nfc过滤标签的设置

1 在Manifest添加权限：

在xml里添加nfc的使用权限

<uses-permission android:name="android.permission.NFC" />

这个是限制安装权限，只给有nfc功能的手机安装(可选)

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

2 nfc的过滤方式有以下：

ACTION_NDEF_DISCOVERED，ACTION_TECH_DISCOVERED，ACTION_TAG_DISCOVERED三种。过滤器的作用是过滤掉杂质，剩下的就是我们需要的了。这三种过滤方式可同时配置，可以比方成从上到下三层，只要是符合某一层过滤器要求的，过滤完就停止往下一层。

在Activity的filter里面添加对应需要的权限：

ACTION_NDEF_DISCOVERED

在<project-root>/res/xml(自己新建xml文件夹)下新建一个nfc_tech_filter.xml文件，添加进你需要支持的标签类型。（下面的配置项可多选）。下列示例是支持与NfcA和Ndef技术的NFC标签匹配。

3 识别标签的顺序

二 nfc读操作（我们读取NEDF数据，其他公交卡类型的数据可以自行研究）

1 初始化nfc工具，判断是否存在nfc和nfc是否打开

2 感应到nfc标签后，读取解析对应nfc类型的标签数据

3 回传显示

package com.example.chenqiuyang.nfcread;import android.annotation.SuppressLint;import android.app.Activity;import android.app.PendingIntent;import android.content.Intent;import android.nfc.NdefMessage;import android.nfc.NdefRecord;import android.nfc.NfcAdapter;import android.nfc.NfcEvent;import android.nfc.Tag;import android.nfc.tech.MifareClassic;import android.nfc.tech.MifareUltralight;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.TextView;import android.widget.Toast;import com.example.chenqiuyang.nfcread.read.ParsedNdefRecord;import com.example.chenqiuyang.nfcread.read.TextRecord;import java.util.Calendar;import java.util.Date;import java.util.List;import java.util.Locale;import java.util.Timer;/*** TODO:功能说明** @author: chenqiuyang* @date: -07-12 11:18*/public class NfcActivity extends Activity {private static final String TAG = "NfcActivity";private TextView tvNFCMessage;private PendingIntent mPendingIntent;private NfcAdapter mNfcAdapter;private Button btnClean;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_nfc);Log.i(TAG, "onCreate: ");btnClean = findViewById(R.id.btn_clean);tvNFCMessage = findViewById(R.id.tv_show_nfc);//初始化nfcmNfcAdapter = NfcAdapter.getDefaultAdapter(this);mPendingIntent = PendingIntent.getActivity(this, 0,new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);if (mNfcAdapter == null) {Toast.makeText(NfcActivity.this, "nfc is not available", Toast.LENGTH_SHORT).show();finish();return;}btnClean.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {tvNFCMessage.setText("");}});}@Overrideprotected void onResume() {super.onResume();Log.i(TAG, "onResume: ");if (mNfcAdapter != null) { //有nfc功能if (mNfcAdapter.isEnabled()) {//nfc功能打开了//隐式启动mNfcAdapter.enableForegroundDispatch(this, mPendingIntent, null, null);} else {Toast.makeText(NfcActivity.this, "请打开nfc功能", Toast.LENGTH_SHORT).show();}}}@Overrideprotected void onNewIntent(Intent intent) {super.onNewIntent(intent);Log.i(TAG, "onNewIntent: ");setIntent(intent);if (mNfcAdapter != null) { //有nfc功能if (mNfcAdapter.isEnabled()) {//nfc功能打开了resolveIntent(getIntent());} else {Toast.makeText(NfcActivity.this, "请打开nfc功能", Toast.LENGTH_SHORT).show();}}}@Overrideprotected void onPause() {super.onPause();if (mNfcAdapter != null) {mNfcAdapter.disableForegroundDispatch(this);}}//初次判断是什么类型的NFC卡private void resolveIntent(Intent intent) {NdefMessage[] msgs = NfcUtil.getNdefMsg(intent); //重点功能，解析nfc标签中的数据if (msgs == null) {Toast.makeText(NfcActivity.this, "非NFC启动", Toast.LENGTH_SHORT).show();} else {setNFCMsgView(msgs);}}/*** 显示扫描后的信息** @param ndefMessages ndef数据*/@SuppressLint("SetTextI18n")private void setNFCMsgView(NdefMessage[] ndefMessages) {if (ndefMessages == null || ndefMessages.length == 0) {return;}// tvNFCMessage.setText("Payload:" + new String(ndefMessages[0].getRecords()[0].getPayload()) + "\n");Calendar calendar = Calendar.getInstance();int hour = calendar.get(Calendar.HOUR_OF_DAY);int minute = calendar.get(Calendar.MINUTE);tvNFCMessage.append(hour + ":" + minute + "\n");List<ParsedNdefRecord> records = NdefMessageParser.parse(ndefMessages[0]);final int size = records.size();for (int i = 0; i < size; i++) {ParsedNdefRecord record = records.get(i);tvNFCMessage.append(record.getViewText() + "\n");}}}

数据读取出来就是这些；

项目源码

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