Scanning NFC type v tag

I am developing an application in Android studio that should be to scan for an NFC type v tag. If I can just instantiate the tag object then I can perform further operations with the tag but I am having trouble with scanning the tag.

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools">
<uses-feature
android:name="android.hardware.nfc"
android:required="true" />
<uses-permission android:name="android.permission.NFC" />
<application
android:allowBackup="true"
android:dataExtractionRules="@xml/data_extraction_rules"
android:fullBackupContent="@xml/backup_rules"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/Theme.NfcTool"
tools:targetApi="30">
<activity
android:name=".MainActivity"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<intent-filter>
<action android:name="android.nfc.action.TECH_DISCOVERED" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
</manifest>

and here is my MainActivity.java

package com.example.nfctool;
import androidx.appcompat.app.AppCompatActivity;
import android.app.PendingIntent;
import android.content.Intent;
import android.nfc.NfcAdapter;
import android.nfc.Tag;
import android.nfc.tech.NfcV;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
private NfcAdapter nfcAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
nfcAdapter = NfcAdapter.getDefaultAdapter(this);
}
@Override
protected void onResume() {
super.onResume();
// Enable NFC foreground dispatch to capture NFC intents
// creates an explicit intent to launch the MainActivity when an NFC intent is dispatched.
Intent intent = new Intent(this, MainActivity.class);
// This flag ensures that if the MainActivity is already in the foreground, it will not be recreated and instead receive the NFC intent in its onNewIntent() method.
intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
// creates a pending intent that wraps the intent we created earlier. It will be used to handle the NFC intent when it arrives.
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_IMMUTABLE);
// enables the foreground dispatch system for NFC intents
nfcAdapter.enableForegroundDispatch(this, pendingIntent, null, null);
}
@Override
protected void onPause() {
super.onPause();
// Disable NFC foreground dispatch
nfcAdapter.disableForegroundDispatch(this);
}
@Override
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
Log.d("DEBUG","###############" + intent.getAction());
// Check if the intent has an NFC tag
//        if(intent.getAction() == NfcAdapter.ACTION_TECH_DISCOVERED){
if (NfcAdapter.ACTION_TECH_DISCOVERED.equals(intent.getAction())){
// Get the tag object
Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
// Check if the tag supports NfcV technology
if (NfcV.get(tag) != null) {
// Instantiate the NfcV object with the tag
NfcV nfcvTag = NfcV.get(tag);
// Use the NfcV object for further operations
// ...
Toast.makeText(this, "NFC tag detected", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this, "Unsupported tag technology", Toast.LENGTH_SHORT).show();
}
}
}
}

when I log the value of intent.getAction() in the onNewIntent method it logs a null value
D ###############null

So I know that the action of the intent is not being set. IF someone could point out where I am going wrong or what I am missing it would be greatly appreciated.

One possible problem the PendingIntent.FLAG_IMMUTABLE should be PendingIntent.FLAG_MUTABLE

This is because a PendingIntent is an object can be handed to other applications so that they can perform the action you described on your behalf at a later time.

So you are handing this to the System NFC service which then adds the NFC data and returns it to at a later time, Thus it has to be changeable (Mutable).

Also from the docs You can see in the example it has to be Mutable.

Also note that using enableForegroundDispatch is actually not the best way to use NFC using enableReaderMode is a newer and much better API to use NFC. enableReaderMode does not use Intent's and gives you more control, it is easy to do NFC operations in a background Thread (which is recommended), for writing to NFC Tag's it is much more reliable and leads to less errors.