Flutter存储设备信息获取插件storage_info的使用

storage_info 插件可以帮助你获取设备内部存储和外部存储（SD卡）的空闲、已用和总磁盘空间信息。本文将详细介绍如何使用该插件，并提供一个完整的示例代码。

安装

首先，在你的 pubspec.yaml 文件中添加 storage_info 作为依赖：

dependencies:
  flutter:
    sdk: flutter
  storage_info: ^latest_version

请确保将 latest_version 替换为最新的版本号。你可以通过以下命令来获取最新版本：

flutter pub outdated

然后运行以下命令来安装依赖：

flutter pub get

使用示例

导入包

在你的 Dart 文件中导入 storage_info 包：

import 'package:storage_info/storage_info.dart';

获取内部存储信息

你可以使用 StorageInfo 类来获取内部存储的总空间、空闲空间和已用空间。这些方法返回的数据单位可以是字节、MB 或 GB。

示例代码

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

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

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

class _MyAppState extends State<MyApp> {
  Future<Map<String, dynamic>> _getInternalStorageInfo() async {
    final totalSpace = await StorageInfo.getStorageTotalSpaceInGB;
    final freeSpace = await StorageInfo.getStorageFreeSpaceInGB;
    final usedSpace = await StorageInfo.getStorageUsedSpaceInGB;

    return {
      'totalSpace': totalSpace,
      'freeSpace': freeSpace,
      'usedSpace': usedSpace,
    };
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Storage Info Example'),
        ),
        body: FutureBuilder(
            future: _getInternalStorageInfo(),
            builder: (context, snapshot) {
              if (snapshot.hasData) {
                final data = snapshot.data;
                return Center(
                  child: Column(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: [
                      Text('Total Space: ${data['totalSpace']} GB'),
                      Text('Free Space: ${data['freeSpace']} GB'),
                      Text('Used Space: ${data['usedSpace']} GB'),
                    ],
                  ),
                );
              } else if (snapshot.hasError) {
                return Center(child: Text('Error: ${snapshot.error}'));
              } else {
                return Center(child: CircularProgressIndicator());
              }
            }),
      ),
    );
  }
}

获取外部存储信息

同样地，你可以使用 StorageInfo 类来获取外部存储（SD卡）的总空间、空闲空间和已用空间。

示例代码

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

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

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

class _MyAppState extends State<MyApp> {
  Future<Map<String, dynamic>> _getExternalStorageInfo() async {
    final totalSpace = await StorageInfo.getExternalStorageTotalSpaceInGB;
    final freeSpace = await StorageInfo.getExternalStorageFreeSpaceInGB;
    final usedSpace = await StorageInfo.getExternalStorageUsedSpaceInGB;

    return {
      'totalSpace': totalSpace,
      'freeSpace': freeSpace,
      'usedSpace': usedSpace,
    };
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Storage Info Example'),
        ),
        body: FutureBuilder(
            future: _getExternalStorageInfo(),
            builder: (context, snapshot) {
              if (snapshot.hasData) {
                final data = snapshot.data;
                return Center(
                  child: Column(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: [
                      Text('Total Space: ${data['totalSpace']} GB'),
                      Text('Free Space: ${data['freeSpace']} GB'),
                      Text('Used Space: ${data['usedSpace']} GB'),
                    ],
                  ),
                );
              } else if (snapshot.hasError) {
                return Center(child: Text('Error: ${snapshot.error}'));
              } else {
                return Center(child: CircularProgressIndicator());
              }
            }),
      ),
    );
  }
}

总结

通过 storage_info 插件，你可以轻松地获取设备的内部存储和外部存储的信息。上述示例代码展示了如何使用 FutureBuilder 来异步获取并显示存储信息。希望这篇文章对你有所帮助！如果你有任何问题或建议，请随时留言。