Thus far Nintendo has released two other mobile games on Android. The first was Super Mario Run, a level based runner starring Nintendo’s mascot. The second was Fire Emblem Heroes, a strategy RPG gacha game starring characters from the long running Fire Emblem franchise. Both games have received a number of updates since their release, including a patch that added a new world, new character, and more to Super Mario Run.
Animal Crossing: Pocket Camp will be free and will contain in app purchases. Here is a trailer with more information: