根据文档RELATIVE_PATH在API级别29中添加public static final String RELATIVE_PATH此媒体项在其持久化的存储设备中的相对路径。例如，存储在/storage/0000 - 0000/DCIM/Vacation/IMG1024.JPG的项目将具有DCIM/Vacation/的路径。
如何组织在Android Q Afaik之前插入到Android上MediaStore的媒体文件：PRIMARY_DIRECTORY不工作put(MediaStore.MediaColumns.PRIMARY_DIRECTORY, relativePath)根据文档它已被删除

/**
 * The primary directory name this media exists under. The value may be
 * {@code NULL} if the media doesn't have a primary directory name.
 *
 * @removed
 * @deprecated Replaced by {@link #RELATIVE_PATH}.
 */
@Column(Cursor.FIELD_TYPE_STRING)
@Deprecated
public static final String PRIMARY_DIRECTORY = "primary_directory";