I only did a quick test but you can use the following as a starting point I suppose :
Code:
Message msg = Message.obtain(Navit.N_NavitGraphics.callback_handler, NavitGraphics.msg_type.CLB_CALL_CMD.ordinal());
Bundle b = new Bundle();
String command = "set_center(\"" + addressSelected.lon + " " + addressSelected.lat + "\");";
b.putString("cmd", command);
msg.setData(b);
msg.sendToTarget();
replace addressSelected.lon and lat with your lon and lat
hint : in a similar manner you can use most of these commands from within the Android code
http://wiki.navit-project.org/index.php/OSD#Commands