ANEROID OPERATING SYSTEM

ANEROID OPERATING SYSTEM 

Aneroid was founded in PALOALTO CALIFORNIA united state on October 2003. It is LINUX based operating system. it is basically for touchscreen mobiles like smartphone etc... in aneroid user interface based on the concept of DIRECT MANIPULATION using single and multi touch inputs. aneroid provide a fluid touch interface.

  

Aneroid device boot on HOME SCREEN, which is similar to the desktop(PC's). Aneroid Home screen are typically made up of app icons that launch the associated app, widgets. It also helps to display live , auto updating contents like  whether forecasting, ticket booking etc..

A Home screen is made up of several pages that  user can swips back.

Aneroid has large community developer  writing apps that 

increase the  performance of devices.

In June,2012 there are more than 600,000 apps are available on aneroid. the approximation numbered of application downloaded from Google play was 50 billion.

waterfall model

waterfall model is also called linear or sequential life cycle. it is used in software design life cycle(SDLC). In this model, the sequence is followed top to bottom (like a waterfall) according to the phrases. the phrases are as follows:

*Software Requirement  specification(SRS)                                                                        

*Analysis                                                                       

*Design

*coding

*Testing

*Maintaince

 

*SRS:

It is an intial step that comes before analysis,it is a complete description about the behaviour of software that includes the list of steps, user interaction, designing. it also contain constraints like(quality of software). 

*Analysis:

After srs submittion we have to analyse the software that will be designed is efficient and fulfil the requirement of user. And also estimate the cost that it will be economical or not.

*Design:

it is a process of problem solving and planning for the software solution. after finding all these problem then design the software on paper. in this step eork is not done practically.

*Coding:

after analysis,designing coding is done. In this step designing converted into practical.

*Testing:

after coding the final software will be tested. if any error occur in the software it will be rectify. after rectifying all errors its handover to the user.

*Maintainence:

this time software is in the market and after sending into market some environmental changes effect the software. that changes implemented in the software.

DATA ABSTRACTION

DATA ABSTRACTION  is an important concept of oops. In this, it focuses on important or essential information and filtering the background or useless characteristic of the situation or object that is no necessary for user to know.

* data abstraction is a feature of showing essential features without including unwanted details or explanation.

* data abstraction hides complexity from end users,

lets take an example of person and showing the concept of abstraction:

* when person going for his/her checkup then doctor consider a person as patient. and takes an information related to his/her disease. he is interested to know about his/her disease like syn toms of disease, name of patient, age but he is not interested in characteristic of that particular person like dress of color that he/she wear on that particular day, hobbies, color complex,etc..

*when person going for an interview then interviewer consider that person as a candidate and ask about his/her qualification and his/her interest, same as above interview does not taking interest in his/her personal information.

* another one more example that is switch board 
:- essential information of switch board that we need to know is switch functioning 
and background information that is not required for user is connection of wires.