A new version of the Android app has been submitted to the Play Store which adds a dark theme to it and some other changes. Important: Themes
One important thing to know about this new version is if you use the light theme (default theme) on the native app then when you go to the mobile site from within the native app it'll be the light theme. If you use the dark theme it'll be the dark theme. The native app can be switched to the dark theme from the menu on native app home screen (hit the menu button on your phone or on the top bar), after you get the new update of course.