Android is a popular mobile operating system by Google. It is the most commonly used operating system across the world. With great usage and popularity, the demand for Android developers is also on the surge.
The total number of smartphone users across the globe is on the rise every day, and most of them use Android as their operating system. Reports state that Android covers 80% of the smartphone market.
With such numbers, the Android App Development Course has emerged as the most demanding course in the market today. Freshers or professionals, people are willing to break into a career in Android development, as it guarantees a bright and prosperous future.
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By developing the skills and certifications, you can raise your chances, but the actual way to get into the market is through cracking the interview. To help you prepare for the market, we have compiled a list of android developer interview questions that will help you to ace the Android interviews and start a golden career.
Let’s get started:
Android is an open-source operating system used for mobile devices. It allows developers to create and run outstanding apps with basic and advanced features and functions.
Android keeps itself updated frequently to bring new features to the users. The latest version of Android came out in October 2021, and it is Android 12.0.
Android was founded by Andy Rubin.
The Android architecture is a stack of software components. It is useful in supporting the Android mobile device requirements and is made up of four components:
Android is an extremely popular operating system. It is useful because:
SDK is Software Development Kit. Android SDK serves the purpose of a toolset that helps the developers to write apps for Android devices. The toolset consists of:
The key components used in the android application includes:
Android operating system has many features, some of the major ones are:
Android is a free build on Linux. It is an open platform that offers an inclusive range of software stacks. The demand for Android app development is expanding at a tremendous rate for its robust features, which include:
Developers used Java to develop Android applications. And in 2019, Google announced Kotlin to be the official language for Android. So, Android now supports both the programming languages- Java and Kotlin.
These are some of the android basic interview questions that are frequently asked by companies to assess the knowledge of the interviewee. You should prepare yourself for these basic questions to create a positive impact.
Now, let’s dig deeper and find out some of the android technical interview questions that are asked during an interview.
| Version numbers | Code name | Release date |
|---|---|---|
| 1.0 | No codename | Sep 23, 2008 |
| 1.1 | No codename | Feb 9, 2009 |
| 1.5 | Cupcake | Apr 27, 2009 |
| 1.6 | Donut | Sep 15, 2009 |
| 2.0-2.1 | Eclair | Oct 26, 2009 |
| 2.2-2.2.3 | Froyo | May 20, 2010 |
| 2.3-2.3.7 | Gingerbread | Dec 6, 2010 |
| 3.0-3.2.6 | Honeycomb | Feb 22, 2011 |
| 4.0-4.0.4 | Ice Cream Sandwich | Oct 18, 2011 |
| 4.1-4.3.1 | Jelly Bean | Jul 9, 2012 |
| 4.4-4.4.4 | KitKat | Oct 31, 2013 |
| 5.0-5.1.1 | Lollipop | Nov 12,2014 |
| 6.0-6.0.1 | Marshmallow | Oct 5, 2015 |
| 7.0 | Nougat | Aug 22, 2016 |
| 7.1.0-7.1.2 | Nougat | Oct 4, 2016 |
| 8.0 | Oreo | Aug 21, 2017 |
| 8.1 | Oreo | Dec 5, 2017 |
| 9.0 | Pie | Aug 6, 2018 |
| 10.0 | Android 10 | Sep 3, 2019 |
| 11 | Android 11 | Sep 8, 2020 |
| 12 | Android 12 | Oct 4, 2021 |
Android Runtime or ART is the managed runtime that is used by applications. It is an application runtime environment. ART performs the function of translating the bytecode of the application into a native instruction that is executed by the runtime environment of the device.
Explicit intent lays down the components explicitly. It also passes the target component directly in the intent.
Implicit intent, on the other hand, doesn’t specify the components. It allows the components from other apps to handle the general functions and actions.
AAPT is Android Asset Packaging Tool. It provides the developers with the ability to deal with zip-compatible archives. It allows the developers to create, extract or view the contents of the archives. AAPT is used for compiling the resource files and helps the developers to redesign zip-perfect chronicles.
TTL is Time to Live. It is a value in the data packet of Internet Protocol. TTL is known for communicating to the network router regarding whether the packet should be in the network for long or needs to be discarded.
The purpose of TTL is to specify the transmission of the packet header. It can specify the time limit for the packet within seconds. It communicates with the network router and as the time is exhausted, the packet gets discarded. It also plays an active role in avoiding the wastage of bandwidth.
An activity is referred to the screen representation of an application in Android. It serves the purpose of an entry point for the user’s interaction.
There are two methods:
Users navigate between different screens or apps, so the activity goes through different stages in their lifecycle. An active lifecycle consists of 7 methods of activity:
An intent in Android is the intention to perform an action. It is a messaging object you can use to request an action from a different app component.
A Framework is a vital and core part of Android architecture. It is composed of a set of APIs that allow the developers to pen apps.
An activity is equal to a Frame or Window in GUI toolkits. It is a class that can be stretched in Android to install UI elements.
Class is used by Android to produce an executable apk. It is a compiled form of a Java file.
The File is a lump of information or resources for packing information.
Toast notification in Android is the message that pops up on the window. It doesn’t interfere with the recent or current activity of the users. It only covers the expanse of space needed for a message. The notification fades out automatically.
An Emulator plays the role of a benign place for code testing for the developers, especially in the primary design phase. It allows the developers to move or play around the interface and act as if it’s the real mobile device.
It is the foremost way of creating a new Android project. It is composed of a shell script, which generates a new file system structure required for writing codes.
Activities can be closed or operated anytime according to the wish of the users.
Services, on the other hand, are designed to run behind the scenes and act independently.
The layout particulars are positioned in XML files. With the usage of XML-based layouts, the user can experience a consistency in setting the GUI definition format.
Android Package Kit or APK is the bundle file format used by Android for the circulation and installation of mobile apps and middleware. It is also used to compile applications before uploading them to the Play Store.
The three key loops in monitoring activity include the following:
The tools placed in an Android SDK:
More android app development interview questions for your practice:
Dalvik is Android’s virtual machine. It is an interpreter-only machine that performs files in the Dalvik Executable (.dex) format. The format is well-optimized for efficient storing and memory-mappable performance.
It is a client-server program that gives power to the developers to perform remote shell commands. It is made up of three components- client, daemon and a server.
Yes, it is possible for two android applications to share the same Linux ID and VM. All that is required to be done here is that the applications must sign in with the same certificate. It allows them to share the Linux ID and VM.
It is not recommended to make any change in the name of the application after its deployment. Taking this action may break the functionalities and some shortcuts will also not work.
Orientation in Android dictates if the Linear Layout is represented as a row or a column.
Among the other states of activities, the foreground activity is the most important. It is killed or terminated as a last resort when it is consuming too much memory.
Some mobile phones available in the market gives you the liberty to upgrade to the higher version of the Android operating system. However, it does not guarantee an upgrade to the latest version. It depends on the specifications of the phone and the features that it can support.
A nine-patch image lets resizing for the target device. The nine-patch image denotes to the way one can resize the picture- 4 unscaled corners, 4 one-axis scaled edges, and the middle one is scaled in both axes.
WebView in Android is a view that displays the web pages inside your application. It includes the methods to navigate forward and backwards through a history, zoom in and out and also performs text searches.
Here are some more top android interview questions that might be helpful for you:
Containers are used to hold objects and widgets together. It depends on the specific items and the arrangements that are required.
Broadcast Receivers are used to answer to the broadcast messages sent by other applications.
Android supports the following dialog boxes:
A ContentProvider manages access to a structured set of data. It is a usual interface that connects data to codes running in another process.
Margin is the outer space of an element. Padding is the inner space between content and border.
These are some of the most commonly asked Android developer interview questions for freshers that recruiters ask in an interview. This set of Android interview questions will help you ace your job interview.
We hope these Android questions help you crack the interview and start a perfect career. Always be prepared to answer all types of questions- technical, interpersonal, and other questions. Get your career started in Android development with the right course in the market.
If you want to get trained by professionals on this technology, you must get enrolled in the Android training at Webskitters Academy!
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