我是使用ACR或NFC阅读器开发的新手，特别是对于Android。最近我需要使用ACR35，我已经获得了来自this acs official website的SDK和示例。它的工作原理很好。 现在我需要创建一个活动，随时可以检查nfc卡是否被点击。但问题是我不知道如何检测nfc卡何时被点击，我不知道接下来该做什么，而且我无法从示例中找到出路，因为它检测到nfc卡，当我触摸＆＃39;传输＆＃39;按钮，它不会自动执行。 请给我一些示例代码。 谢谢你的回答。
答案 0 :(得分：4)
有点晚了，但它可能对某人有所帮助。 我在git hub上找到了以下项目。它显示了如何从acr35读取标签ID here 。
我已经使用acr35一段时间来阅读标签ID。根据我的经验，Android上有一个有缺陷的设备。我测试了大约10台设备，它只在3 ...
上工作我每秒都读它。它返回最后一张卡的结果，即使它不再存在。因此;每次成功读取都需要重置两次，大约需要6秒钟才能让设备再次处于读取状态...同时要非常小心多线程。
我的实现基于提到的项目 - 添加了简单的锁定，以便在成功读取+完整设备重置后停止查询卡片，filternig同样的uuid，在之前读取后很短的时间内读取：
ACR3x类
import com.acs.audiojack.AudioJackReader;
import android.media.AudioManager;
import sk.tido.util.ByteHex;
import java.util.Date;
/**
* This class allows control of the ACR35 reader sleep state and PICC commands
*/
public class Acr3x {
private Acr3xTransmitter transmitter;
private AudioManager mAudioManager;
private AudioJackReader mReader;
private boolean firstReset = true; /** Is this the first reset of the reader? */
/** APDU command for reading a card's UID */
private final byte[] apdu = { (byte) 0xFF, (byte) 0xCA, (byte) 0x00, (byte) 0x00, (byte) 0x00 };
/** Timeout for APDU response (in <b>seconds</b>) */
private final int timeout = 1;
private int acr3xCardType = AudioJackReader.PICC_CARD_TYPE_ISO14443_TYPE_A
| AudioJackReader.PICC_CARD_TYPE_ISO14443_TYPE_B
| AudioJackReader.PICC_CARD_TYPE_FELICA_212KBPS
| AudioJackReader.PICC_CARD_TYPE_FELICA_424KBPS
| AudioJackReader.PICC_CARD_TYPE_AUTO_RATS;
private int acr3xStartAudioLevel = 0;
private Object locking = new Object();
private String lastUuid = "";
private Date lastUuidDate = new Date();
public Acr3x(AudioManager mAudioManager){
this.mAudioManager = mAudioManager;
}
public void start(final Acr3xNotifListener listener){
Runnable r = new Runnable(){
@Override
public void run() {
if(mReader == null){
mReader = new AudioJackReader(mAudioManager);
}
System.out.println("ACR35 reader start");
acr3xStartAudioLevel = mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
System.out.println("acr3x start audio stream level: " + acr3xStartAudioLevel);
mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC,
mAudioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC), 0);
System.out.println("acr3x set audio stream level: " + mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC));
mReader.start();
mReader.setSleepTimeout(30);
mReader.setOnFirmwareVersionAvailableListener(new AudioJackReader.OnFirmwareVersionAvailableListener() {
@Override
public void onFirmwareVersionAvailable(AudioJackReader reader,
String firmwareVersion) {
System.out.println("acr3x firmware version: " + firmwareVersion);
if(listener != null){
listener.onFirmwareVersionAvailable(firmwareVersion);
}
Acr3x.this.read(listener);
}
});
mReader.reset(new AudioJackReader.OnResetCompleteListener(){
@Override
public void onResetComplete(AudioJackReader arg0) {
mReader.getFirmwareVersion();
}
});
}
};
Thread t = new Thread(r, "Acr3xInitThread");
t.start();
}
/**
* Sets the ACR35 reader to continuously poll for the presence of a card. If a card is found,
* the UID will be returned to the Apache Cordova application
*
* @param callbackContext: the callback context provided by Cordova
* @param cardType: the integer representing card type
*/
public void read(final Acr3xNotifListener callbackContext){
System.out.println("acr3x setting up for reading...");
firstReset = true;
/* Set the PICC response APDU callback */
mReader.setOnPiccResponseApduAvailableListener
(new AudioJackReader.OnPiccResponseApduAvailableListener() {
@Override
public void onPiccResponseApduAvailable(AudioJackReader reader,
byte[] responseApdu) {
/* Update the connection status of the transmitter */
transmitter.updateStatus(true);
/* Print out the UID */
String uuid = ByteHex.bytesToHex(responseApdu);
if(uuid.equalsIgnoreCase("0x9000")){
return;
}
if(uuid.endsWith("9000")){
uuid = uuid.substring(0, uuid.length() - 4);
}
if(uuid.equals(lastUuid)){ // na odfiltrovanie opakujucich sa uuid z citacky z predchadzajuceho citania
if(new Date().getTime() - lastUuidDate.getTime() < 3000){
return;
}
}
lastUuid = uuid;
lastUuidDate = new Date();
synchronized(locking){
System.out.println("acr3x uuid: " + uuid);
if(callbackContext != null){
callbackContext.onUUIDAavailable(uuid);
}
System.out.println("acr3x restarting reader");
transmitter.kill();
try {
locking.wait(2000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
read(callbackContext);
}
});
/* Set the reset complete callback */
mReader.setOnResetCompleteListener(new AudioJackReader.OnResetCompleteListener() {
@Override
public void onResetComplete(AudioJackReader reader) {
System.out.println("acr3x reset complete");
/* If this is the first reset, the ACR35 reader must be turned off and back on again
to work reliably... */
Thread t = null;
if(firstReset){ //firstReset
t = new Thread(new Runnable() {
public void run() {
try{
/* Set the reader asleep */
mReader.sleep();
/* Wait one second */
Thread.sleep(500);
/* Reset the reader */
mReader.reset();
firstReset = false;
} catch (InterruptedException e) {
e.printStackTrace();
// TODO: add exception handling
}
}
});
} else {
/* Create a new transmitter for the UID read command */
transmitter = new Acr3xTransmitter(mReader, mAudioManager, timeout,
apdu, acr3xCardType, locking);
t = new Thread(transmitter);
}
t.start();
}
});
mReader.start();
mReader.reset();
System.out.println("acr3x setup complete");
}
public void stop(){
if(transmitter != null){
transmitter.kill();
}
System.out.println("acr3x restoring audio level: " + acr3xStartAudioLevel);
mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC,acr3xStartAudioLevel, 0);
System.out.println("acr3x set audio stream level: " + mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC));
if(mReader != null){
mReader.stop();
}
}
}
发射器类
import com.acs.audiojack.AudioJackReader;
import android.media.AudioManager;
/**
* This class sets up an independent thread for card polling, and is linked to the
* <code>setOnPiccResponseApduAvailableListener</code> callback function
*/
public class Acr3xTransmitter implements Runnable {
private AudioJackReader mReader;
private AudioManager mAudioManager;
//private CallbackContext mContext;
private boolean killMe = false; /** Stop the polling thread? */
private int itersWithoutResponse = 0; /** The number of iterations that have passed with no
response from the reader */
private boolean readerConnected = true; /** Is the reader currently connected? */
private int cardType;
private int timeout;
private byte[] apdu;
private Object locking;
/**
* @param mReader: AudioJack reader service
* @param mAudioManager: system audio service
* @param mContext: context for plugin results
* @param timeout: time in <b>seconds</b> to wait for commands to complete
* @param apdu: byte array containing the command to be sent
* @param cardType: the integer representing card type
*/
public Acr3xTransmitter(AudioJackReader mReader, AudioManager mAudioManager,
int timeout, byte[] apdu, int cardType, Object locking){
this.mReader = mReader;
this.mAudioManager = mAudioManager;
this.timeout = timeout;
this.apdu = apdu;
this.cardType = cardType;
this.locking = locking;
}
/**
* Stops the polling thread
*/
public void kill(){
killMe = true;
}
/**
* Updates the connection status of the reader (links to APDU response callback)
*/
public void updateStatus(boolean status){
readerConnected = status;
}
/**
* Sends the APDU command for reading a card UID every second
*/
@Override
public void run() {
try {
/* Wait one second for stability */
Thread.sleep(1000);
while (!killMe) {
synchronized(locking){
if(killMe){
continue;
}
/* If the reader is not connected, increment no. of iterations without response */
if(!readerConnected){
itersWithoutResponse++;
}
/* Else, reset the number of iterations without a response */
else{
itersWithoutResponse = 0;
}
/* Reset the connection state */
readerConnected = false;
if(itersWithoutResponse == 4) {
/* Communicate to the Cordova application that the reader is disconnected */
System.out.println("acr3x disconnected");
/* Kill this thread */
kill();
} else if(!mAudioManager.isWiredHeadsetOn()) {
System.out.println("acr3x not connected");
/* Kill this thread */
kill();
} else{
System.out.println("acr3x reading...");
/* Power on the PICC */
mReader.piccPowerOn(timeout, cardType);
/* Transmit the APDU */
mReader.piccTransmit(timeout, apdu);
}
}
/* Repeat every second */
Thread.sleep(1000);
}
/* Power off the PICC */
mReader.piccPowerOff();
/* Set the reader asleep */
mReader.sleep();
/* Stop the reader service */
mReader.stop();
synchronized(locking){
locking.notifyAll();
}
} catch (InterruptedException e) {
e.printStackTrace();
// TODO: add exception handling
}
}
}
监听器接口：
public interface Acr3xNotifListener {
public void onUUIDAavailable(String uuid);
public void onFirmwareVersionAvailable(String firmwareVersion);
}
答案 1 :(得分：0)
首先调用Reset命令激活设备。由于设备将入睡（默认情况下为4秒）*诀窍是保持它活着。
您可以通过每次上一次PowerOn timedOut重新启动新的PowerOn命令来实现这一点。像这样的东西
void powerOn () {
if (!mReader.piccPowerOn(mPiccTimeout, mPiccCardType)) {
powerOn();
} else {
askNfcForItsId();
}
在你读完nfc之后别忘了给powerOn打电话，否则它会在第一张nfc卡后睡着。
*重置超时可以设置为4到20秒