Mobile Apps Developer Interview Questions And Answers

A follow-up to the previous question, there are a number of possible answers here. What you want to hear is that you want as little work done as possible on the main thread, also known as the "UI thread".

Since that is the core single thread that your application runs on, you would want to keep activities that require more complex computations or network and database connections, for example, on separate worker threads so as not to slow down the main thread.

An app is said to be in 'not running' state when:

☛ It is not launched.
☛ It gets terminated by the system during running.

The UIKit framework is used to develop application's user interface for iOS. UIKit framework provides event handling, drawing model, windows, views, and controls specifically designed for a touch screen interface.

Also referred to simply as Widgets, App Widgets in the Android world are miniature views that are embedded within Android apps and typically display periodic updates. Music players, weather updates, sports scores, and stock price changes are all examples of data that can be displayed in an App Widget.

Pick the platform you want to develop on wisely; focus only on one or two platforms in the beginning; and start simple. Focus on core functionality first and add features in subsequent versions as you gain insight and experience.

We have created a single unified architecture that covers all platforms, so that we can ensure a common user experience across devices. However, different platforms utilise different operating systems and system tools, so we have to create a unique client code base for each platform - iOS, Android, and Blackberry. It is possible to reuse some code across Blackberry and Android.

☛ JDK
☛ Eclipse + ADT plugin
☛ SDK Tools.

☛ Andy Rubin
☛ Rich Miner
☛ Nick Sears

ANR stands for "Application Not Responding". It's a dialog box that appears when an application doesn't respond for more than 10 seconds (sometimes it can be less than 10 seconds). The ANR dialog box offers the user the option of either closing the app or waiting for it to finish running.

An app is said to be in active state when it is running in foreground and is receiving events.

iOS Simulator can be used to test mobile applications. Xcode tool that comes along with iOS SDK includes Xcode IDE as well as the iOS Simulator. Xcode also includes all required tools and frameworks for building iOS apps. However, it is strongly recommended to test the app on the real device before publishing it.

'manifest' Note: The 'permissions' element is the next best answer if the developer assumed you meant the first element within the 'manifest' structure.

The important ones are flexibility, speed, and a keen understanding of the user experience. Mobile development jobs require you to work quickly and be ready to respond to lots of changes, such as hardware and software updates, patches and design changes. The tablet is a great example - we have entered into a 'post PC era' and the types of things that a tablet will be used for is still evolving.

On state transitions can be responded to state changes in an appropriate way by calling corresponding methods on app's delegate object.

Example:
☛ applicationDidBecomeActive method can be used to prepare to run as the foreground app.
☛ applicationDidEnterBackground method can be used to execute some code when app is running in the background and may be suspended at any time.
☛ applicationWillEnterForeground method can be used to execute some code when your app is moving out of the background
☛ applicationWillTerminate method is called when your app is being terminated.

SBJson framework is supported by iOS. It is a JSON parser and generator for Objective-C. SBJson provides flexible APIs and additional control that makes JSON handling easier.

☛ src:
This contains the .java source files for your project.

☛ gen:
contains the .R file, a compiler-generated file that references all the resources found in your project. You should not modify this file.

☛ bin:
contains the Android package files .apk built by the ADT during the build process and everything else needed to run an Android application.

☛ res/drawable-hdpi
This is a directory for drawable objects that are designed for high-density screens.

☛ res/layout
This is a directory for files that define your app's user interface.

☛ res/values
This is a directory for other various XML files that contain a collection of resources, such as strings and colors definitions.

☛ AndroidManifest.xml
This is the manifest file which describes the fundamental characteristics of the app and defines each of its components.

☛ Google now (voice assistant)
☛ NFC (Near Field Communication)
☛ Unlock your phone by your face
☛ Use your phone with joystick to enjoy gaming experience
☛ Connect your phone with LED TV via MHL or micro HDMI cable
☛ Screen Capture
☛ Multitasking Future (Task Switcher)
☛ Data Usages (Check and also set limit from device)

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

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

startActivity(i);

☛ Most of us are aware of features like
☛ Live wallpaper
☛ Camera
☛ Messaging
☛ Bluetooth
☛ WIFI
☛ Web Browsing
☛ Music
☛ Alarm etc. etc…

Scoping starts with a long, hard look at the device. Mobile devices offer different form factors, screen size and resolution, computing power and functionality. They run different operating systems and have other methods of retrieving data such as wifi or 3G.

The challenge is to understand the device and how it will be used to the best advantage: focus on the benefits of the device, such as size and portability, and ensure that the user experience will be optimised.

These are code names for Android releases, and are well known throughout the Android community. Your developer should be familiar with them. Ice Cream Sandwich was Android version 4.0 (API level 14) released on October 18, 2011. KitKat refers to Android version 4.4 (API level 19), released on October 31, 2013.

This question is really to weed out the beginners who may not be as familiar with the different Android releases and that changes within each. You really want your developer to be in tuned to the Android updates so they know what's possible, how to best implement what you are asking, and where things are headed in general.

Platform fragmentation is the biggest, the need to develop and maintain separate apps on each of the different platforms.

Others include: varying levels of maturity of software developer kit and technical documentation; different user interface guidelines; different specs for processor and RAM; differences between mobile platforms in terms of how security is handled, multi-tasking is supported, and content is rendered.

☛ Open-source
☛ Platform-independent
☛ Supports various technologies (having number of native application like: camera, bluetooth, wifi, speech, EDGE)

It means a robot with a human appearance.

Software Development Kit.