Android Oreo
version of the Android mobile operating system
Android Oreo (codenamed Android O during development) is the eighth major release and the 15th version of Android, a mobile operating system.
It was initially unveiled as an alpha quality developer preview in March 2017 and later made available to the public on August 21, 2017.
It contains several major features, including notification channels, picture-in-picture support for video, performance improvements, and battery usage optimization, and support for autofillers, Bluetooth 5, system-level integration with VoIP apps, wide color gamuts, and Wi-Fi Aware. Android Oreo also introduces two major platform features: Android Go – a software distribution of the operating system for low-end devices – and support for implementing a hardware abstraction layer.
As of June 2026, 2.03% of Android devices run Android Oreo, making it the 9th most widely used version of Android.
History
Android Oreo was internally codenamed "Oatmeal Cookie." On March 21, 2017, Google released the first developer preview of Android "O", available for the Nexus 5X, Nexus 6P, Nexus Player, Pixel C, and both Pixel smartphones. The second, considered beta quality, was released on May 17, 2017. The third developer preview was released on June 8, 2017, and offered a finalized version of the API. DP3 finalized the release's API to API level 26, changed the camera UI, reverted the Wi-Fi and cellular connectivity levels in the status bar back to Wi-Fi being on the left, added themed notifications, added a battery animation in Settings: Battery, a new icon and darker background for the Clock app, and a teardrop icon shape for apps.
On July 24, 2017, a fourth developer preview was released, which included the final system behaviors and the latest bug fixes and optimizations. Android "O" was officially released on August 21, 2017, under the name "Oreo", after the Oreo brand of sandwich cookie.
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