java - How to write data as multiple records on NFC tag in Android? -

i followed this write data nfc tag.

this mainactivity , nfcmanager.

i write data nfc tag.

but placing data in record 0 only. there no other records created on tag.

however, want place data multiple records record 0, record 1, record 2, record 3.

so modified mainactivity this

@override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      nfcmger = new nfcmanager(this);      v = findviewbyid(r.id.mainlyt);      final edittext et0 = (edittext) findviewbyid(r.id.cnt0);     final edittext et1 = (edittext) findviewbyid(r.id.cnt1);     final edittext et2 = (edittext) findviewbyid(r.id.cnt2);     final edittext et3 = (edittext) findviewbyid(r.id.cnt3);      floatingactionbutton btn = (floatingactionbutton) findviewbyid(r.id.fab);     btn.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view v) {              string ct0 = et0.gettext().tostring();             string ct1 = et1.gettext().tostring();             string ct2 = et2.gettext().tostring();             string ct3 = et3.gettext().tostring();               message =  nfcmger.createurimessage(ct0, "id");             message =  nfcmger.createurimessage(ct1, "name");             message =  nfcmger.createurimessage(ct2, "role");             message =  nfcmger.createurimessage(ct3, "level");               if (message != null) {                  dialog = new progressdialog(mainactivity.this);                 dialog.setmessage("tag nfc tag please");                 dialog.show();             }         }     });  } 

but when use , write data tag stores record 0 on tag. there no other record.

i last saved data in record 0:

my expectation write data multiple records this:

can suggest me how insert data multiple records (record 0, record 1, record 2, record 3)?

update

with reference of user@michael roland have updated code got error

here followed method ndefrecord.createtextrecord(“en” , “string”) not working below api level 21 , have given ndefrecord method showing error when give same message = new ndefmessage(new ndefrecord[] {

so out side message not error want inside message

thanks @michael roland support

you find 1 message containing 1 record on tag because that's in code. here create 1 ndef message containing 1 uri record:

message =  nfcmger.createurimessage(ct0, "id"); 

right on next line overwrite stored message (referenced in message) ndef message containing 1 uri record:

message =  nfcmger.createurimessage(ct1, "name"); 

and on next 2 lines same thing again:

message =  nfcmger.createurimessage(ct2, "role"); message =  nfcmger.createurimessage(ct3, "level"); 

consequently, last line store ndef message in message.

you store message onto tag¹.

however, given above screenshot, rather want create 1 ndef message containing 4 text records. e.g. this:

message = new ndefmessage(new ndefrecord[] {         ndefrecord.createtextrecord("en", "text 1"),         ndefrecord.createtextrecord("en", "text 2"),         ndefrecord.createtextrecord("en", "text 3"),         ndefrecord.createtextrecord("en", "text 4"), }); 

btw. since createtextrecord() available starting api level 21, might want check out method ndefrecord.createtextrecord("en" , "string") not working below api level 21 lower api levels.

also note text records intended storing human-readable textual data. storing machine-readable information, other records (such nfc forum external type) more suitable.

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¹) though, seem rather reluctant present mcve believe readers of question want browse through tons of unnecessary code on github understand problem. note that code might not exist whole lifetime of question , once source code disappears, question useless others.

finally, note if observed 1 record of type text/plain textual value "junior" on tag, did not use code github without further modifications since code revealed have created 1 (malformed?) uri record.