如何在android Q中的specifics文件夹上授予完全的写入/读取文件访问权限 [英] how to grant full Write/Read files access on specifics folder in android Q

问题描述

我注意到我在Android Q上的程序无法创建任何文件夹或保存并打开文件.
我已经阅读了Google的文档，但没有找到答案，或者至少我不理解，因为其中有非常小的示例代码，并且据我所知，每次创建文件时，都需要打开一个特殊的窗口
有人可以告诉我如何获得对SD卡中特殊文件夹的完整访问权限?我不想每次都打开一个不同的窗口并确认

解决方案

长期而言，您无法强迫用户向您提供对外部存储中 test/目录的访问权限.

您有三个主要选择.

您可以使用 getExternalFilesDir()， getExternalCacheDir()或 getExternalMediaDir().这些是 Context 上的方法，它们每个都返回一个 File ，该文件指向您具有完全读写文件系统访问权限的外部存储上的目录.从用户的角度来看，它们将位于 Android/data/.../下，其中 ... 是您的应用程序ID.

或者，您可以使用 ACTION_OPEN_DOCUMENT_TREE 和Storage Access Framework.将 startActivityForResult()与 ACTION_OPEN_DOCUMENT_TREE Intent 一起使用将为您提供 Uri ，它指向文档树，这可能会在外部存储，可移动存储或云中.您可以在 ContentResolver 上调用 takePersistableUriPermission()以获取对该树的长期访问，还可以使用 DocumentFile.fromTreeUri()与那棵​​树一起工作.但是，这不是文件系统访问权限-它更接近于使用Web服务器.

或者，您可以将 android:requestLegacyExternalStorage ="true" 添加到清单中的< application> 元素中.这将为您提供Android Q设备上的旧文件系统行为.按计划将其删除以用于Android R，因此这不是一个合适的长期解决方案.

我在博客中谈到了今年Android Q存储的巨大变化；这是我的最新文章?.

I noticed that my program on Android Q can not create any folder or save and open a file.
I've read Google's documentation but I did not find the answer or at least I did not understand Because there is a very small sample code, and as I figured out, every time you create a file, you need to open a special window
Someone can tell me how can I get a full access for special folder in sdcard? I do not want to open a different window every time and confirm it

解决方案

Long term, you have no means of forcing the user to give you access to a test/ directory on external storage.

You have three main options.

You can use getExternalFilesDir(), getExternalCacheDir(), or getExternalMediaDir(). These are methods on Context, and they each return a File pointing to a directory on external storage for which you have full read-write filesystem access. From the user's standpoint, these will be under Android/data/.../, where ... is your application ID.

Or, you can use ACTION_OPEN_DOCUMENT_TREE and the Storage Access Framework. Using startActivityForResult() with an ACTION_OPEN_DOCUMENT_TREE Intent will give you a Uri that points to a document tree, which may be on external storage, removable storage, or in the cloud. You can call takePersistableUriPermission() on a ContentResolver to get long-term access to that tree, and you can use DocumentFile.fromTreeUri() to work with that tree. However, this is not filesystem access — it is a bit closer to working with a Web server.

Or, you can add android:requestLegacyExternalStorage="true" to your <application> element in the manifest. This will give you legacy filesystem behavior on Android Q devices. This is scheduled to be removed for Android R, so this is not a suitable long-term solution.

I blogged about the Android Q storage changes a lot this year; here is my last(?) post on it.

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