AudioFocusRequest
public
final
class
AudioFocusRequest
extends Object
java.lang.Object | |
↳ | android.media.AudioFocusRequest |
A class to encapsulate information about an audio focus request.
An AudioFocusRequest
instance is built by Builder
, and is used to
request and abandon audio focus, respectively
with AudioManager#requestAudioFocus(AudioFocusRequest)
and
AudioManager#abandonAudioFocusRequest(AudioFocusRequest)
.
What is audio focus?
Audio focus is a concept introduced in API 8. It is used to convey the fact that a user can only focus on a single audio stream at a time, e.g. listening to music or a podcast, but not both at the same time. In some cases, multiple audio streams can be playing at the same time, but there is only one the user would really listen to (focus on), while the other plays in the background. An example of this is driving directions being spoken while music plays at a reduced volume (a.k.a. ducking).
When an application requests audio focus, it expresses its intention to "own" audio focus to play audio. Let's review the different types of focus requests, the return value after a request, and the responses to a loss.
Note: applications should not play anything until granted focus.
The different types of focus requests
There are four focus request types. A successful focus request with each will yield different behaviors by the system and the other application that previously held audio focus.
AudioManager#AUDIOFOCUS_GAIN
expresses the fact that your application is now the sole source of audio that the user is listening to. The duration of the audio playback is unknown, and is possibly very long: after the user finishes interacting with your application, (s)he doesn't expect another audio stream to resume. Examples of uses of this focus gain are for music playback, for a game or a video player.AudioManager#AUDIOFOCUS_GAIN_TRANSIENT
is for a situation when you know your application is temporarily grabbing focus from the current owner, but the user expects playback to go back to where it was once your application no longer requires audio focus. An example is for playing an alarm, or during a VoIP call. The playback is known to be finite: the alarm will time-out or be dismissed, the VoIP call has a beginning and an end. When any of those events ends, and if the user was listening to music when it started, the user expects music to resume, but didn't wish to listen to both at the same time.AudioManager#AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK
: this focus request type is similar toAUDIOFOCUS_GAIN_TRANSIENT
for the temporary aspect of the focus request, but it also expresses the fact during the time you own focus, you allow another application to keep playing at a reduced volume, "ducked". Examples are when playing driving directions or notifications, it's ok for music to keep playing, but not loud enough that it would prevent the directions to be hard to understand. A typical attenuation by the "ducked" application is a factor of 0.2f (or -14dB), that can for instance be applied withMediaPlayer.setVolume(0.2f)
when using this class for playback.AudioManager#AUDIOFOCUS_GAIN_TRANSIENT_EXCLUSIVE
is also for a temporary request, but also expresses that your application expects the device to not play anything else. This is typically used if you are doing audio recording or speech recognition, and don't want for examples notifications to be played by the system during that time.
An AudioFocusRequest
instance always contains one of the four types of requests
explained above. It is passed when building an AudioFocusRequest
instance with its
builder in the Builder
constructor
AudioFocusRequest.Builder#Builder(int)
, or
with AudioFocusRequest.Builder#setFocusGain(int)
after copying an existing instance with
AudioFocusRequest.Builder#Builder(AudioFocusRequest)
.
Qualifying your focus request
Use case requiring a focus request
Any focus request is qualified by the AudioAttributes
(see Builder#setAudioAttributes(AudioAttributes)
) that describe the audio use case that
will follow the request (once it's successful or granted). It is recommended to use the
same AudioAttributes
for the request as the attributes you are using for audio/media
playback.
If no attributes are set, default attributes of AudioAttributes#USAGE_MEDIA
are used.
Delayed focus
Audio focus can be "locked" by the system for a number of reasons: during a phone call, when
the car to which the device is connected plays an emergency message... To support these
situations, the application can request to be notified when its request is fulfilled, by flagging
its request as accepting delayed focus, with Builder#setAcceptsDelayedFocusGain(boolean)
.
If focus is requested while being locked by the system,
AudioManager#requestAudioFocus(AudioFocusRequest)
will return
AudioManager#AUDIOFOCUS_REQUEST_DELAYED
. When focus isn't locked anymore, the focus
listener set with Builder#setOnAudioFocusChangeListener(OnAudioFocusChangeListener)
or with Builder#setOnAudioFocusChangeListener(OnAudioFocusChangeListener, Handler)
will
be called to notify the application it now owns audio focus.
Pausing vs ducking
When an application requested audio focus with
AudioManager#AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK
, the system will duck the current focus
owner.
Note: this behavior is new for Android O, whereas applications targeting
SDK level up to API 25 had to implement the ducking themselves when they received a focus
loss of AudioManager#AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK
.
But ducking is not always the behavior expected by the user. A typical example is when the
device plays driving directions while the user is listening to an audio book or podcast, and
expects the audio playback to pause, instead of duck, as it is hard to understand a navigation
prompt and spoken content at the same time. Therefore the system will not automatically duck
when it detects it would be ducking spoken content: such content is detected when the
AudioAttributes
of the player are qualified by
AudioAttributes#CONTENT_TYPE_SPEECH
. Refer for instance to
AudioAttributes.Builder#setContentType(int)
and
MediaPlayer#setAudioAttributes(AudioAttributes)
if you are writing a media playback
application for audio book, podcasts... Since the system will not automatically duck applications
that play speech, it calls their focus listener instead to notify them of
AudioManager#AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK
, so they can pause instead. Note that
this behavior is independent of the use of AudioFocusRequest
, but tied to the use
of AudioAttributes
.
If your application requires pausing instead of ducking for any other reason than playing
speech, you can also declare so with Builder#setWillPauseWhenDucked(boolean)
, which will
cause the system to call your focus listener instead of automatically ducking.
Example
The example below covers the following steps to be found in any application that would play audio, and use audio focus. Here we play an audio book, and our application is intended to pause rather than duck when it loses focus. These steps consist in:
- Creating
AudioAttributes
to be used for the playback and the focus request. - Configuring and creating the
AudioFocusRequest
instance that defines the intended focus behaviors. - Requesting audio focus and checking the return code to see if playback can happen right away, or is delayed.
- Implementing a focus change listener to respond to focus gains and losses.
// initialization of the audio attributes and focus request mAudioManager = (AudioManager) Context.getSystemService(Context.AUDIO_SERVICE); mPlaybackAttributes = new AudioAttributes.Builder() .setUsage(AudioAttributes.USAGE_MEDIA) .setContentType(AudioAttributes.CONTENT_TYPE_SPEECH) .build(); mFocusRequest = new AudioFocusRequest.Builder(AudioManager.AUDIOFOCUS_GAIN) .setAudioAttributes(mPlaybackAttributes) .setAcceptsDelayedFocusGain(true) .setWillPauseWhenDucked(true) .setOnAudioFocusChangeListener(this, mMyHandler) .build(); mMediaPlayer = new MediaPlayer(); mMediaPlayer.setAudioAttributes(mPlaybackAttributes); final Object mFocusLock = new Object(); boolean mPlaybackDelayed = false; // requesting audio focus int res = mAudioManager.requestAudioFocus(mFocusRequest); synchronized (mFocusLock) { if (res == AudioManager.AUDIOFOCUS_REQUEST_FAILED) { mPlaybackDelayed = false; } else if (res == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) { mPlaybackDelayed = false; playbackNow(); } else if (res == AudioManager.AUDIOFOCUS_REQUEST_DELAYED) { mPlaybackDelayed = true; } } // implementation of the OnAudioFocusChangeListener @Override public void onAudioFocusChange(int focusChange) { switch (focusChange) { case AudioManager.AUDIOFOCUS_GAIN: if (mPlaybackDelayed || mResumeOnFocusGain) { synchronized (mFocusLock) { mPlaybackDelayed = false; mResumeOnFocusGain = false; } playbackNow(); } break; case AudioManager.AUDIOFOCUS_LOSS: synchronized (mFocusLock) { // this is not a transient loss, we shouldn't automatically resume for now mResumeOnFocusGain = false; mPlaybackDelayed = false; } pausePlayback(); break; case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT: case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK: // we handle all transient losses the same way because we never duck audio books synchronized (mFocusLock) { // we should only resume if playback was interrupted mResumeOnFocusGain = mMediaPlayer.isPlaying(); mPlaybackDelayed = false; } pausePlayback(); break; } } // Important: // Also set "mResumeOnFocusGain" to false when the user pauses or stops playback: this way your // application doesn't automatically restart when it gains focus, even though the user had // stopped it.
Summary
Nested classes | |
---|---|
class |
AudioFocusRequest.Builder
Builder class for |
Public methods | |
---|---|
boolean
|
acceptsDelayedFocusGain()
Returns whether the application that would use this |
AudioAttributes
|
getAudioAttributes()
Returns the |
int
|
getFocusGain()
Returns the type of audio focus request configured for this |
boolean
|
willPauseWhenDucked()
Returns whether the application that would use this |
Inherited methods | |
---|---|
Public methods
acceptsDelayedFocusGain
public boolean acceptsDelayedFocusGain ()
Returns whether the application that would use this AudioFocusRequest
supports
a focus gain granted after a temporary request failure.
Returns | |
---|---|
boolean |
whether delayed focus gain is supported. |
getAudioAttributes
public AudioAttributes getAudioAttributes ()
Returns the AudioAttributes
set for this AudioFocusRequest
, or the default
attributes if none were set.
Returns | |
---|---|
AudioAttributes |
non-null AudioAttributes . |
getFocusGain
public int getFocusGain ()
Returns the type of audio focus request configured for this AudioFocusRequest
.
Returns | |
---|---|
int |
one of AudioManager#AUDIOFOCUS_GAIN ,
AudioManager#AUDIOFOCUS_GAIN_TRANSIENT ,
AudioManager#AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK , and
AudioManager#AUDIOFOCUS_GAIN_TRANSIENT_EXCLUSIVE . |
willPauseWhenDucked
public boolean willPauseWhenDucked ()
Returns whether the application that would use this AudioFocusRequest
would pause
when it is requested to duck.
Returns | |
---|---|
boolean |
the duck/pause behavior. |
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Last updated 2024-04-04 UTC.