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AudioAttributesCompat

public class AudioAttributesCompat implements VersionedParcelable

A class to encapsulate a collection of attributes describing information about an audio stream.

AudioAttributesCompat supersede the notion of stream types (see for instance STREAM_MUSIC or STREAM_ALARM) for defining the behavior of audio playback. Attributes allow an application to specify more information than is conveyed in a stream type by allowing the application to define:

  • usage: "why" you are playing a sound, what is this sound used for. This is achieved with the "usage" information. Examples of usage are USAGE_MEDIA and USAGE_ALARM. These two examples are the closest to stream types, but more detailed use cases are available. Usage information is more expressive than a stream type, and allows certain platforms or routing policies to use this information for more refined volume or routing decisions. Usage is the most important information to supply in AudioAttributesCompat and it is recommended to build any instance with this information supplied, see AudioAttributesCompat.Builder for exceptions.
  • content type: "what" you are playing. The content type expresses the general category of the content. This information is optional. But in case it is known (for instance CONTENT_TYPE_MOVIE for a movie streaming service or CONTENT_TYPE_MUSIC for a music playback application) this information might be used by the audio framework to selectively configure some audio post-processing blocks.
  • flags: "how" is playback to be affected, see the flag definitions for the specific playback behaviors they control.

AudioAttributesCompat instance is built through its builder, AudioAttributesCompat.Builder. Also see android.media.AudioAttributes for the framework implementation of this class.

Summary

Nested types

Builder class for AudioAttributesCompat objects.

Constants
static final int

Content type value to use when the content type is a soundtrack, typically accompanying a movie or TV program.
static final int

Content type value to use when the content type is music.
static final int

Content type value to use when the content type is a sound used to accompany a user action, such as a beep or sound effect expressing a key click, or event, such as the type of a sound for a bonus being received in a game.
static final int

Content type value to use when the content type is speech.
static final int

Content type value to use when the content type is unknown, or other than the ones defined.
static final int

Flag defining a behavior where the audibility of the sound will be ensured by the system.
static final int

Flag requesting the use of an output stream supporting hardware A/V synchronization.
static final int

Usage value to use when the usage is an alarm (e.g. wake-up alarm).
static final int

Usage value to use when the usage is for accessibility, such as with a screen reader.
static final int

Usage value to use when the usage is driving or navigation directions.
static final int

Usage value to use when the usage is sonification, such as with user interface sounds.
static final int

Usage value to use for audio responses to user queries, audio instructions or help utterances.
static final int

Usage value to use when the usage is for game audio.
static final int

Usage value to use when the usage is media, such as music, or movie soundtracks.
static final int

Usage value to use when the usage is notification.
static final int

Usage value to use when the usage is notification for a non-immediate type of communication such as e-mail.
static final int

Usage value to use when the usage is notification for an "instant" communication such as a chat, or SMS.
static final int

Usage value to use when the usage is a request to enter/end a communication, such as a VoIP communication or video-conference.
static final int

Usage value to use when the usage is to attract the user's attention, such as a reminder or low battery warning.
static final int

Usage value to use when the usage is telephony ringtone.
static final int

Usage value to use when the usage is unknown.
static final int

Usage value to use when the usage is voice communications, such as telephony or VoIP.
static final int

Usage value to use when the usage is in-call signalling, such as with a "busy" beep, or DTMF tones.

Public methods
boolean
int

Returns the content type.
int

Returns the flags.
int

Returns a stream type passed to setLegacyStreamType, or best guessing from flags and usage, or -1 if there is no converting logic in framework side (API 21+).
int

Returns the usage.
int

Returns the stream type matching the given attributes for volume control.
int
String
@Nullable Object

If the current SDK level is 21 or higher, return the AudioAttributes object inside this AudioAttributesCompat.
static @Nullable AudioAttributesCompat

Creates an AudioAttributesCompat given an API 21 AudioAttributes object.

Constants

CONTENT_TYPE_MOVIE

Added in 1.1.0
public static final int CONTENT_TYPE_MOVIE = 3

Content type value to use when the content type is a soundtrack, typically accompanying a movie or TV program.

CONTENT_TYPE_MUSIC

Added in 1.1.0
public static final int CONTENT_TYPE_MUSIC = 2

Content type value to use when the content type is music.

CONTENT_TYPE_SONIFICATION

Added in 1.1.0
public static final int CONTENT_TYPE_SONIFICATION = 4

Content type value to use when the content type is a sound used to accompany a user action, such as a beep or sound effect expressing a key click, or event, such as the type of a sound for a bonus being received in a game. These sounds are mostly synthesized or short Foley sounds.

CONTENT_TYPE_SPEECH

Added in 1.1.0
public static final int CONTENT_TYPE_SPEECH = 1

Content type value to use when the content type is speech.

CONTENT_TYPE_UNKNOWN

Added in 1.1.0
public static final int CONTENT_TYPE_UNKNOWN = 0

Content type value to use when the content type is unknown, or other than the ones defined.

FLAG_AUDIBILITY_ENFORCED

Added in 1.1.0
public static final int FLAG_AUDIBILITY_ENFORCED = 1

Flag defining a behavior where the audibility of the sound will be ensured by the system.

FLAG_HW_AV_SYNC

Added in 1.1.0
public static final int FLAG_HW_AV_SYNC = 16

Flag requesting the use of an output stream supporting hardware A/V synchronization.

USAGE_ALARM

Added in 1.1.0
public static final int USAGE_ALARM = 4

Usage value to use when the usage is an alarm (e.g. wake-up alarm).

USAGE_ASSISTANCE_ACCESSIBILITY

Added in 1.1.0
public static final int USAGE_ASSISTANCE_ACCESSIBILITY = 11

Usage value to use when the usage is for accessibility, such as with a screen reader.

USAGE_ASSISTANCE_NAVIGATION_GUIDANCE

Added in 1.1.0
public static final int USAGE_ASSISTANCE_NAVIGATION_GUIDANCE = 12

Usage value to use when the usage is driving or navigation directions.

USAGE_ASSISTANCE_SONIFICATION

Added in 1.1.0
public static final int USAGE_ASSISTANCE_SONIFICATION = 13

Usage value to use when the usage is sonification, such as with user interface sounds.

USAGE_ASSISTANT

Added in 1.1.0
public static final int USAGE_ASSISTANT = 16

Usage value to use for audio responses to user queries, audio instructions or help utterances.

USAGE_GAME

Added in 1.1.0
public static final int USAGE_GAME = 14

Usage value to use when the usage is for game audio.

USAGE_MEDIA

Added in 1.1.0
public static final int USAGE_MEDIA = 1

Usage value to use when the usage is media, such as music, or movie soundtracks.

USAGE_NOTIFICATION

Added in 1.1.0
public static final int USAGE_NOTIFICATION = 5

Usage value to use when the usage is notification. See other notification usages for more specialized uses.

USAGE_NOTIFICATION_COMMUNICATION_DELAYED

Added in 1.1.0
public static final int USAGE_NOTIFICATION_COMMUNICATION_DELAYED = 9

Usage value to use when the usage is notification for a non-immediate type of communication such as e-mail.

USAGE_NOTIFICATION_COMMUNICATION_INSTANT

Added in 1.1.0
public static final int USAGE_NOTIFICATION_COMMUNICATION_INSTANT = 8

Usage value to use when the usage is notification for an "instant" communication such as a chat, or SMS.

USAGE_NOTIFICATION_COMMUNICATION_REQUEST

Added in 1.1.0
public static final int USAGE_NOTIFICATION_COMMUNICATION_REQUEST = 7

Usage value to use when the usage is a request to enter/end a communication, such as a VoIP communication or video-conference.

USAGE_NOTIFICATION_EVENT

Added in 1.1.0
public static final int USAGE_NOTIFICATION_EVENT = 10

Usage value to use when the usage is to attract the user's attention, such as a reminder or low battery warning.

USAGE_NOTIFICATION_RINGTONE

Added in 1.1.0
public static final int USAGE_NOTIFICATION_RINGTONE = 6

Usage value to use when the usage is telephony ringtone.

USAGE_UNKNOWN

Added in 1.1.0
public static final int USAGE_UNKNOWN = 0

Usage value to use when the usage is unknown.

USAGE_VOICE_COMMUNICATION

Added in 1.1.0
public static final int USAGE_VOICE_COMMUNICATION = 2

Usage value to use when the usage is voice communications, such as telephony or VoIP.

USAGE_VOICE_COMMUNICATION_SIGNALLING

Added in 1.1.0
public static final int USAGE_VOICE_COMMUNICATION_SIGNALLING = 3

Usage value to use when the usage is in-call signalling, such as with a "busy" beep, or DTMF tones.

Public methods

equals

public boolean equals(Object o)

getContentType

Added in 1.1.0
public int getContentType()

Returns the content type.

Returns
int

one of the values that can be set in setContentType

getFlags

Added in 1.1.0
public int getFlags()

Returns the flags.

Returns
int

a combined mask of all flags

getLegacyStreamType

Added in 1.1.0
public int getLegacyStreamType()

Returns a stream type passed to setLegacyStreamType, or best guessing from flags and usage, or -1 if there is no converting logic in framework side (API 21+).

Returns
int

the stream type {@see AudioManager}

getUsage

Added in 1.1.0
public int getUsage()

Returns the usage.

Returns
int

one of the values that can be set in setUsage

getVolumeControlStream

Added in 1.1.0
public int getVolumeControlStream()

Returns the stream type matching the given attributes for volume control. Use this method to derive the stream type needed to configure the volume control slider in an android.app.Activity with setVolumeControlStream. Do not use this method to set the stream type on an audio player object (e.g. android.media.AudioTrack, android.media.MediaPlayer) as this is deprecated; use AudioAttributes instead.

Returns
int

a valid stream type for Activity or stream volume control that matches the attributes, or USE_DEFAULT_STREAM_TYPE if there isn't a direct match. Note that USE_DEFAULT_STREAM_TYPE is not a valid value for setStreamVolume.

hashCode

public int hashCode()

toString

public String toString()

unwrap

Added in 1.1.0
public @Nullable Object unwrap()

If the current SDK level is 21 or higher, return the AudioAttributes object inside this AudioAttributesCompat. Otherwise null.

Returns
@Nullable Object

the underlying AudioAttributes object or null

wrap

Added in 1.1.0
public static @Nullable AudioAttributesCompat wrap(@NonNull Object aa)

Creates an AudioAttributesCompat given an API 21 AudioAttributes object.

Parameters
@NonNull Object aa

an instance of AudioAttributes.
Returns
@Nullable AudioAttributesCompat

the new AudioAttributesCompat, or null on API <21
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