https://thenextweb.com/gaming/2018/08/03/fortnite-google-play-android-users/

Fortnite players waiting raptly for the release of the Android version are going to have a slightly different path than iPhone users. Epic games today confirmed it won’t be offering the game on the Google Play store.

So for everyone who wants to download the game when it finally releases to its one untapped market, you’ll have to download it directly from the Epic Games website. It appears to be a similar process to downloading it on the PC.