Top Answers to Android Interview Questions
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Although both Android and iOS Developers are in high demand, there is more requirement for Android Developers in the market. It is the most commonly used operating system in the world today. So, if you are looking to pursue a career in the field of Android, then these Android interview questions will be extremely helpful for you. Check out a few of the most important interview questions in the Android field:
The Android interview questions are grouped under the following three categories: 1. Basic
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Can Android applications only be programmed in Java?
No, not necessarily. We can program Android apps using the Native Development Kit (NDK) in C/C++. The NDK is a toolset that allows us to implement parts of our app using native code languages such as C and C++. Typically, good use cases for NDK are CPU-intensive applications such as game engines, signal processing, and physics simulation.
1 What is a Handler typically used for?
You use Handler to communicate between threads, most commonly to pass an action from a background thread to Android’s main thread.
This question allows you to check that the developer understands another fundamental concept of multithreading in Android: you cannot update the UI from any thread other that the main thread.
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1: For starters, whatâs Android anyway?Â
Android is a Linux-based, open-sourced operating system commonly found on mobile devices, such as smartphones and tablets. Itâs a kernel-based system that gives developers the flexibility to design and deploy simple and/or advanced apps.
When should you use a Fragment, rather than an Activity?
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. The old Activity has to be destroyed, paused or stopped, and a new Activity has to be created. The developer should acknowledge that the best practice is to only use Activities when you need to swap the entire screen, and use fragments everywhere else.
Bonus points if the Android developer mentions any of the following use cases, where you’ll almost always use a Fragment, rather than an Activity:
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2: What is the current version of Android, and how old is it?
The current version of Android is 9.0, also called Android Pie, and it came out in August of 2018.
27: How do you place layouts in Android? Where are they placed?
Theyâre placed as XML files, in the layout folder.
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What are the different storage methods in Android?
Android offers several different options for data persistence. Shared Preferences – Store private primitive data in key-value pairs. This sometimes gets limited as it offers only key-value pairs. You cannot save your own java types. Internal Storage – Store private data on the device memory.