https://www.gamespot.com/articles/fortnite-android-how-to-download-the-game/1100-6462465/

Epic's hit battle royale game, Fortnite, made its long-awaited debut on Android earlier this summer, but up until now, it has only been available to users who received an invite for the beta. That has changed, and now all Android owners can download the Fortnite beta even without an invitation, provided they have a compatible device. Here's how you can jump in.

Unlike most other games available on Android, Fortnite can't be downloaded through the Google Play store. Epic had previously announced that it is bypassing Google's app store and offering the game to fans directly through its own website. If you want to download Fortnite on Android, all you'll need to do is go here on your phone and scan the QR code when prompted.