Flutter功能未定义插件another_brother的使用

发布于 1周前 作者 yuanlaile 来自 Flutter

Flutter功能未定义插件another_brother的使用

another_brother 简介

another_brother 是一个用于 Flutter 的 Brother SDK 库,支持通过蓝牙、Wi-Fi 和 USB 与 Brother 打印机进行通信。它提供了对 Android 和 iOS 平台的支持,并且可以用于开发需要与 Brother 打印机交互的应用程序。

支持平台

  • Android 支持
    • Bluetooth/BLE
    • Wi-Fi
    • USB
  • iOS 支持
    • Bluetooth/BLE
    • Wi-Fi

Android 最低 SDK 版本

  • 需要 minSdkVersion 19

iOS Info.plist 配置

为了使 another_brother 在 iOS 上正常工作,你需要在 Info.plist 文件中添加以下配置:

<!-- Another Brother Section -->
<key>NSLocalNetworkUsageDescription</key>
<string>查找本地 TCP Bonjour 服务</string>
<key>NSBonjourServices</key>
<array>
    <string>_ipp._tcp</string>
    <string>_printer._tcp</string>
    <string>_pdl-datastream._tcp</string>
</array>
<key>UIBackgroundModes</key>
<array>
    <string>fetch</string>
    <string>remote-notifications</string>
</array>
<key>NSBluetoothAlwaysUsageDescription</key>
<string>需要 BLE 权限</string>
<key>NSBluetoothPeripheralUsageDescription</key>
<string>需要 BLE 权限</string>
<key>NSLocationAlwaysAndWhenInUseUsageDescription</key>
<string>需要位置权限</string>
<key>NSLocationAlwaysUsageDescription</key>
<string>需要位置权限</string>
<key>NSLocationWhenInUseUsageDescription</key>
<string>需要位置权限</string>
<key>UISupportedExternalAccessoryProtocols</key>
<array>
    <string>com.brother.ptcbp</string>
    <!-- 仅在与 TypeB 打印机配合使用时需要。重要:如果计划发布到 Apple App Store,请勿使用此配置,否则会导致应用被拒 -->
    <string>com.issc.datapath</string>
</array>
<!-- End Another Brother Section -->

iOS 设置注意事项

  • 在 Xcode 中,确保将 Allow non-modular includes 设置为 yes
  • libBROTHERSDK.a 标记为属于 another_brother

提交到 Apple App Store

当你提交应用程序到 Apple App Store 时,需要从 Brother 获取 PPID(Product Part ID)。你可以通过访问 Brother 的官方网站申请 PPID。如果没有 PPID,你的应用程序可能会收到类似以下的拒绝消息:

应用程序未获得配件制造商的授权,无法与 MFi 配件一起使用

使用示例代码

以下是一个完整的示例应用程序,展示了如何使用 another_brother 插件与 Brother 打印机进行交互。

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

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

class MyApp extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Brother Printer Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: PrinterPage(),
    );
  }
}

class PrinterPage extends StatefulWidget {
  [@override](/user/override)
  _PrinterPageState createState() => _PrinterPageState();
}

class _PrinterPageState extends State<PrinterPage> {
  List<BTPrinter> _printers = [];
  String _status = "未连接";

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

  Future<void> _searchPrinters() async {
    try {
      // 搜索附近的 Brother 打印机
      final printers = await BTPrinter.searchPrinters();
      setState(() {
        _printers = printers;
      });
    } catch (e) {
      print("搜索打印机时出错: $e");
    }
  }

  Future<void> _connectToPrinter(BTPrinter printer) async {
    try {
      // 连接到选定的打印机
      await printer.connect();
      setState(() {
        _status = "已连接";
      });

      // 打印测试内容
      await _printTest(printer);

      // 断开连接
      await printer.disconnect();
      setState(() {
        _status = "已断开连接";
      });
    } catch (e) {
      print("连接或打印时出错: $e");
      setState(() {
        _status = "连接失败";
      });
    }
  }

  Future<void> _printTest(BTPrinter printer) async {
    try {
      // 创建打印任务
      final job = PrintJob();
      job.addText("Hello, Brother Printer!");
      job.addFeed(2);
      job.addCut(CutType.full);

      // 发送打印任务
      await printer.print(job);
    } catch (e) {
      print("打印时出错: $e");
    }
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Brother Printer Demo'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(
              '状态: $_status',
              style: TextStyle(fontSize: 18),
            ),
            SizedBox(height: 20),
            Text(
              '附近打印机:',
              style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold),
            ),
            SizedBox(height: 10),
            Expanded(
              child: ListView.builder(
                itemCount: _printers.length,
                itemBuilder: (context, index) {
                  final printer = _printers[index];
                  return ListTile(
                    title: Text(printer.model ?? "未知型号"),
                    subtitle: Text(printer.macAddress ?? "未知 MAC 地址"),
                    trailing: ElevatedButton(
                      onPressed: () => _connectToPrinter(printer),
                      child: Text('连接并打印'),
                    ),
                  );
                },
              ),
            ),
          ],
        ),
      ),
    );
  }
}

更多关于Flutter功能未定义插件another_brother的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html

1 回复

更多关于Flutter功能未定义插件another_brother的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html


当然,针对你提到的Flutter中功能未定义的插件another_brother,我们可以通过以下步骤来展示如何在一个Flutter项目中集成和使用一个自定义插件(假设another_brother是一个已经发布或者本地开发的插件)。由于another_brother可能不是一个真实存在的插件,以下示例将展示一个假设的插件集成过程。

步骤 1: 添加插件依赖

首先,确保another_brother插件已经发布到pub.dev或者你已经将其作为本地插件添加到项目中。

如果插件已发布到pub.dev:

在你的pubspec.yaml文件中添加依赖:

dependencies:
  flutter:
    sdk: flutter
  another_brother: ^x.y.z  # 替换为实际的版本号

然后运行flutter pub get来安装依赖。

如果插件是本地的:

在你的pubspec.yaml文件中添加路径依赖:

dependencies:
  flutter:
    sdk: flutter
  another_brother:
    path: ../path/to/another_brother  # 替换为实际的本地路径

同样运行flutter pub get来安装依赖。

步骤 2: 使用插件

假设another_brother插件提供了一个简单的功能,比如显示一个消息。我们需要在Dart代码中导入并使用这个插件。

示例代码:

import 'package:flutter/material.dart';
import 'package:another_brother/another_brother.dart';  // 导入插件

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Another Brother Plugin Example'),
        ),
        body: Center(
          child: ElevatedButton(
            onPressed: () async {
              // 使用插件提供的功能
              try {
                String message = await AnotherBrother.showMessage();
                ScaffoldMessenger.of(context).showSnackBar(
                  SnackBar(content: Text(message)),
                );
              } catch (e) {
                print('Error using AnotherBrother plugin: $e');
              }
            },
            child: Text('Show Message from Another Brother'),
          ),
        ),
      ),
    );
  }
}

步骤 3: 插件实现(假设是本地插件)

如果你正在开发another_brother插件,你可能需要在插件的Dart和原生代码部分实现showMessage功能。以下是一个简单的本地插件实现示例。

Dart部分(lib/another_brother.dart):

import 'dart:async';

class AnotherBrother {
  static const MethodChannel _channel = MethodChannel('another_brother');

  static Future<String> showMessage() async {
    final String message = await _channel.invokeMethod('showMessage');
    return message;
  }
}

Android部分(android/src/main/kotlin/.../AnotherBrotherPlugin.kt):

package com.example.anotherbrother

import io.flutter.embedding.engine.plugins.FlutterPlugin
import io.flutter.embedding.engine.plugins.activity.ActivityAware
import io.flutter.embedding.engine.plugins.activity.ActivityPluginBinding
import io.flutter.plugin.common.MethodCall
import io.flutter.plugin.common.MethodChannel
import io.flutter.plugin.common.MethodChannel.MethodCallHandler
import io.flutter.plugin.common.MethodChannel.Result
import androidx.annotation.NonNull

class AnotherBrotherPlugin: FlutterPlugin, MethodCallHandler, ActivityAware {
  private var channel: MethodChannel? = null

  override fun onAttachedToEngine(@NonNull flutterPluginBinding: FlutterPluginBinding) {
    channel = MethodChannel(flutterPluginBinding.binaryMessenger, "another_brother")
    channel?.setMethodCallHandler(this)
  }

  override fun onMethodCall(@NonNull call: MethodCall, @NonNull result: Result) {
    if (call.method == "showMessage") {
      result.success("Hello from Another Brother Plugin!")
    } else {
      result.notImplemented()
    }
  }

  override fun onDetachedFromEngine(@NonNull binding: FlutterPluginBinding) {
    channel?.setMethodCallHandler(null)
    channel = null
  }

  override fun onAttachedToActivity(binding: ActivityPluginBinding) {
    // No-op
  }

  override fun onDetachedFromActivityForConfigChanges() {
    // No-op
  }

  override fun onReattachedToActivityForConfigChanges(binding: ActivityPluginBinding) {
    // No-op
  }

  override fun onDetachedFromActivity() {
    // No-op
  }
}

iOS部分(ios/Classes/SwiftAnotherBrotherPlugin.swift):

import Flutter

public class SwiftAnotherBrotherPlugin: NSObject, FlutterPlugin {
  public static func register(with registrar: FlutterRegistrar) {
    let channel = FlutterMethodChannel(name: "another_brother", binaryMessenger: registrar.messenger())
    let instance = SwiftAnotherBrotherPlugin()
    registrar.addMethodCallDelegate(instance, channel: channel)
  }

  public func handle(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
    if call.method == "showMessage" {
      result("Hello from Another Brother Plugin!")
    } else {
      result(FlutterMethodNotImplemented)
    }
  }
}

请注意,以上代码是一个简化的示例,实际插件开发可能需要更多的配置和错误处理。如果你遇到功能未定义的问题,确保你已经正确实现了插件的所有必要部分,并且插件的接口与你的Dart代码中的调用相匹配。

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