Android-存储访问框架-Uri转换为本地文件 [英] Android - Storage Access Framework - Uri into local file

问题描述

我在我的应用程序中使用Storage Access Framework(SAF).为了扫描文件(照片或文档)，我需要通过API发送本地文件路径.我已经设法正确设置了SAF，现在当用户选择一个文件时，我得到了应该的Uri.

I am using Storage Access Framework(SAF) in my app. In order to scan a file(photo or document) i need send a local file path trough an API. I've managed to setup the SAF correctly, and now when a user chooses a file and i am getting a Uri as it supposed to be.

似乎Uri是云的密钥，而不是本地文件.

As it seems the Uri is a key for the cloud and not a local file.

Uri值如下所示:

content://com.android.providers.media.documents/document/image:11862 

如何将这个Uri转换为本地文件?我应该从云端下载文件吗?我该怎么办?

How can i convert this Uri into a local file? Should i download the file from the cloud? How can i do it?

推荐答案

似乎Uri是云的密钥，而不是本地文件.

As it seems the Uri is a key for the cloud and not a local file.

Uri是对内容的不透明引用.您无法知道数据在哪里，也不必关心.

The Uri is an opaque reference to a piece of content. You have no way of knowing where the data is, nor should you care.

如何将这个Uri转换为本地文件?

How can i convert this Uri into a local file?

理想情况下，您不会.理想情况下，您可以使用支持InputStream的某些库来扫描文件(照片或文档)".在这种情况下，您可以使用ContentResolver和openInputStream()将流传递到库中.

Ideally, you don't. Ideally, you "scan a file(photo or document)" using some library that supports an InputStream. In that case, you use ContentResolver and openInputStream() to get the stream to pass to the library.

如果您的库不支持InputStream作为数据源，则您需要自己使用openInputStream()，并使用Java I/O在文件系统中将内容复制为文件，以便您通过到图书馆.

If your library does not support InputStream as a data source, you will need to use openInputStream() yourself, using Java I/O to make a copy of the content as a file in the filesystem, for you to pass to the library.

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