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| == Overview ==
| | {{Migrating|https://smartpossdk.gitbook.io/cloudpossdk/faq/card/use-contactless-cpu-card}} |
| This section provides a step-by-step guide on using the Java API for interacting with contactless CPU cards.
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| == Steps for Java API Usage ==
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| * '''Get RFCardReaderDevice:'''
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| Retrieve the instance of the RFCardReaderDevice to initiate communication with the contactless card reader.
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| <syntaxhighlight lang="java" line='line'>
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| device = (RFCardReaderDevice) POSTerminal.getInstance(mContext).getDevice(POSTerminal.DEVICE_NAME_RF_CARD_READER);
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| </syntaxhighlight>
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| * '''Open Device:'''
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| Execute the command to open the card reader device. This step establishes a connection between the Java application and the card reader.
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| <syntaxhighlight lang="java" line='line'>
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| device.open();
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| </syntaxhighlight>
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| * '''Search for Card:'''
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| Initiate a search for the contactless CPU card. This involves scanning for available cards within the reader's range.
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| <syntaxhighlight lang="java" line='line'>
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| OperationListener listener = new OperationListener() {
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| @Override
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| public void handleResult(OperationResult arg0) {
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| if (arg0.getResultCode() == OperationResult.SUCCESS) {
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| sendSuccessLog2(mContext.getString(R.string.find_card_succeed));
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| rfCard = ((RFCardReaderOperationResult) arg0).getCard();
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| } else {
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| sendFailedLog2(mContext.getString(R.string.find_card_failed));
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| }
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| }
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| };
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| device.listenForCardPresent(listener, TimeConstants.FOREVER); The result will be returned in the callback listener.
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| </syntaxhighlight>
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| * '''Communicate with Card:'''
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| Once the card is detected, establish communication. This step may involve reading from or writing to the card, depending on the application's requirements.
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| <syntaxhighlight lang="java" line='line'>
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| if (rfCard instanceof CPUCard) {
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| CPUCard cpucard = ((CPUCard) rfCard);
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| ATR atr = cpucard .connect();
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| result = cpucard .transmit(arryAPDU, 0);
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| cpucard .disconnect();
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| }
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| </syntaxhighlight>
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| * '''Close Device:'''
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| After the communication with the card is complete, close the device to end the session. This step is crucial for maintaining device security and integrity.
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| <syntaxhighlight lang="java" line='line'>
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| device.close();
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| </syntaxhighlight>
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| == Important Notes ==
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| * Each step should be performed in sequence to ensure successful communication with the contactless CPU card.
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| * Handle exceptions and errors appropriately to maintain the stability of your application.
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