如何在 Flutter 中访问 Android 的内部存储
How to access Internal Storage of Android in Flutter
在 android 中,我们使用 getFileDir()
和 getCacheDir()
来访问 Internal Storage
。我可以看到有一个我可以使用的 path_provider
插件,但我只能弄清楚 getTemporaryDirectory()
,它类似于 android 的 getCacheDir()
。那么有没有其他方法可以做 getFileDir()
在 Android.
中所做的事情
有没有其他我知道的方法可以做到这一点,或者我遗漏了什么。
来自 Flutter 来源:
/// Examples:
///
/// * iOS: `NSDocumentsDirectory`
/// * Android: The AppData directory.
static Future<Directory> getApplicationDocumentsDirectory() async {
return new Directory((await _pathProviderProxy.ptr.applicationDocumentsDirectory()).path);
使用这个飞镖包: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'),
],
) ,
),
);
}
}
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;
获取内部存储目录路径:
对于 Legacy 使用这些提供外部存储路径和外部 public 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,
For NullSafetyexternal_path是一个flutter插件,提供内部、外部存储路径和外部public存储路径,
String path=await ExternalPath.getExternalStoragePublicDirectory(
ExternalPath.DIRECTORY_DOWNLOADS);
在 android 中,我们使用 getFileDir()
和 getCacheDir()
来访问 Internal Storage
。我可以看到有一个我可以使用的 path_provider
插件,但我只能弄清楚 getTemporaryDirectory()
,它类似于 android 的 getCacheDir()
。那么有没有其他方法可以做 getFileDir()
在 Android.
有没有其他我知道的方法可以做到这一点,或者我遗漏了什么。
来自 Flutter 来源:
/// Examples:
///
/// * iOS: `NSDocumentsDirectory`
/// * Android: The AppData directory.
static Future<Directory> getApplicationDocumentsDirectory() async {
return new Directory((await _pathProviderProxy.ptr.applicationDocumentsDirectory()).path);
使用这个飞镖包: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'),
],
) ,
),
);
}
}
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;
获取内部存储目录路径: 对于 Legacy 使用这些提供外部存储路径和外部 public 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, For NullSafetyexternal_path是一个flutter插件,提供内部、外部存储路径和外部public存储路径,
String path=await ExternalPath.getExternalStoragePublicDirectory(
ExternalPath.DIRECTORY_DOWNLOADS);