Question

在android中，我们使用getFileDir()和getCacheDir()来访问Internal Storage。我可以看到有一个path_provider插件可以使用，但我只能找出getTemporaryDirectory()，它类似于android的getCacheDir()。因此，有没有其他替代方法可以完成getFileDir()在Android中的工作。

我是否知道有其他方法可以执行此操作，或者我丢失了什么内容？

Answer 1

从Flutter来源：

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

Answer 2

使用以下飞镖包：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'),
          ],
        ) ,
      ),
    );
  }
}

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;

如何在Flutter中访问Android的内部存储

3 个答案: