managed by the JVM. As long as an object is being referenced, the JVM considers it alive. Once an object is no longer referenced and therefore is not reachable by the application code, the garbage collector removes it and reclaims the unused memory.
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.
You have chosen the best clothes, your resume and other reference materials are neatly assembled and ready, and you feel well-rested. Now, if you are looking for a job that is related to the Android developer then you need to prepare for the 2021 Android developer Interview Questions. It is true that every interview is different as per the different job profiles.
Here, the intent does not define the target component, requiring the Android system to evaluate the components. While you CAN change that, the real question must be, “SHOULD you”? Changing the name of an application may impair some of its functionality.
Senior Android Developer Interview
Android is an operating system that is built basically for Mobile phones. It is based on the Linux Kernel and other open-source software and is developed by Google. It is used for touchscreen mobile devices such as smartphones and tablets. But nowadays these are used in Android Auto cars, TV, watches, cameras, etc.
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. Parcelableis optimized for Android, so it’sfasterthan Serializable. It’s also fully customizable, so you can be explicit about the serialization process, which results in less garbage objects. TheContentResolver.query()method returns a Cursor, so you can retrieve data from each column using Cursor methods. ThreadPool consists of a task queue and a group of worker threads, which allows it to run multiple parallel instances of a task.