Flutter文件读取插件flutter_filereader的使用

发布于 1周前 作者 h691938207 来自 Flutter

Flutter FileReader插件的使用

插件介绍

Flutter FileReader插件是一个用于在Flutter应用中读取本地文件的插件。它支持多种文件类型,包括DOCX、DOC、XLSX、XLS、PPTX、PPT、PDF和TXT等。iOS平台由WKWebView实现,Android平台由腾讯X5实现(不支持Google Play)。

安装插件

首先,你需要将以下代码添加到你的pubspec.yaml文件中:

dependencies:
  flutter_filereader: ^1.0.0

或者根据你使用的版本号进行更新:

dependencies:
  flutter_filereader: ^2.2.0

使用示例

下面是一个完整的示例代码,展示了如何使用Flutter FileReader插件来读取本地文件。

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

class FileReaderPage extends StatefulWidget {
  final String filePath;

  FileReaderPage({Key key, this.filePath});

  [@override](/user/override)
  _FileReaderPageState createState() => _FileReaderPageState();
}

class _FileReaderPageState extends State<FileReaderPage> {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("doc"),
      ),
      body: FileReaderView(
        filePath: widget.filePath,
      ),
    );
  }
}

注意事项

  • 不支持在Android模拟器上运行。
  • TXT文档如果显示乱码,请将TXT文档编码改成gbk。

示例代码

以下是完整的示例代码,展示如何使用Flutter FileReader插件读取本地文件:

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter_filereader_example/file.dart';
import 'package:oktoast/oktoast.dart';
import 'package:path_provider/path_provider.dart';
import 'package:permission_handler/permission_handler.dart';

void main() => runApp(MyApp());

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

class _MyAppState extends State<MyApp> {
  Map<String, String> iosfiles = {
    "docx": "assets/files/docx.docx", // IOS test
    "doc": "assets/files/doc.doc", // IOS test
    "xlsx": "assets/files/xlsx.xlsx", // IOS test
    "xls": "assets/files/xls.xls", // IOS test
    "pptx": "assets/files/pptx.pptx", // IOS test
    "ppt": "assets/files/ppt.ppt", // IOS test
    "pdf": "assets/files/pdf.pdf", // IOS test
    "txt": "assets/files/txt.txt", // IOS test
    "jpg": "assets/files/jpg.jpg", //
    "jpeg": "assets/files/jpeg1.jpeg", //
    "png": "assets/files/png.png", //
  };

  Map<String, String> androidfiles = {
    "docx": "assets/files/docx.docx", // android test
    "doc": "assets/files/doc.doc", // android test
    "xlsx": "assets/files/xlsx.xlsx", // android test
    "xls": "assets/files/xls.xls", // android test
    "pptx": "assets/files/pptx.pptx", // android test
    "ppt": "assets/files/ppt.ppt", // android test
    "pdf": "assets/files/pdf.pdf", // android test
    "txt": "assets/files/txt.txt" // android test
  };

  Map<String, String> files = {};

  [@override](/user/override)
  void initState() {
    if (Platform.isAndroid) {
      files = androidfiles;
    } else if (Platform.isIOS) {
      files = iosfiles;
    }
    super.initState();
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return OKToast(
      child: MaterialApp(
        home: HomePage(),
      ),
    );
  }

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

  class _HomePageState extends State<HomePage> {
    [@override](/user/override)
    void initState() {
      super.initState();
    }

    [@override](/user/override)
    Widget build(BuildContext context) {
      return Scaffold(
        appBar: AppBar(
          title: const Text('File Reader'),
        ),
        body: ListView.builder(
          itemBuilder: (ctx, index) {
            return item(files.keys.elementAt(index), files.values.elementAt(index));
          },
          itemCount: files.length,
        ),
      );
    }

    item(String type, String path) {
      return GestureDetector(
        onTap: () {
          onTap(type, path);
        },
        child: Container(
          alignment: Alignment.center,
          height: 50,
          margin: EdgeInsetsDirectional.only(bottom: 5),
          color: Colors.blue,
          child: Center(
            child: Text(
              type,
              style: TextStyle(color: Colors.white, fontSize: 20),
            ),
          ),
        ),
      );
    }

    onTap(String type, String assetPath) async {
      bool isGranted = await Permission.storage.isGranted;
      if (!isGranted) {
        isGranted = (await Permission.storage.request()).isGranted;
        if (!isGranted) {
          showToast("NO Storage Permission");
          return;
        }
      }
      String localPath = await fileLocalName(type, assetPath);
      if (!await File(localPath).exists()) {
        if (!await asset2Local(type, assetPath)) {
          return;
        }
      }
      Navigator.of(context).push(MaterialPageRoute(builder: (ctx) {
        return FileReaderPage(
          filePath: localPath,
        );
      }));
    }

    fileLocalName(String type, String assetPath) async {
      String dic = await _localSavedDir() + "/filereader/files/";
      return dic + base64.encode(utf8.encode(assetPath)) + "." + type;
    }

    fileExists(String type, String assetPath) async {
      String fileName = await fileLocalName(type, assetPath);
      if (await File(fileName).exists()) {
        return true;
      }
      return false;
    }

    asset2Local(String type, String assetPath) async {
      if (Platform.isAndroid) {
        if (!await Permission.storage.isGranted) {
          debugPrint("没有存储权限");
          return false;
        }
      }

      File file = File(await fileLocalName(type, assetPath));
      if (await fileExists(type, assetPath)) {
        await file.delete();
      }
      await file.create(recursive: true);
      //await file.create();
      debugPrint("文件路径-&gt;" + file.path);
      ByteData bd = await rootBundle.load(assetPath);
      await file.writeAsBytes(bd.buffer.asUint8List(), flush: true);
      return true;
    }

    _localSavedDir() async {
      Directory? dic;
      if (defaultTargetPlatform == TargetPlatform.android) {
        dic = await getExternalStorageDirectory();
      } else if (defaultTargetPlatform == TargetPlatform.iOS) {
        dic = await getApplicationDocumentsDirectory();
      }
      return dic?.path;
    }
  }
}

更多关于Flutter文件读取插件flutter_filereader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文件读取插件flutter_filereader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,以下是如何在Flutter应用中使用flutter_filereader插件来读取文件的示例代码。请注意,flutter_filereader插件并非一个广泛认知的标准Flutter插件,这里假设你提到的插件类似于一些常见的文件读取插件的功能。如果flutter_filereader确实存在但功能有所不同,请根据官方文档进行调整。

在Flutter中,读取文件通常使用path_provider插件来获取应用沙盒内的文件路径,并结合Dart的File类来进行操作。不过,为了贴合你的要求,这里假设flutter_filereader插件提供了一个简单的方法来读取文件内容。

首先,确保你已经在pubspec.yaml文件中添加了flutter_filereader(如果它存在)和path_provider依赖:

dependencies:
  flutter:
    sdk: flutter
  flutter_filereader: ^x.y.z  # 假设的版本号
  path_provider: ^2.0.0  # 用于获取文件路径

然后,运行flutter pub get来安装依赖。

接下来是示例代码,展示如何使用flutter_filereader(假设其API类似于常见的文件读取插件)来读取文件内容:

import 'package:flutter/material.dart';
import 'package:flutter_filereader/flutter_filereader.dart';  // 假设的导入路径
import 'package:path_provider/path_provider.dart';
import 'dart:io';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: FileReaderDemo(),
    );
  }
}

class FileReaderDemo extends StatefulWidget {
  @override
  _FileReaderDemoState createState() => _FileReaderDemoState();
}

class _FileReaderDemoState extends State<FileReaderDemo> {
  String _fileContent = '';

  Future<void> _readFile() async {
    // 获取应用文档目录
    final Directory appDocDir = await getApplicationDocumentsDirectory();
    String filePath = '${appDocDir.path}/example.txt';

    // 写入一些示例数据到文件(仅用于演示,实际应用中文件可能已经存在)
    File file = File(filePath);
    await file.writeAsString('Hello, Flutter file reader!');

    // 使用flutter_filereader插件读取文件内容(假设的API)
    // 注意:这里的API调用是假设的,请根据实际插件的文档进行调整
    String content = await FlutterFileReader.readFile(filePath);

    // 更新UI
    setState(() {
      _fileContent = content;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter File Reader Demo'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'File Content:',
              style: TextStyle(fontSize: 20),
            ),
            SizedBox(height: 20),
            Text(
              _fileContent,
              style: TextStyle(fontSize: 18),
              maxLines: 5,
              overflow: TextOverflow.ellipsis,
            ),
            SizedBox(height: 20),
            ElevatedButton(
              onPressed: _readFile,
              child: Text('Read File'),
            ),
          ],
        ),
      ),
    );
  }
}

注意

  1. 上面的代码示例假设FlutterFileReader有一个静态方法readFile,它接受文件路径作为参数并返回文件内容。实际上,你需要查阅flutter_filereader插件的官方文档来了解其真实API。
  2. 如果flutter_filereader插件不存在或API不同,你可能需要使用dart:io中的File类来读取文件,如下所示:
String content = await file.readAsString();

替换掉FlutterFileReader.readFile(filePath)调用。

  1. 确保在实际应用中处理文件读写时添加必要的错误处理逻辑。
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