java.lang.Object
- com.epson.moverio.hardware.audio.AudioManager

```
public class AudioManager
extends java.lang.Object
```
This class controls the audio installed in the Moverio. Audio management acquires an instance of the AudioManager and performs a variety of management operations.

Since:

1.0.0

Field Summary

Fields
Modifier and Type	Field	Description
`static int`	`DEVICE_MODE_AUDIO_JACK`	Audio jack mode.
`static int`	`DEVICE_MODE_BUILTIN_AUDIO`	Builtin audio mode.
`static int`	`DEVICE_MODE_UNKNOWN`	Unknown device mode.
`static int`	`VOLUME_LIMIT_MODE_OFF`	Release volume limit.
`static int`	`VOLUME_LIMIT_MODE_ON`	Set volume limit.
`static int`	`VOLUME_LIMIT_MODE_UNKNOWN`	Unknown volume limit mode.

Constructor Summary

Constructors
Constructor	Description
`AudioManager(android.content.Context context)`	This is the AudioManager constructor.
`AudioManager(android.content.Context context, PermissionGrantResultCallback callback)`	This is the AudioManager constructor.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`close()`	Disconnect from the Moverio's audio.
`int`	`getDeviceMode()`	Acquire the device mode for the Moverio.
`int`	`getGainStep()`	Acquire the audio gain adjustment step for the Moverio.
`int`	`getGainStepMax()`	Gets the maximum audio gain adjustment step.
`int`	`getGainStepMin()`	Gets the minimum audio gain adjustment step.
`java.util.List<java.lang.Integer>`	`getSupportedDeviceMode()`	Gets the list of supported device mode.
`int`	`getVolume()`	Acquire the audio volume for the Moverio.
`int`	`getVolumeMax()`	Gets the maximum volume value.
`int`	`getVolumeMin()`	Gets the minimum volume value.
`boolean`	`isAudioManagerSupported()`	Check if the MOVERIO connected to the host device supports AudioManager functions.
`boolean`	`isGainStepControlSupported()`	Check if it supports controlling the audio gain adjustment step.
`boolean`	`isVolumeControlSupported()`	Check if it supports controlling the volume.
`boolean`	`isVolumeLimitModeControlSupported()`	Check if it supports controlling the volume limit mode.
`void`	`open()`	Connect to the Moverio's audio.
`void`	`release()`	Release resources for using Moverio audio.
`int`	`setDeviceMode(int mode)`	Set the device mode.
`int`	`setGainStep(int step)`	Set the audio gain adjustment step.
`int`	`setVolume(int volume)`	Set the audio volume for the Moverio.
`int`	`setVolumeLimitMode(int mode)`	Set the volume limit mode for the Moverio.

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - VOLUME_LIMIT_MODE_ON
```
public static final int VOLUME_LIMIT_MODE_ON
```
    Set volume limit.
    
    Since:
    
    1.0.0
    
    See Also:
    
    Constant Field Values
  - VOLUME_LIMIT_MODE_OFF
```
public static final int VOLUME_LIMIT_MODE_OFF
```
    Release volume limit.
    
    Since:
    
    1.0.0
    
    See Also:
    
    Constant Field Values
  - VOLUME_LIMIT_MODE_UNKNOWN
```
public static final int VOLUME_LIMIT_MODE_UNKNOWN
```
    Unknown volume limit mode.
    
    Since:
    
    1.0.0
    
    See Also:
    
    Constant Field Values
  - DEVICE_MODE_BUILTIN_AUDIO
```
public static final int DEVICE_MODE_BUILTIN_AUDIO
```
    Builtin audio mode.
    
    Since:
    
    1.2.0
    
    See Also:
    
    Constant Field Values
  - DEVICE_MODE_AUDIO_JACK
```
public static final int DEVICE_MODE_AUDIO_JACK
```
    Audio jack mode.
    
    Since:
    
    1.2.0
    
    See Also:
    
    Constant Field Values
  - DEVICE_MODE_UNKNOWN
```
public static final int DEVICE_MODE_UNKNOWN
```
    Unknown device mode.
    
    Since:
    
    1.2.0
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - AudioManager
```
public AudioManager(android.content.Context context)
```
    This is the AudioManager constructor.
    
    Parameters:
    
    context - Activity context
    
    Since:
    
    1.0.0
  - AudioManager
```
public AudioManager(android.content.Context context,
                    PermissionGrantResultCallback callback)
```
    This is the AudioManager constructor.
    
    Parameters:
    
    context - Activity context
    
    callback - Callback of permission grant result
    
    Since:
    
    1.2.0
- Method Detail
  - open
```
public void open()
          throws java.io.IOException
```
    Connect to the Moverio's audio. It is possible to perform a variety of operations by connecting to the Moverio's audio.
    
    Throws:
    
    java.io.IOException - Exceptions such as no connections to Moverios
    
    Since:
    
    1.0.0
  - close
```
public void close()
```
    Disconnect from the Moverio's audio.
    
    Since:
    
    1.0.0
  - setVolume
```
public int setVolume(int volume)
```
    Set the audio volume for the Moverio. Returns 0 when setting the volume is successful and -1 when it fails. If isVolumeControlSupported of AudioManager returns false, -1 is returned.
    
    Parameters:
    
    volume - Audio volume
    
    Returns:
    
    0: success, -1: fail
    
    Since:
    
    1.0.0
  - getVolume
```
public int getVolume()
```
    Acquire the audio volume for the Moverio. Returns the volume value when acquiring the volume is successful and -1 when it fails. If isVolumeControlSupported of AudioManager returns false, -1 is returned.
    
    Returns:
    
    0 to 15 for BT-35E, 0 to 20 for BT-30C (at VOLUME_LIMIT_MODE_ON), 0 to 33 for BT-30C (at VOLUME_LIMIT_MODE_OFF): success, -1: fail
    
    Since:
    
    1.0.0
  - getVolumeMin
```
public int getVolumeMin()
```
    Gets the minimum volume value. If isVolumeControlSupported of AudioManager returns false, -1 is returned.
    
    Returns:
    
    Minimum volume value
    
    Since:
    
    1.0.0
  - getVolumeMax
```
public int getVolumeMax()
```
    Gets the maximum volume value. If isVolumeControlSupported of AudioManager returns false, -1 is returned.
    
    Returns:
    
    Maximum volume value
    
    Since:
    
    1.0.0
  - isVolumeControlSupported
```
public boolean isVolumeControlSupported()
```
    Check if it supports controlling the volume. Returns supports controlling the volume when acquiring true is supported and false when it is not supported. Returns false even if MOVERIO is not connected to the host device.
    
    Returns:
    
    true: success, false: fail
    
    Since:
    
    1.1.0
  - setVolumeLimitMode
```
public int setVolumeLimitMode(int mode)
```
    Set the volume limit mode for the Moverio. Returns 0 when setting the volume limit is successful and -1 when it fails.
    
    Parameters:
    
    mode - volume limit mode
    
    Returns:
    
    0: success, -1: fail
    
    Since:
    
    1.0.0
  - isVolumeLimitModeControlSupported
```
public boolean isVolumeLimitModeControlSupported()
```
    Check if it supports controlling the volume limit mode. Returns supports controlling the volume limit mode when acquiring true is supported and false when it is not supported. Returns false even if MOVERIO is not connected to the host device.
    
    Returns:
    
    true: success, false: fail
    
    Since:
    
    1.1.0
  - setGainStep
```
public int setGainStep(int step)
```
    Set the audio gain adjustment step. Returns 0 when setting the step is successful and -1 when it fails. If isGainStepControlSupported of AudioManager returns false, -1 is returned. In order to use this API, need to declare custom permissions in AndroidManifest. For custom permissions, need to define a permission that combines the applicationID set in the application's build.gradle with ".permission.audio_gain". Example: If the applicationId is "com.example.app", the permission will be "com.example.app.permission.audio_gain".
    
    Parameters:
    
    step - adjustment step
    
    Returns:
    
    0: success, -1: fail
    
    Since:
    
    1.2.0
    
    See Also:
    
    isGainStepControlSupported()
  - getGainStep
```
public int getGainStep()
```
    Acquire the audio gain adjustment step for the Moverio. Returns the volume value when acquiring the step is successful and -1 when it fails. If isGainStepControlSupported of AudioManager returns false, -1 is returned.
    
    Returns:
    
    0 to 4: success, -1: fail
    
    Since:
    
    1.2.0
    
    See Also:
    
    isGainStepControlSupported()
  - getGainStepMin
```
public int getGainStepMin()
```
    Gets the minimum audio gain adjustment step. If isGainStepControlSupported of AudioManager returns false, -1 is returned.
    
    Returns:
    
    Minimum audio gain adjustment step
    
    Since:
    
    1.2.0
    
    See Also:
    
    isGainStepControlSupported()
  - getGainStepMax
```
public int getGainStepMax()
```
    Gets the maximum audio gain adjustment step. If isVolumeControlSupported of AudioManager returns false, -1 is returned.
    
    Returns:
    
    Maximum audio gain adjustment step
    
    Since:
    
    1.2.0
    
    See Also:
    
    isGainStepControlSupported()
  - isGainStepControlSupported
```
public boolean isGainStepControlSupported()
```
    Check if it supports controlling the audio gain adjustment step. Returns supports controlling the step when acquiring true is supported and false when it is not supported. Returns false even if MOVERIO is not connected to the host device.
    
    Returns:
    
    true: success, false: fail
    
    Since:
    
    1.2.0
  - setDeviceMode
```
public int setDeviceMode(int mode)
```
    Set the device mode. Returns 0 when setting the device mode is successful and -1 when it fails. The argument can be a mode retrieved from AudioManager#getSupportedDeviceMode. If change the device mode, the USB communication will be automatically close. In this case, connection with the device will be necessary again.
    
    Parameters:
    
    mode - Device mode
    
    Returns:
    
    0: success, -1: fail
    
    Since:
    
    1.2.0
    
    See Also:
    
    getSupportedDeviceMode()
  - getDeviceMode
```
public int getDeviceMode()
```
    Acquire the device mode for the Moverio. Returns the device mode value when acquiring the step is successful and -1 when it fails.
    
    Returns:
    
    Device mode
    
    Since:
    
    1.2.0
  - getSupportedDeviceMode
```
public java.util.List<java.lang.Integer> getSupportedDeviceMode()
```
    Gets the list of supported device mode.
    
    Returns:
    
    The list of supported device mode
    
    Since:
    
    1.2.0
  - release
```
public void release()
```
    Release resources for using Moverio audio. If you finish using audio, you must execute AudioManager#release.
    
    Since:
    
    1.0.2
  - isAudioManagerSupported
```
public boolean isAudioManagerSupported()
```
    Check if the MOVERIO connected to the host device supports AudioManager functions. Returns supports AudioManager when acquiring true is supported and false when it is not supported. Returns false even if MOVERIO is not connected to the host device.
    
    Returns:
    
    true: success, false: fail
    
    Since:
    
    1.1.0

Class AudioManager

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

VOLUME_LIMIT_MODE_ON

VOLUME_LIMIT_MODE_OFF

VOLUME_LIMIT_MODE_UNKNOWN

DEVICE_MODE_BUILTIN_AUDIO

DEVICE_MODE_AUDIO_JACK

DEVICE_MODE_UNKNOWN

Constructor Detail

AudioManager

AudioManager

Method Detail

open

close

setVolume

getVolume

getVolumeMin

getVolumeMax

isVolumeControlSupported

setVolumeLimitMode

isVolumeLimitModeControlSupported

setGainStep

getGainStep

getGainStepMin

getGainStepMax

isGainStepControlSupported

setDeviceMode

getDeviceMode

getSupportedDeviceMode

release

isAudioManagerSupported