要获取从“打开文档树”意图中选择的存储位置的路径，可以使用以下代码示例：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
    if (requestCode == PICK_DOC_REQUEST && resultCode == RESULT_OK && intent.getData() != null) {
        Uri uriTree = intent.getData();

        // Check for the "DocumentProvider" authority
        if (DocumentsContract.isDocumentUri(this, uriTree)) {
            // The document provider was selected
            String docId = DocumentsContract.getTreeDocumentId(uriTree);

            // Get complete Uri of this document by adding document id to the tree Uri
            Uri uri = DocumentsContract.buildDocumentUriUsingTree(uriTree, docId);

            // Get details about the selected directory, including its document id and display name
            String [] projection = {DocumentsContract.Document.COLUMN_DOCUMENT_ID,
                                    DocumentsContract.Document.COLUMN_DISPLAY_NAME};
            Cursor cursor = getContentResolver().query(uri, projection, null, null, null);

            if (cursor != null && cursor.moveToFirst()) {
                String folderDocumentId = cursor.getString(0);
                String folderName = cursor.getString(1);

                // Use folderDocumentId and folderName
                Log.d(TAG, "Folder Document Id: " + folderDocumentId);
                Log.d(TAG, "Folder Name: " + folderName);
            }

            if (cursor != null) {
                cursor.close();
            }
        }
    } else {
        super.onActivityResult(requestCode, resultCode, intent);
    }
}

其中， PICK_DOC_REQUEST是一个用于标识请求代码的整数常量，应该在启动 ACTION_OPEN_DOCUMENT_TREE 意图时使用。

此代码将检查获取的 Uri 是否属于“文件提供者”，获取所选目录的详细信息，并从中提取必要的信息。此时，您可以使用 folderDocumentId 来获取完整的 Uri 并进行其他操作。