The preview includes an updated SDK with system images for the Nexus 5X, Nexus 6P, Nexus Player, Pixel, Pixel XL, Pixel C, and the official Android Emulator, and there’s even an emulator for testing Android Wear 2.0 on Android O. The big highlight with this preview is that the Android O APIs are now final.
Google launched the first Android O developer preview in March and the second developer preview in May at its I/O 2017 developer conference. Google is planning to release one more preview with near-final system images in July and has slated the final version for release “later this summer” (in Q3 2017).
Android O offers of a slew of new features including background limits, notification channels and dots, Autofill APIs, Picture in Picture, XML font resources, downloadable fonts, emoji compatibility, autosizing textview, adaptive icons, Webview enhancements, AAudio API, high-quality Bluetooth audio codecs, wide-gamut color for apps, and Google Play Protect, as well as Java 8 APIs and runtime optimizations.
