Mobile Computing Devices And Mobile Operating System Computer Science
One of the most widely used mobile OS these days is ANDROID. Android is a linux-based operating system designed for touch screen mobile device, developed by Google in conjunction with the Open Handset Alliance (For more information about the Open Handset Alliance, visit the website at www.openhandsetalliance.com).Google has done just that with Android, its own mobile phone platform (code.google.com/android). Android uses Java and its application frameworks are Java-based, which offers the intriguing possibility of porting field-tested Java ME applications to it. Android is open source, and draws on open-source projects such as Linux, WebKit, SQLite, and FreeType to implement its core services. All of the android application can download in Google Play, there were about 700,000 apps available for Android, and the estimated number of applications downloaded from Google Play was 25 billion. Android Inc was founded in Palo Alto of California, U.S. by Andy Rubin, Rich miner, Nick sears and Chris White in October 2003. Later Android Inc. was acquired by Google in 2005. The handset use android OS have included Samsung, Sony Ericson, LG, Motorola, HTC, Gigabyte, Dell, Vodafone, T-mobile, Huawei and Acer.
After original release there have been number of updates in the original version of Android.
Android 1.1 was developing in February 2009; there are some of the features:
Support added for marquee in system layouts
Details and reviews available when a user searches for businesses on Maps
Longer in-call screen timeout default when using the speakerphone, plus ability to show/hide dialpad
Ability to save attachments in messages
Android 1.5 knows as "Cupcake" developing in April 2009; there are the features of Cupcake:
Bluetooth A2DP and AVRCP support
Uploading videos to YouTube and pictures
Android 1.6 knows as "Donut" developing in September 2009; there are the features of Donut:
WVGA screen revolution support
Google free turn by turn support
Android 2.0/1 knows as "Eclair" developing in October 2009; features:
HTML5 file support
Microsoft exchange server
Android 2.2 knows as "Froyo" developing in May 2010. Features:
USB tethering and Wi-Fi hotspot functionality
Adobe flash 10.1 support
Android 2.3 knows as "Gingerbird" developing in December 2010. Features:
Multi touch software keyboard
Support for extra large screen sizes and resolution
Android 3.0 knows as "Honeycomb" developing in May 2011. Features:
Optimized tablet support with a new user interface
Video chat and Gtalk support
Android 4.0 knows as "Ice-cream Sandwich" developing in October 2011. Features:
A customizable launcher
Better camera performance
Smoother screen rotation
Improved phone number recognition
Built-in photo editor
Android 4.1/2 knows as "Jelly Bean" developing in July 2012. Features:
Multiple user accounts (Tablet only)
Smoother user interface
Offline voice dictation
Google wallet (for nexus 7)
The Android SDK is composed of modular packages that you can download separately using the Android SDK Manager. For example, when the SDK Tools are updated or a new version of the Android platform is released, you can use the SDK Manager to quickly download them to your environment. Simply follow the procedures described in Adding Platforms and Packages.
There are several different packages available for the Android SDK.Available Packages
Contains tools for debugging and testing, plus other utilities that are required to develop an app. If you've just installed the SDK starter package, then you already have the latest version of this package. Make sure you keep this up to date.
Contains platform-dependent tools for developing and debugging your application. These tools support the latest features of the Android platform and are typically updated only when a new platform becomes available. These tools are always backward compatible with older platforms, but you must be sure that you have the latest version of these tools when you install a new SDK platform.
An offline copy of the latest documentation for the Android platform APIs.
There's one SDK Platform available for each version of Android. It includes an android.jar file with a fully compliant Android library. In order to build an Android app, you must specify an SDK platform as your build target.
Each platform version offers one or more different system images (such as for ARM and x86). The Android emulator requires a system image to operate. You should always test your app on the latest version of Android and using the emulator with the latest system image is a good way to do so.
Sources for Android SDK
A copy of the Android platform source code that's useful for stepping through the code while debugging your app.
Samples for SDK
A collection of sample apps that demonstrate a variety of the platform APIs. These are a great resource to browse Android app code. The API Demos app in particular provides a huge number of small demos you should explore.
An SDK add-on that provides both a platform you can use to develop an app using special Google APIs and a system image for the emulator so you can test your app using the Google APIs.
A static library you can include in your app sources in order to use powerful APIs that aren't available in the standard platform. For example, the support library contains versions of the Fragment class that's compatible with Android 1.6 and higher (the class was originally introduced in Android 3.0) and the ViewPagerAPIs that allow you to easily build a side-swipeable UI.
Google Play Billing
Provides the static libraries and samples that allow you to integrate billing services in your app with Google Play.
Google Play Licensing
Provides the static libraries and samples that allow you to perform license verification for your app when distributing with Google Play.
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