Android: Most Popular Operating System for Smart phones:

The dynamics of how the world communicates with each other has changed rapidly over the years , most significantly on the ability to access traffic information provided to us by smartphones - and this trend is increasing. Mobile Phones in Pakistan Since 2009, the cost of smartphone users will surpass the forecast for consumer notebooks (Gartner, 2009). These devices capture a larger share of the telecommunications market opens up a wide range of options for hardware manufacturers , and even more so for system manufacturers . Compared with laptops , smart phones provide many other problems from the point of view of the requirements , they are constantly on, are always expected to be connected via the cellular network and the Internet , and riddled with hardware limitations due to their size . Since at the present time, many mobile operating systems in the market, it is significant to be able to assess the quality and suitability of these operating systems.

This paper proposes a framework for comparing mobile operating systems, focusing on the features required for any smartphone to work effectively, and then use the four most popular platforms today against this Framework, Android devices, iPhone, Symbian and Windows Mobile. Digital Camera Price in Pakistan The results of this two- fold, firstly, it is working to develop a sustainable model for the comparison of mobile operating systems and, secondly, he standardizes basic architectural considerations that beginners should stick to.

Will be developed based on the study of comparison criteria computer operating systems and adjust it to fit expectation, which will be presented in the method section of this article. The results of the first section to show how the architecture of each platform opposed the proposed framework, and second, to discuss how to score a proportional part of the actual success of the platform in the market today. Conclusion section summarizes the findings and suggests other considerations that could contribute to the future study of this framework.

Android was originally developed by Android, later bought by Google, and most recently, Alliance Open Handset Alliance, Android distribution alliance. Android distribution November 5, 2007 announced the formation of an Alliance Open Handset Alliance, 47 hardware, software and telecom consortium dedicated to advancing open standards for mobile devices (Wikipedia, 2010) Open source Google Android is free and released under the license Android Apache architecture consists of five parts:  The kernel Linux, performance (Dalvik Virtual Machine), application platform and the application itself.

Multi-tasking:

The application framework supports multi-tasking, allowing activities (user interface component) to reside in the background activity is displayed in the foreground. Each action is executed as a separate process and preemptive multitasking scheduling is handled Linux. Samsung Digital Cameras Price in Pakistan While this is an integral part of Android, it should be noted that it is still to be seen what effect this will have on the phone memory and performance (Porges, 2008), but with a priority level of flow of 40 (Wei, Chang, Chang and Nichols, 2009), there are several accounts of multitasking that affect performance.

Memory Management:

Memory management is handled by Linux. In addition, Android uses the Dalvik virtual which is an extremely low- memory -based virtual machine designed specifically for Android to run on embedded systems and work well in low- power (Katysovas, 2008). It converts files into executable Java Dalvik (DEX) files as compact bytecode format application that works with lower memory usage. However, frequent garbage collection can affect users, producing a slight ' hiccup.

When memory runs out, the system closes the application activity. However, the user should be able to return to work and found his condition unchanged. Panasonic Lumix camera price in Pakistan Developers implement the onSaveInstanceState () method to save the state of a “bundle “before the activity is destroyed. When the activity started again, went like a bunch of On Create () method to call when ONSTART (), onRestoreInstanceState (), so that one or both of them can recreate the captured state.

Network:

Android operating system supports 3G, Wi-Fi wireless and their latest version, support for Bluetooth 2.1.

Power consumption:

Android OS proposals the following power-management features: screen on / off, switching the screen and keyboard backlight, brightness, sleep and standby processor, RPC calls, battery status change events, the installation of power change event (Wei, Chandran, Chang, & Nichols, 2009).

Android provides a lot of control over its functions; it provides developers with access to the power consumption statistics and the ability to respond to these states, and not to change the status of the device. While developers can use the API to control the power management power peripheral devices, they can also directly control the power that the device uses all thus optimizing energy consumption.

Barriers to Entry:

The Android platform is open source and well documented online. SDK is free to download and the software can be tested on devices out of the box usually use Eclipse, Java language that comes with the Android Development Toolkit. Online Shopping in Pakistan To publish applications on the market android, $ 25 registration fee is required. Originally only free applications were supported. Paid apps are available on the Android market in the U.S. since February 19, 2009 (Wikipedia, 2010), with a 30% commission for developers.

Gadgetry:

Android operating system also provides an API to support the "New Project", such as GPS and accelerometers.