Question 1

Describe Android Application Architecture.

Accepted Answer

Android Application Architecture has the following components: > Services - like Network Operation > Intent - To perform inter-communication between activities or services > Resource Externalization - such as strings and graphics > Notification signaling users - light, sound, icon, notification, dialog etc > Content Providers - They share data between applications

Question 2

How to select more than one option from list in android xml file? Give an example.

Accepted Answer

Specify android id, layout height and width as depicted in the following example

Question 3

Why cannot you run standard Java bytecode on Android?

Accepted Answer

Android uses Dalvik Virtual Machine (DVM) which requires a special bytecode We need to convert Java class files into Dalvik Executable files using an Android tool called "dx" In normal circumstances, developers will not be using this tool directly and build tools will care for the generation of DVM compatible files

Question 4

How does an application run in isolation from other applications?

Accepted Answer

Each application gets its own Linux user ID and virtual machine which means that the application code runs in isolation from other applications

Question 5

Write code snippet to retrieve IMEI number of Android phone?

Accepted Answer

TelephonyManager class can be used to get the IMEI number It provides access to information about the telephony services on the device Code TelephonyManager mTelephonyMgr = (TelephonyManager) getSystemService(ContextTELEPHONY_SERVICE); String imei = mTelephonyMgrgetDeviceId();

Question 6

How can your application perform actions that are provided by other application e.g. sending email?

Accepted Answer

Intents are created to define an action that we want to perform and the launches the appropriate activity from another application Code Intent intent = new Intent(IntentACTION_SEND); intentputExtra(IntentEXTRA_EMAIL, recipientArray); startActivity(intent);

Question 7

How will you launch an Activity within you application?

Accepted Answer

For launching an application, we will need to create an intent that explicitly defines the activity that we wish to start For example: Code Intent intent = new Intent(this, MyTestActivityclass); startActivity(intent);

Question 8

Whats a struct?

Accepted Answer

A struct is a special C data type that encapsulates other pieces of data into a single cohesive unit Like an object, but built into C

Question 9

Whats the difference between a NSArray and a NSMutableArray?

Accepted Answer

A NSArray’s contents can not be modified once it’s been created whereas a NSMutableArray can be modified as needed, ie items can be added/removed from it

Question 10

If I call performSelector:withObject:afterDelay: – is the object retained?

Accepted Answer

Yes the object is retained It creates a timer that calls a selector on the current threads run loop It may not be 100% precise time-wise as it attempts to dequeue the message from the run loop and perform the selector

Question 11

Explain the correct way to manage Outlets memory?

Accepted Answer

Create them as properties in the header that are retained In the viewDidUnload set the outlets to nil(ie selfoutlet = nil) Finally in dealloc make sure to release the outlet

Question 12

Where can you test Apple iPhone apps if you don’t have the device?

Accepted Answer

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

Question 13

Which API is used to write test scripts that help in exercising the application's user interface elements?

Accepted Answer

UI Automation API is used to automate test procedures Tests scripts are written in JavaScript to the UI Automation API This in turn simulates user interaction with the application and returns log information to the host computer

Question 14

Assume that your app is running in the foreground but is currently not receiving events. In which sate it would be in?

Accepted Answer

An app will be in InActive state if it is running in the foreground but is currently not receiving events An app stays in InActive state only briefly as it transitions to a different state

Question 15

What are layer objects and what do they represent?

Accepted Answer

Layer objects are data objects which represent visual content Layer objects are used by views to render their content Custom layer objects can also be added to the interface to implement complex animations and other types of sophisticated visual effects

Question 16

What is SVG?

Accepted Answer

SVG stands for scalable vector graphics It’s a text based graphic language which draws images using text, lines, dots etc This makes it lightweight and renders faster

Question 17

What is local storage concept in HTML 5?

Accepted Answer

Many times we would like to store information about the user locally in the computer For example let’s say user has half-filled a long form and suddenly the internet connection breaks off So the user would like you to store this information locally and when the internet comes backHe would like to get that information and send it to the server for storage Modern browsers have storage called as “Local storage” in which you can store this information

Question 18

What are meta tags used for?

Accepted Answer

-To store information usually relevant to browsers and search engines -To only store information usually relevant to browsers -To only store information about search engines -To store information about external links

Question 19

How would you automatically transfer your visitors to a new web page?

Accepted Answer

- You can do it with the help of meta tag mentioned below: Place this tag between - It will load yousitecom in 2 seconds

Question 20

You want only a vertical scrollbar and no horizontal scrollbar on your page. How would you do it?

Accepted Answer

- This can be done by defining the frame with SCROLLING = auto and having content to just fit into this frame - SCROLLING="yes" gets the scroll bar on both the sides, even when not needed - SCROLLING="no" doesn’t get the scrollbars at all, even when they are needed

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