NFC手机读特定磁卡

NFC的出现让移动平台充满了幻想，ios还没有支持，但是android平台已经成了旗舰机的必备功能，很有幸公司的项目中也用到了NFC，只是从特定的NFC卡里面读取一个卡的ID，每个应用只能有一个NFC入口，所以当一个应用多出用到NFC功能跳转的话，只能写在一个Activity中，解析到数据后决定往哪里跳。下面就给出代码：

首先是AndroidManifest中对NFC的Activity的配置

   <activity            android:name=".NFCActivity"            android:configChanges="screenSize|keyboardHidden|orientation"            android:launchMode="singleTask"            android:screenOrientation="portrait" >            <intent-filter>                <action android:name="android.nfc.action.TECH_DISCOVERED" />            </intent-filter>            <meta-data                android:name="android.nfc.action.TECH_DISCOVERED"                android:resource="@xml/nfc_tech_filter" />        </activity>

nfc_tech_filter.xml

<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">    <tech-list>       <tech>android.nfc.tech.MifareClassic</tech>    </tech-list></resources>

然后是NFCActivity

/** * NFC响应页面 *  * @author Jinyang *  */public class NFCActivity extends BaseActivity {public static final String TAG = "NFCActivity";private NfcAdapter nfcAdapter;private String mClientCardNfcId;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_nfc);initNfcParse();}private void initNfcParse() {nfcAdapter = NfcAdapter.getDefaultAdapter(this);if (nfcAdapter == null) {AppContext.showLog("---->Nfc error ！！！");Toast.makeText(getApplicationContext(), "不支持NFC功能！",Toast.LENGTH_SHORT).show();} else if (!nfcAdapter.isEnabled()) {AppContext.showLog("---->Nfc close ！！！");Toast.makeText(getApplicationContext(), "请打开NFC功能！",Toast.LENGTH_SHORT).show();}}@Overrideprotected void onResume() {super.onResume();AppContext.showLog("---->onDestroy");if (NfcAdapter.ACTION_TECH_DISCOVERED.equals(getIntent().getAction())) {Tag tagFromIntent = getIntent().getParcelableExtra(NfcAdapter.EXTRA_TAG);MifareClassic mfc = MifareClassic.get(tagFromIntent);try {mfc.connect();byte[] byteId = mfc.getTag().getId();String nfcId = StringUtils.hexToHexString(byteId);if (!nfcId.isEmpty()) {mClientCardNfcId = nfcId;AppContext.showLog("卡的内容" + mClientCardNfcId);} else {Toast.makeText(this, "识别失败！请重新刷卡！", Toast.LENGTH_SHORT).show();}} catch (Exception e) {AppContext.showLog("error = " + e.getMessage());e.printStackTrace();}}}}

工具类解析:

public static String hexToHexString(byte[] b) {int len = b.length;int[] x = new int[len];String[] y = new String[len];StringBuilder str = new StringBuilder();int j = 0;for (; j < len; j++) {x[j] = b[j] & 0xff;y[j] = Integer.toHexString(x[j]);while (y[j].length() < 2) {y[j] = "0" + y[j];}str.append(y[j]);str.append("");}return new String(str).toUpperCase(Locale.getDefault());}

NFC与现有非接触智能卡技术兼容，目前已经成为得到越来越多主要厂商支持的正式标准。有了NFC通过手机能够获取非电子设备的信息是不是充满了幻想，生活中有太多这样的需求，手机应用强大的可自定义的数据分析功能，加上NFC简单方便的获取信息能力，我感觉有很多东西又要发生革新了。