Now, According to the latest information, Google is finally adding Dark Mode/ Night Mode to Android 9.0 P.
When a user asked to embed Dark Mode on OLED Screens with Android 9.0, Google's Android Open Source Project (AOSP) moderators said today "our engineering team has added this feature. It will be available in a future Android release." Stay tuned to our Facebook and Twitter page to get the first News.
Dark Mode / Black displays on OLED Screens vastly improves Battery Life on Android Phones. Please kindly add a Dark Mode or Night Theme in Android 9.0 that we can set under "Settings" in Android 9.0. Currently, only by installing 3rd party apps can we enable this Dark Mode.
Google Team: Our engineering team has added this feature. It will be available in a future Android release. //Google