The status of the current apn in Android and the method of obtaining it

static Uri PREFERRED_APN_URI = ("content://telephony/carriers/preferapn");
ContentResolver cResolver = ();
Cursor cr = (PREFERRED_APN_URI, null, null, null, null);
();
String user = (("user"));
String pass = (("password"));
//Then do related processing to obtain the username and password to obtain the corresponding apn status