MediaStore.Images.Media.getContentUri(String volumeName):Uri 的作用是什么？

除了这个之外，Content Provider Media API 的公共方法对我来说看起来非常简单。我不确定这有什么作用或如何使用它。任何有关使用的见解将不胜感激。

您使用“内部”INTERNAL_CONTENT_URI和“外部”为EXTERNAL_CONTENT_URI，如源代码所示：

    /**
     * Get the content:// style URI for the image media table on the
     * given volume.
     *
     * @param volumeName the name of the volume to get the URI for
     * @return the URI to the image media table on the given volume
     */
    public static Uri getContentUri(String volumeName) {
        return Uri.parse(CONTENT_AUTHORITY_SLASH + volumeName +
                "/images/media");
    }

    /**
     * The content:// style URI for the internal storage.
     */
    public static final Uri INTERNAL_CONTENT_URI =
            getContentUri("internal");

    /**
     * The content:// style URI for the "primary" external storage
     * volume.
     */
    public static final Uri EXTERNAL_CONTENT_URI =
            getContentUri("external");

CONTENT_AUTHORITY_SLASH一样好content://media/.

public static final String AUTHORITY = "media";

private static final String CONTENT_AUTHORITY_SLASH = "content://" + AUTHORITY + "/";