Hey-ho, I know this is a big ol necropost but it falls under the same topic and I didn't think it needed a new one (but if it do then I will)
My project here will no longer be maintained (really all I've done is try to make sure it still compiles), but a newer, more streamlined version has been produced by xilefien over on rmweb
https://forums.rpgmakerweb.com/index.php?threads/exporting-to-android-mv-android-client.84971/Editing is super minimal and kept to one file, more or less.
I'm working on getting the Google Play API stuff (btw, shoutout to Google for deprecating a large portion of my stuff) in as a pull request and I believe another user is trying to do the same with OBB/expansion files, except he's managed to do it so you don't have to edit rpg_managers.js, so it'll have the same features pretty quick.
EDIT: also I like his instructions better and I find them easier to follow