Flutter蓝图绘制插件tsc_blue_print的使用

Flutter蓝图绘制插件tsc_blue_print的使用

描述

这是一个用于Flutter的插件包，适用于Android和iOS平台，可以与TSC标签打印机进行交互。

安装

在pubspec.yaml文件中添加以下依赖：

dependencies:
  tsc_blue_print: ^版本号

然后运行以下命令来安装插件：

flutter pub add tsc_blue_print

示例

以下是完整的示例代码，展示了如何使用tsc_blue_print插件进行蓝牙连接和打印操作。

import 'package:flutter/material.dart';
import 'dart:async';

import 'package:flutter/services.dart';
import 'package:tsc_blue_print/tsc_blue_print.dart';
import 'package:bluetooth_thermal_printer/bluetooth_thermal_printer.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatefulWidget {
  const MyApp({Key? key}) : super(key: key);

  [@override](/user/override)
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String _platformVersion = 'Unknown';
  final _tscBluePrintPlugin = TscBluePrint();

  String device = "";
  bool connected = false;
  List availableBluetoothDevices = [];

  [@override](/user/override)
  void initState() {
    super.initState();
    initPlatformState();
  }

  // 平台消息是异步的，所以我们初始化在一个异步方法中。
  Future<void> initPlatformState() async {
    String platformVersion;
    // 平台消息可能会失败，所以我们使用一个try/catch来处理PlatformException。
    // 我们还处理了消息可能返回null的情况。
    try {
      platformVersion = await _tscBluePrintPlugin.getPlatformVersion() ?? 'Unknown platform version';
    } on PlatformException {
      platformVersion = 'Failed to get platform version.';
    }

    // 如果小部件在异步平台消息还在飞行时从树中移除，我们希望丢弃回复而不是调用setState来更新我们的不存在的外观。
    if (!mounted) return;

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

  Future<void> getBluetooth() async {
    final List? bluetooths = await BluetoothThermalPrinter.getBluetooths;
    print("Print $bluetooths");
    setState(() {
      availableBluetoothDevices = bluetooths == null ? [] : bluetooths;
    });
  }

  Future<void> setConnect(String mac) async {
    //final String? result = await BluetoothThermalPrinter.connect(mac);
    device = mac;
    print("state connected $device");
    setState(() {
      connected = true;
    });
  }

  Future<void> inbound() async {
    String printMessage;
    String idAddress = device;
    print(idAddress);
    try {
      printMessage = await _tscBluePrintPlugin.printBlue(
          ipAddress: device,
          widthPaper: 47,
          heightPaper: 25,
          numero: '0001',
          tara: "0.58",
          bruto: "11.81",
          peso: "11.23",
          vendor: "PEC. SAN FRANCISCO(MAIZALES)",
          expiryDate: '03/22/2020',
          productCode: '000000001',
          productName: 'HUEVO PARDO');
    } on PlatformException {
      printMessage = 'Failed to communicate with this printer.';
    }

    print(printMessage);
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('插件示例应用'),
        ),
        body: Scaffold(
          appBar: AppBar(
            title: Text("TSC 打印测试",
                style: TextStyle(color: Colors.brown)),
            centerTitle: true,
            backgroundColor: Colors.white,
            iconTheme: IconThemeData(color: Colors.brown),
            actions: [],
          ),
          body: Container(
            padding: EdgeInsets.all(20),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text("搜索已配对的蓝牙设备"),
                TextButton(
                  onPressed: () {
                    this.getBluetooth();
                  },
                  child: Text("搜索"),
                ),
                Container(
                  height: 200,
                  child: ListView.builder(
                    itemCount: availableBluetoothDevices.length > 0
                        ? availableBluetoothDevices.length
                        : 0,
                    itemBuilder: (context, index) {
                      return ListTile(
                        onTap: () {
                          String select = availableBluetoothDevices[index];
                          List list = select.split("#");
                          // String name = list[0];
                          String mac = list[1];
                          this.setConnect(mac);
                        },
                        title: Text('${availableBluetoothDevices[index]}'),
                        subtitle: Text("点击以连接"),
                      );
                    },
                  ),
                ),
                SizedBox(
                  height: 30,
                ),
                TextButton(
                  onPressed: connected ? this.inbound : null,
                  child: Text("打印"),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}