Developer Preview 4 came out on 24 July 2017, four weeks before the final release. Google called it “a release candidate build of Android O” and “the final preview before we launch the official Android O platform to consumers”.
| Release date | 24 July 2017 |
| Build | OPP4.170623.014 |
| Devices | Nexus 5X, Nexus 6P, Nexus Player, Pixel, Pixel XL and Pixel C; emulator |
| How to get it | Over the air through Android Beta, or by flashing the factory image |
| Platform stability | Yes, since Preview 3 |
The build added no APIs. It brought “the final system behaviors, the latest bug fixes and optimizations”, on the API level 26 that had been final since Preview 3. Support Library 26.0.0 went stable the same day, and Google announced a new Android Testing Support Library with Android Test Orchestrator and multiprocess Espresso.
Google asked developers to finish testing and publish updates at their current target level, checking background location limits, notification channels, and the networking, security and identifier changes. Android 8.0 Oreo shipped on 21 August 2017.