Documentation of Operating Systems and Developers

Android OS

The android platform was founded by Google and offers on the base the Linux kernel 2.6 a uniform interface for mobile equipment and programmes. Through this it is easily to port and is programmed in Java. After the conversion into the own binary program format Dalvik (.dex) it is not compatible to Java any more. Advantage is the faster execution and the lower memory footprint of programmes than in pure Java. Every Dalvik application is executed in a Dalvik VM of its own. Applications can access all equipment functions. This makes it possible for the programmer to make innovative programmes which offers the user high value by the combination of all sorts of data sources with the equipment functions.

The Eclipse IDE with an official plugin is used for the development. The operating system Android for Smartphones is supported by the Open Handset Alliance. Including more than 30 communication provider, equipment and semiconductor manufacturers as well as software companies. Because Android is an open platform in the meaning of the software and product development the source code shall be available completely at a later time and is in opposite with the market leading closed operating systems Symbian, Palm OS and Windows Mobile.

Android include C/C++ function libraries used by different parts of the operating system.

• Surface manager for 2D and 3D even overlay display
• System C library, specialized for Linux-based devices (BSD implementation)
• SGL, 2D graphic system
• 3D libraries, based on OpenGL ES 1.0 APIs with hardware or software accelerated 3D display
• Media libraries for playback and record of audio, graphic and video formats (MPEG4, H.264, MP3, AAC, AMR, JPG, PNG)
• LibWebCore, Android internet browser
• FreeType, for representing of bitmap and vector fonds
• SQLite, an efficient and slim relational database for all applications

The Android SDK is available for Linux, MacOS and Windows. It contains an emulator with the surface of Android to try applications. After unpacking the SDK the emulator can be found in the subdirectory " oolsemulator.exe" that shows a HTC Smartphone with keyboard.
Standard programs for e-mail, SMS, contacts, calendar, road maps, internet browser and others are preinstalled.

The first Google Android Developer Challenge (ADC) started in April 2008 for engaged programmers to realize and present ideas. Approximately 1,800 programmes were submitted and 20 honoured with a price money under the best 50. Part of the best applications are for example cab4me by combination of Google Maps, GPS signal and a database to send a taxi in the simplest mode by click to the current position on the map. Or GoCart which reads the bar code of goods with the mobile telephone camera and looks over onlineshops and registered shops in the circumference for the best price.

Google creates a sales platform for Smarthone applications with Android Market. At first the market place is provided free of charge. The first Android mobile telephone cames from the taiwanese manufacturer HTC with the T-Mobile G1 smartphone starting at October 22nd, 2008 in the USA and at the beginning of 2009 in Germany. The Android Market was renamed in Google Play on 6th March 2012.

The market research group Gartner, Inc. released a press news about the worldwide market share of smartphone ventors and operating systems on 19th August 2016. In the 2nd quarter 2016, 296.9 million Android units have been sold, this represents a market share of 86.2%. The Android operating system increased his share, in 2nd quarter 2015 the market share was 82.2% with 271.6 million units sold.

Android OS 1.0, Boot screen text	Android OS 1.0, Boot screen logo	Android OS 1.0, Screenshot 1 (SDK)	Android OS 1.0, Screenshot 2 (SDK)
Android OS 1.0, Wallpaper	Android OS 1.0, Google Search	Android OS 1.0, Google Website	Android OS 1.0, Google Search result
Android OS 1.0, Google Maps 1	Android OS 1.0, Google Maps 2	Android OS 1.0, Contacts	Android OS 1.0, Telephone
Android OS 1.0, Applications	Android OS 1.0, OpenGL Demo	Android OS 1.0, Screen locked	Android OS 1.0, Shutdown screen
Android OS 1.0, Power off	Android OS 1.0, Screen in landscape format	Android OS 1.0, Screen in landscape format	Android OS 1.0, Linux Kernel 2,6, Android Runtime, Dalvik VM, Applications
Android 4.4 (KitKat), Home screen with App shortcuts	Android KitKat, Interaction with App shortcuts	Android KitKat, Notification bar with quick settings	Android KitKat, All quick settings for the notification bar
Android KitKat, Tap the home screen for further options	Android KitKat, Run Apps or add them to the home screen	Android KitKat, Add Widgets to the home screen	Android KitKat, Set wallpaper for the screen
Android KitKat, Overview of running Apps in background	Android KitKat, Switch between virtual screens with a swipe gesture	Android KitKat, Device options after pushing the power button on the smartphone	Android KitKat, Draw lock pattern to unlock screen
Android KitKat, Google Play Store	Android KitKat, Google Play Store settings	Android KitKat, General settings	Android KitKat, Application manager
Android KitKat, App info of Google Play Store	Android KitKat, History details about battery usage	Android KitKat, Battery usage sorted by Apps	Android KitKat, Configure the power saving mode
Android KitKat, Security settings	Android KitKat, Device details about Samsung S3 Neo with Android 4.4.2	Android KitKat, Device status	Android KitKat, Mobile network settings
Android KitKat, Controls settings	Android KitKat, Display settings	Android KitKat, Connection settings	Android KitKat, Data usage for mobile data
Android KitKat, Phone App	Android KitKat, Inbox of Gmail App	Android KitKat, Google Maps App	Android KitKat, Google website with Chrome browser
Android KitKat, Google search results with Chrome browser	Android KitKat, Fallout Shelter App running	Android KitKat, In-game graphic of Fallout Shelter	Android KitKat, In-game graphic of Fallout Shelter
Android 5.0.1, Lock screen of a Lenovo tablet	Android 5.0.1, Homescreen with standard apps	Android 5.0.1, unfolded status bar with quick access to features and settings	Android 5.0.1, standard apps
Android 5.0.1, more standard apps	Android 5.0.1, control panel for settings	Android 5.0.1, control panel for more settings	Android 5.0.1, battery usage status and informations
Android 5.0.1, internal storage informations	Android 5.0.1, manage the installed apps	Android 5.0.1, running apps and app RAM usage	Android 5.0.1, security settings
Android 5.0.1, overview of app permissions	Android 5.0.1, configure the app permissions	Android 5.0.1, informations about the Lenovo TAB 2 A10-70F

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