This is an improved version of NFC liberary for Basic4Android. It adds Mifare reading functions and NfcV functions to the original official NFC library.
To make the library:
1.Change the path of paths of 3 dependencies(android.jar, B4AShareed.jar, Core.jar) accordingly.
2.Inside Eclipse choose menu "File>Export>Jar File".
3.Run "Project>Generate Document"
More info please check the discussion in B4X community forum
https://www.b4x.com/android/forum/threads/nfc-library.14933/#content
https://www.b4x.com/android/forum/threads/adding-new-functionalities-and-tags-decoding-to-nfc-library.15946/page-4