static Uri PREFERRED_APN_URI = Uri.parse("content://telephony/carriers/preferapn");
ContentResolver cResolver = context.getContentResolver();
Cursor cr = cResolver.query(PREFERRED_APN_URI, null, null, null, null);
cr.moveToFirst();
String user = cr.getString(cr.getColumnIndex("user"));
String pass = cr.getString(cr.getColumnIndex("password"));
//然后對獲取的用戶名和密碼做相關處理獲取對應的apn狀態