dtb_link 0.0.15+21

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 }

void main() {
  runApp(const 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();

  @override
  void initState() {
    super.initState();
    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()}");
              });
            }
          }
        } 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 MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text("DTB Link Flutter Demo $_platformVersion")),
        body: Padding(
          padding: const EdgeInsets.all(10),
          child: Column(
            children: [
              Expanded(
                child: SingleChildScrollView(
                  child: Column(
                    children: [
                      Card(
                        child: Padding(
                          padding: const EdgeInsets.all(8.0),
                          child: Wrap(
                            runSpacing: 6,
                            children: [
                              const Text("Bluetooth"),
                              ElevatedButton(
                                onPressed: () {
                                  deviceList.clear();
                                  addMessage("=>search device");
                                  dtbLink.bluetoothStartSearch();
                                },
                                style: ElevatedButton.styleFrom(minimumSize: const Size.fromHeight(50)),
                                child: const Text("Bluetooth Search"),
                              ),
                              ElevatedButton(
                                onPressed: () {
                                  addMessage("=>isConnected");
                                  dtbLink.bluetoothIsConnected().then((result) {
                                    addMessage("<=$result");
                                  });
                                },
                                style: ElevatedButton.styleFrom(minimumSize: const Size.fromHeight(50)),
                                child: const Text("Bluetooth is connected"),
                              ),
                              ElevatedButton(
                                onPressed: () {
                                  addMessage("=>Contactless upload");
                                  dtbLink.bluetoothContactlessFileUpload().then((result) {
                                    addMessage("<=$result");
                                  });
                                },
                                style: ElevatedButton.styleFrom(minimumSize: const Size.fromHeight(50)),
                                child: const Text("Bluetooth Contactless upload"),
                              ),
                              ElevatedButton(
                                onPressed: () {
                                  addMessage("=>Contactless upload");
                                  dtbLink.bluetoothEmvFileUpload().then((result) {
                                    addMessage("<=$result");
                                  });
                                },
                                style: ElevatedButton.styleFrom(minimumSize: const Size.fromHeight(50)),
                                child: const Text("Bluetooth EMV upload"),
                              ),
                              ElevatedButton(
                                onPressed: () {
                                  addMessage("=>Device data");
                                  dtbLink.bluetoothDeviceData().then((device) {
                                    addMessage("<=${device.toJson()}");
                                  });
                                },
                                style: ElevatedButton.styleFrom(minimumSize: const Size.fromHeight(50)),
                                child: const Text("Bluetooth Device Data"),
                              ),
                              ElevatedButton(
                                onPressed: () {
                                  addMessage("=>Reconnect Device");
                                  dtbLink.bluetoothReconnectDevice().then((device) {
                                    addMessage("<=${device?.toJson()}");
                                  });
                                },
                                style: ElevatedButton.styleFrom(minimumSize: const Size.fromHeight(50)),
                                child: const Text("Bluetooth Reconnect Device"),
                              ),
                              ElevatedButton(
                                onPressed: () {
                                  addMessage("=>card read");
                                  dtbLink.traceNo.then((traceNo) {
                                    dtbLink
                                        .bluetoothCardRead(amount: "500.00", tranType: 1, traceNo: traceNo)
                                        .then((ret) {
                                      addMessage("<=$ret");
                                    });
                                  });
                                },
                                style: ElevatedButton.styleFrom(minimumSize: const Size.fromHeight(50)),
                                child: const Text("Bluetooth card read"),
                              ),
                            ],
                          ),
                        ),
                      ),
                      Card(
                        child: Padding(
                          padding: const EdgeInsets.all(8.0),
                          child: Wrap(
                            runSpacing: 6,
                            children: [
                              const Text("Terminal"),
                              ElevatedButton(
                                onPressed: () {
                                  addMessage("=>Echo test");
                                  dtbLink.terminalEchoTest().then((ret) {
                                    addMessage("<=$ret");
                                  });
                                },
                                style: ElevatedButton.styleFrom(minimumSize: const Size.fromHeight(50)),
                                child: const Text("Echo Test"),
                              ),
                              ElevatedButton(
                                onPressed: () {
                                  addMessage("=>Init Data");
                                  dtbLink.terminalInitData().then((ret) {
                                    addMessage("<=${ret?.toJson()}");
                                  });
                                },
                                style: ElevatedButton.styleFrom(minimumSize: const Size.fromHeight(50)),
                                child: const Text("Init Data"),
                              ),
                              ElevatedButton(
                                onPressed: () {
                                  addMessage("=>Init terminal");
                                  dtbLink.terminalDoInit(terminalId: "", trc: "").then((ret) {
                                    addMessage("<=${ret.toJson()}");
                                  });
                                },
                                style: ElevatedButton.styleFrom(minimumSize: const Size.fromHeight(50)),
                                child: const Text("Init Terminal"),
                              ),
                              ElevatedButton(
                                onPressed: () {
                                  addMessage("=>do sale");
                                  dtbLink.doSale(amount: 500).then((ret) {
                                    addMessage("<=$ret");
                                  });
                                },
                                style: ElevatedButton.styleFrom(minimumSize: const Size.fromHeight(50)),
                                child: const Text("Do Sale"),
                              ),
                            ],
                          ),
                        ),
                      )
                    ],
                  ),
                ),
              ),
              // Text
              Container(
                constraints: const BoxConstraints(maxHeight: 200),
                child: SingleChildScrollView(
                  controller: scrollController,
                  child: TextField(
                    maxLines: null,
                    enabled: false,
                    controller: controller,
                  ),
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }

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