As introduced via Google this morning, the APIs present in Developer Preview 3 for Android O are the finalized variations, that means, this construct is largely what we will be able to be expecting on the subject of options and functions when Android O starts rolling out to shoppers. This could also be just right for developers who're busy tweaking their programs for release.
So far as the record of Android O options is going, it’s a just right one. There are the large issues, comparable to Image-in-Image mode and Adaptive Icons, however there are many behind-the-scenes enhancements for such things as Spouse Tool Pairing, WiFi Mindful, and VolumeShaper. We did a whole write up on the changes for Android O.
Should you’re on the lookout for a whole record of finalized APIs, you'll be able to in finding detailed knowledge at the Android Developers website.
Android O is launching within the coming months (studies say August), so now can be a great time to get excited if in case you have a tool that’s covered as much as obtain it in a while after availability.
By means of: Android Developers 
Latest Android O Developer Preview Features Finalized APIs is a submit from: Droid Life