Android实现读取NFC卡卡号示例，具体如下：

1.权限

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

2.注册(静态)

<intent-filter> <action android:name="android.nfc.action.TAG_DISCOVERED" /> <data android:mimeType="text/plain" /> </intent-filter>

3.Activity

初始化

//初始化NfcAdapter mNfcAdapter = NfcAdapter.getDefaultAdapter(this); // 初始化PendingIntent，当有NFC设备连接上的时候，就交给当前Activity处理 pi = PendingIntent.getActivity(this, 0, new Intent(this, getClass()) .addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);

启动

@Override protected void onResume() { super.onResume(); mNfcAdapter.enableForegroundDispatch(this, pi, null, null); //启动 }

获取数据

@Override protected void onNewIntent(Intent intent) { super.onNewIntent(intent); // 当前app正在前端界面运行，这个时候有intent发送过来，那么系统就会调用onNewIntent回调方法，将intent传送过来 // 我们只需要在这里检验这个intent是否是NFC相关的intent，如果是，就调用处理方法 if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(intent.getAction())) { processIntent(intent); } }

解析

/** * Parses the NDEF Message from the intent and prints to the TextView */ private void processIntent(Intent intent) { //取出封装在intent中的TAG Tag tagFromIntent = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG); String CardId =ByteArrayToHexString(tagFromIntent.getId()); }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; }

4.完整参考

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android" package="cn.com.jslh.zjcdprogrect"> <uses-permission android:name="android.permission.NFC" /> <uses-permission android:name="android.permission.INTERNET" /> <uses-feature android:name="android.hardware.nfc" android:required="true" /> <application android:name=".common.MyApplication" 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=".LoginActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name=".saoka.WorkActivity"> <intent-filter> <action android:name="android.nfc.action.TAG_DISCOVERED" /> <data android:mimeType="text/plain" /> </intent-filter> <!--<meta-data android:name="android.nfc.action.TECH_DISCOVERED" android:resource="@xml/nfc_tech_filter" />--> </activity> </application></manifest>package cn.com.jslh.zjcdprogrect.saoka;import android.app.PendingIntent;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.nfc.NfcAdapter;import android.nfc.Tag;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import cn.com.jslh.zjcdprogrect.R;public class WorkActivity extends AppCompatActivity { private NfcAdapter mNfcAdapter; private PendingIntent pi; private IntentFilter tagDetected; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_work); //初始化NfcAdapter mNfcAdapter = NfcAdapter.getDefaultAdapter(this); //初始化PendingIntent // 初始化PendingIntent，当有NFC设备连接上的时候，就交给当前Activity处理 pi = PendingIntent.getActivity(this, 0, new Intent(this, getClass()) .addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0); // 新建IntentFilter，使用的是第二种的过滤机制// tagDetected = new IntentFilter(NfcAdapter.ACTION_TECH_DISCOVERED);// tagDetected.addCategory(Intent.CATEGORY_DEFAULT); } @Override protected void onNewIntent(Intent intent) { super.onNewIntent(intent); // 当前app正在前端界面运行，这个时候有intent发送过来，那么系统就会调用onNewIntent回调方法，将intent传送过来 // 我们只需要在这里检验这个intent是否是NFC相关的intent，如果是，就调用处理方法 if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(intent.getAction())) { processIntent(intent); } } @Override protected void onResume() { super.onResume(); mNfcAdapter.enableForegroundDispatch(this, pi, null, null); } /** * Parses the NDEF Message from the intent and prints to the TextView */ private void processIntent(Intent intent) { //取出封装在intent中的TAG Tag tagFromIntent = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG); String CardId =ByteArrayToHexString(tagFromIntent.getId()); } public static void startActivity(Context context){ Intent intent = new Intent(); intent.setClass(context,WorkActivity.class); context.startActivity(intent); } 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; }}

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