[kotlin/android] 안드로이드 코틀린 환경에서 nfc 태깅하기(NfcAdapter)

 

#nfcAdapter을 이용한 처리

#MainActivivy.kt

package com.example.myapplication

import android.app.PendingIntent
import android.content.Intent
import android.content.IntentFilter
import android.nfc.NfcAdapter
import android.nfc.NdefMessage
import android.nfc.Tag
import android.os.Bundle
import android.util.Log
import android.view.View
import android.widget.Button
import android.widget.TextView
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Surface
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.ui.tooling.preview.Preview
import com.example.myapplication.ui.theme.MyApplicationTheme

class MainActivity : ComponentActivity() {
    private var nfcAdapter: NfcAdapter? = null;
    private var txt: TextView? =null;
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.layout);
        txt = findViewById<TextView>(R.id.textView);
        txt?.setText("helloworld");
        Log.d("gofogo","helloworld");
        nfcAdapter  = NfcAdapter.getDefaultAdapter(this@MainActivity);
        var button = findViewById<Button>(R.id.button);
        button.onClick {

            if (nfcAdapter == null) {
                // NFC를 지원하지 않는 디바이스
                txt?.setText("미지원");
                Log.d("gofogo","미지원");
            } else {
                // NFC 기능을 사용할 수 있음

                

                if (nfcAdapter?.isEnabled == true) {
                    txt?.setText("활성화");
                    Log.d("gofogo","활성화");
                } else {
                    txt?.setText("비활성화");
                    Log.d("gofogo","비활성화");
                }
            }
        }
    }

    override fun onResume() {
        super.onResume()
        val intent = Intent(this, javaClass).apply {
            addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP)
        }
        val pendingIntent: PendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE)

        val filters = arrayOf(IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED))
        nfcAdapter?.enableForegroundDispatch(this, pendingIntent, filters, null)
    }

    override fun onPause() {
        super.onPause()
        nfcAdapter?.disableForegroundDispatch(this)
    }

    override fun onNewIntent(intent: Intent?) {
        super.onNewIntent(intent)
        if (NfcAdapter.ACTION_NDEF_DISCOVERED == intent?.action) {
            val tag = intent.getParcelableExtra<Tag>(NfcAdapter.EXTRA_TAG)
            // 여기서 tag를 사용하여 작업 수행
            txt?.setText("태깅");
            Log.d("gofogo","태깅");
        }
    }
}

fun View.onClick(action: (View) -> Unit) {
    setOnClickListener(action)
}

 

#Manifest.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-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:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.MyApplication"
        tools:targetApi="31">

        <activity
            android:name=".MainActivity"
            android:exported="true"
            android:label="@string/app_name"
            android:launchMode="singleTop"
            android:theme="@style/Theme.MyApplication">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
                <action android:name="android.nfc.action.NDEF_DISCOVERED"/>
                <category android:name="android.intent.category.DEFAULT"/>
                <data android:mimeType="text/plain" />
            </intent-filter>
        </activity>
    </application>

</manifest>

 

#kotlin #코틀린 #안드로이드 #andoird #nfc