BluetoothClass
public
final
class
BluetoothClass
extends Object
implements
Parcelable
| java.lang.Object | |
| ↳ | android.bluetooth.BluetoothClass |
Represents a Bluetooth class, which describes general characteristics and capabilities of a device. For example, a Bluetooth class will specify the general device type such as a phone, a computer, or headset, and whether it's capable of services such as audio or telephony.
Every Bluetooth class is composed of zero or more service classes, and exactly one device class. The device class is further broken down into major and minor device class components.
BluetoothClass is useful as a hint to roughly describe a device
(for example to show an icon in the UI), but does not reliably describe which
Bluetooth profiles or services are actually supported by a device. Accurate
service discovery is done through SDP requests, which are automatically
performed when creating an RFCOMM socket with BluetoothDevice.createRfcommSocketToServiceRecord(UUID) and BluetoothAdapter.listenUsingRfcommWithServiceRecord(String, UUID)
Use BluetoothDevice#getBluetoothClass to retrieve the class for
a remote device.
Summary
Nested classes | |
|---|---|
class |
BluetoothClass.Device
Defines all device class constants. |
class |
BluetoothClass.Service
Defines all service class constants. |
Constants | |
|---|---|
int |
PROFILE_A2DP
|
int |
PROFILE_HEADSET
|
int |
PROFILE_HID
|
Inherited constants |
|---|
Fields | |
|---|---|
public
static
final
Creator<BluetoothClass> |
CREATOR
|
Public methods | |
|---|---|
int
|
describeContents()
Describe the kinds of special objects contained in this Parcelable instance's marshaled representation. |
boolean
|
doesClassMatch(int profile)
Check class bits for possible bluetooth profile support. |
boolean
|
equals(Object o)
Indicates whether some other object is "equal to" this one. |
int
|
getDeviceClass()
Return the (major and minor) device class component of this
|
int
|
getMajorDeviceClass()
Return the major device class component of this |
boolean
|
hasService(int service)
Return true if the specified service class is supported by this
|
int
|
hashCode()
Returns a hash code value for the object. |
String
|
toString()
Returns a string representation of the object. |
void
|
writeToParcel(Parcel out, int flags)
Flatten this object in to a Parcel. |
Inherited methods | |
|---|---|
Constants
PROFILE_A2DP
public static final int PROFILE_A2DP
Constant Value: 1 (0x00000001)
PROFILE_HEADSET
public static final int PROFILE_HEADSET
Constant Value: 0 (0x00000000)
PROFILE_HID
public static final int PROFILE_HID
Constant Value: 3 (0x00000003)
Fields
Public methods
describeContents
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 |
doesClassMatch
public boolean doesClassMatch (int profile)
Check class bits for possible bluetooth profile support. This is a simple heuristic that tries to guess if a device with the given class bits might support specified profile. It is not accurate for all devices. It tries to err on the side of false positives.
| Parameters | |
|---|---|
profile |
int: the profile to be checked |
| Returns | |
|---|---|
boolean |
whether this device supports specified profile |
equals
public boolean equals (Object o)
Indicates whether some other object is "equal to" this one.
The equals method implements an equivalence relation
on non-null object references:
- It is reflexive: for any non-null reference value
x,x.equals(x)should returntrue. - It is symmetric: for any non-null reference values
xandy,x.equals(y)should returntrueif and only ify.equals(x)returnstrue. - It is transitive: for any non-null reference values
x,y, andz, ifx.equals(y)returnstrueandy.equals(z)returnstrue, thenx.equals(z)should returntrue. - It is consistent: for any non-null reference values
xandy, multiple invocations ofx.equals(y)consistently returntrueor consistently returnfalse, provided no information used inequalscomparisons on the objects is modified. - For any non-null reference value
x,x.equals(null)should returnfalse.
The equals method for class Object implements
the most discriminating possible equivalence relation on objects;
that is, for any non-null reference values x and
y, this method returns true if and only
if x and y refer to the same object
(x == y has the value true).
Note that it is generally necessary to override the hashCode
method whenever this method is overridden, so as to maintain the
general contract for the hashCode method, which states
that equal objects must have equal hash codes.
| Parameters | |
|---|---|
o |
Object: This value may be null. |
| Returns | |
|---|---|
boolean |
true if this object is the same as the obj
argument; false otherwise. |
getDeviceClass
public int getDeviceClass ()
Return the (major and minor) device class component of this
BluetoothClass.
Values returned from this function can be compared with the
public constants in BluetoothClass.Device to determine which
device class is encoded in this Bluetooth class.
| Returns | |
|---|---|
int |
device class component |
getMajorDeviceClass
public int getMajorDeviceClass ()
Return the major device class component of this BluetoothClass.
Values returned from this function can be compared with the
public constants in BluetoothClass.Device.Major to determine
which major class is encoded in this Bluetooth class.
| Returns | |
|---|---|
int |
major device class component |
hasService
public boolean hasService (int service)
Return true if the specified service class is supported by this
BluetoothClass.
Valid service classes are the public constants in
BluetoothClass.Service. For example, BluetoothClass.Service.AUDIO.
| Parameters | |
|---|---|
service |
int: valid service class |
| Returns | |
|---|---|
boolean |
true if the service class is supported |
hashCode
public int hashCode ()
Returns a hash code value for the object. This method is
supported for the benefit of hash tables such as those provided by
HashMap.
The general contract of hashCode is:
- Whenever it is invoked on the same object more than once during
an execution of a Java application, the
hashCodemethod must consistently return the same integer, provided no information used inequalscomparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application. - If two objects are equal according to the
equals(Object)method, then calling thehashCodemethod on each of the two objects must produce the same integer result. - It is not required that if two objects are unequal
according to the
equals(java.lang.Object)method, then calling thehashCodemethod on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.
As much as is reasonably practical, the hashCode method defined
by class Object does return distinct integers for
distinct objects. (The hashCode may or may not be implemented
as some function of an object's memory address at some point
in time.)
| Returns | |
|---|---|
int |
a hash code value for this object. |
toString
public String toString ()
Returns a string representation of the object. In general, the
toString method returns a string that
"textually represents" this object. The result should
be a concise but informative representation that is easy for a
person to read.
It is recommended that all subclasses override this method.
The toString method for class Object
returns a string consisting of the name of the class of which the
object is an instance, the at-sign character `@', and
the unsigned hexadecimal representation of the hash code of the
object. In other words, this method returns a string equal to the
value of:
getClass().getName() + '@' + Integer.toHexString(hashCode())
| Returns | |
|---|---|
String |
a string representation of the object. |
writeToParcel
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 |
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Last updated 2023-02-08 UTC.

