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In 2010, Google launched its Nexus series of devices, a lineup in which Google partnered with different device manufacturers to produce new devices and introduce new Android versions.
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".Perlman refused a stake in the company, and has stated "I did it because I believed in the thing, and I wanted to help Andy." At Google, the team led by Rubin developed a mobile device platform powered by the Linux kernel.Google marketed the platform to handset makers and carriers on the promise of providing a flexible, upgradeable system.The success of Android has made it a target for patent and copyright litigation between technology companies.The company then decided that the market for cameras was not large enough for its goals, and by five months later it had diverted its efforts and was pitching Android as a handset operating system that would rival Symbian and Microsoft Windows Mobile.Its open nature has encouraged a large community of developers and enthusiasts to use the open-source code as a foundation for community-driven projects, which deliver updates to older devices, add new features for advanced users or bring Android to devices originally shipped with other operating systems.
The extensive variation of hardware in Android devices causes significant delays for software upgrades, with new versions of the operating system and security patches typically taking months before reaching consumers, or sometimes not at all.
In addition to touchscreen devices, Google has further developed Android TV for televisions, Android Auto for cars, and Android Wear for wrist watches, each with a specialized user interface.
Variants of Android are also used on game consoles, digital cameras, PCs and other electronics.
Android applications ("apps") can be downloaded from the Google Play store, which features over 2.7 million apps as of February 2017.
Android has been the best-selling OS on tablets since 2013, and runs on the vast majority, Android has two billion monthly active users, and it has the largest installed base of any operating system.
However, Recode reported in June 2015 that the project was "a disappointment", citing "reluctant consumers and manufacturing partners" and "misfires from the search company that has never quite cracked hardware".