{"id":25514654,"date":"2022-03-08T21:37:25","date_gmt":"2022-03-08T16:07:25","guid":{"rendered":"https:\/\/entri.app\/blog\/?p=25514654"},"modified":"2022-03-08T21:37:25","modified_gmt":"2022-03-08T16:07:25","slug":"essential-interview-questions-and-answers-for-android-developers","status":"publish","type":"post","link":"https:\/\/entri.app\/blog\/essential-interview-questions-and-answers-for-android-developers\/","title":{"rendered":"Essential Interview Questions and Answers for Android Developers"},"content":{"rendered":"<p>Technology has become an inevitable part of our everyday life. The advancement in the field of technology has helped humans to achieve many things that were once considered impossible. Android is one of the most important mobile operating systems these days. Job scopes in this category are also increasing day by day. Here in this article is the essential interview questions that the Android developers must be familiar with during a technical interview. As the aspirants who are preparing for the interview are requested to go through the complete article to get familiarised with the questions.<\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/entri.sng.link\/Bcofz\/uu8c\/w409\" target=\"_blank\" rel=\"noopener\"><strong>Download Entri App! Start your Android development interview preparations now!<\/strong><\/a><\/p>\n<h2><strong>Interview Questions and Answers for Android Developers<\/strong><\/h2>\n<p>The given below are some of the most important interview questions that ath candidates need to understand and be familiarised with for the interview that is related to Android development.<\/p>\n<section id=\"what-is-android\" class=\"ibpage-article-header\">\n<h4><strong>What is Android?<\/strong><\/h4>\n<article class=\"ibpage-article\">Android is an open-sourced operating system that is used on mobile devices, such as mobiles and tablets. The Android application executes within its own process and its own instance of Dalvik Virtual Machine(DVM) or Android RunTime(ART).<\/p>\n<\/article>\n<\/section>\n<h4><strong>What are the Components of the Android application?<\/strong><\/h4>\n<p>Android application architecture has the list of components given below. They are as follows:<\/p>\n<ul>\n<li>Services \u2212 It will be used to perform background functionalities.<\/li>\n<li>Activities &#8211; It is a single screen that represents GUI(Graphical User Interface) with which users can interact in order to do something like dial the phone, view email, etc.<\/li>\n<li>Broadcast receivers &#8211; Broadcast receiver is a mechanism used for listening to system-level events like listening for incoming calls, SMS, etc. by the host application.<\/li>\n<li>Content providers \u2212 This will share the data between various applications.<\/li>\n<\/ul>\n<h4><strong>What are the features of Android architecture?<\/strong><\/h4>\n<article class=\"ibpage-article\">Android architecture refers to the various layers in the Android stack. It consists of operating systems, middleware, and applications. Each layer in the Android architecture gives different services to the layer just above it.<\/p>\n<p>The five layers present in the Android stack are:<\/p>\n<ul>\n<li>Linux Kernel &#8211; It is responsible for device drivers, device management, memory management, power management, and resource access.<\/li>\n<li>Libraries &#8211; There are a set of libraries having open-source Web browser engine WebKit, well known library libc, libraries to play and record audio and video, SQLite database for sharing of application data and storage, SSL libraries for internet security, etc.<\/li>\n<li>Android Runtime &#8211; There are core libraries along with DVM (Dalvik Virtual Machine) or ART(Android RunTime) as runtime which is helpful for running an Android application. DVM is optimized for mobile devices. DVM provides fast performance and consumes less memory. Replacing DVM, ART(Android RunTime) virtual machine was introduced to execute android apps from Android lollipop 5.0 version (API level 21).<\/li>\n<li>Android Framework &#8211; It consists of Android APIs like UI (User Interface), resources, content providers (data), locations, telephony, and package managers. It provides interfaces and classes for the development of Android applications.<\/li>\n<li>Android Applications &#8211; Applications like home, games, contacts, settings, browsers, etc. use the Android framework that will make use of Android runtime and libraries.<\/li>\n<\/ul>\n<p style=\"text-align: center;\"><a href=\"https:\/\/entri.sng.link\/Bcofz\/uu8c\/w409\" target=\"_blank\" rel=\"noopener\"><strong>Sign Up for Entri App now!<\/strong><\/a><\/p>\n<h4 id=\"6_name_the_basic_tools_for_developing_an_android_app\"><strong>Name some basic tools for developing an Android App<\/strong><\/h4>\n<p>The tools used for development are:<\/p>\n<ul>\n<li>JDK<\/li>\n<li>SDK Tools<\/li>\n<li>Eclipse+ADT Plugin<\/li>\n<\/ul>\n<h4><strong>What are the languages used to build Android?<\/strong><\/h4>\n<article class=\"ibpage-article\">The most popular programming languages that can be used to develop applications in Android are:<\/p>\n<ul>\n<li>Java: It has always been a starting point for new developers and is used by the majority of people who work with Android development. Eclipse, NetBeans, and IntelliJ IDE are the most popular IDE\u2019s(Integrated Development Environment) used for developing an Android application using java.<\/li>\n<li>Kotlin: Kotlin is a relatively new, modern, safe, and object-oriented cross-platform programming language used in developing an Android application. IDE\u2019s used with kotlin are Android studio, Eclipse IDE, etc.<\/li>\n<li>C#: Developers can build native iOS and Android mobile applications by using the C# language. Visual Studio is the best tool for developing an Android application using C#.<\/li>\n<li>Python: It is a dynamic and object-oriented programming language. It is very popular in machine learning. Pydroid 3, Dcoder, spck code editor is some of the code editors for Python.<\/li>\n<li>Other languages which can be used in Android development are C++, HTML 5. C4droid, CppDroid, AIDE, etc. are IDE\u2019s for C++. Acode, spck code editor, etc. are examples of IDE\u2019s used with HTML.<\/li>\n<\/ul>\n<p style=\"text-align: center;\"><a href=\"https:\/\/entri.sng.link\/Bcofz\/uu8c\/w409\" target=\"_blank\" rel=\"noopener\"><strong>Click here to get Android development interview questions pdf!<\/strong><\/a><\/p>\n<h4 id=\"8_explain_the_android_sdk\"><strong>What is Android SDK?<\/strong><\/h4>\n<p>This is a set of tools that Android developers use in order to develop or write apps. It features a graphical user interface that emulates a handheld, Android-driven environment, making it easier for developers to create, test, and debug their code.<\/p>\n<p>The tools include:<\/p>\n<ul>\n<li>Dalvik Debug Monitoring Services<\/li>\n<li>Android Emulator<\/li>\n<li>Android Asset Packaging Tool<\/li>\n<li>Android Debug Bridge<\/li>\n<\/ul>\n<h4 id=\"11_whats_an_android_framework\"><strong>What is an Android framework?<\/strong><\/h4>\n<p>It\u2019s a set of APIs that permits developers to create apps, and consists of:<\/p>\n<ul>\n<li>Intent<\/li>\n<li>Activities<\/li>\n<li>Content Providers<\/li>\n<li>Others<\/li>\n<\/ul>\n<section id=\"adapter-in-android\" class=\"ibpage-article-header\">\n<h4><strong>What is an Adapter in Android?<\/strong><\/h4>\n<article class=\"ibpage-article\">An adapter in Android acts as a bridge between an AdapterView and the underlying data for that view. The adapter holds the data and sends the data to the adapter view, the view can take the data from the adapter view and shows the data on different views like a spinner, list view, grid view, etc.<\/p>\n<\/article>\n<\/section>\n<section id=\"what-is-aapt\" class=\"ibpage-article-header\">\n<h4><strong>What is AAPT?<\/strong><\/h4>\n<article class=\"ibpage-article\">AAPT stands for Android Asset Packaging Tool. It is a build tool that gives the ability to developers to view, create, and update ZIP-compatible archives (zip, jar, and apk). It parses, indexes, and compiles the resources into a binary format that is optimized for the platform of Android.<\/p>\n<\/article>\n<\/section>\n<section id=\"portable-wifi-hotspot\" class=\"ibpage-article-header\">\n<h4><strong>What is a portable Wi-Fi hotspot?<\/strong><\/h4>\n<article class=\"ibpage-article\">Portable Wi-Fi Hotspot permits you to share your mobile internet connection with other wireless devices. For example, using your Android phone as a Wi-Fi hotspot, you can use your laptop to connect to the internet using that access point.<\/p>\n<\/article>\n<\/section>\n<section id=\"android-debug-bridge\" class=\"ibpage-article-header\">\n<h4><strong>What is Android Debug Bridge(ADB)?<\/strong><\/h4>\n<article class=\"ibpage-article\">Android Debug Bridge is a command-line tool used to allow and control communication with an emulator instance. It gives the power for developers to execute remote shell commands to run applications on an emulator.<\/p>\n<\/article>\n<\/section>\n<section id=\"what-is-ddms\" class=\"ibpage-article-header\">\n<h4><strong>What is DDMS?<\/strong><\/h4>\n<article class=\"ibpage-article\">DDMS(Dalvik Debug Monitor Server) is a debugging tool in the Android platform. It gives the following list of debugging features:<\/p>\n<ul>\n<li>Port forwarding services.<\/li>\n<li>Thread and heap information.<\/li>\n<li>Logcat.<\/li>\n<li>Screen capture on the device.<\/li>\n<li>Network traffic tracking.<\/li>\n<li>Incoming call and SMS spoofing.<\/li>\n<li>Location data spoofing.<\/li>\n<\/ul>\n<p style=\"text-align: center;\"><a href=\"https:\/\/entri.sng.link\/Bcofz\/uu8c\/w409\" target=\"_blank\" rel=\"noopener\"><strong>Sign up for Android development courses from Entri App now!<\/strong><\/a><\/p>\n<section id=\"sensors-in-android\" class=\"ibpage-article-header\">\n<h4><strong>Give an explanation about the Sensors in Android<\/strong><\/h4>\n<article class=\"ibpage-article\">Android-based devices have a collection of built-in sensors in them, which measure certain parameters like motion, orientation, and many more through their high accuracy. The sensors can be both hardware and software based on nature. There are three prominent categories of sensors in Android devices. They are:<\/p>\n<ul>\n<li>Position Sensor: It is used for measuring the physical position of the Android device. This has orientation sensors and magnetometers.<\/li>\n<li>Motion Sensors: These sensors consist of gravity, rotational activity, and acceleration sensors which measure the rotation of the device or the acceleration, etc.<\/li>\n<li>Environmental Sensor: It includes sensors that measure temperature, humidity, pressure, and other environmental factors.<\/li>\n<\/ul>\n<\/article>\n<\/section>\n<section id=\"boxes-supported-on-android\" class=\"ibpage-article-header\">\n<h4><strong>What are the dialog boxes supported on Android?<\/strong><\/h4>\n<article class=\"ibpage-article\">Android supports four dialog boxes. They are:<\/p>\n<ul>\n<li>AlertDialog:\n<ul>\n<li>The AlertDialog supports 0-3 buttons, along with a list of selectable items such as checkboxes and radio buttons.<\/li>\n<li>It is used when you want to ask the user about taking a decision between yes or no in response to any particular action taken by the user, by remaining in the same activity and without changing the screen.<\/li>\n<\/ul>\n<\/li>\n<li>DatePickerDialog:\n<ul>\n<li>It is used for selecting the date by the user.<\/li>\n<\/ul>\n<\/li>\n<li>TimePickerDialog:\n<ul>\n<li>Used for selecting the time by the user.<\/li>\n<\/ul>\n<\/li>\n<li>ProgressDialog:\n<ul>\n<li>It is an extension of the AlertDialog and is used to display a progress bar. It also supports the addition of buttons.<\/li>\n<li>This class was deprecated in API level 26 because it prevents the user from interacting with the application. Instead of this class, we can use a progress indicator such as ProgressBar, which can be embedded in the user interface of your application.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/article>\n<\/section>\n<section id=\"android-manifest\" class=\"ibpage-article-header\">\n<h4><strong>What is AndroidManifest.xml file and why do you need this?<\/strong><\/h4>\n<article class=\"ibpage-article\">\n<ul>\n<li>The AndroidManifest.xml file contains information regarding the application that the Android system must know before the codes can be executed.<\/li>\n<li>This file is essential in every Android application.<\/li>\n<li>It is declared in the root directory.<\/li>\n<li>This file performs several tasks such as:\n<ul>\n<li>Providing a unique name to the java package.<\/li>\n<li>Describe various components of the application such as activity, services, and many more.<\/li>\n<li>Defining the classes which will implement these components.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p style=\"text-align: center;\"><a href=\"https:\/\/entri.sng.link\/Bcofz\/uu8c\/w409\" target=\"_blank\" rel=\"noopener\"><strong>Sign Up for Entri App now!<\/strong><\/a><\/p>\n<\/article>\n<\/section>\n<\/article>\n<\/section>\n<\/article>\n<\/article>\n<p>Candidates who wish to apply for the examination are requested to go through the complete syllabus and use the best materials for their preparation. Start your preparations for your dream government job with\u00a0<a href=\"https:\/\/entri.sng.link\/Bcofz\/uker\/hlil\"><strong>Entri App<\/strong><\/a>. We provide a wide range of courses over different government exams. Sign Up for Entri classes and ace the preparation for the government job examinations and bank examinations today itself. Entri helps you with thousands of questions. Attempt mock tests, analyze yourself and improve your success rate. We wish you all the success in your preparations.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Technology has become an inevitable part of our everyday life. The advancement in the field of technology has helped humans to achieve many things that were once considered impossible. Android is one of the most important mobile operating systems these days. Job scopes in this category are also increasing day by day. Here in this [&hellip;]<\/p>\n","protected":false},"author":68,"featured_media":25514655,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[802,1903,1841,1881],"tags":[],"class_list":["post-25514654","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articles","category-coding","category-entri-skilling","category-web-android-development"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Essential Interview Questions and Answers for Android Developers - Entri Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/entri.app\/blog\/essential-interview-questions-and-answers-for-android-developers\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Essential Interview Questions and Answers for Android Developers - Entri Blog\" \/>\n<meta property=\"og:description\" content=\"Technology has become an inevitable part of our everyday life. 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