如何在Flutter中访问Android的内部存储

Question

在Android中，我们使用getFileDir()和getCacheDir()来访问内部存储。我看到了一个可以使用的path_provider插件，但我只能找到类似于Android中getCacheDir()的getTemporaryDirectory()。那么是否有其他方法可以实现Android中getFileDir()的功能呢？ 是否还有其他我不知道或者我遗漏了的方法可行？

- Shubhamhackz

Answer 1

获取内部存储目录路径： 对于旧版本，请使用提供外部存储路径和外部公共存储路径的Flutter插件， ext_storage：^latest_ver

String path = await ExtStorage.getExternalStoragePublicDirectory(
        ExtStorage.DIRECTORY_DOWNLOADS);

详情：https://pub.dev/packages/ext_storage

external_path:^latest_ver， 对于 NullSafety，external_path 是一个 Flutter 插件，提供了内部、外部存储路径和外部公共存储路径。

String path=await ExternalPath.getExternalStoragePublicDirectory(
        ExternalPath.DIRECTORY_DOWNLOADS);

Details:https://pub.dev/packages/external_path

- Suresh B B

Answer 2

From Flutter sources:

  /// Examples:
  ///
  ///  * iOS: `NSDocumentsDirectory`
  ///  * Android: The AppData directory.
  static Future<Directory> getApplicationDocumentsDirectory() async {
    return new Directory((await _pathProviderProxy.ptr.applicationDocumentsDirectory()).path);

- Mosbah

---

啊哈，好地方:D - Pete Houston

@Mosbah，它与getFileDir并不完全相同，因为它返回路径data/data/your_app_package/files，而getApplicationDocumentDirectory返回路径data/data/your_app_package/flutter/app_flutter，尽管我们可以使用app_flutter目录代替files而不会出现任何问题。 - Shubhamhackz

@Mosbah，你能提供一下你代码的完整示例吗？因为我尝试了你的代码，但我需要定义_pathProviderProxy。 - wahyu

Answer 3

将path_provider添加到pubspec.yaml

import 'package:path_provider/path_provider.dart';

Future<String> get _localPath async {
  final directory = await getApplicationDocumentsDirectory();

  return directory.path;
}

final directory = await _localPath;

- aeviou

Answer 4

(此软件包已过时，与Flutter的最新版本不兼容)

请使用此Dart软件包：https://pub.dev/packages/path_provider_ex#-example-tab-

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

import 'package:flutter/services.dart';
import 'package:path_provider_ex/path_provider_ex.dart';

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

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

class _MyAppState extends State<MyApp> {
  List<StorageInfo> _storageInfo = [];

  @override
  void initState() {
    super.initState();
    initPlatformState();
  }

  // Platform messages are asynchronous, so we initialize in an async method.
  Future<void> initPlatformState() async {
    List<StorageInfo> storageInfo;
    // Platform messages may fail, so we use a try/catch PlatformException.
    try {
      storageInfo = await PathProviderEx.getStorageInfo();
    } on PlatformException {}

    // If the widget was removed from the tree while the asynchronous platform
    // message was in flight, we want to discard the reply rather than calling
    // setState to update our non-existent appearance.
    if (!mounted) return;

    setState(() {
      _storageInfo = storageInfo;
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
        ),
        body: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: <Widget>[
            Text(
                'Internal Storage root:\n ${(_storageInfo.length > 0) ? _storageInfo[0].rootDir : "unavailable"}\n'),
            Text(
                'Internal Storage appFilesDir:\n ${(_storageInfo.length > 0) ? _storageInfo[0].appFilesDir : "unavailable"}\n'),
            Text(
                'Internal Storage AvailableGB:\n ${(_storageInfo.length > 0) ? _storageInfo[0].availableGB : "unavailable"}\n'),
            Text(
                'SD Card root: ${(_storageInfo.length > 1) ? _storageInfo[1].rootDir : "unavailable"}\n'),
            Text(
                'SD Card appFilesDir: ${(_storageInfo.length > 1) ? _storageInfo[1].appFilesDir : "unavailable"}\n'),
            Text(
                'SD Card AvailableGB:\n ${(_storageInfo.length > 1) ? _storageInfo[1].availableGB : "unavailable"}\n'),
          ],
        ) ,
      ),
    );
  }
}

- Dilanka Fernando