Reading an NDEF message from an NFC tag from an Android application -

i trying create application using nfc , want try , read nfc tag , text message tag , place textview. have code already, nothing happens when try pair phone nfc tag.

here code , please @ , see doing wrong , needs done fix issue please:

button measurementsdatabutton; nfcadapter mynfcadapter; pendingintent mypendingintent; intentfilter ndef; intentfilter[] filters; string[][] techlists; int mcount; textview mtext; string payload; byte payloadheader;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_nfc_scanner);      final actionbar actionbar = getactionbar();     actionbar.setdisplayhomeasupenabled(true);      mtext = (textview) findviewbyid(r.id.flowtextview1);      measurementsdatabutton = (button) findviewbyid(r.id.measurementsbutton1);     measurementsdatabutton.setonclicklistener(this);      mynfcadapter = nfcadapter.getdefaultadapter(this);      mypendingintent = pendingintent.getactivity(this, 0, new intent(this, getclass()).addflags(intent.flag_activity_single_top), 0);      ndef = new intentfilter(nfcadapter.action_ndef_discovered);     filters = new intentfilter[] {ndef, };     techlists = new string[][] {new string[] {ndef.class.getname()}, new string[] {ndefformatable.class.getname()}}; }  @override public void onpause() {     super.onpause();     mynfcadapter.disableforegrounddispatch(this); }  @override public void onresume() {     super.onresume();      if(mynfcadapter != null) {          mynfcadapter.enableforegrounddispatch(this, mypendingintent, filters, techlists);      }  }  @override public void onnewintent(intent intent) {      if (nfcadapter.action_ndef_discovered.equals(getintent()))     {         ndefmessage [] messages = getndefmessages(getintent());         for(int = 0; i<messages.length; i++)          {             for(int j = 0; j<messages[0].getrecords().length; j++)             {                 ndefrecord record = messages[i].getrecords()[j];                 payload = new string(record.getpayload(), 1, record.getpayload().length-1, charset.forname("utf-8"));                 mtext.settext(payload);                 payloadheader = record.getpayload()[0];             }         }     } }  ndefmessage[] getndefmessages(intent intent) {     // todo auto-generated method stub      ndefmessage[] message = null;     if (nfcadapter.action_ndef_discovered.equals(intent.getaction())) {          parcelable[] rawmessages = intent.getparcelablearrayextra(nfcadapter.extra_ndef_messages);          if(rawmessages != null) {              message = new ndefmessage[rawmessages.length];             for(int = 0; < rawmessages.length; i++) {                  message[i] = (ndefmessage) rawmessages[i];              }         }             else {                 byte[] empty = new byte[] {};                 ndefrecord record = new ndefrecord (ndefrecord.tnf_unknown, empty, empty, empty);                 ndefmessage msg = new ndefmessage (new ndefrecord[] {record});                 message = new ndefmessage[] {msg};             }          }             else {                 log.d("", "unknown intent.");                 finish();                 }       return message; } 

example of code send-receive ndef tag:

public class mainactivity extends appcompatactivity implements nfcadapter.createndefmessagecallback {  private nfcadapter mnfcadapter; textview tv; private pendingintent mpendingintent; @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      tv = (textview) findviewbyid(r.id.textviewreceivedmessage);      nfcmanager nfcmanager = (nfcmanager) getsystemservice(nfc_service);     mnfcadapter = nfcmanager.getdefaultadapter();      mpendingintent = pendingintent.getactivity(this, 0, new intent(this, getclass())             .addflags(intent.flag_activity_single_top), 0); }  private static ndefmessage gettestmessage() {     byte[] mimebytes = "application/com.android.cts.verifier.nfc"             .getbytes(charset.forname("us-ascii"));     byte[] id = new byte[] {1, 3, 3, 7};     byte[] payload = "cts verifier ndef push tag".getbytes(charset.forname("us-ascii"));     return new ndefmessage(new ndefrecord[] {             new ndefrecord(ndefrecord.tnf_mime_media, mimebytes, id, payload)     }); }   @override protected void onresume() {     super.onresume();      mnfcadapter.enableforegrounddispatch(this, mpendingintent, null, null);     mnfcadapter.setndefpushmessagecallback(this, this); }  // sending message @override public ndefmessage createndefmessage(nfcevent event) {     return gettestmessage(); }   private ndefmessage[] getndefmessages(intent intent) {     parcelable[] rawmessages = intent.getparcelablearrayextra(nfcadapter.extra_ndef_messages);     if (rawmessages != null) {         ndefmessage[] messages = new ndefmessage[rawmessages.length];         (int = 0; < messages.length; i++) {             messages[i] = (ndefmessage) rawmessages[i];         }         return messages;     } else {         return null;     } }  static string displaybytearray(byte[] bytes) {     string res="";     stringbuilder builder = new stringbuilder().append("[");     (int = 0; < bytes.length; i++) {         res+=(char)bytes[i];     }     return res; }  // displaying message @override protected void onnewintent(intent intent) {     super.onnewintent(intent);      ndefmessage[] messages = getndefmessages(intent);     tv.settext(displaybytearray(messages[0].tobytearray())); } 

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