當前位置：首頁 > 运维知识 > Android >内容正文

Android

Android NFC开发

發布時間：2024/2/28 Android 28 豆豆

生活随笔收集整理的這篇文章主要介紹了 Android NFC开发小編覺得挺不錯的,現在分享給大家,幫大家做個參考.

由于工作關系，需要做智能卡(JavaCard Applet)和Android NFC方面的開發。

NFC主要有3種模式：讀卡器模式，卡模擬模式，點到點模式。

本文主要參考了Android官方CardEmulation例子，描述如何實現HCE(主機卡模擬)。

開發前提條件：需要1部支持NFC的手機和一部非接讀寫器

首先使用AS創建一個工程.

在AndroidManifest.xml文件中添加以下代碼

描述所需硬件特性

<uses-feature android:name="android.hardware.nfc.hce" android:required="true" /> 描述應用所需的權限 <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><action android:name="android.nfc.cardemulation.action.HOST_APDU_SERVICE"/><category android:name="android.intent.category.DEFAULT"/></intent-filter> <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"> <aid-group android:description="@string/card_title" android:category="other"><aid-filter android:name="A00000000386980700"/></aid-group></host-apdu-service> service代碼類 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);由于遷涉到交通卡結構內容、密鑰處理等保密協議，無法公開整個工程。但是整個流程還是比較簡單的，無法就是接收到請求，然后調用遠程或本地服務進行業務處理，最后返回處理結果的APDU.使用HCE的最大好處就是不需要使用NFC-SIM或者eSE，不會受制于移動運營商和手機廠商。

總結

以上是生活随笔為你收集整理的Android NFC开发的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。

Android
nfc