More and more apps are being made for the Android platform. But what does it take to become an efficient Android developer? You need to learn and master the tips to ace android interview questions.
Even though both iOS and Android developers are in high demand, companies are looking for iOS developers much more quickly. Even in the last three months of 2017, Android was still the most popular mobile operating system. It had almost 71% of the market, while iOS only had about 28%. Based on these numbers, Android application development certifications will remain in high demand for a long time.
The need for Android developers is going through the roof, so now is a great time to start a career in this field. This post has questions and answers about Android for the most common job interviews for first-year students and experienced candidates. We’ll cover basic, intermediate, and advanced levels of interview questions.
We have compiled it into three sections:
- Questions for Freshers with 1-2 years of experience
- Questions for candidates with 3 to 5 years of experience
- Questions for 7-10 years of experience level with Android
Let’s get started with some basic Android-related interview questions for beginners.
Android Interview Questions for Freshers and 1-2 Years Experience
Q. What do you mean by Android?
Android is a free and open-source operating system mainly developed for mobile devices. It uses the Linux kernel as its foundation. Users have access to a platform where they can use a lot of different kinds of software. Applications like this are available for download from the Google Play Store and elsewhere. Android is a flexible operating system that can be put on various hardware and screens.
Q. What is the purpose of Android?
For the following reasons, Android is essential:
- It’s an all-pervasive system that facilitates access to a wide range of programs and services.
- It’s free and available to anyone who wants to use it. Developers are free to alter and disseminate it as they see fit.
- It’s compatible with everything from entry-level cell phones to high-end tablets.
- It can be altered to suit your needs. Users can change the system’s appearance, add new features, and use different operating systems.
Q. What are some of Android’s essential functions?
The most important aspects of Android are as follows:
- Consistent alerting system
- Safety of the Google Play Store
- The modularity of Google’s Service
Q. With Android, what exactly is a layout, and how wide are the distinct varieties?
In Android, a layout is a group of UI elements. Buttons, text fields, pictures, and other widgets are all examples of UI controls. The format specifies the relative placement and relative sizes of certain UI elements. It lays the groundwork for an Android app’s graphical user interface.
Android supports a variety of layouts, including:
We can use linear layout, relative layout, constraint layout, frame layout, and table layout to set up our pages.
Q. What is an Android application package, or APK?
“APK” stands for “Android Package Kit,” a file format used to install and distribute Android apps. Everything needed to get an Android app up and running on a device is included. It includes the manifest file, resources, assets, and compiled code.
Q. What is the Android context?
In Android, “context” is an abstract class. In this class, you can gain entry into data and services that are unique to your app. It’s a symbol of where the process is at the moment. As a bonus, it gives information about the ecosystem around it, the available assets, and other system-level features.
Android Interview Questions for Candidates with 3 to 5 Years of Experience
Q. Exactly what does “Armv7” stand for?
Android supports three different kinds of central processing unit designs. The ARMv7 architecture is the standard because it minimizes power drain. The ARM64 architecture is an improved version of the original. It supports 64-bit processing, which makes it possible to do more complicated calculations. The least popular of the three is ARMx86 because it drains batteries too quickly. It has greater strength than the other two.
Q. What does the term “application” entail?
All other classes, such as program activities and services, are subclasses of the Application class, which serves as the main entry point for an Android. When creating a process for your application or package, the Application class or a subclass of the Application class is instantiated first.
Q. Why does Android not support running bytecode?
Android likes the DVM (Dalvik Virtual Machine) better than the JVM (Java Virtual Machine) for virtual machines.
Q. In Gradle, what exactly is a BuildType? Where does it find its practical application?
Gradle uses the properties set by build types when building and distributing your Android app.
The build type of a module tells you how it is built, including whether or not ProGuard is run.
The product flavor tells us what is made, such as which resources are included in the build.
Gradle makes a new build variation for your project for every possible combination of product flavors and build types.
Q. Describe in detail the steps involved in an Android build:
The first thing to do is use the AAPT (Android Asset Packaging Tool) to compile the /res folder. They are combined into a single R.java class file. Simply put, this is a constant-only class.
The second stage is for the Java source code to be built into.class files using Javac, and then for the “dx” tool, found in the SDK’s “tools,” to convert the class files to Dalvik bytecode. The generated file is called a class. Dex.
The Android app builder is then used to put all the data into the final apk (Android packaging key) file.
Q. What is the application architecture for Android?
These parts make up the Android application architecture:
Services It will carry out operational tasks in the background.
With this in mind, it is a conduit for information between processes.
Strings and images are examples of resources that can be externalized.
There are many different types of notifications, including a flashing light, a beeping sound, an icon, a dialogue box, and a toasted
Providers of Content: It will facilitate information sharing among programs.
Android Interview Questions for a 10-Year Experience Level
Q. The Android platform has four Java classes for working with sensors. Identify and describe their functions.
Q. Exactly what does one do with a content provider—or what does it do, anyway?
Q. Under what circumstances would the code cause an application crash? What changes would you make to the code to safeguard against this issue? Justify your choice.
Q. When the screen is rotated, the Android platform usually deletes the current activity and starts over from scratch. This resets all view values in the activity’s layout. Share your views on this.
Q. You discover that the value of a view is not being restored when the screen is rotated in your app. With that point of view, what are the most plausible hypotheses for the problem, and what should you check to rule them out?
Q. OnDestroy is the last callback ever used in the activity lifecycle model. The system calls this function on your activity as a final warning before permanently deleting it. Before invoking onDestroy, the system often calls onPause() and onStop(). Nevertheless, please explain why onPause() and onStop() would never be called in your code.
Q. Consider the example of initiating a service within an activity:
What problem could you run into, and how could you fix it if the action displays an animation that signals progress?
Q. How does an async task’s life cycle compare to an activity’s? What sort of issues might this trigger? Exactly how does one keep these issues from occurring?
In this age of technology, there is a lot of demand for Android application developers, and the job is also one of the best paid.
Because of this, many smart people want to work in this field. Multinational corporations (MNCs) and even smaller businesses ask difficult interview questions. This will help you a lot.
If you study these questions carefully, you should be able to do well in any interview for an Android developer job. For more such posts, visit educationnest.com right away!