android - Issue in writing NDEF message to NFC tag -

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i trying write ndef message nfc tag. have code write ndef message in onnewintent(). control not going onnewintent(). after onresume(), hanging. pls find below code.

public class mainactivity extends activity {     private bluetoothadapter mbluetoothadapter;     private nfcadapter mnfcadapter;     static final byte[] type_bt_oob = "application/vnd.bluetooth.ep.oob".             getbytes(charset.forname("us_ascii"));     private ndefmessage mndefmessage;     string mlocalbluetoothaddress;     @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);         toast.maketext(this, "inside oncreate", toast.length_long).show();          mnfcadapter = nfcadapter.getdefaultadapter(this);         if (mnfcadapter == null) {             // stop here, need nfc             toast.maketext(this, "this device doesn't support nfc.", toast.length_long).show();             finish();             return;          }     }     public void onresume() {         super.onresume();         toast.maketext(this, "inside onresume", toast.length_long).show();         nfcadapter nfcadapter = nfcadapter.getdefaultadapter(this);         pendingintent pendingintent = pendingintent.getactivity(this, 0, new intent(this, getclass()).addflags(intent.flag_activity_single_top), 0);         nfcadapter.enableforegrounddispatch(this, pendingintent, null, null);     }      public void onnewintent(intent intent) {         toast.maketext(this, "inside onnewintent", toast.length_long).show();          if (nfcadapter.action_tag_discovered.equals(intent.getaction())) {             tag tag = intent.getparcelableextra(nfcadapter.extra_tag);              if (tag != null) {                 ndef ndef = ndef.get(tag);                 if (ndef != null) {                     try {                         ndef.connect();                         ndef.writendefmessage(createhandoverrequestmessage());                     } catch (exception e) {                         log.e("tagwriting", e.tostring());                     } {                         try {                             ndef.close();                         } catch (exception e) {                         }                     }                    }             }          }      }     public void onpause() {         super.onpause();         nfcadapter nfcadapter = nfcadapter.getdefaultadapter(this);         nfcadapter.disableforegrounddispatch(this);     }

i appreciate sorted out.

check manifest file see

<activity     android:name=".mainactivity"     android:alwaysretaintaskstate="true"     android:configchanges="orientation|keyboardhidden|screensize"     android:label="@string/app_name"     android:launchmode="singleinstance"     android:screenorientation="nosensor" >

android:alwaysretaintaskstate="true"

(i use following method , works) if fine try catching pending intent @ oncreate(). 

public class mainactivity extends activity {     private bluetoothadapter mbluetoothadapter;     private nfcadapter mnfcadapter;     static final byte[] type_bt_oob = "application/vnd.bluetooth.ep.oob".             getbytes(charset.forname("us_ascii"));     private ndefmessage mndefmessage;      private pendingintent pendingintent;     string mlocalbluetoothaddress;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);         toast.maketext(this, "inside oncreate", toast.length_long).show();          mnfcadapter = nfcadapter.getdefaultadapter(this);         if (mnfcadapter == null) {             // stop here, need nfc             toast.maketext(this, "this device doesn't support nfc.", toast.length_long).show();             finish();             return;          } else {             pendingintent = pendingintent.getactivity(this, 0, new intent(this, getclass()).addflags(intent.flag_activity_single_top), 0);             ontagfound(getintent());         }     }      public void onresume() {         super.onresume();         toast.maketext(this, "inside onresume", toast.length_long).show();         nfcadapter nfcadapter = nfcadapter.getdefaultadapter(this);         if (nfcadapter != null && pendingintent != null) {             nfcadapter.enableforegrounddispatch(this, pendingintent, null, null);         }     }      public void onnewintent(intent intent) {         toast.maketext(this, "inside onnewintent", toast.length_long).show();         ontagfound(intent);     }      public void ontagfound(intent intent) {         if (nfcadapter.action_tag_discovered.equals(intent.getaction())) {             tag tag = intent.getparcelableextra(nfcadapter.extra_tag);             if (tag != null) {                 ndef ndef = ndef.get(tag);                 if (ndef != null) {                     try {                         ndef.connect();                         ndef.writendefmessage(createhandoverrequestmessage());                     } catch (exception e) {                         log.e("tagwriting", e.tostring());                     } {                         try {                             ndef.close();                         } catch (exception e) {                         }                     }                 }             }          }     }      public void onpause() {         super.onpause();         nfcadapter nfcadapter = nfcadapter.getdefaultadapter(this);         nfcadapter.disableforegrounddispatch(this);     } }

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