Question 1

What are the dialog boxes that are supported in android? Explain.

Accepted Answer

AlertDialog : An alert dialog box supports 0 to 3 buttons and a list of selectable elements, including check boxes and radio buttons Among the other dialog boxes, the most suggested dialog box is the alert dialog box ProgressDialog: This dialog box displays a progress wheel or a progress bar It is an extension of AlertDialog and supports adding buttons DatePickerDialog: This dialog box is used for selecting a date by the user TimePickerDialog: This dialog box is used for selecting time by the user

Question 2

What is the TTL (Time to Live)? Why is it required?

Accepted Answer

TTL is a value in data packet of Internet Protocol It communicates to the network router whether or not the packet should be in the network for too long or discarded Usually, data packets might not be transmitted to their intended destination within a stipulated period of time The TTL value is set by a system default value which is an 8-bit binary digit field in the header of the packet The purpose of TTL is, it would specify certain time limit in seconds, for transmitting the packet header When the time is exhausted, the packet would be discarded Each router receives the subtracts count, when the packet is discarded, and when it becomes zero, the router detects the discarded packets and sends a message, Internet Control Message Protocol message back to the originating host

Question 3

What is the role of compatibility that is used in Android?

Accepted Answer

The compatibility is defined in terms of android compatible devices that run any application This application is written by third party developers using the Android platform that comes in the form of SDK and NDK There are many filters that are used to separate devices that are there to participate in the compatibility mode for the Android applications The devices that are compatible require the android to approve it for their trademark The devices that are not passes the compatibility are just given in the Android source code and can use the android trademark The compatibility is a way through which the user can participate in the Android application platform The source code is free to use and it can be used by anyone

Question 4

What are the multimedia features involved in making Android popular?

Accepted Answer

There is the demand for the rich multimedia that involves many features that are used till now to make the Android market more popular in all the phases The application includes the following: • Mixable audio effects – developer can easily create audio environments using the API key that is provided with it like creating equalization, bass boost, headphone feature, etc The android provide the tools that can be used to mix the audio effects and apply it • There is also support for new media formats like VP8 open video compression format that uses a container format that can run on all the platforms and add the support for AAC and AMR encoding The applications provided allow higher quality video to be captured • The application allows the access to multiple cameras that allows the use of APIs to include the camera and its properties in one The platform provides the application to include the camera with high and low resolution

Question 5

What are the different modes of operations used in services for Android?

Accepted Answer

There are two modes of operations that are necessary to run depending on the value returned by the startcommand() The modes are as follows: - START_STICKY: this mode is used for the services that are explicitly started and stopped according to the need and the requirement of the user - START_NOT_STICKY or START_REDELIEVER_INTENT: this service mode is used for services that are running only when the processing command sent to them That means these run on the basis of the command that is passed to them by giving the instruction of execution - Clients uses the ContextbindService() that is used to get the persistent connection for a service To create a service that is not already running the command onCreate is used

Question 6

What is the procedure to check status of an activity in Android?

Accepted Answer

The status of an activity can be start and stop only The start means the activity is up and running It is in execution state and performing some actions Whereas the stop state defines that the activity is being stopped and performing no action on the system To see or check the status of an activity there is a command that has to be used like NEW_TASK_LAUNCH flag that keeps the track of all the activities that are running and the main command under which the flag resides is given as startActivity() call To bring the activity stack in front of the process that is already running require the command mentioned above to be used The activity can be started remotely by using the remote services These services allow easy interaction with the client and provide the sample to show it on the local server

Question 7

What are the security measures that are taken to make Android secure?

Accepted Answer

Android uses many security measures to keep them away from the hackers They have designed by making changes to the devices or installing a software service on the mobile Android application uses sandbox that is very popular and allow limited access to the information that is very private and sensitive for the user It allows the permissions to be set for the use of the information The security measures that are provided by android is the use of the encryption of the messages that allow user to remain without worry about there phone security They also consists of user terms and agreements that also taken care of Most of the time android doesn't allow other applications to run on their system but it can be done by using different resources that are available on-line As, android is open source it is not fully secure but lots of security issues are being solved for make it more popular and bug free

Question 8

What are the features of iphone 3G?

Accepted Answer

Video: Videos can be edited, shared High quality VGA video can be shot in portrait or landscape - 3 Megapixel Camera: Still photos with greater quality can be taken - Voice control: It recognizes the names in contacts and recognizes the music on iPod - Compass: iPhone 3GS has built-in digital compass, used to point the way - Internet Tethering: Internet surfing can be done from anywhere A 3G connection can be shared on Iphon3 with Mac notebook or laptop

Question 9

What is iphone architecture?

Accepted Answer

It is similar to MacOS X architecture It acts as an intermediary between the iPhone and iPod hardware an the appearing applications on the screen The user created applications never interact directly with the appropriate drivers, which protects the user applications from changes to the hardware

Question 10

Describe the functionality of accelerometer of an iphone

Accepted Answer

iPhone responds to motion using a built-in accelerometer The accelerometer detects the movement and changes the display accordingly, at the time of rotating iPhone from portrait to landscape

Question 11

Explain about the applications that can be used with iphone

Accepted Answer

- Technology, Entertainment and Design(TED): Allows to watch and listen to world’s most fascinating people have to say, all on the iPhone - Market Watch: Breaking news about the investments can be seen To do so, open the Stocks app and rotate - Trends: Latest runway shows, videos from Vogue’s fashion library, reviews, exclusive party pictures, fashion news updates can be seen on Stylecom

Question 12

What are sensors in iphone?

Accepted Answer

The proximity sensor immediately turns off the display when the iPhone is lifted to ear With this sensor the power is saved and accidental dialing is prevented The display is automatically brightens the iPhone by the ambient light sensor when the sunlight or bright rooms and dims in darker places

Question 13

What is Blackberry technology?

Accepted Answer

BlackBerry is nothing but a handheld wireless device that is just like a two way pager It supports the features like mobile telephone, push e-mail, text messaging, web browsing, internet faxing In addition to these, all types of wireless information services and multi-touch interfaces are also included

Question 14

What are the benefits for organizations and IT departments by using Blackberry?

Accepted Answer

Benefits for organizations : The BlackBerry Connect technology allows the organizations for standardizing BlackBerry platform and leverages their existing BlackBerry solution investments The employees’ productivity and performance can also be boosted by providing them the mobile access for their emails and calendars Benefits for IT : IT departments are provided with a solution that is easy to utilize, manage and deploy by using BlackBerry Connect technology Strict requirements for security and manageability will be satisfied and several devices can be connected to the BlackBerry Platform

Question 15

Explain about Blackberry Operating System.

Accepted Answer

Research in Motion, a Canadian company provided a proprietary operating system for BlackBerry The operating system provides support for Java MIDP 10 and WAP 12 The current version supports Novell Group Wise and Lotus Notes Third-party software can be developed using BlackBerry APIs as well, with certain restriction functionality must be signed by RIM digitally, so that it can be associated to a developer account

Question 16

Explain how synchronization takes place with Blackberry Technology .

Accepted Answer

The handheld device is used as a network device, which always connected to the data account of the user via redirector software The software is installed on the BlackBerry Enterprise Server The communication between the software, BE Server and the hand held device’s software is always a two-way street BES immediately updates the mobile device or the email or the calendar account, whenever a change in email account occurs The push technology of BlackBerry keeps the device instantly in “synch” without any effort by the user

Question 17

What are the advantages and disadvantages of 3G?

Accepted Answer

Advantages of 3G: - Overcrowding is relieved in existing systems with radio spectrum - Bandwidth, security and reliability are more - Provides interoperability among service providers - Availability of fixed and variable rates - Support to devices with backward compatibility with existing networks - Always online devices – 3G uses IP connectivity which is packet based - Rich multi media services are available Disadvantages of 3G: - The cost of cellular infrastructure , upgrading base stations is very high - Needs different handsets - Roaming and data/voice work together has not yet been implemented - Power consumption is high - Requires closer base stations and are expensive - Spectrum-license costs, network deployment costs and handset subsidies subscribers are tremendous

Question 18

How can you configure Wi-Fi network and what are Wi-Fi Protocols?

Accepted Answer

Basically there are many standards of Wi-Fi in the industry but some popular of them are 80211a, 80211b, 80211g/n With the support of these Wi-Fi protocols we can communicate/interact among the devices at the speed of 5Ghz to 24Ghz dual band communication If we have Wi-Fi nic card so firstly we have to install their drivers and after installation if we have Wi-Fi access point then we can see the signal strength in the right corner below just open that and find the access point to connect, if access point is configured with the security, type the key to connect and enjoy the service Wi-Fi is technically referred to as the 80211 protocol Over time, Wi-Fi has improved, giving rise to different variations of the protocol 80211a – This version operates at 54Mbps It is considered as the favorite wireless LAN protocol for IP telephony

Question 19

What is Wi-Fi technology and over which frequency band it operates?

Accepted Answer

Wi-Fi technology is a technology used for transmitting a signal using the 80211 specifications works a lot like it does with a basic Ethernet hub: They’re both two-way forms of communication, and they both use the same frequency to both transmit and receive, often referred to a half-duplex WLANs used radio frequencies (RFs) that are radiated into the air from an antenna that creates radio waves These waves can be absorbed, refracted, or reflected by walls, water, and metal surfaces, resulting in low signal strength So because of this vulnerability to surrounding environmental factors, it’s pretty apparent that wire-less will never offer us the same robustness as a wired network can, but that still doesn’t mean we’re not going to use or run the wireless or Wi-Fi

Question 20

Explain the difference between value types and reference types

Accepted Answer

Value type : Stores the data The value of value types is stored on the managed stack They are lighter objects One variable can have only one value Reference Type : Stores the reference to the data A reference type is allocated on the heap They are heavier objects Several variables can reference the same data

Technology Questions