Flutter插件air_brother的介绍与使用方法详解

Flutter插件air_brother的介绍与使用方法详解

Flutter插件air_brother简介

air_brother 是一个用于通过 Brother 扫描仪进行扫描的 Flutter SDK。它支持 Android 和 iOS 平台。

Android 支持

• 支持
  在 Android 上，该插件能够发现并连接到 Brother 扫描设备。

iOS 支持

• 支持
  在 iOS 上，为了确保插件正常工作，需要在 Info.plist 文件中添加以下配置：

<key>NSBonjourServices</key>
<array>
    <string>_ipp._tcp</string>
    <string>_scanner._tcp</string>
    <string>_pdl-datastream._tcp</string>
</array>
<key>NSLocalNetworkUsageDescription</key>
<string>我想要查找扫描仪。</string>

示例代码

以下是一个完整的示例代码，展示如何使用 air_brother 插件来扫描和打印文件。

import 'dart:io';

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

import 'package:flutter/services.dart';
import 'package:air_brother/air_brother.dart';

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

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

class _MyAppState extends State<MyApp> {
  String _platformVersion = '未知';

  List<String> _scannedFiles = [];

  Future<List<Connector>> _fetchDevices = AirBrother.getNetworkDevices(5000);

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

  // 初始化平台状态
  Future<void> initPlatformState() async {
    String platformVersion;
    try {
      platformVersion = await AirBrother.platformVersion;
    } on PlatformException {
      platformVersion = '获取平台版本失败。';
    }

    if (!mounted) return;

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

  // 扫描文件
  void _scanFiles(Connector connector) async {
    List<String> outScannedPaths = [];
    ScanParameters scanParams = ScanParameters();
    scanParams.documentSize = MediaSize.A6;
    JobState jobState = await connector.performScan(scanParams, outScannedPaths);
    print("JobState: $jobState");
    print("Files Scanned: $outScannedPaths");

    setState(() {
      _scannedFiles = outScannedPaths;
    });
  }

  // 打印文件
  void _printFiles(Connector connector) async {
    List<String> outScannedPaths = [];
    PrintParameters printParams = PrintParameters();
    printParams.paperSize = MediaSize.A4;
    JobState jobState = await connector.performPrint(printParams, outScannedPaths);
    print("JobState: $jobState");
    print("Files Scanned: $outScannedPaths");

    setState(() {
      _scannedFiles = outScannedPaths;
    });
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    Widget body;

    if (_scannedFiles.isNotEmpty) {
      body = ListView.builder(
          itemCount: _scannedFiles.length,
          itemBuilder: (context, index) {
            return GestureDetector(
                onTap: () {
                  setState(() {
                    _scannedFiles = [];
                  });
                },
                child: Image.file(File(_scannedFiles[index])));
          });
    } else {
      body = Padding(
        padding: const EdgeInsets.all(8.0),
        child: FutureBuilder(
          future: _fetchDevices,
          builder: (context, AsyncSnapshot<List<Connector>> snapshot) {
            print("Snapshot ${snapshot.data}");
            if (snapshot.connectionState == ConnectionState.waiting) {
              return Text("正在搜索网络中的扫描仪。");
            }
            if (snapshot.hasData) {
              List<Connector> connectors = snapshot.data!;

              if (connectors.isEmpty) {
                return Text("未找到扫描仪");
              }
              return ListView.builder(
                  itemCount: connectors.length,
                  itemBuilder: (context, index) {
                    return ListTile(
                      title: Text(connectors[index].getModelName()),
                      subtitle: Text(connectors[index].getDescriptorIdentifier()),
                      onTap: () {
                        _scanFiles(connectors[index]);
                        // _printFiles(connectors[index]);
                      },
                    );
                  });
            } else {
              return Text("正在搜索设备");
            }
          },
        ),
      );
    }

    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('插件示例应用'),
        ),
        body: body,
        floatingActionButton: FloatingActionButton(
          onPressed: () {
            setState(() {
              _fetchDevices = AirBrother.getNetworkDevices(5000);
            });
          },
          child: Icon(Icons.navigation),
          backgroundColor: Colors.green,
        ),
      ),
    );
  }
}