Flutter文件扩展名处理插件flutter_file_extention的使用

Flutter文件扩展名处理插件flutter_file_extention的使用

概述

flutter_file_extention 是一个用于在 Android 上管理文件的辅助工具包。它可以帮助开发者轻松地搜索、过滤、排序和管理文件。

开始使用

1. 添加依赖

在 pubspec.yaml 文件中添加以下依赖：

dependencies:
  flutter:
    sdk: flutter
  path: 1.6.2
  path_provider: 0.5.0+1
  flutter_file_extention: ^0.2.0

然后运行 flutter pub get 来安装依赖。

2. 配置权限

在 android/app/src/main/AndroidManifest.xml 中添加读写存储权限：

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

此外，确保手动授予存储权限，或者通过 simple_permissions 插件自动请求权限：

SimplePermissions.requestPermission(Permission.ReadExternalStorage);

示例代码

以下是一个完整的示例，展示如何使用 flutter_file_extention 来搜索文件并显示其扩展名。

// framework
import 'dart:async';

import 'package:flutter/material.dart';

// packages
import 'package:path_provider/path_provider.dart';
import 'package:flutter_file_extention/flutter_file_extention.dart';
import 'package:simple_permissions/simple_permissions.dart';

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

class MyApp extends StatefulWidget {
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  [@override](/user/override)
  Widget build(BuildContext context) {
    // 请求存储权限
    SimplePermissions.requestPermission(Permission.ReadExternalStorage);

    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text("Flutter 文件管理器示例"),
        ),
        body: FutureBuilder(
          future: _files(),
          builder: (BuildContext context, AsyncSnapshot snapshot) {
            if (snapshot.connectionState == ConnectionState.done) {
              return ListView.builder(
                itemCount: snapshot.data?.length ?? 0,
                itemBuilder: (context, index) {
                  return ListTile(
                    title: Text(snapshot.data[index].path.split('/').last),
                  );
                },
              );
            } else if (snapshot.connectionState == ConnectionState.waiting) {
              return Center(child: Text("加载中..."));
            }
          },
        ),
      ),
    );
  }

  // 获取外部存储目录中的所有文件
  _files() async {
    var root = await getExternalStorageDirectory();
    var files = await FileManager(root: root).walk().toList();
    return files;
  }
}

功能示例

以下是一个更复杂的示例，展示如何搜索文件并显示其详细信息，包括扩展名。

// framework
import 'dart:async';

import 'package:flutter/material.dart';

// packages
import 'package:flutter_file_extention/flutter_file_extention.dart';
import 'package:flutter_file_extention/utils.dart';

import 'package:path/path.dart' as p;

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

[@immutable](/user/immutable)
class MyApp extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return new MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text("Flutter 文件管理器演示"),
        ),
        body: FutureBuilder(
          future: _search(),
          builder: (BuildContext context, AsyncSnapshot snapshot) {
            switch (snapshot.connectionState) {
              case ConnectionState.none:
                return Center(child: Text('按下按钮开始。'));
              case ConnectionState.active:
                return Center(child: Text('活动状态...'));
              case ConnectionState.waiting:
                return Center(child: Text('等待结果...'));
              case ConnectionState.done:
                if (snapshot.hasError)
                  return Text('错误: ${snapshot.error}');
                return snapshot.data != null
                    ? ListView.builder(
                        itemCount: snapshot.data.length,
                        itemBuilder: (context, index) => Card(
                            child: ListTile(
                          title: Column(
                            children: [
                              Text('大小: ${snapshot.data[index].statSync().size}'),
                              Text('路径: ${snapshot.data[index].path}'),
                              Text('修改日期: ${snapshot.data[index].statSync().modified.toUtc()}')
                            ],
                          ),
                          subtitle: Text(
                              "扩展名: ${p.extension(snapshot.data[index].absolute.path).replaceFirst('.', '')}"), // 获取扩展名
                        )))
                    : Center(
                        child: Text("无数据！"),
                      );
            }
            return null; // 不可到达
          },
        ),
      ),
    );
  }

  Future _search() async {
    var root = await getStorageList();
    var fm = FileManager(
      root: root[1],
    );

    List founds = await fm
        .search(
          // 搜索关键字
          "android",
          sortedBy: FlutterFileUtilsSorting.Size,
        )
        .toList();
    return founds;
  }
}