如何使用 MagTek 读卡器设备的 sdk for android？

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【中文标题】如何使用 MagTek 读卡器设备的 sdk for android？【英文标题】：How to use MagTek card reader device's sdk for android? 【发布时间】：2017-02-04 14:19:26 【问题描述】：

我正在使用 magtek 读卡器音频 uDynamo 设备，并且正在将 sdk 与我的 android 应用程序集成。但是当我试图通过 openDevice() 方法打开设备时。申请不幸停止。为什么会这样？

这就是我正在做的事情

            m_SCRA.setConnectionType(MTConnectionType.Audio);

            m_SCRA.setAddress(m_deviceAddress);

            m_connectionState = MTConnectionState.Connected;
            // here its stopping
            m_SCRA.openDevice();

完整的源代码

         public class MainActivity extends AppCompatActivity 

private MTSCRA m_SCRA;
private Button btn;
private TextView txt;
private TextView txt1;
private TextView msg;
private TextView msg2;
private boolean m_startTransactionActionPending;
private boolean m_turnOffLEDPending;
private EditText Edit;
private AudioManager m_audioManager;
private int m_audioVolume;
private String m_deviceAddress;
private MTConnectionType m_connectionType;
private MTConnectionState m_connectionState = MTConnectionState.Disconnected;
private Handler m_scraHandler = new Handler(new SCRAHandlerCallback());

private class SCRAHandlerCallback implements Handler.Callback 
    public boolean handleMessage(Message msg)
    
        try
        
            android.app.AlertDialog alertDialog = new android.app.AlertDialog.Builder(MainActivity.this).create();
            alertDialog.setTitle("Alert");
            alertDialog.setMessage("Alert Switch");
            alertDialog.setButton(android.app.AlertDialog.BUTTON_NEUTRAL, "OK",
                    new DialogInterface.OnClickListener() 
                        public void onClick(DialogInterface dialog, int which) 
                            dialog.dismiss();
                        
                    );
            alertDialog.show();

            switch (msg.what)
            

                case MTSCRAEvent.OnDeviceConnectionStateChanged:
                    OnDeviceStateChanged((MTConnectionState) msg.obj);
                    break;
                case MTSCRAEvent.OnCardDataStateChanged:
                    OnCardDataStateChanged((MTCardDataState) msg.obj);
                    break;
                case MTSCRAEvent.OnDataReceived:
                    OnCardDataReceived((IMTCardData) msg.obj);
                    break;
                case MTSCRAEvent.OnDeviceResponse:
                    OnDeviceResponse((String) msg.obj);
                    break;
                case MTEMVEvent.OnTransactionStatus:
                    OnTransactionStatus((byte[]) msg.obj);
                    break;
                case MTEMVEvent.OnDisplayMessageRequest:
                    OnDisplayMessageRequest((byte[]) msg.obj);
                    break;
                case MTEMVEvent.OnUserSelectionRequest:
                    OnUserSelectionRequest((byte[]) msg.obj);
                    break;
                case MTEMVEvent.OnARQCReceived:
                    OnARQCReceived((byte[]) msg.obj);
                    break;
                case MTEMVEvent.OnTransactionResult:
                    OnTransactionResult((byte[]) msg.obj);
                    break;

                case MTEMVEvent.OnEMVCommandResult:
                    OnEMVCommandResult((byte[]) msg.obj);
                    break;

                case MTEMVEvent.OnDeviceExtendedResponse:
                    OnDeviceExtendedResponse((String) msg.obj);
                    break;
            
        
        catch (Exception ex)
        

        

        return true;
    

public void OnCardDataReceived(IMTCardData cardData)

    txt.setText(m_SCRA.getCardLast4());

protected void OnDeviceStateChanged(MTConnectionState deviceState)

    setState(deviceState);
    updateDisplay();
    invalidateOptionsMenu();
    android.app.AlertDialog alertDialog = new android.app.AlertDialog.Builder(MainActivity.this).create();
    alertDialog.setTitle("Alert");
    alertDialog.setMessage("Alert ondevice state");
    alertDialog.setButton(android.app.AlertDialog.BUTTON_NEUTRAL, "OK",
            new DialogInterface.OnClickListener() 
                public void onClick(DialogInterface dialog, int which) 
                    dialog.dismiss();
                
            );
    alertDialog.show();

    switch (deviceState)
    
        case Disconnected:
            if (m_connectionType == MTConnectionType.Audio)
            
                restoreVolume();
            
            break;
        case Connected:
            if (m_connectionType == MTConnectionType.Audio)
            
                setVolumeToMax();
            
            clearMessage();
            clearMessage2();
            break;
        case Error:
            sendToDisplay("[Device State Error]");
            break;
        case Connecting:
            break;
        case Disconnecting:
            break;
    

protected void OnCardDataStateChanged(MTCardDataState cardDataState)

    switch (cardDataState)
    
        case DataNotReady:
            sendToDisplay("[Card Data Not Ready]");
            break;
        case DataReady:
            sendToDisplay("[Card Data Ready]");
            break;
        case DataError:
            sendToDisplay("[Card Data Error]");
            break;
    


protected void OnDeviceResponse(String data)

    sendToDisplay("[Device Response]");

    sendToDisplay(data);

    if (m_startTransactionActionPending)
    
        m_startTransactionActionPending = false;

        startTransaction();
    


protected void OnTransactionStatus(byte[] data)

    sendToDisplay("[Transaction Status]");

    //sendToDisplay(TLVParser.getHexString(data));


protected void OnDisplayMessageRequest(byte[] data)

    sendToDisplay("[Display Message Request]");

    //String message = TLVParser.getTextString(data, 0);

    //sendToDisplay(message);

    //displayMessage(message);


protected void OnEMVCommandResult(byte[] data)

    sendToDisplay("[EMV Command Result]");

    //sendToDisplay(TLVParser.getHexString(data));

    if (m_turnOffLEDPending)
    
        m_turnOffLEDPending = false;

        setLED(false);
    


protected void OnDeviceExtendedResponse(String data)

    sendToDisplay("[Device Extended Response]");

    sendToDisplay(data);

protected void OnUserSelectionRequest(byte[] data)

    sendToDisplay("[User Selection Request]");

    //sendToDisplay(TLVParser.getHexString(data));

    //processSelectionRequest(data);

protected void OnARQCReceived(byte[] data)

    sendToDisplay("[ARQC Received]");

    /*sendToDisplay(TLVParser.getHexString(data));

    List<HashMap<String, String>> parsedTLVList = TLVParser.parseEMVData(data, true, "");

    if (parsedTLVList != null)
    
        String deviceSNString = TLVParser.getTagValue(parsedTLVList, "DFDF25");
        byte[] deviceSN = TLVParser.getByteArrayFromHexString(deviceSNString);

        sendToDisplay("SN Bytes=" + deviceSNString);
        sendToDisplay("SN String=" + TLVParser.getTextString(deviceSN, 2));

        boolean approved = true;

        if (mMainMenu != null)
        
            approved = mMainMenu.findItem(R.id.menu_emv_approved).isChecked();
        

        byte[] response = buildAcquirerResponse(deviceSN, approved);

        setAcquirerResponse(response);
    */

protected void OnTransactionResult(byte[] data)

    sendToDisplay("[Transaction Result]");

    //sendToDisplay(TLVParser.getHexString(data));

    /*if (data != null)
    
        if (data.length > 0)
        
            boolean signatureRequired = (data[0] != 0);

            int lenBatchData = data.length - 3;
            if (lenBatchData > 0)
            
                byte[] batchData = new byte[lenBatchData];

                System.arraycopy(data, 3, batchData, 0, lenBatchData);

                sendToDisplay("(Parsed Batch Data)");

                List<HashMap<String, String>> parsedTLVList = TLVParser.parseEMVData(batchData, false, "");

                displayParsedTLV(parsedTLVList);

                String cidString = TLVParser.getTagValue(parsedTLVList, "9F27");
                byte[] cidValue = TLVParser.getByteArrayFromHexString(cidString);

                boolean approved = false;

                if (cidValue != null)
                
                    if (cidValue.length > 0)
                    
                        if ((cidValue[0] & (byte) 0x40) != 0)
                        
                            approved = true;
                        
                    
                

                if (approved)
                
                    if (signatureRequired)
                    
                        displayMessage2("( Signature Required )");
                    
                    else
                    
                        displayMessage2("( No Signature Required )");
                    
                
            
        
    

    setLED(false);*/


@Override
protected void onCreate(Bundle savedInstanceState)

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    btn = ( Button) findViewById(R.id.btn);
    txt = (TextView) findViewById(R.id.txt1);
    txt1 = (TextView) findViewById(R.id.txt2);
    msg = (TextView) findViewById(R.id.msgtext1);
    msg2 = (TextView) findViewById(R.id.msgtext2);
    Edit = (EditText) findViewById(R.id.editText);


    //m_SCRA.setConnectionType(MTConnectionType.Audio);


   //if (! m_SCRA.isDeviceConnected())
    //
    //      m_SCRA.openDevice();
    //
    m_audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

    m_SCRA = new MTSCRA(this, m_scraHandler);


    btn.setOnClickListener(new View.OnClickListener() 
        @Override
        public void onClick(View view) 
            m_connectionType = MTConnectionType.Audio;

            m_SCRA.setConnectionType(MTConnectionType.Audio);


            m_SCRA.setAddress(m_deviceAddress);

            m_connectionState = MTConnectionState.Connected;
            m_SCRA.openDevice();
        
    );


private void sendToDisplay(final String data)

    if (data != null)
    
        runOnUiThread(new Runnable()
        
            @Override
            public void run()
            
                Edit.append(data + "\n");
            
        );
    


private void setState(MTConnectionState deviceState)

    m_connectionState = deviceState;
    updateDisplay();
    invalidateOptionsMenu();


private void updateDisplay()

    runOnUiThread(new Runnable()
    
        @Override
        public void run()
        
            if (m_connectionState == MTConnectionState.Connected)
            
                updateConnectionState(R.string.connected);
            
            else if (m_connectionState == MTConnectionState.Connecting)
            
                updateConnectionState(R.string.connecting);
            
            else if (m_connectionState == MTConnectionState.Disconnecting)
            
                updateConnectionState(R.string.disconnecting);
            
            else if (m_connectionState == MTConnectionState.Disconnected)
            
                updateConnectionState(R.string.disconnected);
            
        
    );

private void updateConnectionState(final int resourceId)

    runOnUiThread(new Runnable()
    
        @Override
        public void run()
        
            txt1.setText(resourceId);
        
    );

private void restoreVolume()

    setVolume(m_audioVolume);

private void setVolumeToMax()

    saveVolume();
    android.app.AlertDialog alertDialog = new android.app.AlertDialog.Builder(MainActivity.this).create();
    alertDialog.setTitle("Alert");
    alertDialog.setMessage("Alert volume max");
    alertDialog.setButton(android.app.AlertDialog.BUTTON_NEUTRAL, "OK",
            new DialogInterface.OnClickListener() 
                public void onClick(DialogInterface dialog, int which) 
                    dialog.dismiss();
                
            );
    alertDialog.show();

    int volume = m_audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);

    setVolume(volume);

private void setVolume(int volume)

    m_audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, volume, AudioManager.FLAG_SHOW_UI);


private void saveVolume()

    m_audioVolume = m_audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);

private void clearMessage()

    runOnUiThread(new Runnable()
    
        @Override
        public void run()
        
            msg.setText("");
        
    );


private void clearMessage2()

    runOnUiThread(new Runnable()
    
        @Override
        public void run()
        
            msg2.setText("");
        
    );


public void startTransaction()

    if (m_SCRA != null)
    
        byte timeLimit = 0x3C;
        //byte cardType = 0x02;  // Chip Only
        byte cardType = 0x03;  // MSR + Chip
        byte option = 0x00;
        byte[] amount = new byte[] 0x00, 0x00, 0x00, 0x00, 0x15, 0x00;
        byte transactionType = 0x00; // Purchase
        byte[] cashBack = new byte[] 0x00, 0x00, 0x00, 0x00, 0x00, 0x00;
        byte[] currencyCode = new byte[]  0x08, 0x40;
        byte reportingOption = 0x02;  // All Status Changes

        clearMessage();
        clearMessage2();

        int result = m_SCRA.startTransaction(timeLimit, cardType, option, amount, transactionType, cashBack, currencyCode, reportingOption);

        sendToDisplay("[Start Transaction] (Result=" + result + ")");
    

public void setLED(boolean on)

    if (m_SCRA != null)
    
        if (on)
        
            m_SCRA.sendCommandToDevice(MTDeviceConstants.SCRA_DEVICE_COMMAND_STRING_SET_LED_ON);
        
        else
        
            m_SCRA.sendCommandToDevice(MTDeviceConstants.SCRA_DEVICE_COMMAND_STRING_SET_LED_OFF);

【问题讨论】：

Logcat 显示什么错误？ 应用不幸停止工作这个错误.. 不，日志监视器控制台中的错误堆栈跟踪 Logcat 在 java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728) at com.android .internal.os.ZygoteInit.main(ZygoteInit.java:618) 致命异常：Magtek 音频阅读器通信线程进程：com.example.karanveer.cardreaderexample，PID：28348 java.lang.IllegalStateException：startRecording() 在未初始化的 AudioRecord 上调用。 【参考方案1】：

我遇到了同样的问题。原来我忘记了录音运行时权限。

private void checkRecordPermission() 

    if (ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.RECORD_AUDIO)
            != PackageManager.PERMISSION_GRANTED) 

        ActivityCompat.requestPermissions(getActivity(), new String[]Manifest.permission.RECORD_AUDIO,
                123);

【讨论】：

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