To update an existing MAD install, first stop MAD (this varies depending on how you run MAD), and then update the git repository.
git pull
Then start MAD again.
There are a lot of ways to update an APK on an Android device, probably the most easy way is to use the MADmin Wizard.
Good alternatives are:
ADB (adb install -r app.apk
)
Simple MADmin job (Jobs –> Create APK install job)
Shell scripts like update_mad.sh
When using Docker for hosting MAD you can just pull newer Docker images for every container from the hub:
docker-compose pull
Make sure to restart the stack afterwards.