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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 String

The metadata key for a CharSequence or String typed value to retrieve the information about the description that is suitable for display to the user.

static String

The metadata key for a Bitmap typed value to retrieve the information about the icon or thumbnail that is suitable for display to the user.

static String

The metadata key for a CharSequence or String typed value to retrieve the information about the Uri of icon or thumbnail that is suitable for display to the user.

static String

The metadata key for a CharSequence or String typed value to retrieve the information about the subtitle that is suitable for display to the user.

static String

The metadata key for a CharSequence or String typed value to retrieve the information about the title that is suitable for display to the user.

static String

The metadata key for a Long typed value to retrieve the information about the download status of the media which will be used for later offline playback.

static String

The metadata key for a Long typed value to retrieve the information about the duration of the media in ms.

static String

A Bundle extra.

static String

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

static String

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

static String

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

static String

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

static String

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

static String

The metadata key for a Rating typed value to retrieve the information about the overall rating for the media.

static String

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

static String

The metadata key for a Long typed value to retrieve the information about the track number for the media.

static String

The metadata key for a Rating typed value to retrieve the information about the user's rating for the media.

static String

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

static String

The metadata key for a Long typed value to retrieve the information about the year the media was created or published.

static Long

The status value to indicate the media item is downloaded for later offline playback.

static Long

The status value to indicate the media item is being downloaded.

static Long

The status value to indicate the media item is not downloaded.

Public methods
Boolean
containsKey(@NonNull key: String)

Returns true if the given key is contained in the metadata

Bitmap?
getBitmap(@NonNull key: String)

Return a Bitmap for the given key or null if no bitmap exists for the given key.

Bundle?

Get the extra Bundle from the metadata object.

Float
getFloat(@NonNull key: String)

Return the value associated with the given key, or 0.

Long
getLong(@NonNull key: String)

Returns the value associated with the given key, or 0L if no long exists for the given key.

String?

Returns the media id, or null if the id doesn't exist.

Rating?
getRating(@NonNull key: String)

Return a Rating for the given key or null if no rating exists for the given key.

String?
getString(@NonNull key: String)

Returns the value associated with the given key, or null if no mapping of the desired type exists for the given key or a null value is explicitly associated with the key.

CharSequence?
getText(@NonNull key: String)

Returns the value associated with the given key, or null if no mapping of the desired type exists for the given key or a null value is explicitly associated with the key.

MutableSet<String!>

Returns a Set containing the Strings used as keys in this metadata.

Int

Get the number of fields in this metadata.

String

Constants

BROWSABLE_TYPE_ALBUMS

static val BROWSABLE_TYPE_ALBUMS: Long

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

This value matches with the folder type 'Albums' as specified in the section 6.10.2.2 of the Bluetooth AVRCP 1.5.

Value: 2

BROWSABLE_TYPE_ARTISTS

static val BROWSABLE_TYPE_ARTISTS: Long

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

This value matches with the folder type 'Artists' as specified in the section 6.10.2.2 of the Bluetooth AVRCP 1.5.

Value: 3

BROWSABLE_TYPE_GENRES

static val BROWSABLE_TYPE_GENRES: Long

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

This value matches with the folder type 'Genres' as specified in the section 6.10.2.2 of the Bluetooth AVRCP 1.5.

Value: 4

BROWSABLE_TYPE_MIXED

static val BROWSABLE_TYPE_MIXED: Long

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

This value matches with the folder type 'Mixed' as specified in the section 6.10.2.2 of the Bluetooth AVRCP 1.5.

Value: 0

BROWSABLE_TYPE_NONE

static val BROWSABLE_TYPE_NONE: Long

The type of browsable for non-browsable media item.

Value: -1

BROWSABLE_TYPE_PLAYLISTS

static val BROWSABLE_TYPE_PLAYLISTS: Long

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

This value matches with the folder type 'Playlists' as specified in the section 6.10.2.2 of the Bluetooth AVRCP 1.5.

Value: 5

BROWSABLE_TYPE_TITLES

static val BROWSABLE_TYPE_TITLES: Long

The type of browsable that only contains playable media items.

This value matches with the folder type 'Titles' as specified in the section 6.10.2.2 of the Bluetooth AVRCP 1.5.

Value: 1

BROWSABLE_TYPE_YEARS

static val BROWSABLE_TYPE_YEARS: Long

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

This value matches with the folder type 'Years' as specified in the section 6.10.2.2 of the Bluetooth AVRCP 1.5.

Value: 6

METADATA_KEY_ADVERTISEMENT

static val METADATA_KEY_ADVERTISEMENT: String

The metadata key for a Long typed value to retrieve the information about whether the media is an advertisement. A value of 0 indicates it is not an advertisement. A value of 1 or non-zero indicates it is an advertisement. If not specified, this value is set to 0 by default.

Value: "androidx.media2.metadata.ADVERTISEMENT"

METADATA_KEY_ALBUM

static val METADATA_KEY_ALBUM: String

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

Value: android.media.MediaMetadata.METADATA_KEY_ALBUM

METADATA_KEY_ALBUM_ART

static val METADATA_KEY_ALBUM_ART: 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. The artwork should be relatively small and may be scaled down if it is too large. For higher resolution artwork, METADATA_KEY_ALBUM_ART_URI should be used instead.

Value: android.media.MediaMetadata.METADATA_KEY_ALBUM_ART

METADATA_KEY_ALBUM_ARTIST

static val METADATA_KEY_ALBUM_ARTIST: 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.

Value: android.media.MediaMetadata.METADATA_KEY_ALBUM_ARTIST

METADATA_KEY_ALBUM_ART_URI

static val METADATA_KEY_ALBUM_ART_URI: 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.

Value: android.media.MediaMetadata.METADATA_KEY_ALBUM_ART_URI

METADATA_KEY_ART

static val METADATA_KEY_ART: String

The metadata key for a Bitmap typed value to retrieve the information about the artwork for the media. The artwork should be relatively small and may be scaled down if it is too large. For higher resolution artwork, METADATA_KEY_ART_URI should be used instead.

Value: android.media.MediaMetadata.METADATA_KEY_ART

METADATA_KEY_ARTIST

static val METADATA_KEY_ARTIST: String

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

Value: android.media.MediaMetadata.METADATA_KEY_ARTIST

METADATA_KEY_ART_URI

static val METADATA_KEY_ART_URI: String

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

Value: android.media.MediaMetadata.METADATA_KEY_ART_URI

METADATA_KEY_AUTHOR

static val METADATA_KEY_AUTHOR: String

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

Value: android.media.MediaMetadata.METADATA_KEY_AUTHOR

METADATA_KEY_BROWSABLE

static val METADATA_KEY_BROWSABLE: String

The metadata key for a Long typed value to retrieve the information about the type of browsable. It should be one of the following:

The values other than BROWSABLE_TYPE_NONE mean that the media item has children.[

This matches with the bluetooth folder type of the media specified in the section 6.10.2.2 of the Bluetooth AVRCP 1.5.

Value: "androidx.media2.metadata.BROWSABLE"

METADATA_KEY_COMPILATION

static val METADATA_KEY_COMPILATION: String

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

Value: android.media.MediaMetadata.METADATA_KEY_COMPILATION

METADATA_KEY_COMPOSER

static val METADATA_KEY_COMPOSER: String

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

Value: android.media.MediaMetadata.METADATA_KEY_COMPOSER

METADATA_KEY_DATE

static val METADATA_KEY_DATE: String

The metadata key for a CharSequence or String typed value to retrieve the information about the date the media was created or published. The format is unspecified but RFC 3339 is recommended.

Value: android.media.MediaMetadata.METADATA_KEY_DATE

METADATA_KEY_DISC_NUMBER

static val METADATA_KEY_DISC_NUMBER: String

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

Value: android.media.MediaMetadata.METADATA_KEY_DISC_NUMBER

METADATA_KEY_DISPLAY_DESCRIPTION

static val METADATA_KEY_DISPLAY_DESCRIPTION: String

The metadata key for a CharSequence or String typed value to retrieve the information about the description that is suitable for display to the user. When displaying more information for media described by this metadata, this should be preferred to other fields if present.

Value: android.media.MediaMetadata.METADATA_KEY_DISPLAY_DESCRIPTION

METADATA_KEY_DISPLAY_ICON

static val METADATA_KEY_DISPLAY_ICON: String

The metadata key for a Bitmap typed value to retrieve the information about the icon or thumbnail that is suitable for display to the user. When displaying an icon for media described by this metadata, this should be preferred to other fields if present.

The icon should be relatively small and may be scaled down if it is too large. For higher resolution artwork, METADATA_KEY_DISPLAY_ICON_URI should be used instead.

Value: android.media.MediaMetadata.METADATA_KEY_DISPLAY_ICON

METADATA_KEY_DISPLAY_ICON_URI

static val METADATA_KEY_DISPLAY_ICON_URI: String

The metadata key for a CharSequence or String typed value to retrieve the information about the Uri of icon or thumbnail that is suitable for display to the user. When displaying more information for media described by this metadata, the display description should be preferred to other fields when present.

Value: android.media.MediaMetadata.METADATA_KEY_DISPLAY_ICON_URI

METADATA_KEY_DISPLAY_SUBTITLE

static val METADATA_KEY_DISPLAY_SUBTITLE: String

The metadata key for a CharSequence or String typed value to retrieve the information about the subtitle that is suitable for display to the user. When displaying a second line for media described by this metadata, this should be preferred to other fields if present.

Value: android.media.MediaMetadata.METADATA_KEY_DISPLAY_SUBTITLE

METADATA_KEY_DISPLAY_TITLE

static val METADATA_KEY_DISPLAY_TITLE: String

The metadata key for a CharSequence or String typed value to retrieve the information about the title that is suitable for display to the user. It will generally be the same as METADATA_KEY_TITLE but may differ for some formats. When displaying media described by this metadata, this should be preferred if present.

Value: android.media.MediaMetadata.METADATA_KEY_DISPLAY_TITLE

METADATA_KEY_DOWNLOAD_STATUS

static val METADATA_KEY_DOWNLOAD_STATUS: String

The metadata key for a Long typed value to retrieve the information about the download status of the media which will be used for later offline playback. It should be one of the following:

Value: "androidx.media2.metadata.DOWNLOAD_STATUS"

METADATA_KEY_DURATION

static val METADATA_KEY_DURATION: String

The metadata key for a Long typed value to retrieve the information about the duration of the media in ms. A negative duration indicates that the duration is unknown (or infinite).

Value: android.media.MediaMetadata.METADATA_KEY_DURATION

METADATA_KEY_EXTRAS

static val METADATA_KEY_EXTRAS: String

A Bundle extra.

Value: "androidx.media2.metadata.EXTRAS"

METADATA_KEY_GENRE

static val METADATA_KEY_GENRE: String

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

Value: android.media.MediaMetadata.METADATA_KEY_GENRE

METADATA_KEY_MEDIA_ID

static val METADATA_KEY_MEDIA_ID: String

The metadata key for a CharSequence or String typed value to retrieve the information about the media ID of the content. This value is specific to the service providing the content. If used, this should be a persistent key for the underlying content. This ID is used by androidx.media2.session.MediaController and androidx.media2.session.MediaBrowser.

Value: android.media.MediaMetadata.METADATA_KEY_MEDIA_ID

METADATA_KEY_MEDIA_URI

static val METADATA_KEY_MEDIA_URI: String

The metadata key for a CharSequence or String typed value to retrieve the information about the Uri of the content. This value is specific to the service providing the content.

Value: android.media.MediaMetadata.METADATA_KEY_MEDIA_URI

METADATA_KEY_NUM_TRACKS

static val METADATA_KEY_NUM_TRACKS: String

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

Value: android.media.MediaMetadata.METADATA_KEY_NUM_TRACKS

METADATA_KEY_PLAYABLE

static val METADATA_KEY_PLAYABLE: String

The metadata key for a Long typed value to retrieve the information about whether the media is playable. A value of 0 indicates it is not a playable item. A value of 1 or non-zero indicates it is playable.

Value: "androidx.media2.metadata.PLAYABLE"

METADATA_KEY_RATING

static val METADATA_KEY_RATING: String

The metadata key for a Rating typed value to retrieve the information about the overall rating for the media.

Value: android.media.MediaMetadata.METADATA_KEY_RATING

METADATA_KEY_TITLE

static val METADATA_KEY_TITLE: String

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

Value: android.media.MediaMetadata.METADATA_KEY_TITLE

METADATA_KEY_TRACK_NUMBER

static val METADATA_KEY_TRACK_NUMBER: String

The metadata key for a Long typed value to retrieve the information about the track number for the media.

Value: android.media.MediaMetadata.METADATA_KEY_TRACK_NUMBER

METADATA_KEY_USER_RATING

static val METADATA_KEY_USER_RATING: String

The metadata key for a Rating typed value to retrieve the information about the user's rating for the media. Prefer to have unrated user rating instead of null, so androidx.media2.session.MediaController can know the possible user rating type.

Value: android.media.MediaMetadata.METADATA_KEY_USER_RATING

METADATA_KEY_WRITER

static val METADATA_KEY_WRITER: String

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

Value: android.media.MediaMetadata.METADATA_KEY_WRITER

METADATA_KEY_YEAR

static val METADATA_KEY_YEAR: String

The metadata key for a Long typed value to retrieve the information about the year the media was created or published.

Value: android.media.MediaMetadata.METADATA_KEY_YEAR

STATUS_DOWNLOADED

static val STATUS_DOWNLOADED: Long

The status value to indicate the media item is downloaded for later offline playback.

Value: 2

STATUS_DOWNLOADING

static val STATUS_DOWNLOADING: Long

The status value to indicate the media item is being downloaded.

Value: 1

STATUS_NOT_DOWNLOADED

static val STATUS_NOT_DOWNLOADED: Long

The status value to indicate the media item is not downloaded.

Value: 0

Public methods

containsKey

fun containsKey(@NonNull key: String): Boolean

Returns true if the given key is contained in the metadata

Parameters
key String: a String key
Return
Boolean true if the key exists in this metadata, false otherwise

getBitmap

@Nullable fun getBitmap(@NonNull key: String): Bitmap?

Return a Bitmap for the given key or null if no bitmap exists for the given key.

Parameters
key String: The key the value is stored under
Return
Bitmap? A Bitmap or null

getExtras

@Nullable fun getExtras(): Bundle?

Get the extra Bundle from the metadata object.

Return
Bundle? A Bundle or null

getFloat

fun getFloat(@NonNull key: String): Float

Return the value associated with the given key, or 0.0f if no long exists for the given key.

Parameters
key String: The key the value is stored under
Return
Float a float value

getLong

fun getLong(@NonNull key: String): Long

Returns the value associated with the given key, or 0L if no long exists for the given key.

Parameters
key String: The key the value is stored under
Return
Long a long value

getMediaId

@Nullable fun getMediaId(): String?

Returns the media id, or null if the id doesn't exist.

This is equivalent to the getString(String) with the METADATA_KEY_MEDIA_ID.

Return
String? media id. Can be null

getRating

@Nullable fun getRating(@NonNull key: String): Rating?

Return a Rating for the given key or null if no rating exists for the given key.

For the METADATA_KEY_USER_RATING, A null return value means that user rating cannot be set by androidx.media2.session.MediaController.

Parameters
key String: The key the value is stored under
Return
Rating? A Rating or null

getString

@Nullable fun getString(@NonNull key: String): String?

Returns the value associated with the given key, or null if no mapping of the desired type exists for the given key or a null value is explicitly associated with the key.

Parameters
key String: The key the value is stored under
Return
String? a String value, or null

getText

@Nullable fun getText(@NonNull key: String): CharSequence?

Returns the value associated with the given key, or null if no mapping of the desired type exists for the given key or a null value is explicitly associated with the key.

Parameters
key String: The key the value is stored under
Return
CharSequence? a CharSequence value, or null

keySet

@NonNull fun keySet(): MutableSet<String!>

Returns a Set containing the Strings used as keys in this metadata.

Return
MutableSet<String!> a Set of String keys

size

fun size(): Int

Get the number of fields in this metadata.

Return
Int The number of fields in the metadata.

toString

fun toString(): String