应用程序的个人文件夹路径在哪里 [英] Where is the app Personal Folder path

问题描述

我正在尝试创建sqlLite数据库.这段代码可以工作并创建数据库，并允许我进行插入和选择.

Im trying to create a sqlLite db. This code works and create the db and allow me do insert and select.

string dbPath = Path.Combine(
System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal), 
                                 "ormdemo.db3");

//dbPath = "/storage/emulated/0/DCIM/ormdemo.db3";

var db = new SQLiteConnection(dbPath);
db.CreateTable<Stock>();

现在返回的dbPath是:

Right now the dbPath returned is:

"/data/user/0/MyFirstGPSApp.MyFirstGPSApp/files/ormdemo.db3"

但是当我使用sqlLite Manager尝试打开数据库时，找不到文件夹/data/user

But when I use a sqlLite Manager to try open the db I cant find the folder /data/user

文件夹/data/user在哪里?

Where is that folder /data/user?

sqlLite可以选择打开"APP"数据库，但是当尝试选择MyFirstGPSApp时说需要一个根设备.

The sqlLite have the option to open "APP" databases, but when try to select MyFirstGPSApp say need a root device.

sqlLite的起始文件夹为/storage/emulated/0，并具有子文件夹/DCIM

The starting folder for sqlLite is /storage/emulated/0 and have a sub folder /DCIM

所以我尝试使用一个我可以看到的文件夹，例如/storage/emulated/0/DCIM/ormdemo.db3，但随后new SQLiteConnection(dbPath)给我这个错误.

So I try to use a folder I can see ... like /storage/emulated/0/DCIM/ormdemo.db3 but then the new SQLiteConnection(dbPath) give me this error.

SQLite.SQLiteException:无法打开数据库文件:/storage/emulated/0/DCIM/ormdemo.db3(CannotOpen)

SQLite.SQLiteException: Could not open database file: /storage/emulated/0/DCIM/ormdemo.db3 (CannotOpen)

在/DCIM文件夹中写入是否需要特殊的权限?

Do I need special permision to write in /DCIM folder?

推荐答案

好的，您的帖子中有三个问题.在回答您的问题之前，我认为需要一些图片.

Ok, there are three questions in your post. Before answer your questions, I think some pictures are necessary.

P1:

P2:

就像@Yogesh Paliyal所说，您需要File Explorer才能看到它.如果您也想看到它，并且不想让您的设备成为root用户，请关注我:Visual Studio->Tools->Android->Android Device Monitor->select one simulator from Devices column->File Explorer.我建议您创建一个Api低于21的模拟器，因为更高的模拟器也看不到该文件.我正在使用19来查看文件.

Like @Yogesh Paliyal has said, you need File Explorer to see it. If you also want to see it and you don't want to root you device, please follow me: Visual Studio->Tools->Android->Android Device Monitor->select one simulator from Devices column->File Explorer. I suggest you create a simulator which Api is below 21, because the higher also can't see the file. I am using 19 to see the files.

我认为您应该阅读此首先.

And I think you should read this firstly.

好，让我们看看您的问题:

Ok, let's see your questions:

应用的个人文件夹"路径在哪里?

Where is the app Personal Folder path?

在android中，有两个文件夹:个人/内部文件夹和公共/外部文件夹，

In android, there are two folder: personal/internal folder and public/external folder, here is official document.

个人/内部文件夹路径:

Personal/Internal Folder path:

• /数据/数据/包名称/shared_prefs: SharedPreferences

/data/data/程序包名称/数据库:

/data/data/package name/databases: Sqlite

/数据/数据/包名称/文件: Api: getFilesDir()

/data/data/package name/files: Api:getFilesDir()

/数据/数据/包名称/缓存: Api: getCacheDir()

/data/data/package name/cache: Api:getCacheDir()

/storage/sdcard/Android/data/程序包名称/文件:

/storage/sdcard/Android/data/package name/files: Api:getExternalFilesDir()

/storage/sdcard/Android/data/程序包名称/缓存:

/storage/sdcard/Android/data/package name/cache: Api:getExternalCacheDir()

公共/外部文件夹路径:

Public/External Folder path:

• 在/storage/sdcard文件夹中，只有Android文件夹是个人/内部文件夹，因此/storage/sdcard/DCIM，/storage/sdcard/Music等，它们都是公共/外部文件夹:

• In /storage/sdcard folder, only Android folder is personal/internal folder,so /storage/sdcard/DCIM, /storage/sdcard/Music,etc, all of them are public/external folder: Api:Environment.getExternalStoragePublicDirectory(String type)

该文件夹/data/user在哪里?

Where is that folder /data/user?

在P1中，您可以看到->/data/data/在/data/user/0的后面，因此文件夹/data/user/0/MyFirstGPSApp.MyFirstGPSApp/files/ormdemo.db3实际上是/data/data/MyFirstGPSApp.MyFirstGPSApp/files/ormdemo.db3.

From P1, you can see the ->/data/data/ is behind of /data/user/0, so the folder /data/user/0/MyFirstGPSApp.MyFirstGPSApp/files/ormdemo.db3 is /data/data/MyFirstGPSApp.MyFirstGPSApp/files/ormdemo.db3 actually.

我需要特殊的权限才能写入/DCIM文件夹吗?

Do I need special permision to write in /DCIM folder?

个人/内部文件夹不需要权限，公共/外部文件夹需要权限.

Personal/Internal folder doesn't need permission, public/external folder need permission.

在/storage/sdcard文件夹中，只有Android文件夹是个人/内部文件夹，因此您需要权限:<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />或<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />或二者兼有.

In /storage/sdcard folder, only Android folder is personal/internal folder, so you need permission:<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> or <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> or both.

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