Android NFC Development Instance

Beam examples provided in Android 4.0 SDK are indeed a good template for NFC development. For the ndef message processing process that understands NFC, see the following code.

Public class beam extends activity implements createndefmessagecallback,
Onndefpushcompletecallback {
Nfcadapter mnfcadapter;
Textview minfotext;
Private Static final int message_sent = 1;

@ Override
Public void oncreate (bundle savedinstancestate ){
Super. oncreate (savedinstancestate );
Setcontentview (R. layout. Main );

Minfotext = (textview) findviewbyid (R. Id. textview );

Mnfcadapter = nfcadapter. getdefaadapter adapter (this); // instantiate an NFC Device
If (mnfcadapter = NULL ){
Minfotext = (textview) findviewbyid (R. Id. textview );
Minfotext. settext ("NFC is not available on this device .");
}

Mnfcadapter. setndefpushmessagecallback (this, this); // registers the ndef callback message
Mnfcadapter. setonndefpushcompletecallback (this, this );
}

@ Override
Public ndefmessage createndefmessage (nfcevent event ){
Time time = new time ();
Time. settonow ();
String text = ("Beam me up! \ N "+
"Beam time:" + time. Format ("% H: % m: % s "));
Ndefmessage MSG = new ndefmessage (
New ndefrecord [] {createmimerecord (
"Application/COM. example. Android. Beam", text. getbytes ())
});
Return MSG;
}

@ Override
Public void onndefpushcomplete (nfcevent arg0 ){
// A handler is needed to send messages to the activity when this
// Callback occurs, because it happens from a binder thread
Mhandler. obtainmessage (message_sent). sendtotarget ();
}

Private Final handler mhandler = new handler (){
@ Override
Public void handlemessage (Message MSG ){
Switch (msg. What ){
Case message_sent:
Toast. maketext (getapplicationcontext (), "message sent! ", Toast. length_long). Show ();
Break;
}
}
};

@ Override
Public void onresume (){
Super. onresume ();
If (nfcadapter. action_ndef_discovered.equals (getintent (). getaction ())){
Processintent (getintent ());
}
}

@ Override
Public void onnewintent (intent ){
// Onresume gets called after this to handle the intent
Setintent (intent );
}

/**
* Parses the ndef message from the intent and prints to the textview
*/
Void processintent (intent ){
Parcelable [] rawmsgs = intent. getparcelablearrayextra (
Nfcadapter. extra_ndef_messages );
// Only one message sent during the beam
Ndefmessage MSG = (ndefmessage) rawmsgs [0];
// Record 0 contains the MIME type, record 1 is the AAR, if present
Minfotext. settext (new string (msg. getrecords () [0]. getpayload ()));
}

/**
* Creates a custom MIME type encapsulated in an ndef record
*
* @ Param mimetype
*/
Public ndefrecord createmimerecord (string mimetype, byte [] payload ){
Byte [] mimebytes = mimetype. getbytes (charset. forname ("US-ASCII "));
Ndefrecord mimerecord = new ndefrecord (
Ndefrecord. tnf_mime_media, mimebytes, new byte [0], payload );
Return mimerecord;
}

@ Override
Public Boolean oncreateoptionsmenu (menu ){
// If NFC is not available, we won't be needing this menu
If (mnfcadapter = NULL ){
Return super. oncreateoptionsmenu (menu );
}
Menuinflater Inflater = getmenuinflater ();
Inflater. Inflate (R. Menu. Options, menu );
Return true;
}

@ Override
Public Boolean onoptionsitemselected (menuitem item ){
Switch (item. getitemid ()){
Case R. Id. menu_settings:
Intent intent = new intent (settings. action_nfcsharing_settings );
Startactivity (intent );
Return true;
Default:
Return super. onoptionsitemselected (item );
}
}
}