Android NFC读MifareClassic卡获取卡片ID 类型扇区存储空间

1.首先要在AndroidManifest.xml中声明如下配置信息：

为了能够使用Android手机的NFC功能，需要在Manifest文件中添加相应的权限：

详细配置请参考-->Android NFC标签读写配置过滤器总结

<uses-permission android:name="android.permission.NFC" />
<uses-sdk android:minSdkVersion="14" android:targetSdkVersion="21" />
<uses-feature android:name="android.hardware.nfc" android:required="true" />

2.NFC TAG的发布系统：

当android设备扫描到一个NFC标签时，会自动寻找最适合的Activity来处理这个TAG，如果有多个Activity满足条件的话，会让用户来选择到底使用哪一个Activity来处理，可以理解为就是简单的事件响应与事件处理。

那么如何让一个Activity监听 ”当扫描到NFC标签时” 的这一个事件呢？使用intent filter。

可以理解为当检测到一个NFC标签时，系统自动创建一个相关Intent对象，含有响应intent-filter的Activity将处理这个Intent。

其中，intent filter声明如下：（在AndroidManifest.xml中声明在你需要捕获这个Intent的Activity里）（如下是识别公交卡的TECH格式过滤标签）即ACTION_TECH_DISCOVERED类型的过滤器：

<activity android:name=".NFCActivity"  android:launchMode="singleInstance"><intent-filter><action android:name="android.nfc.action.TECH_DISCOVERED" /></intent-filter><meta-dataandroid:name="android.nfc.action.TECH_DISCOVERED"android:resource="@xml/nfc_tech_filter" />
</activity>

配置android:name=".NFCActivity"是为了当退出app时只要扫描卡片能直接打开app并定位到NFC扫描界面。

在res文件夹下新建一个xml的文件夹，里面放的是Android支持的NFC类型的配置数据。nfc_tech_filter.xml如下：

<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2"><!-- 可以处理所有Android支持的NFC类型 --><tech-list><tech>android.nfc.tech.IsoDep</tech></tech-list><tech-list><tech>android.nfc.tech.NfcA</tech></tech-list><tech-list><tech>android.nfc.tech.NfcB</tech></tech-list><tech-list><tech>android.nfc.tech.NfcF</tech></tech-list><tech-list><tech>android.nfc.tech.NfcV</tech></tech-list><tech-list><tech>android.nfc.tech.Ndef</tech></tech-list><tech-list><tech>android.nfc.tech.NdefFormatable</tech></tech-list><tech-list><tech>android.nfc.tech.MifareUltralight</tech></tech-list><tech-list><tech>android.nfc.tech.MifareClassic</tech></tech-list>
</resources>

另外还有ACTION_NDEF_DISCOVERED类型的过滤器

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

ACTION_TAG_DISCOVERED类型的过滤器

<intent-filter><action android:name="android.nfc.action.TAG_DISCOVERED"/><category android:name="android.intent.category.DEFAULT"/>
</intent-filter>

3.详细代码如下：

res/layout/nfc_info.xml

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:background="@color/app_background">
<LinearLayout android:orientation="vertical" android:layout_width="match_parent"android:layout_height="wrap_content"><AbsoluteLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:layout_marginBottom="10dp"android:clickable="true"><TextView android:layout_width="match_parent"android:layout_height="wrap_content"android:padding="10dp"android:textSize="@dimen/enfore_title"android:textColor="@color/enfore_title"android:layout_x="0dp"android:layout_y="0dp"android:text="NFC测试"android:gravity="center"/><com.golden.test.iconfont.IconFontTextview     android:layout_width="wrap_content"android:layout_height="wrap_content"android:textSize="@dimen/enfore_title"android:textColor="@drawable/back_btn"android:paddingTop="15dp"android:paddingLeft="10dp"android:text=""android:clickable="true"android:gravity="left|center_vertical"android:layout_x="0dp"android:layout_y="0dp"android:onClick="btn_back"/></AbsoluteLayout><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="vertical"android:layout_margin="5dp"><TextView android:id="@+id/promt"android:layout_width="wrap_content"android:layout_height="wrap_content"android:textColor="@color/enfore_title"android:text="NFC扫描中..."android:textSize="@dimen/app_info"/></LinearLayout></LinearLayout>
</ScrollView>

NFCActivity.java

import android.app.Activity;
import android.app.PendingIntent;
import android.content.Intent;
import android.nfc.NfcAdapter;
import android.nfc.Tag;
import android.nfc.tech.MifareClassic;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;public class NFCActivity extends Activity {NfcAdapter nfcAdapter;TextView promt;private PendingIntent pi;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.nfc_info);promt = (TextView) findViewById(R.id.promt);// 获取默认的NFC控制器nfcAdapter = NfcAdapter.getDefaultAdapter(this);pi = PendingIntent.getActivity(this, 0, new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);if (nfcAdapter == null) {Toast.makeText(this, "对不起,您的设备不支持nfc功能！", Toast.LENGTH_SHORT).show();//promt.setText("设备不支持NFC！");finish();return;}if (!nfcAdapter.isEnabled()) {Toast.makeText(this, "请在系统设置中开启NFC功能！", Toast.LENGTH_SHORT).show();//promt.setText("请在系统设置中先启用NFC功能！");finish();return;}}public void btn_back(View view){this.finish();}@Overrideprotected 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);}}//页面获取焦点@Overrideprotected void onResume() {super.onResume();nfcAdapter.enableForegroundDispatch(this, pi, null, null);}//页面失去焦点@Overrideprotected void onPause() {super.onPause();if(nfcAdapter!=null){nfcAdapter.disableForegroundDispatch(this);//关闭前台发布系统}}/*@Overrideprotected void onResume() {super.onResume();//得到是否检测到ACTION_TECH_DISCOVERED触发if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(getIntent().getAction())) {//处理该intentprocessIntent(getIntent());}}*///字符序列转换为16进制字符串private String bytesToHexString(byte[] src) {StringBuilder stringBuilder = new StringBuilder("0x");if (src == null || src.length <= 0) {return null;}char[] buffer = new char[2];for (int i = 0; i < src.length; i++) {buffer[0] = Character.forDigit((src[i] >>> 4) & 0x0F, 16);buffer[1] = Character.forDigit(src[i] & 0x0F, 16);System.out.println(buffer);stringBuilder.append(buffer);}return stringBuilder.toString();}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;}/*** 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TAGTag tagFromIntent = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);String CardId =ByteArrayToHexString(tagFromIntent.getId());String metaInfo = "";metaInfo+="卡片ID:"+CardId;for (String tech : tagFromIntent.getTechList()) {System.out.println(tech);}boolean auth = false;//读取TAGMifareClassic mfc = MifareClassic.get(tagFromIntent);try {//Enable I/O operations to the tag from this TagTechnology object.mfc.connect();int type = mfc.getType();//获取TAG的类型int sectorCount = mfc.getSectorCount();//获取TAG中包含的扇区数String typeS = "";switch (type) {case MifareClassic.TYPE_CLASSIC:typeS = "TYPE_CLASSIC";break;case MifareClassic.TYPE_PLUS:typeS = "TYPE_PLUS";break;case MifareClassic.TYPE_PRO:typeS = "TYPE_PRO";break;case MifareClassic.TYPE_UNKNOWN:typeS = "TYPE_UNKNOWN";break;}metaInfo += "\n卡片类型：" + typeS + "\n共" + sectorCount + "个扇区\n共"+ mfc.getBlockCount() + "个块\n存储空间: " + mfc.getSize() + "B\n";for (int j = 0; j < sectorCount; j++) {//Authenticate a sector with key A.auth = mfc.authenticateSectorWithKeyA(j,MifareClassic.KEY_DEFAULT);int bCount;int bIndex;if (auth) {metaInfo += "Sector " + j + ":验证成功\n";// 读取扇区中的块bCount = mfc.getBlockCountInSector(j);bIndex = mfc.sectorToBlock(j);for (int i = 0; i < bCount; i++) {byte[] data = mfc.readBlock(bIndex);metaInfo += "Block " + bIndex + " : "+ bytesToHexString(data) + "\n";bIndex++;}} else {metaInfo += "Sector " + j + ":验证失败\n";}}promt.setText(metaInfo);//Toast.makeText(this, metaInfo, Toast.LENGTH_SHORT).show();} catch (Exception e) {e.printStackTrace();}}
}

4.运行效果图如下：

本人NFC扫描卡片功能就是参考模仿下面源码完成的。

详细请参考下载源码Eclipse版本-->Android NFC读MifareClassic卡获取卡片ID类型

如果想研究Android NFC源码读取公交卡信息余额和交易记录的

请参考另一篇文章-->Android NFC源码读取公交卡信息余额和交易记录