OpenVpn Android client, simplified from ics-openvpn.
You should prepare your own client.ovpn file in the assets folder, which decode in here.
And you may translate the OpenVPN Android client into your native language.
GPL v2
Make sure you understand the licenses of the code. OpenVPN for Android is GPL licensed. You CANNOT build a closed sourced custom UI application without acquiring a different (paid) license for UI code.