Android NFC开发

由于工作关系，需要做智能卡(JavaCard Applet)和Android NFC方面的开发。

NFC主要有3种模式：读卡器模式，卡模拟模式，点到点模式。

本文主要参考了Android官方CardEmulation例子，描述如何实现HCE(主机卡模拟)。

开发前提条件：需要1部支持NFC的手机和一部非接读写器

首先使用AS创建一个工程.

在AndroidManifest.xml文件中添加以下代码

描述所需硬件特性

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

描述应用所需的权限
<uses-permission android:name="android.permission.NFC" />
<uses-permission android:name="android.permission.INTERNET"/>

添加Service

<service android:name=".CardService"
    android:exported="true"
    android:permission="android.permission.BIND_NFC_SERVICE"><!-- Intent filter indicating that we support card emulation. -->
    <intent-filter><action android:name="android.nfc.cardemulation.action.HOST_APDU_SERVICE"/><category android:name="android.intent.category.DEFAULT"/></intent-filter><!-- Required XML configuration file, listing the AIDs that we are emulating cards
         for. This defines what protocols our card emulation service supports. -->
    <meta-data android:name="android.nfc.cardemulation.host_apdu_service"
        android:resource="@xml/aid_list"/>
</service>

aid_list.xml文件

<host-apdu-service xmlns:android="http://schemas.android.com/apk/res/android"
    android:description="@string/service_name"
    android:requireDeviceUnlock="false"><!--
    If category="payment" is used for any aid-groups, you must also add an android:apduServiceBanner
    attribute above, like so:

    android:apduServiceBanner="@drawable/settings_banner"

     apduServiceBanner should be 260x96 dp. In pixels, that works out to...
       - drawable-xxhdpi: 780x288 px
       - drawable-xhdpi:  520x192 px
       - drawable-hdpi:   390x144 px
       - drawable-mdpi:   260x96  px

    The apduServiceBanner is displayed in the "Tap & Pay" menu in the system Settings app, and
    is only displayed for apps which implement the "payment" AID category.

    Since this sample is implementing a non-standard card type (a loyalty card, specifically), we
    do not need to define a banner.

    Important: category="payment" should only be used for industry-standard payment cards. If you are
        implementing a closed-loop payment system (e.g. stored value cards for a specific merchant
        or transit system), use category="other". This is because only one "payment" card may be
        active at a time, whereas all "other" cards are active simultaneously (subject to AID
        dispatch).
    -->

    <aid-group android:description="@string/card_title" android:category="other"><aid-filter android:name="A00000000386980700"/></aid-group></host-apdu-service>

service代码类

public class CardService extends HostApduService {

/**
 * Called if the connection to the NFC card is lost, in order to let the application know the
 * cause for the disconnection (either a lost link, or another AID being selected by the
 * reader).
 *
 * @param reason Either DEACTIVATION_LINK_LOSS or DEACTIVATION_DESELECTED
 */
@Override
public void onDeactivated(int reason) {Logger.i("onDeactivated reason:" + reason);
}

/**
 * This method will be called when a command APDU has been received from a remote device. A
 * response APDU can be provided directly by returning a byte-array in this method. In general
 * response APDUs must be sent as quickly as possible, given the fact that the user is likely
 * holding his device over an NFC reader when this method is called.
 *
 * <p class="note">If there are multiple services that have registered for the same AIDs in
 * their meta-data entry, you will only get called if the user has explicitly selected your
 * service, either as a default or just for the next tap.
 *
 * <p class="note">This method is running on the main thread of your application. If you
 * cannot return a response APDU immediately, return null and use the {@link
 * #sendResponseApdu(byte[])} method later.
 *
 * @param commandApdu The APDU that received from the remote device
 * @param extras A bundle containing extra data. May be null.
 * @return a byte-array containing the response APDU, or null if no response APDU can be sent
 * at this point.
 */
// BEGIN_INCLUDE(processCommandApdu)
@Override
public byte[] processCommandApdu(byte[] commandApdu, Bundle extras) {Logger.i("Received APDU: " + ByteArrayToHexString(commandApdu));byte cla = commandApdu[0];byte ins = commandApdu[1];//
    switch (ins){case (byte)0xA4:select(commandApdu);break;case (byte)0xCA:getMessage(commandApdu);break;case (byte)0xB0:readBinary(commandApdu);break;case (byte)0x5c:getBalance(commandApdu);break;case (byte)0x50:purchaseInit(commandApdu);break;case (byte)0xDC:updateRecord(commandApdu);break;case (byte)0x54:purchase(commandApdu);break;default:}//要么返回GetResponse

    Logger.d("processCommandApdu return null");return null;
}

返回apdu使用方法

sendResponseApdu(responseApdu);

由于迁涉到交通卡结构内容、密钥处理等保密协议，无法公开整个工程。但是整个流程还是比较简单的，无法就是接收到请求，然后调用远程或本地服务进行业务处理，最后返回处理结果的APDU.

使用HCE的最大好处就是不需要使用NFC-SIM或者eSE，不会受制于移动运营商和手机厂商。

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