Added in API level 18

BluetoothGattDescriptor

Kotlin |Java

public class BluetoothGattDescriptor
extends Object implements Parcelable

java.lang.Object
↳	android.bluetooth.BluetoothGattDescriptor

Represents a Bluetooth GATT Descriptor

GATT Descriptors contain additional information and attributes of a GATT characteristic, BluetoothGattCharacteristic. They can be used to describe the characteristic's features or to control certain behaviours of the characteristic.

Summary

Constants
`int`	`PERMISSION_READ` Descriptor read permission
`int`	`PERMISSION_READ_ENCRYPTED` Descriptor permission: Allow encrypted read operations
`int`	`PERMISSION_READ_ENCRYPTED_MITM` Descriptor permission: Allow reading with person-in-the-middle protection
`int`	`PERMISSION_WRITE` Descriptor write permission
`int`	`PERMISSION_WRITE_ENCRYPTED` Descriptor permission: Allow encrypted writes
`int`	`PERMISSION_WRITE_ENCRYPTED_MITM` Descriptor permission: Allow encrypted writes with person-in-the-middle protection
`int`	`PERMISSION_WRITE_SIGNED` Descriptor permission: Allow signed write operations
`int`	`PERMISSION_WRITE_SIGNED_MITM` Descriptor permission: Allow signed write operations with person-in-the-middle protection

Inherited constants

From interface android.os.Parcelable

`int`	`CONTENTS_FILE_DESCRIPTOR` Descriptor bit used with `describeContents()`: indicates that the Parcelable object's flattened representation includes a file descriptor.
`int`	`PARCELABLE_WRITE_RETURN_VALUE` Flag for use with `writeToParcel(Parcel, int)`: the object being written is a return value, that is the result of a function such as "`Parcelable someFunction()`", "`void someFunction(out Parcelable)`", or "`void someFunction(inout Parcelable)`".

Fields
`public static final Creator<BluetoothGattDescriptor>`	`CREATOR`
`public static final byte[]`	`DISABLE_NOTIFICATION_VALUE` Value used to disable notifications or indicatinos
`public static final byte[]`	`ENABLE_INDICATION_VALUE` Value used to enable indication for a client configuration descriptor
`public static final byte[]`	`ENABLE_NOTIFICATION_VALUE` Value used to enable notification for a client configuration descriptor

Public constructors
`BluetoothGattDescriptor(UUID uuid, int permissions)` Create a new BluetoothGattDescriptor.

Public methods
`int`	`describeContents()` Describe the kinds of special objects contained in this Parcelable instance's marshaled representation.
`BluetoothGattCharacteristic`	`getCharacteristic()` Returns the characteristic this descriptor belongs to.
`int`	`getPermissions()` Returns the permissions for this descriptor.
`UUID`	`getUuid()` Returns the UUID of this descriptor.
`byte[]`	`getValue()` This method was deprecated in API level 33. Use `BluetoothGatt.readDescriptor(BluetoothGattDescriptor)` instead
`boolean`	`setValue(byte[] value)` This method was deprecated in API level 33. Pass the descriptor value directly into `BluetoothGatt.writeDescriptor(android.bluetooth.BluetoothGattDescriptor, byte[])`
`void`	`writeToParcel(Parcel out, int flags)` Flatten this object in to a Parcel.

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.os.Parcelable

`abstract int`	`describeContents()` Describe the kinds of special objects contained in this Parcelable instance's marshaled representation.
`abstract void`	`writeToParcel(Parcel dest, int flags)` Flatten this object in to a Parcel.

Constants

PERMISSION_READ

Added in API level 18

public static final int PERMISSION_READ

Descriptor read permission

Constant Value: 1 (0x00000001)

PERMISSION_READ_ENCRYPTED

Added in API level 18

public static final int PERMISSION_READ_ENCRYPTED

Descriptor permission: Allow encrypted read operations

Constant Value: 2 (0x00000002)

PERMISSION_READ_ENCRYPTED_MITM

Added in API level 18

public static final int PERMISSION_READ_ENCRYPTED_MITM

Descriptor permission: Allow reading with person-in-the-middle protection

Constant Value: 4 (0x00000004)

PERMISSION_WRITE

Added in API level 18

public static final int PERMISSION_WRITE

Descriptor write permission

Constant Value: 16 (0x00000010)

PERMISSION_WRITE_ENCRYPTED

Added in API level 18

public static final int PERMISSION_WRITE_ENCRYPTED

Descriptor permission: Allow encrypted writes

Constant Value: 32 (0x00000020)

PERMISSION_WRITE_ENCRYPTED_MITM

Added in API level 18

public static final int PERMISSION_WRITE_ENCRYPTED_MITM

Descriptor permission: Allow encrypted writes with person-in-the-middle protection

Constant Value: 64 (0x00000040)

PERMISSION_WRITE_SIGNED

Added in API level 18

public static final int PERMISSION_WRITE_SIGNED

Descriptor permission: Allow signed write operations

Constant Value: 128 (0x00000080)

PERMISSION_WRITE_SIGNED_MITM

Added in API level 18

public static final int PERMISSION_WRITE_SIGNED_MITM

Descriptor permission: Allow signed write operations with person-in-the-middle protection

Constant Value: 256 (0x00000100)

Fields

CREATOR

Added in API level 24

public static final Creator<BluetoothGattDescriptor> CREATOR

DISABLE_NOTIFICATION_VALUE

Added in API level 18

public static final byte[] DISABLE_NOTIFICATION_VALUE

Value used to disable notifications or indicatinos

ENABLE_INDICATION_VALUE

Added in API level 18

public static final byte[] ENABLE_INDICATION_VALUE

Value used to enable indication for a client configuration descriptor

ENABLE_NOTIFICATION_VALUE

Added in API level 18

public static final byte[] ENABLE_NOTIFICATION_VALUE

Value used to enable notification for a client configuration descriptor

Public constructors

BluetoothGattDescriptor

Added in API level 18

public BluetoothGattDescriptor (UUID uuid, 
                int permissions)

Create a new BluetoothGattDescriptor.

Parameters
`uuid`	`UUID`: The UUID for this descriptor
`permissions`	`int`: Permissions for this descriptor

Public methods

describeContents

Added in API level 24

public int describeContents ()

Describe the kinds of special objects contained in this Parcelable instance's marshaled representation. For example, if the object will include a file descriptor in the output of writeToParcel(android.os.Parcel, int), the return value of this method must include the CONTENTS_FILE_DESCRIPTOR bit.

Returns
`int`	a bitmask indicating the set of special object types marshaled by this Parcelable object instance. Value is either `0` or `CONTENTS_FILE_DESCRIPTOR`

getCharacteristic

Added in API level 18

public BluetoothGattCharacteristic getCharacteristic ()

Returns the characteristic this descriptor belongs to.

Returns
`BluetoothGattCharacteristic`	The characteristic.

getPermissions

Added in API level 18

public int getPermissions ()

Returns the permissions for this descriptor.

Returns
`int`	Permissions of this descriptor

getUuid

Added in API level 18

public UUID getUuid ()

Returns the UUID of this descriptor.

Returns
`UUID`	UUID of this descriptor

getValue

Added in API level 18
Deprecated in API level 33

public byte[] getValue ()

This method was deprecated in API level 33.
Use BluetoothGatt.readDescriptor(BluetoothGattDescriptor) instead

Returns the stored value for this descriptor

This function returns the stored value for this descriptor as retrieved by calling BluetoothGatt.readDescriptor(BluetoothGattDescriptor). The cached value of the descriptor is updated as a result of a descriptor read operation.

Returns
`byte[]`	Cached value of the descriptor

setValue

Added in API level 18
Deprecated in API level 33

public boolean setValue (byte[] value)

This method was deprecated in API level 33.
Pass the descriptor value directly into BluetoothGatt.writeDescriptor(android.bluetooth.BluetoothGattDescriptor, byte[])

Updates the locally stored value of this descriptor.

This function modifies the locally stored cached value of this descriptor. To send the value to the remote device, call BluetoothGatt.writeDescriptor to send the value to the remote device.

Parameters
`value`	`byte`: New value for this descriptor

Returns
`boolean`	true if the locally stored value has been set, false if the requested value could not be stored locally.

writeToParcel

Added in API level 24

public void writeToParcel (Parcel out, 
                int flags)

Flatten this object in to a Parcel.

Parameters
`out`	`Parcel`: The Parcel in which the object should be written. This value cannot be `null`.
`flags`	`int`: Additional flags about how the object should be written. May be 0 or `Parcelable.PARCELABLE_WRITE_RETURN_VALUE`. Value is either `0` or a combination of `Parcelable.PARCELABLE_WRITE_RETURN_VALUE`, and android.os.Parcelable.PARCELABLE_ELIDE_DUPLICATES