Added in API level 11

Summary: Constants | Inherited Constants | Methods | Inherited Methods

BluetoothHeadset

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Kotlin |Java

public final class BluetoothHeadset
extends Object implements BluetoothProfile

java.lang.Object
↳	android.bluetooth.BluetoothHeadset

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Public API for controlling the Bluetooth Headset Service. This includes both Bluetooth Headset and Handsfree (v1.5) profiles.

BluetoothHeadset is a proxy object for controlling the Bluetooth Headset Service via IPC.

Use BluetoothAdapter.getProfileProxy to get the BluetoothHeadset proxy object. Use BluetoothAdapter.closeProfileProxy to close the service connection.

Android only supports one connected Bluetooth Headset at a time. Each method is protected with its appropriate permission.

Summary

Constants
String	ACTION_AUDIO_STATE_CHANGED Intent used to broadcast the change in the Audio Connection state of the HFP profile.
String	ACTION_CONNECTION_STATE_CHANGED Intent used to broadcast the change in connection state of the Headset profile.
String	ACTION_VENDOR_SPECIFIC_HEADSET_EVENT Intent used to broadcast that the headset has posted a vendor-specific event.
int	AT_CMD_TYPE_ACTION AT command type ACTION used with EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE For example, AT+CHUP.
int	AT_CMD_TYPE_BASIC AT command type BASIC used with EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE For example, ATD.
int	AT_CMD_TYPE_READ AT command type READ used with EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE For example, AT+VGM?.
int	AT_CMD_TYPE_SET AT command type SET used with EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE For example, AT+VGM=.
int	AT_CMD_TYPE_TEST AT command type TEST used with EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE For example, AT+VGM=?.
String	EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_ARGS A Parcelable String array extra field in ACTION_VENDOR_SPECIFIC_HEADSET_EVENT intents that contains the arguments to the vendor-specific command.
String	EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD A String extra field in ACTION_VENDOR_SPECIFIC_HEADSET_EVENT intents that contains the name of the vendor-specific command.
String	EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE An int extra field in ACTION_VENDOR_SPECIFIC_HEADSET_EVENT intents that contains the AT command type of the vendor-specific command.
int	STATE_AUDIO_CONNECTED Headset state when SCO audio is connected.
int	STATE_AUDIO_CONNECTING Headset state when SCO audio is connecting.
int	STATE_AUDIO_DISCONNECTED Headset state when SCO audio is not connected.
String	VENDOR_RESULT_CODE_COMMAND_ANDROID A vendor-specific command for unsolicited result code.
String	VENDOR_SPECIFIC_HEADSET_EVENT_COMPANY_ID_CATEGORY The intent category to be used with ACTION_VENDOR_SPECIFIC_HEADSET_EVENT for the companyId

Inherited constants

From interface android.bluetooth.BluetoothProfile int A2DP A2DP profile. int CSIP_SET_COORDINATOR Coordinated Set Identification Profile set coordinator String EXTRA_PREVIOUS_STATE Extra for the connection state intents of the individual profiles. String EXTRA_STATE Extra for the connection state intents of the individual profiles. int GATT GATT int GATT_SERVER GATT_SERVER int HAP_CLIENT int HEADSET Headset and Handsfree profile int HEALTH This constant was deprecated in API level 29. Health Device Profile (HDP) and MCAP protocol are no longer used. New apps should use Bluetooth Low Energy based solutions such as BluetoothGatt, BluetoothAdapter.listenUsingL2capChannel(), or BluetoothDevice.createL2capChannel(int) int HEARING_AID Hearing Aid Device int HID_DEVICE HID Device int LE_AUDIO LE Audio Device int SAP SAP Profile int STATE_CONNECTED The profile is in connected state int STATE_CONNECTING The profile is in connecting state int STATE_DISCONNECTED The profile is in disconnected state int STATE_DISCONNECTING The profile is in disconnecting state

Public methods
List<BluetoothDevice>	getConnectedDevices() Get connected devices for this specific profile. For apps targeting Build.VERSION_CODES.S or or higher, this requires the Manifest.permission.BLUETOOTH_CONNECT permission which can be gained with Activity.requestPermissions(String[], int).
int	getConnectionState(BluetoothDevice device) Get the current connection state of the profile For apps targeting Build.VERSION_CODES.S or or higher, this requires the Manifest.permission.BLUETOOTH_CONNECT permission which can be gained with Activity.requestPermissions(String[], int).
List<BluetoothDevice>	getDevicesMatchingConnectionStates(int[] states) Get a list of devices that match any of the given connection states. For apps targeting Build.VERSION_CODES.S or or higher, this requires the Manifest.permission.BLUETOOTH_CONNECT permission which can be gained with Activity.requestPermissions(String[], int).
boolean	isAudioConnected(BluetoothDevice device) Check if Bluetooth SCO audio is connected.
boolean	isNoiseReductionSupported(BluetoothDevice device) Checks whether the headset supports some form of noise reduction For apps targeting Build.VERSION_CODES.R or lower, this requires the Manifest.permission.BLUETOOTH permission which can be gained with a simple <uses-permission> manifest tag.
boolean	isVoiceRecognitionSupported(BluetoothDevice device) Checks whether the headset supports voice recognition For apps targeting Build.VERSION_CODES.R or lower, this requires the Manifest.permission.BLUETOOTH permission which can be gained with a simple <uses-permission> manifest tag.
boolean	sendVendorSpecificResultCode(BluetoothDevice device, String command, String arg) Sends a vendor-specific unsolicited result code to the headset.
boolean	startVoiceRecognition(BluetoothDevice device) Start Bluetooth voice recognition.
boolean	stopVoiceRecognition(BluetoothDevice device) Stop Bluetooth Voice Recognition mode, and shut down the Bluetooth audio path.

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 timeoutMillis, int nanos) Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed. final void wait(long timeoutMillis) Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed. final void wait() Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
From interface android.bluetooth.BluetoothProfile abstract List<BluetoothDevice> getConnectedDevices() Get connected devices for this specific profile. abstract int getConnectionState(BluetoothDevice device) Get the current connection state of the profile abstract List<BluetoothDevice> getDevicesMatchingConnectionStates(int[] states) Get a list of devices that match any of the given connection states.

Constants

ACTION_AUDIO_STATE_CHANGED

Added in API level 11

public static final String ACTION_AUDIO_STATE_CHANGED

Intent used to broadcast the change in the Audio Connection state of the HFP profile.

This intent will have 3 extras:

• BluetoothProfile.EXTRA_STATE - The current state of the profile.
• BluetoothProfile.EXTRA_PREVIOUS_STATE- The previous state of the profile.
• BluetoothDevice.EXTRA_DEVICE - The remote device.

BluetoothProfile.EXTRA_STATE or BluetoothProfile.EXTRA_PREVIOUS_STATE can be any of STATE_AUDIO_CONNECTED, STATE_AUDIO_DISCONNECTED,
For apps targeting Build.VERSION_CODES.R or lower, this requires the Manifest.permission.BLUETOOTH permission which can be gained with a simple <uses-permission> manifest tag.
For apps targeting Build.VERSION_CODES.S or or higher, this requires the Manifest.permission.BLUETOOTH_CONNECT permission which can be gained with Activity.requestPermissions(String[], int).
Requires Manifest.permission.BLUETOOTH_CONNECT

Constant Value: "android.bluetooth.headset.profile.action.AUDIO_STATE_CHANGED"

ACTION_CONNECTION_STATE_CHANGED

Added in API level 11

public static final String ACTION_CONNECTION_STATE_CHANGED

Intent used to broadcast the change in connection state of the Headset profile.

This intent will have 3 extras:

• BluetoothProfile.EXTRA_STATE - The current state of the profile.
• BluetoothProfile.EXTRA_PREVIOUS_STATE- The previous state of the profile.
• BluetoothDevice.EXTRA_DEVICE - The remote device.

BluetoothProfile.EXTRA_STATE or BluetoothProfile.EXTRA_PREVIOUS_STATE can be any of BluetoothProfile.STATE_DISCONNECTED, BluetoothProfile.STATE_CONNECTING, BluetoothProfile.STATE_CONNECTED, BluetoothProfile.STATE_DISCONNECTING.
For apps targeting Build.VERSION_CODES.R or lower, this requires the Manifest.permission.BLUETOOTH permission which can be gained with a simple <uses-permission> manifest tag.
For apps targeting Build.VERSION_CODES.S or or higher, this requires the Manifest.permission.BLUETOOTH_CONNECT permission which can be gained with Activity.requestPermissions(String[], int).
Requires Manifest.permission.BLUETOOTH_CONNECT

Constant Value: "android.bluetooth.headset.profile.action.CONNECTION_STATE_CHANGED"

ACTION_VENDOR_SPECIFIC_HEADSET_EVENT

Added in API level 11

public static final String ACTION_VENDOR_SPECIFIC_HEADSET_EVENT

Intent used to broadcast that the headset has posted a vendor-specific event.

This intent will have 4 extras and 1 category.

• BluetoothDevice.EXTRA_DEVICE - The remote Bluetooth Device
• EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD - The vendor specific command
• EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE - The AT command type which can be one of AT_CMD_TYPE_READ, AT_CMD_TYPE_TEST, or AT_CMD_TYPE_SET, AT_CMD_TYPE_BASIC,AT_CMD_TYPE_ACTION.
• EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_ARGS - Command arguments.

The category is the Company ID of the vendor defining the vendor-specific command. BluetoothAssignedNumbers

For example, for Plantronics specific events Category will be VENDOR_SPECIFIC_HEADSET_EVENT_COMPANY_ID_CATEGORY.55

For example, an AT+XEVENT=foo,3 will get translated into

• EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD = +XEVENT
• EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE = AT_CMD_TYPE_SET
• EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_ARGS = foo, 3

For apps targeting Build.VERSION_CODES.R or lower, this requires the Manifest.permission.BLUETOOTH permission which can be gained with a simple <uses-permission> manifest tag.
For apps targeting Build.VERSION_CODES.S or or higher, this requires the Manifest.permission.BLUETOOTH_CONNECT permission which can be gained with Activity.requestPermissions(String[], int).
Requires Manifest.permission.BLUETOOTH_CONNECT

Constant Value: "android.bluetooth.headset.action.VENDOR_SPECIFIC_HEADSET_EVENT"

AT_CMD_TYPE_ACTION

Added in API level 11

public static final int AT_CMD_TYPE_ACTION

AT command type ACTION used with EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE For example, AT+CHUP. There are no arguments for action commands.

Constant Value: 4 (0x00000004)

AT_CMD_TYPE_BASIC

Added in API level 11

public static final int AT_CMD_TYPE_BASIC

AT command type BASIC used with EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE For example, ATD. Single character commands and everything following the character are arguments.

Constant Value: 3 (0x00000003)

AT_CMD_TYPE_READ

Added in API level 11

public static final int AT_CMD_TYPE_READ

AT command type READ used with EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE For example, AT+VGM?. There are no arguments for this command type.

Constant Value: 0 (0x00000000)

AT_CMD_TYPE_SET

Added in API level 11

public static final int AT_CMD_TYPE_SET

AT command type SET used with EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE For example, AT+VGM=.

Constant Value: 2 (0x00000002)

AT_CMD_TYPE_TEST

Added in API level 11

public static final int AT_CMD_TYPE_TEST

AT command type TEST used with EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE For example, AT+VGM=?. There are no arguments for this command type.

Constant Value: 1 (0x00000001)

EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_ARGS

Added in API level 11

public static final String EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_ARGS

A Parcelable String array extra field in ACTION_VENDOR_SPECIFIC_HEADSET_EVENT intents that contains the arguments to the vendor-specific command.

Constant Value: "android.bluetooth.headset.extra.VENDOR_SPECIFIC_HEADSET_EVENT_ARGS"

EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD

Added in API level 11

public static final String EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD

A String extra field in ACTION_VENDOR_SPECIFIC_HEADSET_EVENT intents that contains the name of the vendor-specific command.

Constant Value: "android.bluetooth.headset.extra.VENDOR_SPECIFIC_HEADSET_EVENT_CMD"

EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE

Added in API level 11

public static final String EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE

An int extra field in ACTION_VENDOR_SPECIFIC_HEADSET_EVENT intents that contains the AT command type of the vendor-specific command.

Constant Value: "android.bluetooth.headset.extra.VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE"

STATE_AUDIO_CONNECTED

Added in API level 11

public static final int STATE_AUDIO_CONNECTED

Headset state when SCO audio is connected. This state can be one of BluetoothProfile.EXTRA_STATE or BluetoothProfile.EXTRA_PREVIOUS_STATE of ACTION_AUDIO_STATE_CHANGED intent.

Constant Value: 12 (0x0000000c)

STATE_AUDIO_CONNECTING

Added in API level 11

public static final int STATE_AUDIO_CONNECTING

Headset state when SCO audio is connecting. This state can be one of BluetoothProfile.EXTRA_STATE or BluetoothProfile.EXTRA_PREVIOUS_STATE of ACTION_AUDIO_STATE_CHANGED intent.

Constant Value: 11 (0x0000000b)

STATE_AUDIO_DISCONNECTED

Added in API level 11

public static final int STATE_AUDIO_DISCONNECTED

Headset state when SCO audio is not connected. This state can be one of BluetoothProfile.EXTRA_STATE or BluetoothProfile.EXTRA_PREVIOUS_STATE of ACTION_AUDIO_STATE_CHANGED intent.

Constant Value: 10 (0x0000000a)

VENDOR_RESULT_CODE_COMMAND_ANDROID

Added in API level 19

public static final String VENDOR_RESULT_CODE_COMMAND_ANDROID

A vendor-specific command for unsolicited result code.

Constant Value: "+ANDROID"

VENDOR_SPECIFIC_HEADSET_EVENT_COMPANY_ID_CATEGORY

Added in API level 11

public static final String VENDOR_SPECIFIC_HEADSET_EVENT_COMPANY_ID_CATEGORY

The intent category to be used with ACTION_VENDOR_SPECIFIC_HEADSET_EVENT for the companyId

Constant Value: "android.bluetooth.headset.intent.category.companyid"

Public methods

getConnectedDevices

Added in API level 11

public List<BluetoothDevice> getConnectedDevices ()

Get connected devices for this specific profile.

Return the set of devices which are in state STATE_CONNECTED
For apps targeting Build.VERSION_CODES.S or or higher, this requires the Manifest.permission.BLUETOOTH_CONNECT permission which can be gained with Activity.requestPermissions(String[], int).
Requires Manifest.permission.BLUETOOTH_CONNECT

Returns
List<BluetoothDevice>	List of devices. The list will be empty on error.

getConnectionState

Added in API level 11

public int getConnectionState (BluetoothDevice device)

Get the current connection state of the profile
For apps targeting Build.VERSION_CODES.S or or higher, this requires the Manifest.permission.BLUETOOTH_CONNECT permission which can be gained with Activity.requestPermissions(String[], int).
Requires Manifest.permission.BLUETOOTH_CONNECT

Parameters
device	BluetoothDevice: Remote bluetooth device.

Returns
int	State of the profile connection. One of STATE_CONNECTED, STATE_CONNECTING, STATE_DISCONNECTED, STATE_DISCONNECTING Value is STATE_DISCONNECTED, STATE_CONNECTING, STATE_CONNECTED, or STATE_DISCONNECTING

getDevicesMatchingConnectionStates

Added in API level 11

public List<BluetoothDevice> getDevicesMatchingConnectionStates (int[] states)

Get a list of devices that match any of the given connection states.

If none of the devices match any of the given states, an empty list will be returned.
For apps targeting Build.VERSION_CODES.S or or higher, this requires the Manifest.permission.BLUETOOTH_CONNECT permission which can be gained with Activity.requestPermissions(String[], int).
Requires Manifest.permission.BLUETOOTH_CONNECT

Parameters
states	int: Array of states. States can be one of BluetoothProfile.STATE_CONNECTED, BluetoothProfile.STATE_CONNECTING, BluetoothProfile.STATE_DISCONNECTED, BluetoothProfile.STATE_DISCONNECTING,

Returns
List<BluetoothDevice>	List of devices. The list will be empty on error.

isAudioConnected

Added in API level 11

public boolean isAudioConnected (BluetoothDevice device)

Check if Bluetooth SCO audio is connected.
For apps targeting Build.VERSION_CODES.R or lower, this requires the Manifest.permission.BLUETOOTH permission which can be gained with a simple <uses-permission> manifest tag.
For apps targeting Build.VERSION_CODES.S or or higher, this requires the Manifest.permission.BLUETOOTH_CONNECT permission which can be gained with Activity.requestPermissions(String[], int).
Requires Manifest.permission.BLUETOOTH_CONNECT

Parameters
device	BluetoothDevice: Bluetooth headset

Returns
boolean	true if SCO is connected, false otherwise or on error

isNoiseReductionSupported

Added in API level 31

public boolean isNoiseReductionSupported (BluetoothDevice device)

Checks whether the headset supports some form of noise reduction
For apps targeting Build.VERSION_CODES.R or lower, this requires the Manifest.permission.BLUETOOTH permission which can be gained with a simple <uses-permission> manifest tag.
For apps targeting Build.VERSION_CODES.S or or higher, this requires the Manifest.permission.BLUETOOTH_CONNECT permission which can be gained with Activity.requestPermissions(String[], int).
Requires Manifest.permission.BLUETOOTH_CONNECT

Parameters
device	BluetoothDevice: Bluetooth device This value cannot be null.

Returns
boolean	true if echo cancellation and/or noise reduction is supported, false otherwise

isVoiceRecognitionSupported

Added in API level 31

public boolean isVoiceRecognitionSupported (BluetoothDevice device)

Checks whether the headset supports voice recognition
For apps targeting Build.VERSION_CODES.R or lower, this requires the Manifest.permission.BLUETOOTH permission which can be gained with a simple <uses-permission> manifest tag.
For apps targeting Build.VERSION_CODES.S or or higher, this requires the Manifest.permission.BLUETOOTH_CONNECT permission which can be gained with Activity.requestPermissions(String[], int).
Requires Manifest.permission.BLUETOOTH_CONNECT

Parameters
device	BluetoothDevice: Bluetooth device This value cannot be null.

Returns
boolean	true if voice recognition is supported, false otherwise

sendVendorSpecificResultCode

Added in API level 19

public boolean sendVendorSpecificResultCode (BluetoothDevice device, 
                String command, 
                String arg)

Sends a vendor-specific unsolicited result code to the headset.

The actual string to be sent is command + ": " + arg. For example, if command is VENDOR_RESULT_CODE_COMMAND_ANDROID and arg is "0", the string "+ANDROID: 0" will be sent.

Currently only VENDOR_RESULT_CODE_COMMAND_ANDROID is allowed as command.
For apps targeting Build.VERSION_CODES.R or lower, this requires the Manifest.permission.BLUETOOTH permission which can be gained with a simple <uses-permission> manifest tag.
For apps targeting Build.VERSION_CODES.S or or higher, this requires the Manifest.permission.BLUETOOTH_CONNECT permission which can be gained with Activity.requestPermissions(String[], int).
Requires Manifest.permission.BLUETOOTH_CONNECT

Parameters
device	BluetoothDevice: Bluetooth headset.
command	String: A vendor-specific command.
arg	String: The argument that will be attached to the command.

Returns
boolean	false if there is no headset connected, or if the command is not an allowed vendor-specific unsolicited result code, or on error. true otherwise.

Throws
IllegalArgumentException	if command is null.

startVoiceRecognition

Added in API level 11

public boolean startVoiceRecognition (BluetoothDevice device)

Start Bluetooth voice recognition. This methods sends the voice recognition AT command to the headset and establishes the audio connection.

Users can listen to ACTION_AUDIO_STATE_CHANGED. If this function returns true, this intent will be broadcasted with BluetoothProfile.EXTRA_STATE set to STATE_AUDIO_CONNECTING.

BluetoothProfile.EXTRA_STATE will transition from STATE_AUDIO_CONNECTING to STATE_AUDIO_CONNECTED when audio connection is established and to STATE_AUDIO_DISCONNECTED in case of failure to establish the audio connection.
For apps targeting Build.VERSION_CODES.R or lower, this requires the Manifest.permission.BLUETOOTH permission which can be gained with a simple <uses-permission> manifest tag.
For apps targeting Build.VERSION_CODES.S or or higher, this requires the Manifest.permission.BLUETOOTH_CONNECT permission which can be gained with Activity.requestPermissions(String[], int).
Requires Manifest.permission.BLUETOOTH_CONNECT

Parameters
device	BluetoothDevice: Bluetooth headset

Returns
boolean	false if there is no headset connected, or the connected headset doesn't support voice recognition, or voice recognition is already started, or audio channel is occupied, or on error, true otherwise

stopVoiceRecognition

Added in API level 11

public boolean stopVoiceRecognition (BluetoothDevice device)

Stop Bluetooth Voice Recognition mode, and shut down the Bluetooth audio path.

Users can listen to ACTION_AUDIO_STATE_CHANGED. If this function returns true, this intent will be broadcasted with BluetoothProfile.EXTRA_STATE set to STATE_AUDIO_DISCONNECTED.
For apps targeting Build.VERSION_CODES.R or lower, this requires the Manifest.permission.BLUETOOTH permission which can be gained with a simple <uses-permission> manifest tag.
For apps targeting Build.VERSION_CODES.S or or higher, this requires the Manifest.permission.BLUETOOTH_CONNECT permission which can be gained with Activity.requestPermissions(String[], int).
Requires Manifest.permission.BLUETOOTH_CONNECT

Parameters
device	BluetoothDevice: Bluetooth headset

Returns
boolean	false if there is no headset connected, or voice recognition has not started, or voice recognition has ended on this headset, or on error, true otherwise