Flutter文件读取插件flutter_filereader的使用
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->" + 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
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:
- 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。 - 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。
- 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。