如何删除文件属性谷歌驱动器

Question

I try to delete a file property as follows, but the deletion does not occur.

            File file = drive.files()
                    .get(fileId)
                    .setFields("properties")
                    .execute();
            Map<String, String> fileProperties = file.getProperties();
            for (Map.Entry<String, String> entry : fileProperties.entrySet()) {
                if (entry.getKey().contains(PermissionTypeEnum.USER.name()) || entry.getKey().contains(PermissionTypeEnum.GROUP.name())
                        || entry.getKey().contains(PermissionTypeEnum.ROLE.name()) || entry.getKey().contains(PermissionTypeEnum.DEPARTMENT.name())) {
                    entry.setValue(null);
                }
            }
            file.setProperties(fileProperties);
            drive.files().update(fileId, file).execute();

How do I delete file properties?

Answer 1

In order to remove a specific property for a file using the Drive API v3, you will have to make use of setAppProperties method.

According to the Java library for Drive API v3 documentation here :

setAppProperties > A collection of arbitrary key-value pairs which are private to the requesting app. Entries with null values are cleared in update and copy requests.

Parameters: appProperties - appProperties or null for none

Therefore, you will have to change this line:

 file.setProperties(fileProperties);

To this:

file.setAppProperties(fileProperties);

Reference

• Java library for Drive API v3 .