lDosBox is a port of the Dosbox emulator (http://www.dosbox.com/).
The modified dosbox sources are included as a tgz archive stored in the internal SD card (Android/data/lb.myapp.dosbox).
lDosBox uses the same interface of my Bochs port lBochs. That means that a virtual PC keyboard is provided but you can use your own virtual keyboard if you like.
It's possible to create shortcuts for different dosbox configurations and even shortcuts for programs.
It registers itself for running .bat files but there are limitations and this may not work on all Android systems.
All the settings are made through a popup menu with quite many options.
The back button usually opens the menu if a menu button is not reported by Android on the device.
Don't mount the root of filesystems containing important data to avoid deleting them by mistake inside the emulator

N.B. This app was first created as an experiment just for my personal use. Then I decided to make it available to the community as I think it can be interesting. There is no official or guaranteed support and I don't know if I'll maintain it in the future years.
The app is still considered in a sort of beta/testing stage.

Many thanks to:
SDL (libsdl.org) - No porting possible without that
Dosbox (dosbox.com) - They made the real thing
Free icons authors (iconarchive.com) - I'm good at coding but bad at drawing

** WARNING **
The app seems quite stable to me but it's easily possible to make it very unstable and it may crash immediately if the user plays too much with the configuration or if the guest system is not managed well.
It's possible that you have to reboot your Android device in some cases.
It's possible that in some cases you have to uninstall and reinstall the app to make it work again.
Than the app may drain your battery quickly but this depends on the configuration (emulated cpu cycles).
It's possible that the device CPU becomes stressed causing overheating.
So use it at your own risk.
** WARNING **