将文件写入Android Q中的可公开访问的文档文件夹-范围存储 [英] Writing files to publicly accessible documents folder in Android Q - Scoped Storage

问题描述

迁移到Android Q后，我再也找不到合适的方法来获取对documents文件夹(/storage/emulated/0/Documents)的写访问权

After migrating to Android Q I can no longer find a suitable way to gain write access to the documents folder (/storage/emulated/0/Documents)

在任何人提到范围存储的其他问题之前，我已经阅读了其中的很多问题，到目前为止，从我所看到的所有解决方案中，所有解决方案都使用应用程序特定目录或仅访问媒体目录(而非文档文件夹)访问).

And before anyone mentions the many other questions on scoped storage I've read through many of them and from what I've seen so far all of the solutions use a app specific directory or accessing a media directory only (not documents folder access).

根据我对Android Q的了解，我可以选择:

• 使用只能由我的应用程序(或我允许的应用程序)访问的应用程序特定目录
• 允许用户选择要将文件存储在哪里(我认为这可以是公共位置)ACTION_OPEN_DOCUMENT_TREE

我开发的应用程序用于对主题进行测试，测试数据自动存储在可公开访问的Documents文件夹中，如下所示:/storage/emulated/0/Documents/myAppName/subjectName/testData-todaysDate.pdf

The applications I develop are used to conduct tests on subjects, the data from the tests automatically gets stored in the publicly accessible Documents folder somewhat like: /storage/emulated/0/Documents/myAppName/subjectName/testData-todaysDate.pdf

当用户想要访问测试数据时，他们将智能手机插入计算机并导航到documents文件夹，其余的工作非常明显.因此，我必须使用可公开访问的存储.还要想象他们想通过另一个应用程序"Same deal"在手机上打开测试数据！

When the user wants to access the test data they plug their smartphone into a computer and navigate to the documents folder and the rest is pretty obvious. For this reason I have to use publicly accessible storage. Also imagine they want to open the test data on their phone via another app, Same deal!

因此，我正在寻找的解决方案需要能够执行以下操作:

So the solution I'm looking for needs to be able to do the following:

• 不多次请求许可(一次可以)
• 自动保存测试数据而无需用户提示(因为将进行数百次测试)
• 保存到公共文档文件夹，例如/storage/emulated/0/Documents/
• 不涉及用户选择目录，因此不涉及ACTION_OPEN_DOCUMENT_TREE
• 理想情况下，数据是持久的，因此卸载应用程序不会导致数据丢失

• Doesn't ask for permission multiple times (once is ok)
• Automatically saves test data without user prompt (as hundreds of tests will be conducted)
• Saves to public documents folder e.g. /storage/emulated/0/Documents/
• Doesn't involve the user selecting the directory so NOT ACTION_OPEN_DOCUMENT_TREE
• Ideally the data is persistent so uninstalling the app doesn't cause data lose

我了解到，Android Q中的这些更改旨在使用户更了解应用程序访问数据的方式，但是一旦他们了解了您的应用程序如何使用数据，就不会有问题了.

I get that these changes in Android Q are to bring users more "into the loop" with how apps are accessing their data but once they understand how your app is using your data there shouldn't be a problem.

推荐答案

仅适用于Android Q.

For Android Q only.

String collection = "content://media/1c11-2404/file"; // One can even write to micro SD card
String relative_path = "Documents/MyFolder";

Uri collectionUri = Uri.parse(collection);

ContentValues contentValues = new ContentValues();

contentValues.put(MediaStore.MediaColumns.DISPLAY_NAME, displayName);
contentValues.put(MediaStore.MediaColumns.MIME_TYPE, mimeType);
contentValues.put(MediaStore.MediaColumns.SIZE, filesize);
contentValues.put(MediaStore.MediaColumns.DATE_MODIFIED, modified );
contentValues.put(MediaStore.MediaColumns.RELATIVE_PATH, relative_path);
contentValues.put(MediaStore.MediaColumns.IS_PENDING, 1)

Uri fileUri = context.getContentResolver().insert(collectionUri, contentValues);

具有uri人可以打开输出流以写入文件内容.

Having an uri one can open an output stream to write the content for the file.

这篇关于将文件写入Android Q中的可公开访问的文档文件夹-范围存储的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！