The Google Pixel 2 XL might come with Always-On Display, previous rumors suggested. But you don’t have to wait for that one to get the feature – one user at XDA found a way to run it on any rooted Android Oreo phone.
A mere modification of the AmbientDisplayConfiguration.java will make the Always-On Display option to appear in Settings once false is changed to true. Then the Always On Ambient Display pops up inside System UI Tuner. Many unofficial ports already enabled the feature.
Googles implementation works similarly to Samsungs or LGs AOD. The clock is always visible, a notification appears with full content, before fading into an icon. A possible reason for lacking the feature in the official version is that Google is adding some final touches or the current version is unstable.
The Always-On Display might be officially announced with the Pixel 2 unveiling that is taking place on October 4.