The Dark-All-The-Time Solution

The simplest solution for supporting dark mode is simply to always have a dark theme. This means you have just one theme with one set of colors and artwork, to minimize the work of graphic designers. The user gets the benefits all the time, and the dark theme benefits users across Android versions (not just Android 10 users).

However, if you already have a light theme, this will require some amount of work to revise the design.