Android端末を使って、NFC Tagに書き込むプログラムをkotlinで書いてみた ref: https://qiita.com/KazuyukiEguchi/items/8fe6b4b55ef08cc1db93

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="jp.eguchi.android.nfc_writer">

    <uses-permission android:name="android.permission.NFC" />
    <uses-feature android:name="android.hardware.nfc" android:required="true" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

MainActivity.kt

    override fun onNewIntent(intent: Intent) {
        Log.d(TAG,"onNewIntent")

        if (intent == null) {
            return
        }

        Log.d(TAG,"Action" + intent.action)

        if(NfcAdapter.ACTION_TECH_DISCOVERED.equals(intent.action) || NfcAdapter.ACTION_NDEF_DISCOVERED.equals(intent.action)) {

            val tag = intent.getParcelableExtra<Tag>(NfcAdapter.EXTRA_TAG)

            if (tag == null) {
                return
            }

            val ndef = Ndef.get(tag);

            if(ndef == null) {
                return;
            }

            val raws = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);

            if(raws == null){
                return;
            }

            var msgs = arrayOfNulls<NdefMessage>(raws.size)

            for(i in 0..raws.size-1) {
                msgs[i] = raws.get(i) as NdefMessage?
                for(records in msgs) {
                    for(record in records?.records!!){
                        Log.d(TAG,"TNF=" + record.tnf)
                        Log.d(TAG,"mime=" + record.toMimeType())
                        Log.d(TAG,"payload=" + String(record.payload));
                    }
                }
            }
        }
    }