7, NFC Technology: Let Android automatically run the program

Two important classes for describing data in ndef format

Ndefmessage: Describes information in the NDEF format Ndefrecord: A piece of information describing Ndef information

Ndefmessage and Ndefrecord are the core classes of Android NFC technology, requiring these two classes for both the read-write ndef format NFC tag and the NDEF format data passed through Android beam technology.

to write data to an NFC tag get Tag Object

Tag tag = Intent.getparcelableextra (Nfcadapter.extra_tag);

Determine the data type of the NFC tag (via the Ndef.get method)

Ndef Ndef = ndef.get (tag);

Write Data

Ndef.writendefmessage (Ndefmessage);

Example: Auto-launch Android app