CarAudioManager.CarVolumeCallback

public static abstract class CarAudioManager.CarVolumeCallback
extends Object

java.lang.Object
↳	android.car.media.CarAudioManager.CarVolumeCallback

Callback interface to receive volume change events in a car. Extend this class and register it with CarAudioManager.registerCarVolumeCallback(android.car.media.CarAudioManager.CarVolumeCallback) and unregister it via CarAudioManager.unregisterCarVolumeCallback(android.car.media.CarAudioManager.CarVolumeCallback)

Summary

Public constructors
`CarVolumeCallback()`

Public methods
`void`	`onGroupMuteChanged(int zoneId, int groupId, int flags)` This is called whenever a group mute state is changed.
`void`	`onGroupVolumeChanged(int zoneId, int groupId, int flags)` This is called whenever a group volume is changed.
`void`	`onMasterMuteChanged(int zoneId, int flags)` This is called whenever the global mute state is changed.

Inherited methods

From class


        
          java.lang.Object

`Object`	`clone()`
`boolean`	`equals(Object arg0)`
`void`	`finalize()`
`final Class<?>`	`getClass()`
`int`	`hashCode()`
`final void`	`notify()`
`final void`	`notifyAll()`
`String`	`toString()`
`final void`	`wait(long arg0, int arg1)`
`final void`	`wait(long arg0)`
`final void`	`wait()`

Public constructors

CarVolumeCallback

public CarVolumeCallback ()

Public methods

onGroupMuteChanged

Added in API level 31

public void onGroupMuteChanged (int zoneId, 
                int groupId, 
                int flags)

This is called whenever a group mute state is changed. The changed-to mute state is not included, the caller is encouraged to get the current group mute state via CarAudioManager.

Notes:

If CarAudioManager#AUDIO_FEATURE_VOLUME_GROUP_MUTING is enabled this will be triggered on mute changes. Otherwise, car audio mute changes will trigger onMasterMuteChanged(int, int)
If both CarVolumeCallback and CarVolumeGroupEventCallback are registered by the same app, then volume group mute changes are only propagated through CarVolumeGroupEventCallback (until it is unregistered)
Apps are encouraged to migrate to the new callback CarVolumeGroupEventCallback

Parameters
`zoneId`	`int`: Id of the audio zone that volume change happens
`groupId`	`int`: Id of the volume group that volume is changed
`flags`	`int`: see `AudioManager` for flag definitions

onGroupVolumeChanged

Added in API level 29

public void onGroupVolumeChanged (int zoneId, 
                int groupId, 
                int flags)

This is called whenever a group volume is changed. The changed-to volume index is not included, the caller is encouraged to get the current group volume index via CarAudioManager.

Notes:

If both CarVolumeCallback and CarVolumeGroupEventCallback are registered by the same app, then volume group index changes are only propagated through CarVolumeGroupEventCallback (until it is unregistered)
Apps are encouraged to migrate to the new callback CarVolumeGroupEventCallback

Parameters
`zoneId`	`int`: Id of the audio zone that volume change happens
`groupId`	`int`: Id of the volume group that volume is changed
`flags`	`int`: see `AudioManager` for flag definitions

onMasterMuteChanged

Added in API level 29

public void onMasterMuteChanged (int zoneId, 
                int flags)

This is called whenever the global mute state is changed. The changed-to global mute state is not included, the caller is encouraged to get the current global mute state via AudioManager.

Note: If CarAudioManager#AUDIO_FEATURE_VOLUME_GROUP_MUTING is disabled this will be triggered on mute changes. Otherwise, car audio mute changes will trigger onGroupMuteChanged(int, int, int)

Parameters

zoneId int: Id of the audio zone that global mute state change happens

flags int: see AudioManager for flag definitions

Parameters
`zoneId`	`int`: Id of the audio zone that global mute state change happens
`flags`	`int`: see `AudioManager` for flag definitions