程序包 ohos.media.sessioncore

类 AVVolumeHandler

java.lang.Object

ohos.media.sessioncore.AVVolumeHandler

public abstract class AVVolumeHandler
extends Object

Provides methods to control volume.

从以下版本开始:

6

字段概要

字段

限定符和类型	字段	说明
static int	ADJUST_MODE_ALLOW_ALL	Indicates that both adjustment based on volume steps and direct volume setting are supported.
static int	ADJUST_MODE_ALLOW_SCROLL	Indicates that only adjustment based on volume steps is supported.
static int	ADJUST_MODE_FORBID_ALL	Indicates that volume adjustment is not allowed.

构造器概要

构造器

构造器	说明
AVVolumeHandler(int adjustMode, int maxVolume, int currentVolume)	A constructor used to create an AVVolumeHandler instance.

方法概要

限定符和类型	方法	说明
int	getVolume()	Obtains the current volume.
void	onScrollVolume(int direction)	Called after volume adjustment request is received.
void	onSetVolume(int volume)	Called after a volume setting request is received.
void	setVolume(int volume)	Notifies the system that the current volume has been changed.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

字段详细资料

ADJUST_MODE_ALLOW_ALL

public static final int ADJUST_MODE_ALLOW_ALL

Indicates that both adjustment based on volume steps and direct volume setting are supported.

从以下版本开始:

6

另请参阅:

常量字段值

ADJUST_MODE_ALLOW_SCROLL

public static final int ADJUST_MODE_ALLOW_SCROLL

Indicates that only adjustment based on volume steps is supported.

从以下版本开始:

6

另请参阅:

常量字段值

ADJUST_MODE_FORBID_ALL

public static final int ADJUST_MODE_FORBID_ALL

Indicates that volume adjustment is not allowed.

从以下版本开始:

6

另请参阅:

常量字段值

构造器详细资料

AVVolumeHandler

public AVVolumeHandler(int adjustMode,
                       int maxVolume,
                       int currentVolume)
                throws IllegalArgumentException

A constructor used to create an AVVolumeHandler instance.

参数:

adjustMode - Indicates the volume adjustment mode. The value can be ADJUST_MODE_FORBID_ALL, ADJUST_MODE_ALLOW_SCROLL, or ADJUST_MODE_ALLOW_ALL.

maxVolume - Indicates the maximum volume allowed.

currentVolume - Indicates the current volume, which must be lower than the maximum volume.

抛出:

IllegalArgumentException - Throws this exception if an input parameter is invalid.

从以下版本开始:

6

方法详细资料

getVolume

public final int getVolume()

Obtains the current volume.

返回:

Returns the current volume.

从以下版本开始:

6

setVolume

public final void setVolume(int volume)

Notifies the system that the current volume has been changed. You should call this method when overriding the onScrollVolume(int) or onSetVolume(int) method.

参数:

volume - Indicates the changed volume.

从以下版本开始:

6

onSetVolume

public void onSetVolume(int volume)

Called after a volume setting request is received.

Override this method to process the request and call setVolume(int) to notify the system after the request is processed.

参数:

volume - Indicates the volume to set.

从以下版本开始:

6

onScrollVolume

public void onScrollVolume(int direction)

Called after volume adjustment request is received.

Override this method to process the request and call setVolume(int) to notify the system after the request is processed.

参数:

direction - Indicates the volume adjustment direction, which can be AudioManager#VOLUME_OP_DEC, AudioManager#VOLUME_OP_MAINTAIN, or AudioManager#VOLUME_OP_INC.

从以下版本开始:

6