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MediaMetadata

class MediaMetadata : CustomVersionedParcelable
androidx.media2.common.MediaMetadata

Contains metadata about an item, such as the title, artist, etc. This is optional, but you'd better to provide this as much as possible when you're using media widget and/or session APIs.

The media widget components build its UI based on the metadata here. For an example, androidx.media2.widget.MediaControlView will show title from the metadata.

The androidx.media2.session.MediaLibraryService.MediaLibrarySession would require some metadata values when it provides MediaItems to androidx.media2.session.MediaBrowser.

Topics covered here:

  1. Media ID
  2. Browsable type
  3. Playable
  4. Duration
  5. User rating

Media ID

If set, the media ID must be the persistent key for the underlying media contents, so androidx.media2.session.MediaController and androidx.media2.session.MediaBrowser can store the information and reuse it later. Some APIs requires a media ID (e.g. androidx.media2.session.MediaController#setRating, so you'd better specify one.

Typical example of using media ID is the URI of the contents, but use it with the caution because the metadata is shared across the process in plain text.

The androidx.media2.session.MediaLibraryService.MediaLibrarySession would require it for the library root, so androidx.media2.session.MediaBrowser can call subsequent androidx.media2.session.MediaBrowser#getChildren with the ID.

Browsable type

Browsable defines whether the media item has children and type of children if any. With this, androidx.media2.session.MediaBrowser can know whether the subsequent androidx.media2.session.MediaBrowser#getChildren would successfully run.

The androidx.media2.session.MediaLibraryService.MediaLibrarySession would require the explicit browsable type for the media items returned by the androidx.media2.session.MediaLibraryService.MediaLibrarySession.MediaLibrarySessionCallback.

Playable type

Playable defines whether the media item can be played or not. It may be possible for a playlist to contain a media item which isn't playable in order to show a disabled media item.

The androidx.media2.session.MediaLibraryService.MediaLibrarySession would require the explicit playable value for the media items returned by the androidx.media2.session.MediaLibraryService.MediaLibrarySession.MediaLibrarySessionCallback.

Duration

The duration is the length of the contents. The androidx.media2.session.MediaController can only get the duration through the metadata. This tells when would the playback ends, and also tells about the allowed range of androidx.media2.session.MediaController#seekTo(long).

If it's not set by developer, androidx.media2.session.MediaSession would update the duration in the metadata with the SessionPlayer#getDuration().

User rating

Prefer to have unrated user rating instead of null, so androidx.media2.session.MediaController can know the possible user rating type for calling androidx.media2.session.MediaController#setRating(String, Rating).

Summary

Nested classes

Use to build MediaMetadatax objects.

Constants
static Long

The type of browsable that contains browsable items categorized by album.

static Long

The type of browsable that contains browsable items categorized by artist.

static Long

The type of browsable that contains browsable items categorized by genre.

static Long

The type of browsable that is unknown or contains media items of mixed types.

static Long

The type of browsable for non-browsable media item.

static Long

The type of browsable that contains browsable items categorized by playlist.

static Long

The type of browsable that only contains playable media items.

static Long

The type of browsable that contains browsable items categorized by year.

static String

The metadata key for a Long typed value to retrieve the information about whether the media is an advertisement.

static String

The metadata key for a CharSequence or String typed value to retrieve the information about the album title for the media.

static String

The metadata key for a Bitmap typed value to retrieve the information about the artwork for the album of the media's original source.

static String

The metadata key for a CharSequence or String typed value to retrieve the information about the artist for the album of the media's original source.

static String

The metadata key for a CharSequence or String typed value to retrieve the information about the Uri of the artwork for the album of the media's original source.

static String

The metadata key for a Bitmap typed value to retrieve the information about the artwork for the media.

static String

The metadata key for a CharSequence or String typed value to retrieve the information about the artist of the media.

static String

The metadata key for a CharSequence or String typed value to retrieve the information about Uri of the artwork for the media.

static String

The metadata key for a CharSequence or String typed value to retrieve the information about the author of the media.

static String

The metadata key for a Long typed value to retrieve the information about the type of browsable.

static String

The metadata key for a CharSequence or String typed value to retrieve the information about the compilation status of the media.

static String

The metadata key for a CharSequence or String typed value to retrieve the information about the composer of the media.

static String

The metadata key for a CharSequence or String typed value to retrieve the information about the date the media was created or published.

static String

The metadata key for a Long typed value to retrieve the information about the disc number for the media's original source.

static