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The popularity of Android is growing exponentially almost every day. This is the reason why people love to choose android developer as their primary career choice. In this article, we will discuss on popular questions and answers that are usually asked by android developers.
The discussion starts with basic concepts, then it goes tricky later to check the actual proficiency of android professionals. Let us have a quick look at popular Android developer interview questions and answers step by step.
Android is a popular open source operating system compatible with cell phones, tablets, or smart-phones. Here we will discuss on popular interview questions that are divided into three sections further.
These sections are – Android interview questions and answers, Android developer interview questions and answers and the last section is Android tester interview questions and answers. Let us discuss on each of the section in detail further.
Answer: Android is a Linux-based open source OS equipped with high functional components that help developers in writing rich android apps in the easiest way. This is the reason why Android has become a primary career choice for most of the Java developers today.
Answer: Android SDK (Software Development Kit) is a tool-kit that makes development task easy for the developer. The SDK enables the graphic interface for easy testing or debugging of code.
Answer: Here, you will find the complete collection of classes and methods that are necessary to write application code in the Android environment.
Answer: The tool that can be used to work with ZIP components is AAPT (Android Asset Packaging Tool) that handles creation, extraction and viewing all the ZIP contents.
Read: IOS Developer Interview Questions and Answers
Answer: An emulator allows you to play around the interface and it feels like you are working on actual mobile devices only. With the help of an emulator, you can write codes or debug codes securely especially during initial design phases.
Answer: You have to use an “activityCreator” to start a new android project within android IDE. An “activityCreator” is made up of the shell script that will help you in creating fresh file structure to write codes.
Answer: Intents are used to display notification messages on android enable devices. These notifications may be alert messages or any other notifications. The best part is that Android users can also respond to these intents whenever required.
Answer: Activities don’t run continuously and they can be closed or terminated anytime based on user choice. On the other hand, Services run continuously and independently behind the scenes regardless of whether activities are executed together or not.
Answer: The essential items that should be present every time android project is created includes –
Answer: Android Interface Definition Language (AIDL) maintains the communication gap between client and service through IPC. With AIDL, you can break down the objects into small primitives that can be understood by the Android IDE. These primitives can be quickly understood by android without consuming too much memory.
Read: Android Developer Learning Path
Answer: Foreground activity is taken as very important part of the script and it is killed only when consuming too much memory. Once it is killed interface again becomes responsive to the user.
Answer: Yes, it is possible to add fragment without any assistance of user interface. For this purpose, you should use the method add(Fragment, string) to add a fragment from the particular activity.
Answer: Yes, it is possible to delete icons and widgets from home screen of Android device by long pressing and holding that particular icon. Now drag the selected item downward screen and delete it finally.
Answer: Nine-patch image works on nine parameters when resizing an image that includes four corners, 4 edges, and one axis. At the same time, Regular bitmap images work on the overall background image.
Answer: The most popular programming language used for app development is Java that is taken as an ideal choice for Android developers to create or deploy rich android apps in android environment.
Answer: The XML-based layout is a primary choice for Android developers because it provides the most consistent look to the Graphical Interface. This layout allows you to store layout details in XML files while other important information can be stored with source files.
Answer: To manage orientation in android development, you should use the command setOrientation() for VERTICAL or HORIZONTAL alignments.
Answer: Access the “Tools” option from Android SDK and click on ‘Monitor.bat’ file to check the app logs. You can also check various free tools on Google Play to capture the app logs.
Read: Android Developer Roles And Responsibilities: You Need To Know
Answer: As per my opinion, there are lots of things that you cannot check on emulators but same can be easily performed on real devices like battery status, phone calls, messaging, memory card checks etc. This is the reason why you should go on testing with real devices instead of emulators.
Answer: On Google Play, there are multiple tools that help you with effective memory utilization and improved CPU usage. You can also use Systrace feature within Android IDE for the same purpose.
Answer: The effective android testing strategy should pass through following tests – Unit testing, Integration testing, Operational testing, system testing etc.
Answer: This is an advanced testing mechanism that directly executes test cases on JVM without any need of real devices or emulators.
Answer: Manual testing should be used for simpler test cases when an application needs to be tested once or twice only. At the same time, Automation testing can be performed for complex scenarios too where regression testing is the primary requirement.
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