从内容URI获取目录路径 [英] Get directory path from content URI

问题描述

我正在使用SDK的 ACTION_OPEN_DOCUMENT_TREE 目的是让用户选择目录.这是代码:

I'm using the SDK's ACTION_OPEN_DOCUMENT_TREE intent to let the user select a directory. Here's the code:

private static final int REQUEST_PICK_FOLDER = 1;

// …

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case R.id.action_add_folder: {
            Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT_TREE);
            startActivityForResult(intent, REQUEST_PICK_FOLDER);
            return true;

        default:
            return super.onOptionsItemSelected(item);
    }
}

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == REQUEST_PICK_FOLDER && resultCode == Activity.RESULT_OK) {
        addFolder(data.getData());
    }
}

private void addFolder(Uri uri) {
    Uri docUri = DocumentsContract.buildDocumentUriUsingTree(uri, DocumentsContract.getTreeDocumentId(uri));
    Log.d(TAG, "Folder added: " + docUri.toString());
}

我有一个URI(可能)指向我刚刚选择的文件夹.这是示例输出:添加的文件夹:content://com.android.externalstorage.documents/tree/FF30-E80D%3AImages/document/FF30-E80D%3AImages .

I have an URI (probably) pointing to the folder I just selected. Here's an example output: Folder added: content://com.android.externalstorage.documents/tree/FF30-E80D%3AImages/document/FF30-E80D%3AImages.

现在，我需要获取绝对路径，在这种情况下，该内容会转换为/storage/sdcard1/Images .我在中找到了一些代码aFileChooser 似乎有效，但不适用于SD卡，这是我的主要用例.

Now, I need to get the absolute path, something translating in this case to /storage/sdcard1/Images. I found some code in aFileChooser which seems to work, but not for SD cards, which is my main use case.

我可能会在％3A 上拆分URI，如果前面的部分是"primary"，则使用第一个外部存储路径，如果还有其他原因，请使用第二个外部存储路径，但是错误的…可能有确定性更高的方法来实现这一目标?

I could probably split the URI on %3A, if the preceding part is "primary", then use the first external storage path, if it's something else, use the second one, but it feels wrong… There's probably a more deterministic way to achieve this?

这是一些背景知识.我不需要管理文件的路径.但是如何向用户展示呢?我绝对不能告诉他 content://com.android.externalstorage.documents/tree/FF30-E80D%3AImages/document/FF30-E80D%3AImages ，这太可怕了.

here's some background on this. I don't need the path to manage the files. But how to present this to the user? I definitely can't show him content://com.android.externalstorage.documents/tree/FF30-E80D%3AImages/document/FF30-E80D%3AImages, that's just scary.

推荐答案

现在，我需要获取绝对路径，在这种情况下，该内容会转换为/storage/sdcard1/Images.

Now, I need to get the absolute path, something translating in this case to /storage/sdcard1/Images.

那是不可能的.完全不需要 Uri 指向文件，更不用说您可以访问的文件了.

That is not possible. There is no requirement that the Uri point to a file at all, let alone a file that you can access.

使用 ContentResolver 和 openInputStream()获得内容上的 InputStream 并以这种方式读取.这与您处理Web服务器URL的方式没有明显不同(使用 HttpUrlConnection 在网页或其他内容上获取 InputStream ).

Use a ContentResolver and openInputStream() to get an InputStream on the content and read it in that way. This is not significantly different than how you would handle a URL to a Web server (use HttpUrlConnection to get an InputStream on the Web page or other content).

但是如何向用户展示呢?

But how to present this to the user?

我不知道这个"是什么.但是，您可以获取与内容相关的建议显示名称.

I don't know what "this" is. However, you can get the suggested display name associated with the content.

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