dtb_link 0.1.18+35

DTB Link - utility app enabling applications to connect and integrate with NFC card readers over Bluetooth

example/lib/main.dart

import 'dart:async';
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:dtb_link/dtb_link.dart';

enum EasyKey { sKey, echo, saleTran, voidTran }

typedef OnDevice = Function;

void main() {
  runApp(const MaterialApp(home: MyApp()));
}

class MyApp extends StatefulWidget {
  const MyApp({super.key});

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String _platformVersion = 'Unknown';
  DtbLink dtbLink = DtbLink();
  DataInitRet? initData;
  List<BluetoothDevice> deviceList = [];
  TextEditingController controller = TextEditingController();
  ScrollController scrollController = ScrollController();
  OnDevice? onDevice;
  Map<String, dynamic>? lastTran;

  @override
  void initState() {
    super.initState();
    dtbLink.dtbLibInit(const bool.fromEnvironment("dart.vm.product") ? InitType.production : InitType.staging);
    WidgetsBinding.instance.addPostFrameCallback((_) {
      dtbLink.terminalInitData().then((data) {
        debugPrint("initData: ${data?.toJson()}");
        initData = data;
      });
      dtbLink.onEvent((onData) {
        debugPrint("onData: $onData");
        Map<String, dynamic> retData = json.decode(onData);
        if (retData["command"] == "bluetooth.device_found") {
          String? deviceId = retData["ret"]?["device_id"];
          String? deviceName = retData["ret"]?["device_name"];
          if (deviceId != null && deviceName != null) {
            final device = BluetoothDevice(deviceId: deviceId, deviceName: deviceName);
            if (!deviceList.contains(device)) {
              setState(() {
                deviceList.add(device);
                addMessage("${device.toJson()}");
              });
              onDevice?.call();
            }
          }
        } else if (retData["command"] == "bluetooth.download_file.pregress") {
          int? current = retData["ret"]?["current"];
          int? total = retData["ret"]?["total"];
          debugPrint("current: $current, total: $total");
        }
      });
      initPlatformState();
    });
  }

  Future<void> initPlatformState() async {
    String platformVersion;
    try {
      debugPrint("platformVersion before");
      platformVersion = await dtbLink.getPlatformVersion() ?? 'Unknown platform version';
      debugPrint("platformVersion: $platformVersion");
    } on PlatformException {
      platformVersion = 'Failed to get platform version.';
    }
    if (!mounted) return;

    setState(() {
      _platformVersion = platformVersion;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text("DTB Link Flutter Demo $_platformVersion")),
      body: Padding(
        padding: const EdgeInsets.all(10),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.start,
          children: [
            Expanded(
              child: Row(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Expanded(
                    child: Card(
                      child: Padding(
                        padding: const EdgeInsets.all(8.0),
                        child: Wrap(
                          children: [
                            const Text("Bluetooth"),
                            DtbButton(
                              onPressed: () {
                                deviceList.clear();
                                addMessage("=>Search device");
                                showSearchDialog(context);
                                dtbLink.bluetoothStartSearch();
                              },
                              title: "Search device",
                            ),
                            DtbButton(
                              onPressed: () {
                                addMessage("=>Is connected");
                                dtbLink.bluetoothIsConnected().then((result) {
                                  addMessage("<=$result");
                                });
                              },
                              title: "Is connected",
                            ),
                            DtbButton(
                              onPressed: () {
                                addMessage("=>Contactless upload");
                                dtbLink.bluetoothContactlessFileUpload().then((result) {
                                  addMessage("<=$result");
                                });
                              },
                              title: "Contactless upload",
                            ),
                            DtbButton(
                              onPressed: () {
                                addMessage("=>EMV upload");
                                dtbLink.bluetoothEmvFileUpload().then((result) {
                                  addMessage("<=$result");
                                });
                              },
                              title: "EMV upload",
                            ),
                            DtbButton(
                              onPressed: () {
                                addMessage("=>Device data");
                                dtbLink.bluetoothDeviceData().then((device) {
                                  addMessage("<=${device.toJson()}");
                                });
                              },
                              title: "Device Data",
                            ),
                            DtbButton(
                              onPressed: () {
                                addMessage("=>Reconnect Device");
                                dtbLink.bluetoothReconnectDevice().then((ret) {
                                  addMessage("<=$ret}");
                                });
                              },
                              title: "Reconnect Device",
                            ),
                            DtbButton(
                              onPressed: () {
                                addMessage("=>Card read");
                                dtbLink.traceNo.then((traceNo) {
                                  dtbLink.bluetoothCardRead(amount: "100", tranType: 1, traceNo: traceNo).then((ret) {
                                    addMessage("<=$ret");
                                  });
                                });
                              },
                              title: "Card read",
                            ),
                          ],
                        ),
                      ),
                    ),
                  ),
                  Expanded(
                    child: Card(
                      child: Padding(
                        padding: const EdgeInsets.all(8.0),
                        child: Wrap(
                          children: [
                            const Text("Terminal"),
                            DtbButton(
                              onPressed: () {
                                addMessage("=>Echo test");
                                dtbLink.terminalEchoTest().then((ret) {
                                  addMessage("<=$ret");
                                });
                              },
                              title: "Echo Test",
                            ),
                            DtbButton(
                              onPressed: () {
                                addMessage("=>Init Data");
                                dtbLink.terminalInitData().then((ret) {
                                  addMessage("<=${ret?.toJson()}");
                                });
                              },
                              title: "Init Data",
                            ),
                            DtbButton(
                              onPressed: () {
                                addMessage("=>Init terminal");
                                dtbLink.terminalDoInit(terminalId: "Prepared Terminal ID", trc: "TRC code").then((ret) {
                                //   dtbLink.terminalDoInit(terminalId: "KP000142", trc: "021655").then((ret) {
                                  // dtbLink.terminalDoInit(terminalId: "QR110402", trc: "040610").then((ret) {
                                  addMessage("<=${ret.toJson()}");
                                });
                              },
                              title: "Init Terminal",
                            ),
                            DtbButton(
                              onPressed: () {
                                addMessage("=>Sync Key");
                                dtbLink.syncKey().then((ret) {
                                  addMessage("<=${ret.toJson()}");
                                });
                              },
                              title: "Sync Key",
                            ),
                            DtbButton(
                              onPressed: () {
                                addMessage("=>Do Sale");
                                dtbLink.doSale(amount: 100).then((ret) {
                                  addMessage("<=$ret");
                                  debugPrint("ret: $ret");
                                  Map<String, dynamic> tranRet = ret["ret"];
                                  if (tranRet["resp_code"] == "000") {
                                    debugPrint("tranRet: $tranRet");
                                    setState(() {
                                      lastTran = tranRet;
                                    });
                                  }
                                });
                              },
                              title: "Do Sale",
                            ),
                            DtbButton(
                              onPressed: lastTran != null ? doVoid : null,
                              title: "Do Void",
                            ),
                          ],
                        ),
                      ),
                    ),
                  ),
                ],
              ),
            ),
            Expanded(
              child: SingleChildScrollView(
                controller: scrollController,
                child: TextField(
                  maxLines: null,
                  enabled: false,
                  controller: controller,
                  style: const TextStyle(fontSize: 11),
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }

  doVoid() {
    addMessage("=>Do Void");
    debugPrint("lastTran: $lastTran");
    String? amountStr = lastTran?["amount"];
    String? encTrack2 = lastTran?["enc_track"];
    String? rrn = lastTran?["rrn"];
    String? authCode = lastTran?["auth_code"];
    String? traceNo = lastTran?["trace_no"];
    if (amountStr != null && encTrack2 != null && rrn != null && authCode != null && traceNo != null) {
      dtbLink.doVoid(amountStr: amountStr, encTrack2: encTrack2, rrn: rrn, authCode: authCode, traceNo: traceNo).then(
        (ret) {
          addMessage("<=$ret");
        },
      );
    }
  }

  addMessage(String msg) {
    controller.text = "${controller.text}\n$msg";
    Future.delayed(const Duration(milliseconds: 200), () {
      scrollController.animateTo(scrollController.position.maxScrollExtent,
          duration: const Duration(milliseconds: 200), curve: Curves.easeInOut);
    });
  }

  showSearchDialog(BuildContext context) {
    showDialog(
      context: context,
      builder: (context) {
        return StatefulBuilder(
          builder: (BuildContext context, void Function(void Function()) setState) {
            onDevice = () {
              setState(() {});
            };

            Widget buildDevice(BluetoothDevice device) {
              return DtbButton(
                title: '${device.deviceName}\n${device.deviceId}',
                onPressed: () {
                  Navigator.of(context).pop();
                  onDevice = null;
                  dtbLink.connectDevice(device);
                },
              );
            }

            List<Widget> buildList() {
              List<Widget> list = [];
              for (BluetoothDevice device in deviceList) {
                list.add(buildDevice(device));
              }
              return list;
            }

            return AlertDialog(
              title: const Text('Dialog Title'),
              content: Column(
                mainAxisSize: MainAxisSize.min,
                children: buildList(),
              ),
            );
          },
        );
      },
    );
  }
}

class DtbButton extends ElevatedButton {
  DtbButton({
    super.key,
    super.onPressed,
    required String title,
  }) : super(
          child: Text(title, style: const TextStyle(fontSize: 11)),
          style: ElevatedButton.styleFrom(
            elevation: 0.5,
            minimumSize: const Size.fromHeight(38),
            shape: RoundedRectangleBorder(
              borderRadius: BorderRadius.circular(4), // <-- Radius
            ),
          ),
        );
}