Flutter存储管理插件storage_utility_foundation的使用

storage_utility_foundation 是 storage_utility 插件在 iOS 和 macOS 平台上的实现。该插件用于帮助开发者管理和操作存储空间。

使用

此包被标记为推荐插件，这意味着你可以直接使用 storage_utility 而无需单独添加到你的 pubspec.yaml 文件中。当你使用 storage_utility 时，此包会自动包含在内。

然而，如果你需要导入此包以直接使用其 API，则应将其添加到你的 pubspec.yaml 文件中。

以下是一个完整的示例演示如何使用 storage_utility 来获取设备的总存储空间和可用存储空间：

import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
import 'package:path_provider/path_provider.dart';
import 'package:storage_utility_platform_interface/storage_utility_platform_interface.dart';

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

class MyApp extends StatefulWidget {
  const MyApp({super.key});

  [@override](/user/override)
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  // 创建一个 StorageUtilityPlatform 实例
  final StorageUtilityPlatform utility = StorageUtilityPlatform.instance;

  // 用于格式化数字
  final NumberFormat _format = NumberFormat.decimalPattern();

  // 存储路径、总字节数和可用字节数
  String? _docPath;
  int? _totalBytes;
  int? _freeBytes;

  // 获取总字节数的方法
  void getTotalBytes() {
    utility
        .getTotalBytes(path: _docPath!)
        .then((value) => setState(() => _totalBytes = value));
  }

  // 获取可用字节数的方法
  void getFreeBytes() {
    utility
        .getFreeBytes(path: _docPath!)
        .then((value) => setState(() => _freeBytes = value));
  }

  // 初始化状态
  [@override](/user/override)
  void initState() {
    super.initState();
    // 获取应用文档目录路径
    getApplicationDocumentsDirectory().then((value) {
      setState(() {
        _docPath = value.path;
      });
      // 获取总字节数
      getTotalBytes();
      // 获取可用字节数
      getFreeBytes();
    });
  }

  // 构建界面
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Storage Utility 示例应用'),
        ),
        body: Column(
          children: [
            const SizedBox(height: 32),
            // 显示总字节数
            Text('总字节数: ${_format.format(_totalBytes ?? 0)} 字节'),
            const SizedBox(height: 16),
            // 显示可用字节数
            Text('可用字节数: ${_format.format(_freeBytes ?? 0)} 字节'),
            const SizedBox(height: 32),
            // 按钮组，用于重新获取总字节数和可用字节数
            Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                ElevatedButton(
                    onPressed: _docPath == null ? null : getTotalBytes,
                    child: const Text('获取总字节数')),
                const SizedBox(width: 16),
                ElevatedButton(
                  onPressed: _docPath == null ? null : getFreeBytes,
                  child: const Text('获取可用字节数'),
                ),
              ],
            )
          ],
        ),
      ),
    );
  }
}

示例代码解释

1. 导入必要的库

   import 'package:flutter/material.dart';
   import 'package:intl/intl.dart';
   import 'package:path_provider/path_provider.dart';
   import 'package:storage_utility_platform_interface/storage_utility_platform_interface.dart';
   

2. 初始化应用

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

3. 创建主应用类

   class MyApp extends StatefulWidget {
     const MyApp({super.key});
   
     [@override](/user/override)
     State<MyApp> createState() => _MyAppState();
   }
   

4. 定义状态管理类

   class _MyAppState extends State<MyApp> {
     final StorageUtilityPlatform utility = StorageUtilityPlatform.instance;
     final NumberFormat _format = NumberFormat.decimalPattern();
     String? _docPath;
     int? _totalBytes;
     int? _freeBytes;
   

5. 获取总字节数

   void getTotalBytes() {
     utility
         .getTotalBytes(path: _docPath!)
         .then((value) => setState(() => _totalBytes = value));
   }
   

6. 获取可用字节数

   void getFreeBytes() {
     utility
         .getFreeBytes(path: _docPath!)
         .then((value) => setState(() => _freeBytes = value));
   }
   

7. 初始化状态

   [@override](/user/override)
   void initState() {
     super.initState();
     getApplicationDocumentsDirectory().then((value) {
       setState(() {
         _docPath = value.path;
       });
       getTotalBytes();
       getFreeBytes();
     });
   }
   

8. 构建用户界面

   [@override](/user/override)
   Widget build(BuildContext context) {
     return MaterialApp(
       home: Scaffold(
         appBar: AppBar(
           title: const Text('Storage Utility 示例应用'),
         ),
         body: Column(
           children: [
             const SizedBox(height: 32),
             Text('总字节数: ${_format.format(_totalBytes ?? 0)} 字节'),
             const SizedBox(height: 16),
             Text('可用字节数: ${_format.format(_freeBytes ?? 0)} 字节'),
             const SizedBox(height: 32),
             Row(
               mainAxisAlignment: MainAxisAlignment.center,
               children: [
                 ElevatedButton(
                     onPressed: _docPath == null ? null : getTotalBytes,
                     child: const Text('获取总字节数')),
                 const SizedBox(width: 16),
                 ElevatedButton(
                   onPressed: _docPath == null ? null : getFreeBytes,
                   child: const Text('获取可用字节数'),
                 ),
               ],
             )
           ],
         ),
       ),
     );
   }