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Beginning with , "expandable notifications" allow the user to tap an icon on the notification in order for it to expand and display more information and possible app actions right from the notification.
including a , , a handset based on , documentation, sample code, and tutorials.
In addition to touchscreen devices, Google has further developed for televisions, for cars, and for wrist watches, each with a specialized user interface.
Variants of Android are also used on , , , and other electronics.
Since 2008, Android has seen which have incrementally improved the operating system, adding new features and fixing in previous releases.
Each major release is named in alphabetical order after a dessert or sugary treat, with the first few Android versions being called "", "", "", and "", respectively.
Android's is mainly based on , using touch gestures that loosely correspond to real-world actions, such as swiping, tapping and pinching, to manipulate on-screen objects, along with a for text input.Google later changed its Android specification documents to state that "Touchscreens will be supported", although "the Product was designed with the presence of discrete physical buttons as an assumption, therefore a touchscreen cannot completely replace physical buttons".On November 5, 2007, the , a of technology companies including Google, device manufacturers such as , and , wireless carriers such as and , and chipset makers such as and , unveiled itself, with a goal to develop "the first truly open and comprehensive platform for mobile devices".Historically, Android's platform fragmentation caused issues with security, in which the majority of Android devices did not receive , but recent developments have improved the situation.The success of Android has made it a target for patent and copyright litigation as part of the so-called "" between technology companies.