Connecting to an existing Vpn Server With IPSEC

[ahmedespritien]

I have a vpn account from a L2TP/IPSEC VPN Server and use four attributes to connect it from Android or Windows devices: IP Adress, User Name, User Password and PreShared Key. I can connect with these details successfully manually. I also want to connect it programmatically in Android 4.x.

please help me