AndRO is a self-written RO client for Android that is compatible with rAthena, eAthena, and Hercules.
To run it, you need a working game client on your device and a running server.
App will use GRF list from DATA.INI and server list from clientinfo.xml.
Default packet version is 20171227.
You can change it by specifying <version>YYYYMMDD</version> tag in your client's data/clientinfo.xml
For obvious reasons it doesn't support gepard and stuff. Just plain ro protocol.
Download link:
http://roworkshop.com/andro
You may also want to customize your client's data/clientinfo.xml for AndRO by adding some of the additional options that AndRO supports:
http://roworkshop.com/andro/main/clientinfo.html