How to transfer NFC tagInfo from one intent to another (one interface to another)? - nfc

Question

I want to transfer the nfcID from resolveIntent() function to next intent or interface. I've tried put code below into the function
Intent i = new Intent(NFCLogin.this, User.class);
i.putExtra("nfcID",nfcID);
startActivity(i);
but the apps then crashed. Please help me.
package com.example.johnJones.passkiller;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.app.PendingIntent;
import android.content.IntentFilter;
import android.nfc.NfcAdapter;
import android.nfc.tech.IsoDep;
import android.nfc.tech.MifareClassic;
import android.nfc.tech.MifareUltralight;
import android.nfc.tech.Ndef;
import android.nfc.tech.NfcA;
import android.nfc.tech.NfcB;
import android.nfc.tech.NfcF;
import android.nfc.tech.NfcV;
import android.widget.Toast;
import android.widget.TextView;
public class NFCLogin extends AppCompatActivity {
private final String[][] techList = new String[][] {
new String[] {
NfcA.class.getName(),
NfcB.class.getName(),
NfcF.class.getName(),
NfcV.class.getName(),
IsoDep.class.getName(),
MifareClassic.class.getName(),
MifareUltralight.class.getName(), Ndef.class.getName()
}
};
String nfcID = "";
NfcAdapter mAdapter;
//DatabaseHelper helper = new DatabaseHelper(this);
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_nfclogin);
}
#Override
protected void onResume() {
super.onResume();
// creating pending intent:
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
// creating intent receiver for NFC events:
IntentFilter filter = new IntentFilter();
filter.addAction(NfcAdapter.ACTION_TAG_DISCOVERED);
filter.addAction(NfcAdapter.ACTION_NDEF_DISCOVERED);
filter.addAction(NfcAdapter.ACTION_TECH_DISCOVERED);
// enabling foreground dispatch for getting intent from NFC event:
NfcAdapter nfcAdapter = NfcAdapter.getDefaultAdapter(this);
nfcAdapter.enableForegroundDispatch(this, pendingIntent, new IntentFilter[]{filter}, this.techList);
}
#Override
protected void onPause() {
super.onPause();
// disabling foreground dispatch:
NfcAdapter nfcAdapter = NfcAdapter.getDefaultAdapter(this);
nfcAdapter.disableForegroundDispatch(this);
}
#Override
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
resolveIntent(intent);
}
private void resolveIntent(Intent intent){
String action = intent.getAction();
if (action.equals(NfcAdapter.ACTION_TAG_DISCOVERED)) {
nfcID = ByteArrayToHexString(intent.getByteArrayExtra(NfcAdapter.EXTRA_ID));
Toast.makeText(NFCLogin.this, nfcID, Toast.LENGTH_SHORT).show();
}
}
private String ByteArrayToHexString(byte [] inarray) {
int i, j, in;
String [] hex = {"0","1","2","3","4","5","6","7","8","9","A","B","C","D","E","F"};
String out= "";
for(j = 0 ; j < inarray.length ; ++j)
{
in = (int) inarray[j] & 0xff;
i = (in >> 4) & 0x0f;
out += hex[i];
i = in & 0x0f;
out += hex[i];
}
return out;
}
}
I want to pass the nfcID to next interface which is User.class but the apps crash.

Answer 1

This is how I pass a NFC intent to another activity (named ResultActivity here):
Intent mainintent = getIntent();
if (mainintent.getAction().equals(NfcAdapter.ACTION_NDEF_DISCOVERED)) {
//transfer the NDEF data to a new intent
Parcelable[] rawMsgs = mainintent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
Intent myintent = new Intent(this, ResultActivity.class);
myintent.setAction(NfcAdapter.ACTION_NDEF_DISCOVERED);
myintent.putExtra(NfcAdapter.EXTRA_NDEF_MESSAGES, rawMsgs);
myintent.putExtra(NfcAdapter.EXTRA_TAG, mainintent.getParcelableExtra(NfcAdapter.EXTRA_TAG));
startActivity(myintent);
}