Top 100+ Mobile Developer Interview Questions And Answers

Question 1. Described Anr?

Answer :

ANR stands for "Application Not Responding". It's a conversation field that looks when an application doesn't respond for extra than 10 seconds (once in a while it may be less than 10 seconds). The ANR conversation container offers the consumer the option of either remaining the app or expecting it to finish walking.

Question 2. How To Avoid An Anr?

Answer :

A follow-as much as the previous query, there are a number of viable solutions here. What you want to hear is that you want as little work finished as feasible on the principle thread, also known as the "UI thread".

Since that is the center single thread that your utility runs on, you will want to preserve sports that require greater complex computations or community and database connections, as an example, on separate employee threads so as not to slow down the primary thread.

C++ Interview Questions
Question 3. How The Mobile Applications Scoped And Specified?

Answer :

Scoping begins with a protracted, hard examine the device. Mobile gadgets offer distinct shape factors, screen length and backbone, computing energy and capability. They run extraordinary running structures and produce other strategies of retrieving records consisting of wifi or 3G.

The venture is to recognize the tool and the way it will likely be used to the first-class gain: focus on the blessings of the device, which include length and portability, and make sure that the consumer revel in will be optimised.

Question 4. Which Information Do You Need Before You Begin Coding An Android App For A Client?

Answer :

You want to find out that this person will are searching for to actually recognize what you are trying to perform with your app, and the capability.

The following objects are exact to hear:

Objective announcement or reason of the app for the app writer
Description of the target market or person demographics
Any present apps that it is probably just like
Wireframes
Artwork; The best builders will say they require the art work to be finished earlier than improvement. This avoids delays, and facilitates the developer understand the appearance, sense and branding you are trying to obtain.
C++ Tutorial
Question 5. How To Respond To State Transitions On Your App?

Answer :

On nation transitions can be responded to nation modifications in an appropriate way via calling corresponding methods on app's delegate item.

Example: 

applicationDidBecomeActive method can be used to put together to run because the foreground app. 
ApplicationDidEnterBackground method can be used to execute some code whilst app is walking in the history and can be suspended at any time. 
ApplicationWillEnterForeground approach can be used to execute a few code when your app is moving out of the heritage 
applicationWillTerminate approach is referred to as whilst your app is being terminated.
Core Java Interview Questions
Question 6. When We Say That An App Is In Active State?

Answer :

An app is stated to be in lively state while it's miles going for walks in foreground and is receiving occasions.

Question 7. Described Scenarios When An Application Goes Into Inactive State?

Answer :

An app can get into InActive kingdom while the person locks the screen or the system prompts the consumer to respond to some event e.G. SMS message, incoming name and so on.

Core Java Tutorial IPHONE APPS Interview Questions
Question eight. Tell Me When An App Is Said To Be In Not Running State?

Answer :

An app is said to be in 'no longer going for walks' country when: 

It is not launched. 
It receives terminated via the gadget during jogging.
Question nine. Which Framework Is Deliver Event To Custom Object?

Answer :

The UIKit infrastructure takes care of turning in events to custom items. As an app developer, you need to override methods in the appropriate gadgets to method the ones occasions.

Android Interview Questions
Question 10. How An Operating System Improve Battery Life While Running An App?

Answer :

An app is notified on every occasion the operating machine actions the apps among foreground and historical past. The operating device improves battery lifestyles while it bounds what your app can do inside the historical past. This additionally improves the person experience with foreground app.

IPHONE APPS Tutorial
Question 11. When Running In Foreground Than In Background Why An App On Ios Device Behaves Differently?

Answer :

An utility behaves in a different way whilst running in foreground than in history because of the difficulty of assets on iOS devices.

Mobile Plant Operator Interview Questions
Question 12. Which Api Is Used To Write Test Scripts?

Answer :

UI Automation API is used to automate take a look at procedures. Tests scripts are written in JavaScript to the UI Automation API. This in turn simulates user interaction with the software and returns log information to the host computer.

C++ Interview Questions
Question 13. Tell Me The Name Of That Application Thread From Where Uikit Classes Should Be Used?

Answer :

UIKit lessons ought to be used most effective from an application's principal thread. Note: The derived instructions of UIResponder and the classes which manage software's person interface must be used from utility's fundamental thread.

Android Tutorial
Question 14. Which Framework Is Used To Construct Application's User Interface For Ios?

Answer :

The UIKit framework is used to increase software's user interface for iOS. UIKit framework gives event coping with, drawing version, home windows, views, and controls in particular designed for a hint display screen interface.

Question 15. Which Tools Required To Develop Ios Applications?

Answer :

iOS improvement requires Intel-based Macintosh laptop and iOS SDK.

Selenium Interview Questions
Question 16. Tell Me Which Json Framework Is Supported By Ios?

Answer :

SBJson framework is supported by using iOS. It is a JSON parser and generator for Objective-C. SBJson presents bendy APIs and further manage that makes JSON handling less complicated.

Selenium Tutorial
Question 17. Tell Me Does Ios Support Multitasking?

Answer :

iOS 4 and above supports multi-tasking and permits apps to remain within the background till they're launched once more or until they're terminated.

IOS Interview Questions
Question 18. Where Test Apple Iphone Apps If Don't Have The Device?

Answer :

iOS Simulator may be used to check mobile programs. Xcode device that comes along side iOS SDK consists of Xcode IDE as well as the iOS Simulator. Xcode also consists of all required equipment and frameworks for constructing iOS apps. However, it's far strongly encouraged to test the app on the real device earlier than publishing it.

Core Java Interview Questions
Question 19. Which Data Types Does Aidl Support?

Answer :

AIDL supports charSequence, listing, map, string, and all forms of local java statistics sorts.

IOS Tutorial
Question 20. Explain Folder, File & Description Of Android Apps?

Answer :

src: 

This incorporates the .Java source files on your venture.

Gen: 

carries the .R document, a compiler-generated file that references all the resources found on your task. You need to no longer adjust this report.

Bin: 

includes the Android package deal documents .Apk built via the ADT in the course of the build method and the whole thing else had to run an Android software.

Res/drawable-hdpi

This is a listing for drawable objects that are designed for high-density screens.

Res/format

This is a listing for files that outline your app's consumer interface.

Res/values

This is a directory for different numerous XML files that include a group of sources, along with strings and shades definitions.

AndroidManifest.Xml

This is the manifest file which describes the essential traits of the app and defines each of its components.

Mobile Testing Interview Questions
Question 21. What Is Aidl?

Answer :

Android Interface Definition Language. It gives to outline the purchaser's interface necessities and moreover a provider so as to communicate at same level with the help of inter process communications.

Question 22. Described App Widgets?

Answer :

Also noted actually as Widgets, App Widgets within the Android global are miniature perspectives that are embedded within Android apps and usually show periodic updates. Music players, weather updates, sports activities ratings, and stock fee adjustments are all examples of information that can be displayed in an App Widget.

Mobile Testing Tutorial
Question 23. Which You Like Better, Ice Cream Sandwich Or Kitkat?

Answer :

These are code names for Android releases, and are widely recognized in the course of the Android network. Your developer should be familiar with them. Ice Cream Sandwich turned into Android model 4.Zero (API stage 14) launched on October 18, 2011. KitKat refers to Android model four.4 (API level 19), launched on October 31, 2013.

This query is genuinely to weed out the beginners who won't be as familiar with the one of a kind Android releases and that adjustments inside every. You really want your developer to be in tuned to the Android updates so they recognise what's feasible, how to pleasant implement what you're asking, and in which things are headed in general.

Mobile Device Management Interview Questions
Question 24. Described Containers?

Answer :

Containers holds gadgets and widgets together, depending on which items are needed and in what arrangement they want to be in. Containers can also keep labels, fields, buttons, or even baby boxes, as examples.

IPHONE APPS Interview Questions
Question 25. Which Items Or Folders Are Important In Every Android Project?

Answer :

The developer need to name at the least 4 of these 6 objects under, as these are essential inside every Android project:

AndroidManifest.Xml
construct.Xml
bin/
src/
res/
property/
Mobile computing Tutorial
Question 26. How Android Allows You To Store Data?

Answer :

Any of the following 5 feasible alternatives are desirable:

SharedPreferences
Internal Storage
External Storage
SQLite Database
Network connection
Mobile computing Interview Questions
Question 27. Which Any Other Advice You Have For The App Developer?

Answer :

Pick the platform you need to broaden on wisely; recognition only on one or two systems in the starting; and start easy. Focus on middle functionality first and add functions in next variations as you gain insight and experience.

Android Interview Questions
Question 28. What Is Manifest File And How We Used?

Answer :

Every Android app ought to have this take place report in its root listing named 'AndroidManifest.Xml'. The record includes important information about the app, such as the Java package deal call for the utility.

Mobile Security Tutorial
Question 29. What Is First Element In Androidmanifest File, Right After The Encoding Declaration?

Answer :

'show up' Note: The 'permissions' detail is the following high-quality solution if the developer assumed you supposed the first element in the 'manifest' shape.

Mobile Security Interview Questions
Question 30. What Are The Advance Features Of Android Os?

Answer :

Google now (voice assistant)
NFC (Near Field Communication)
Unlock your phone by means of your face
Use your smartphone with joystick to experience gaming revel in
Connect your smartphone with LED TV through MHL or micro HDMI cable
Screen Capture
Multitasking Future (Task Switcher)
Data Usages (Check and also set limit from device)
Question 31. What Is Intent?

Answer :

An Intent is exactly what it describes. It's an "purpose" to do an action.

An Intent is basically a message to say you probably did or need something to show up. Depending on the rationale, apps or the OS is probably listening for it and could react accordingly.

There are two types of intents in android:

Implicit Intent
Explicit Intent
Mobile Marketing Tutorial
Question 32. Described Tech Challenges?

Answer :

Platform fragmentation is the biggest, the need to increase and preserve separate apps on every of the exclusive systems.

Others encompass: varying tiers of maturity of software developer kit and technical documentation; exceptional user interface guidelines; specific specs for processor and RAM; variations among mobile systems in terms of ways protection is treated, multi-tasking is supported, and content material is rendered.

Advanced C++ Interview Questions
Question 33. What Is Different About The Mobile App Development?

Answer :

Some of the particular demanding situations are: designing for a small display screen length and resolution; energy control that makes a speciality of optimization of battery lifestyles; coping with information access in an environment of variable and potentially inconsistent community get admission to; working with devices that provide constrained processor power and RAM in contrast to a PC.

Mobile Plant Operator Interview Questions
Question 34. How To Port Applications To Multiple Platforms?

Answer :

We have created a single unified architecture that covers all systems, so that we will make certain a commonplace consumer experience throughout gadgets. However, specific structures utilise extraordinary working structures and device equipment, so we have to create a unique consumer code base for each platform - iOS, Android, and Blackberry. It is feasible to reuse some code throughout Blackberry and Android.

Question 35. Which Special Skills And Roles Are Required?

Answer :

The vital ones are flexibility, velocity, and a eager know-how of the user enjoy. Mobile development jobs require you to work quick and be ready to reply to masses of changes, inclusive of hardware and software updates, patches and layout changes. The tablet is a extraordinary instance - we have entered into a 'post PC technology' and the types of matters that a tablet could be used for continues to be evolving.

Question 36. Which Languages Are The Mobile Apps Programmed In?

Answer :

Cisco WebEx develops cell meeting applications for a host of gadgets. The apps are developed inside the programming language best appropriate to the tool and OS we're drawing close. So, we increase the use of C++ for Apple devices jogging on iOS, Java for BlackBerry gadgets, Java for Android gadgets and so on.

Selenium Interview Questions
Question 37. Define Avd?

Answer :

AVD Stand for Android Virtual Device (emulator), The Android SDK includes a cellular device emulator - a digital cell tool that runs on your computer.

Question 38. How To Start Another Activity?

Answer :

Note: you need to beyond this code on onClick method.

Intent i = new Intent(getApplicationContext(), Activity2.Class); 

startActivity(i);

Question 39. Define Android Application Content Providers Components?

Answer :

They cope with facts and database management problems.

Question 40. What Are Activities?

Answer :

An pastime is a unmarried, targeted component that the user can do. When ever consumer click on GUI the next Activity might be begin and new GUI set base on coding.

IOS Interview Questions
Question forty one. Define Android Application Services Components?

Answer :

They handle historical past processing related to an application.

Question forty two. Define Android Application Broadcast Receivers Components?

Answer :

They take care of verbal exchange among Android OS and programs.

Mobile Testing Interview Questions
Question forty three. Define Android Application Activities Components?

Answer :

They dictate the UI and manage the person interplay to the smartphone display screen.

Question forty four. Which Are The Advantages Of Android?

Answer :

Open-supply
Platform-unbiased
Supports numerous technology (having quantity of local application like: digital camera, bluetooth, wifi, speech, EDGE)
Question forty five. Which Language Need To Know To Develop Android Apps?

Answer :

Java
XML
Question 46. Sdk Stands For?

Answer :

Software Development Kit.

Question 47. Adt Stands For?

Answer :

Android Developer Tools.

Question 48. Which Tools Required For Developing Android Apps?

Answer :

JDK
Eclipse + ADT plugin
SDK Tools.
Question 49. What Are The Features Of Android Os?

Answer :

Most people are aware of capabilities like 
Live wallpaper
Camera
Messaging
Bluetooth
WIFI
Web Browsing
Music
Alarm and so forth. And so on….
Question 50. Who Are The Inventors Of Android?

Answer :

Andy Rubin, Rich Miner, Nick Sears.

Question fifty one. What Is Android Mobile?

Answer :

An open-source working machine used for smartphones and pill computer systems.

Question 52. What Is Meaning Of Android?

Answer :

It approach a robot with a human look.