Last year Google released a research showing the benefits of Dark Mode on the battery especially if the device uses AMOLED or OLED screen. Unfortunately, Google couldn’t follow its own research as Android Pie skipped system-wide dark mode support.
However, this is set to change as Google is finally considering system-wide dark mode support in Android Q. The nex version of Android is supposed to release in Q2 of 2019. The information comes from a tracker on Chromium Gerrit set up by a Googler, named “Modify Core UI elements and create setting to enable Dark Mode”. Furthermore, it seems that “dark mode is an approved [Android] Q feature”, as the description states in the tracker. He even explained that “[Android] Q team wants to ensure that all preloaded apps support dark mode natively”.
With the explanation, it’s pretty clear that Google is finally adding system-wide dark mode support in Android Q. Dark Mode is certainly an overdue feature and it was about time that Google decided to add it to Android.