我想编写一个程序,可以存储唯一的ID,然后将其作为NFC标签发送到另一个NFC读卡器设备。如何将我的代码(nfcTag
)发送到NFC阅读器?我可以在没有申请AID的情况下这样做吗?
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
PackageManager pm = this.getPackageManager();
String nfcTag="123456789"; //the code wants to work as NFC tag
TextView msg = (TextView) findViewById(R.id.txtShow);
byte[] t2 = new byte[9]; //t2 return from processCommandApdu
t2 = nfcTag.getBytes();
@Override
public byte[] processCommandApdu(byte[] apdu, Bundle extras) {
msg.setText(nfcTag);
return t2; //return nfcTag too read with NFC tag reader devices
}
@Override
public void onDeactivated(int reason) {
msg.setText("Your phone does not has HCE hardware.");
if (!pm.hasSystemFeature(PackageManager.FEATURE_NFC_HOST_CARD_EMULATION)) {
// HCE is not available on the device.
Toast.makeText(this, "The device does not has HCE hardware.",
Toast.LENGTH_SHORT).show();
}
else {
Toast.makeText(this, "HCE supported on your device.",
Toast.LENGTH_SHORT).show();
}
}
}
}
这是AndroidManifest.xml
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<service android:name=".MyHostApduService" android:exported="true"
android:permission="android.permission.BIND_NFC_SERVICE">
<intent-filter>
<action android:name="android.nfc.cardemulation.action.HOST_APDU_SERVICE"/>
</intent-filter>
</service>
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
对于Android HCE,您首先需要创建一个服务组件(这是一个单独的类,而不是您的活动的一部分):
public class MyHostApduService extends HostApduService {
@Override
public byte[] processCommandApdu(byte[] apdu, Bundle extras) {
// TODO: process the incoming APDU command(s) and give reasonable responses
}
@Override
public void onDeactivated(int reason) {
}
}
智能卡读卡器(实际上是通过它们访问卡的软件)使用ISO / IEC 7816-4 APDU命令序列与(仿真的)非接触式智能卡进行通信。因此,您的HCE服务需要处理这些APDU并为读者创建适当的响应。此命令序列至少包含用于选择HCE服务的SELECT(按AID)命令。您应该使用状态字9000
(即new byte[] { (byte)0x90, (byte)0x00 }
)以及可选的文件控制信息结构来响应该SELECT命令。
您还需要为HCE服务定义AID过滤器:
<service android:name=".MyHostApduService" android:exported="true"
android:permission="android.permission.BIND_NFC_SERVICE">
<intent-filter>
<action android:name="android.nfc.cardemulation.action.HOST_APDU_SERVICE"/>
</intent-filter>
<meta-data android:name="android.nfc.cardemulation.host_apdu_service"
android:resource="@xml/apduservice"/>
</service>
在res/xml/apduservice.xml
:
<host-apdu-service xmlns:android="http://schemas.android.com/apk/res/android"
android:description="My HCE Service"
android:requireDeviceUnlock="false">
<aid-group android:description="My HCE Service" android:category="other">
<aid-filter android:name="F0010203040506"/>
</aid-group>
</host-apdu-service>
将AID F0010203040506
替换为您的读卡器(软件)用于访问(仿真)智能卡上的应用程序的任何内容。
你不能用Android HCE做什么: