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| == API Overview ==
| | {{Migrating|https://smartpossdk.gitbook.io/cloudpossdk/faq/other-development/customize-pinpad-gui}} |
| === <big>setupCallbackHandler</big>===
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| <syntaxhighlight lang="java">boolean setupCallbackHandler(PinPadCallbackHandler handler)</syntaxhighlight>
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| This API allows you to set a custom callback handler for PINPAD inputs in your POS application. When a PIN is inputted on the PINPAD, the specified callback handler is triggered.
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| {|class="wizarpostable" | |
| |-
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| ! scope="row" colspan="2" | Parameters
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| |-
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| | handler|| '''PinPadCallbackHandler :''' Not null.
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| |-
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| ! scope="row" colspan="2" | Returns
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| |-
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| | boolean|| true: success.
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| |}
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| | |
| === <big>processCallback of PinPadCallbackHandler </big>===
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| <syntaxhighlight lang="java">void processCallback(byte[] data);</syntaxhighlight>
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| The API provides a method to set this callback handler.
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| {|class="wizarpostable"
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| |-
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| ! scope="row" colspan="2" | Parameters
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| |-
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| | data|| '''byte[] :''' date[0] is the count of input pin.
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| |}
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| {|
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| |-
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| |}
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| == Implementation Steps ==
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| # '''Initialize the PINPAD:'''
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| #* Before setting up the callback handler, ensure to call the ''''open'''' method to initialize the PINPAD.
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| # '''Setting the Callback Handler:'''
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| #* Use the ''''setupcallbackhandler'''' method to assign your custom callback handler.
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| #* Once this handler is set, the default PINPAD user interface (UI) will not appear.
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| # '''Handling PIN Input:'''
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| #* The driver will send the count of the inputted PIN to the callback handler.
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| #* Your application (referred to as the third-app) can then process this inputted PIN count as needed.
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| '''Snippet code:'''
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| <syntaxhighlight lang="java">
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| PINPadDevice device = (PINPadDevice) POSTerminal.getInstance(mContext)
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| .getDevice("cloudpos.device.pinpad");
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| device.open();
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| device.setupCallbackHandler(new PinPadCallbackHandler() {
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| @Override
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| public void processCallback(byte[] data) {
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| Log.e(TAG, "processCallback ");
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| mHandler.obtainMessage(PIN_KEY_CALLBACK, data[0]).sendToTarget();
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| }
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| @Override
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| public void processCallback(int nCount, int nExtra){
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| // don't need implement.
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| }
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| });
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| KeyInfo keyInfo = new KeyInfo(PINPadDevice.KEY_TYPE_MK_SK, 0, 0, 4);
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| String pan = "0123456789012345678";
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| OperationResult operationResult = device.waitForPinBlock(keyInfo, pan, false,
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| TimeConstants.FOREVER);
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| if (operationResult.getResultCode() == OperationResult.SUCCESS) {
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| byte[] pinBlock = ((PINPadOperationResult) operationResult).getEncryptedPINBlock();
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| sendSuccessLog2("PINBlock = " + StringUtility.byteArray2String(pinBlock));
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| } else {
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| sendFailedLog2(mContext.getString(R.string.operation_failed));
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| }
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| device.close();
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| </syntaxhighlight>
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