The screen might go black for a while but just wait for it to load! mcworld file and click it to import it to Minecraft Pocket Edition.
And the best part is that it supports all operating systems such as iOS, Windows 10 Edition, Amazon/Kindle and Android!
Mods have been popular for a long time for Android but it's only now (in 0.16.0) that add-ons have been introduced as an official feature of the game.