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Summary: Constants | Ctors | Methods | Inherited Methods

VolumeProvider

public abstract class VolumeProvider
extends Object

java.lang.Object
↳	android.media.VolumeProvider

Handles requests to adjust or set the volume on a session. This is also used to push volume updates back to the session. The provider must call setCurrentVolume(int) each time the volume being provided changes.

You can set a volume provider on a session by calling MediaSession#setPlaybackToRemote.

Summary

Constants
`int`	`VOLUME_CONTROL_ABSOLUTE` The volume control uses an absolute value.
`int`	`VOLUME_CONTROL_FIXED` The volume is fixed and can not be modified.
`int`	`VOLUME_CONTROL_RELATIVE` The volume control uses relative adjustment via `onAdjustVolume(int)`.

Public constructors
`VolumeProvider(int volumeControl, int maxVolume, int currentVolume)` Create a new volume provider for handling volume events.
`VolumeProvider(int volumeControl, int maxVolume, int currentVolume, String volumeControlId)` Create a new volume provider for handling volume events.

Public methods
`final int`	`getCurrentVolume()` Gets the current volume.
`final int`	`getMaxVolume()` Get the maximum volume this provider allows.
`final int`	`getVolumeControl()` Get the volume control type that this volume provider uses.
`final String`	`getVolumeControlId()` Gets the volume control ID.
`void`	`onAdjustVolume(int direction)` Override to handle requests to adjust the volume of the current output.
`void`	`onSetVolumeTo(int volume)` Override to handle requests to set the volume of the current output.
`final void`	`setCurrentVolume(int currentVolume)` Notify the system that the current volume has been changed.

Inherited methods

From class


        
          java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void`	`wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void`	`wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

Constants

VOLUME_CONTROL_ABSOLUTE

public static final int VOLUME_CONTROL_ABSOLUTE

The volume control uses an absolute value. It may be adjusted using onAdjustVolume(int) or set directly using onSetVolumeTo(int).

Constant Value: 2 (0x00000002)

VOLUME_CONTROL_FIXED

public static final int VOLUME_CONTROL_FIXED

The volume is fixed and can not be modified. Requests to change volume should be ignored.

Constant Value: 0 (0x00000000)

VOLUME_CONTROL_RELATIVE

public static final int VOLUME_CONTROL_RELATIVE

The volume control uses relative adjustment via onAdjustVolume(int). Attempts to set the volume to a specific value should be ignored.

Constant Value: 1 (0x00000001)

Public constructors

VolumeProvider

public VolumeProvider (int volumeControl, 
                int maxVolume, 
                int currentVolume)

Create a new volume provider for handling volume events. You must specify the type of volume control, the maximum volume that can be used, and the current volume on the output.

Parameters
`volumeControl`	`int`: The method for controlling volume that is used by this provider. Value is `VOLUME_CONTROL_FIXED`, `VOLUME_CONTROL_RELATIVE`, or `VOLUME_CONTROL_ABSOLUTE`
`maxVolume`	`int`: The maximum allowed volume.
`currentVolume`	`int`: The current volume on the output.

VolumeProvider

public VolumeProvider (int volumeControl, 
                int maxVolume, 
                int currentVolume, 
                String volumeControlId)

Create a new volume provider for handling volume events. You must specify the type of volume control, the maximum volume that can be used, and the current volume on the output.

Parameters
`volumeControl`	`int`: The method for controlling volume that is used by this provider. Value is `VOLUME_CONTROL_FIXED`, `VOLUME_CONTROL_RELATIVE`, or `VOLUME_CONTROL_ABSOLUTE`
`maxVolume`	`int`: The maximum allowed volume.
`currentVolume`	`int`: The current volume on the output.
`volumeControlId`	`String`: The volume control ID of this provider. This value may be `null`.

Public methods

getCurrentVolume

public final int getCurrentVolume ()

Gets the current volume. This will be the last value set by setCurrentVolume(int).

Returns
`int`	The current volume.

getMaxVolume

public final int getMaxVolume ()

Get the maximum volume this provider allows.

Returns
`int`	The max allowed volume.

getVolumeControl

public final int getVolumeControl ()

Get the volume control type that this volume provider uses.

Returns
`int`	The volume control type for this volume provider Value is `VOLUME_CONTROL_FIXED`, `VOLUME_CONTROL_RELATIVE`, or `VOLUME_CONTROL_ABSOLUTE`

getVolumeControlId

public final String getVolumeControlId ()

Gets the volume control ID. It can be used to identify which volume provider is used by the session.

Returns
`String`	the volume control ID or `null` if it isn't set.

onAdjustVolume

public void onAdjustVolume (int direction)

Override to handle requests to adjust the volume of the current output. Direction will be one of AudioManager#ADJUST_LOWER, AudioManager#ADJUST_RAISE, AudioManager#ADJUST_SAME. After the volume has been modified setCurrentVolume(int) must be called to notify the system.

Parameters
`direction`	`int`: The direction to change the volume in.

onSetVolumeTo

public void onSetVolumeTo (int volume)

Override to handle requests to set the volume of the current output. After the volume has been modified setCurrentVolume(int) must be called to notify the system.

Parameters
`volume`	`int`: The volume to set the output to.

setCurrentVolume

public final void setCurrentVolume (int currentVolume)

Notify the system that the current volume has been changed. This must be called every time the volume changes to ensure it is displayed properly.

Parameters
`currentVolume`	`int`: The current volume on the output.

Annotations

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Exceptions

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VolumeProvider

Summary

Constants

Public constructors

Public methods

Inherited methods

Constants

VOLUME_CONTROL_ABSOLUTE

VOLUME_CONTROL_FIXED

VOLUME_CONTROL_RELATIVE

Public constructors

VolumeProvider

VolumeProvider

Public methods

getCurrentVolume

getMaxVolume

getVolumeControl

getVolumeControlId

onAdjustVolume

onSetVolumeTo

setCurrentVolume